RUPAC2012 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
MOXCH02	Accelerators: Engines for Traversing a Large and Often Difficult Landscape	synchrotron, ion, laser, neutron	1
	A. Sessler LBNL, Berkeley, California, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-05CH11231. The many applications of accelerators are presented, with pictures and comments, upon the machines and the results obtained with them. Attention is then given to possible future applications, along with comments as to what is requited for these applications. Finally, some remarks are made as to what might be the future development of accelerators. In short, the presentation should serve as an introduction to the Conference itself where there shall be many – wonderfully detailed - contributions to all of this.
	Slides MOXCH02 [3.804 MB]

MOXCH04	Laser-Plasma Acceleration – Towards a Compact X-ray Light Source and FEL	laser, plasma, acceleration, FEL	9
	A. Seryi JAI, Oxford, United Kingdom
	Funding: The work is supported in part by UK STFC JAI grant ST/G008531. Advances in many scientific and technical fields depend on availability of instruments, which can probe the structure of materials or molecules on unprecedented levels of spatial or temporal resolution. Many of such instruments are based on accelerators of charged particles, with particular examples of synchrotron radiation light sources and coherent X-ray Free Electron Lasers. The high cost of such facilities, however, preclude wide spread of such instruments. Modern accelerator science witnesses emergence of a new direction – compact x-ray sources are coming to the scene, enabled by the synergy of accelerators and lasers, where high gradient laser-plasma acceleration can significantly reduce the size and cost of the facilities. Compact x-ray sources will be developed in the nearest future and will share their scientific and market niche with large national scale x-ray facilities. The compact sources will in particular be suitable for placement in universities and medical or technological centres. The compact x-ray light sources are being developed by many centres in UK. Development of compact x-ray FEL is a promising topic for scientific and technological collaboration between UK and Russia, where expertise of partners will cross-fertilize their ability to solve scientific and technological challenges.
	Slides MOXCH04 [12.555 MB]

MOYCH02	e⁺e⁻ Collider VEPP-4M: Status and Prospects	collider, target, luminosity, synchrotron	20
	E.B. Levichev BINP SB RAS, Novosibirsk, Russia
	In the paper we discuss recent results and prospects of VEPP-4M collider in the field of high energy physics. The experimental program in the low energy range (less than 2 GeV per beam) is almost completed and in future we are going to concentrate on beam energy increase. Also we describe the VEPP-4M features for other (non-HEP) experiments including synchrotron radiation, beam test facility, accelerator physics issues, etc.
	Slides MOYCH02 [2.707 MB]

MOZCH01	Beam Instability Phenomena Observed at HIRFL-CSR in the Presence of Electron Cooler	ion, injection, storage-ring, accumulation	33
	X.D. Yang, G.H. Li, J. Li, P. Li, X.M. Ma, R.S. Mao, T.L. Yan, J.C. Yang, Y.J. Yuan, T.C. Zhao IMP, Lanzhou, People's Republic of China L.J. Mao FZJ, Jülich, Germany
	Funding: Work supported by The National Natural Science Foundation of China, NSFC(Grant No. 10975166, 10905083) The 35kV and 300kV electron coolers of HIRFL-CSR have come into routine operation. Some signal samples acquired from BPM and Schottky probes during operation were presented in this paper, and they were observed in the different operation periods such as during injection, after cooling and cooling force measurement. These signals were considered related with the ion beam instability. The central frequency of ion beam varied with the time. Some were caused by the ripple of hardware, the other were created by ion beam itself. The reasons which caused these phenomena were analysed. The possible solutions were suggested, and some necessary upgrade and improvements were expected. These results were helpful to attempt the Schottky Mass Spectrometry measurement in the CSR.
	Slides MOZCH01 [5.663 MB]

TUXCH01	High Voltage Electron Cooler	high-voltage, solenoid, ion, proton	38
	V.V. Parkhomchuk, M.I. Bryzgunov, V.M. Panasyuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia A.V. Bubley BINP, Novosibirsk, Russia J. Dietrich, V. Kamerdzhiev FZJ, Jülich, Germany
	The results of commisioning with electron beam the high voltage electron cooler for COSY synchrotron will report.
	Slides TUXCH01 [4.239 MB]

TUXCH02	New Developments in High Energy Electron Cooling	high-voltage, laser, diagnostics, gun	43
	J. Dietrich DELTA, Dortmund, Germany
	Electron cooling of hadron beams is a powerful technique by which accelerator facilities achieve the necessary beam brightness for their physics research. An overview on the latest developments in high energy electron cooling (electron beam energy higher than 500 KeV) is given. Technical feasibility for electron beam energy up to 8 MeV is discussed.
	Slides TUXCH02 [3.122 MB]

TUXCH03	Approach to the Low Temperature State Oriented for Crystalline Beam	laser, ion, proton, synchrotron	48
	A. Noda, M. Nakao, H. Souda, H. Tongu Kyoto ICR, Uji, Kyoto, Japan M. Grieser MPI-K, Heidelberg, Germany Z.Q. He TUB, Beijing, People's Republic of China K. Jimbo Kyoto University, Institute for Advanced Energy, Kyoto, Japan I.N. Meshkov, A.V. Smirnov JINR, Dubna, Moscow Region, Russia K. Noda, T. Shirai NIRS, Chiba-shi, Japan H. Okamoto, K. Osaki HU/AdSM, Higashi-Hiroshima, Japan Y. Yuri JAEA/TARRI, Gunma-ken, Japan
	Funding: Work supported by Advanced Compact Accelerator Development of MEXT. It is also supported by GCOE project at Kyoto University, "The next generation of Physics-Spun from Universality and Emergence". With the use of S-LSR, an ion storage and cooler ring at ICR, Kyoto University, approach to attain the low temperature beam has been continued in these several years. Based on the realization of one dimensional ordered state of 7 MeV proton beam by an electron cooling, effort to reach lower temperature by laser cooling with much stronger cooling force, has been continued for 40 keV Mg ion beam. With the use of synchro-betatron resonance coupling(SBRC), longitudinal cooling effect can be well expected to be transferred to the transverse directions* and we have experimentally demonstrated of such effect**. The transverse cooling efficiency is, however, not so good deteriorated by intra-beam scattering (IBS) effect for the beam intensities higher than 10⁷. Although the reduction of the beam intensity keeping enough S/N ratio for observation of the beam, is not so easy, we are now challenging "controlled scraping", which controls the horizontal scraper position according to the extent of the indirect horizontal laser cooling by SBRC. In the present paper, our research stream from electron cooling to multi-dimensional laser cooling is surveyed at first and then challenge toward the crystalline beam is to be presented. : T. Shirai et al., Phys. Rev. Lett., Vol.98 (2007)204801. :H. Okamoto, A.M. Sessler and D. Möhl, Phys. Rev. Lett. Vol.72 (1994) 3977. *: M. Nakao et al., to be submitted to Phys. Rev. ST-AB.
	Slides TUXCH03 [8.557 MB]

TUYCH02	Beam Cooling at NICA Collider	ion, collider, accumulation, space-charge	53
	T. Katayama GSI, Darmstadt, Germany I.N. Meshkov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	At the NICA collider project it is planned to make collision of 24 short bunches, each containing around 10⁹ 197Au⁷⁹⁺ ions, at the two colliding points in the ring. The operation energy is envisaged from 1 GeV/u to 4.5 GeV/u. To prepare such beam conditions, the beam cooling technique, stochastic and electron beam, is employed at the beam accumulation from the injector Nuclotron and the following short bunch formation stage. Rather long pulse beam could be injected and accumulated in the collider with use of barrier voltage and beam cooling. After the enough beam accumulation, typically 2.4·10¹⁰, the high voltage RF with harmonic number 24 is applied to the accumulated coasting beam as well as the beam cooling which allow us to make the required short bunch of around 1nsec rms bunch length. The equilibrium condition is attained after 100~200 sec cooling, with the balance of RF force, cooling effects, IBS diffusion and the space charge repulsion force. In the present paper, detailed simulation results of beam accumulation and short bunch formation with stochastic cooling and electron cooling are presented including the space charge effects.
	Slides TUYCH02 [6.065 MB]

TUACH01	Status of the High Voltage Electron Cooler Project for NICA Collider	solenoid, high-voltage, acceleration, gun	58
	S. Yakovenko, E.V. Ahmanova, A. Ivanov, A.G. Kobets, I.N. Meshkov, A.Yu. Rudakov, A.V. Smirnov, N.D. Topilin JINR, Dubna, Moscow Region, Russia A.V. Shabunov JINR/VBLHEP, Moscow, Russia
	The electron cooling system at electron energy up to 2.5 MeV for the NICA collider is under design at JINR. The magnetic system and system of transfer of capacity on high potential is developed. The high voltage generator prototype on 250 kV was tested. The technical design of the electron cooling system was started.
	Slides TUACH01 [1.035 MB]

TUACH02	Long Term Beam Dynamics Simulation with the BETACOOL Code	ion, injection, simulation, collider	60
	A.V. Smirnov, A.O. Sidorin JINR, Dubna, Moscow Region, Russia
	General goal of the BETACOOL program is to simulate long term processes (in comparison with the ion revolution period) in the ion storage ring leading to variation of the ion distribution function in 6 dimensional phase space. The ion beam motion inside a storage ring is supposed to be stable and it is treated in linear approximation. Results of the numerical simulation of the beam dynamics for new projects FAIR (GSI, Germany) and NICA (JINR, Russia) are presented.
	Slides TUACH02 [1.004 MB]

TUZCH01	Current Plans for Beam Cooling at FAIR	antiproton, ion, target, storage-ring	63
	M. Steck GSI, Darmstadt, Germany
	In the new FAIR accelerator facility the production of intense secondary beams largely relies on beam cooling. The pre-cooling of secondary beams, either antiprotons or rare isotopes, is performed in the large acceptance Collector Ring (CR). A stochastic cooling system is under development which can be applied to both species, although they have different velocities. After transfer of the pre-cooled beams to the High Energy Storage Ring (HESR) stochastic and electron cooling will be available. In the HESR cooling allows accumulation of secondary beams, improvement of beam quality and luminosity for internal experiments and compensation of beam heating by the internal target. The proposed cooling procedures and the status of the beam cooling systems will be reviewed.
	Slides TUZCH01 [4.493 MB]

THXCH01	MARS: Fourth Generation X-Ray Light Source Based on Multiturn Energy-Recovery Linac	undulator, radiation, brightness, photon	123
	G.N. Kulipanov, Ya.V. Getmanov, O.A. Shevchenko, A.N. Skrinsky, N. Vinokurov BINP SB RAS, Novosibirsk, Russia V. Korchuganov RRC, Moscow, Russia M.V. Kovalchuk NRC, Moscow, Russia
	In the recent years, Russian government and scientific society have been coming gradually to an understanding the way of development science in Russia. Government have accepted a program of building six mega-science projects, and one of them can be a new 4-th generation x-ray light source based on accelerator-recuperator. Multiturn energy recovery linacs (ERL) looks very promising for making modern synchrotron radiation sources, being less expensive and more flexible. At this time only one multiturn ERL exists. This Novosibirsk ERL operates with two orbits and two free electron lasers based on one linac now. The conception of Multiturn Accelerator-recuperator Radiation Source (MARS) was proposed in 1997 by G.N. Kulipanov, A.N. Skrinsky and N.A. Vinokurov. The use of the ERL with two separated accelerating structures allows to exclude main disadvantages of scheme with one linac, such as the pass of electron bunches with different energies through the same magnetic arcs. The feasibility study for such ERL-based high brightness x-ray source is presented.
	Slides THXCH01 [2.385 MB]

THXCH02	The Development of Synchrotron Radiation Source of NRC "Kurchatov Institute"	wiggler, controls, storage-ring, synchrotron	126
	V. Korchuganov, A. Belkov, Y.A. Fomin, E.V. Kaportsev, G.A. Kovachev, M.V. Kovalchuk, Y.V. Krylov, K. Kuznetsov, V.V. Kvardakov, V.V. Leonov, V.I. Moiseev, V.P. Moryakov, K. Moseev, N.I. Moseiko, D.G. Odintsov, S.G. Pesterev, Yu.F. Tarasov, S.I. Tomin, V. Ushkov, A.G. Valentinov, A. Vernov, Y.L. Yupinov, A.V. Zabelin NRC, Moscow, Russia
	Russia's first dedicated SR source based on electron storage ring Siberia-2 entered service in late 1999, Kurchatov Institute, Moscow. The report focuses on the consumer parameters of an electron beam and the further development of actual SR source, SR beam lines and experimental stations in 2012.
	Slides THXCH02 [5.459 MB]

THXCH03	Current FEL Physics Research at SLAC	FEL, laser, undulator, radiation	131
	G.V. Stupakov SLAC, Menlo Park, California, USA
	Funding: Work is supported by Department of Energy contract DE-AC02-76SF00515 SLAC is a home of the first hard x-ray free electron laser - the Linac Coherent Light Source, or LCLS, based on Self-Amplified Stimulated Emission (SASE) principle. Being a user facility, LCLS, as well as some other installations at SLAC, are, at the same time, test beds of research aimed to improving fundamental characteristics of free electron lasers. In this presentation I will review results of some of these studies. They include studies of the FEL seeding based on the Echo-Enabled Harmonic Generation (EEGH) carried out at the NLCTA facility at SLAC, hard x-ray self seeding at LCLS, noise suppression experiments, and research aimed to achieve terawatt-scale power in FELs. A brief review of the plans for LCLS upgrade will be given.
	Slides THXCH03 [10.105 MB]

THXCH04	Budker INP Free Electron Laser Facility – Current Status and Future Prospects	FEL, undulator, radiation, linac	136
	O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, E.I. Gorniker, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, L.A. Mironenko, V.K. Ovchar, B.Z. Persov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, G.V. Serdobintsev, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, N. Vinokurov, M.G. Vlasenko, P. Vobly, V. Volkov BINP SB RAS, Novosibirsk, Russia
	The free electron laser (FEL) facility at Budker INP is being developed for more than 15 years. It is based on the normal conducting CW energy recovery linac (ERL) with rather complicated magnetic system lattice. Up to now it is the only one in the world multiorbit ERL. It can operate in three different regimes providing electron beam for three different FELs. Its commissioning was naturally divided in three stages. The first stage ERL includes only one orbit placed in vertical plane. It serves as electron beam source for terahertz FEL which started working for users in 2003. Radiation of this FEL is used by several groups of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized in experiments on material ablation and biological objects modification. The second stage ERL is composed of two orbits located in horizontal plane. The second stage FEL is installed on the bypass of the second orbit. The first lasing of this FEL was achieved in 2009. The last stage ERL will include four orbits. Its commissioning is in progress now. In this paper we report the latest results obtained from the operating FELs as well as our progress with the commissioning of the two remaining ERL beamlines. We also discuss possible options for the future upgrade.
	Slides THXCH04 [5.360 MB]

THBOR03	A Possibility of High-Energy Bremsstrahlung Dosimetry by Indium Activation	target, simulation, radiation, photon	155
	V.L. Uvarov, A.N. Dovbnya, V.V. Mytrochenko, V.I. Nikiforov, S.A. Perezhogin, Yu.V. Rogov, V.A. Shevchenko, I.N. Shlyakhov, B.I. Shramenko, A.Eh. Tenishev, A.V. Torgovkin NSC/KIPT, Kharkov, Ukraine
	Development of a number of promising photonuclear technologies is connected with the use of bremsstrahlung sources having end-point energy up to 100 MeV and average radiation power of tens kW. Commonly, such sources are created on the basis of high-current electron linacs. A possibility of bremsstrahlung dosimetry by means of activation of a target from indium of natural composition and absorbed dose determination through the specific activity of the 115mIn isomer is reported. Preliminary study of isomer photoactivation as well as the yield of reference reactions from simultaneously irradiated natural molybdenum was conducted by simulation technique. Joint measurement of the 115mIn, 90Mo, 99Mo activity and absorbed dose in the PMMA standard dosimeters were carried out at LU-10 and LU-40 linacs of NSC KIPT in the electron energy range 8…70 MeV. It was found that, within the range of study, the ratio of the 115mIn specific activity to absorbed dose in the PMMA slightly depends on the bremsstrahlung end-point energy.
	Slides THBOR03 [0.553 MB]

THBCH02	Beam Extraction System for Industrial Electron Accelerator ILU-14	extraction, vacuum, radiation, controls	161
	V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, E.N. Kokin, V.M. Radchenko, E.A. Shtarklev, A. YU. Vlasov BINP SB RAS, Novosibirsk, Russia
	This paper describes beam extraction system for pulse linear electron accelerator ILU-14 with energy range 7.5-10 MeV and beam power up to 100 kW. The main aim of this work was to achieve the uniform dose field in radiation zone. Admissible dose nonuniformity is of no more than ± 5% along the scanning length up to 1 m (if necessary, the scanning length may be reduced). Geometrical and electron-optical characteristics of all the beam channel elements were optimized after computer simulation of electron trajectories. To achieve the required nonuniformity of dose field additional electromagnets were installed. These magnets realize beam focusing and centering of the beam endwise of the channel, as well as correction of the scanning field. Control system of magnets power supply allows the online correction of electron beam.
	Slides THBCH02 [0.403 MB]

THCCH02	Characteristics of the Model of Linear Accelerator Based on Parallel Coupled Accelerating Structure with Beam Loading	beam-loading, cavity, injection, gun	164
	Y.D. Chernousov ICKC, Novosibirsk, Russia A.M. Barnyakov, A.E. Levichev, V.M. Pavlov BINP SB RAS, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	The 5-cavity model of linear accelerator based on the parallel coupled accelerating structure (LAPCAS) is under study. Linear accelerator is equipped with focusing system based on permanent magnet and three-electrode gun with RF control. The work of accelerator with electron beam is demonstrated. The parameters of short pulses mode are following: electron energy - 4 MeV, pulse current - 0.3 A, pulse duration - 2.5 ns; the parameters of long pulses mode are following: energy - 2.5 MeV, pulse current - 0. 1A, pulse duration - 0.1 - 4 us. Working frequency of the accelerator is 2.45 GHz. In RF-controlled mode the capture of about 100% is demonstrated. The beam loading effect is observed. The compensation of energy spread of accelerated electrons by delaying the moment of injection in the LAPCAS is demonstrated. The equations of transient process in the accelerating cavity which is powered by an external RF generator and excited by electron bunches in a simple form are presented.
	Slides THCCH02 [1.154 MB]

FRXCH01	NIIEFA Accelerators for Industry and Medicine	radiation, cyclotron, neutron, high-voltage	167
	M.F. Vorogushin NIIEFA, St. Petersburg, Russia
	The D.V. Efremov Institute (NIIEFA) is one of the leading enterprises in Russia involved in designing and manufacturing of applied charged particle accelerators as well as electrophysical systems based on these accelerators. Since the foundation of the Institute, we have designed, manufactured and delivered to Russian customers and abroad more than three hundred accelerators for diverse applications, in particular, cyclotrons, linear electron accelerators, high-voltage accelerators and neutron generators. The activities of the Institute in the field of accelerating engineering encompasses all the stages of an accelerator manufacturing, starting from R&D works to manufacturing, installation and maintenance of the delivered equipment. The Institute is granted the license and the International Certificate for the Quality Management System based on the International Standard ISO 9001 for designing, development, production, installation and maintenance of charged particle accelerators. Nowadays, there are the following most promising fields of application of the accelerators designed and manufactured in NIIEFA, namely: nuclear medicine, radiotherapy and neutron therapy, non-destructive inspection, activation analysis, electron-beam sterilization, radiation processing in industry and environmental protection.
	Slides FRXCH01 [2.865 MB]

FRXCH05	Irradiation Facilities and Complexes of INRP RFNC-VNIIEF	radiation, neutron, target, cathode	176
	N.V. Zavyalov, V.F. Basmanov, A.A. Devyatkin, V.S. Gordeev, S.A. Gornostay-Polsky, A.V. Grishin, A.V. Grunin, V.F. Kolesov, G.A. Myskov, S.T. Nazarenko, V.T. Punin, V.A. Savchenko, A.V. Telnov, S. Vorintsov VNIIEF, Sarov (Nizhnii Gorod), Russia
	The given review presents installations produced and applied at the Nuclear Radiation Research Institute (NRRI) of RFNC – VNIIEF to simulate under laboratory conditions the effects of nuclear explosion and space ionizing radiation on the special-purpose installations. Available is a brief description of the installation itself and characteristics of different-type electron accelerators and two irradiation complexes PUL'SAR and LIU-10M-GIR2 created on the base of high-current linear induction electron accelerators and pulsed nuclear reactors. There are considered electron accelerators GAMMA and BETA-8 that are being created at present.

FRXOR01	Technique and Instrumentation For Bunch Shape Measurements	target, linac, electromagnetic-fields, ion	181
	A. Feschenko RAS/INR, Moscow, Russia
	Bunch shape is one of the most important, interesting but difficult to observe characteristics of a beam in ion linear accelerators. Different possibilities of bunch shape measurements are considered but the emphasis is put on the Bunch Shape Monitors (BSM) developed in INR RAS. The operation of BSM is based on a coherent transformation of a longitudinal structure of a beam under study into a spatial distribution of a secondary electron beam through rf scanning. BSM characteristics found both by simulations and experimentally are presented; the ultimate parameters and the limitations are discussed. Modifications of BSM are described. Some experimental results of bunch observations are demonstrated.
	Slides FRXOR01 [6.339 MB]

FRACH04	Acceleration Technique Developed at JINR for Hadron Therapy	ion, cyclotron, extraction, proton	194
	E. Syresin JINR, Dubna, Moscow Region, Russia
	The JINR activities are aimed on the construction of accelerators for proton and carbon ion therapy. JINR-IBA have developed and constructed the proton cyclotron C235-V3. The cyclotron will be delivered in the first Russian hospital center of the proton therapy in Dimitrovgrad in 2012. The project of the medical carbon synchrotron was developed in JINR. The project goal is accumulation of the superconducting Nuclotron technology at construction of the carbon synchrotron. Accelerated 12C ion beams are effectively used for cancer treatment. The PET is the most effective way of tumor diagnostics. The intensive radioactive 11C ion beam could allow both these advantages to be combined. JINR-NIRS collaboration develops formation of a primary radioactive ion beam at intensity on the tumor target of 10⁸ pps for the scanning radiation. A superconducting cyclotron C400 has been designed by the IBA-JINR collaboration. This cyclotron will be used for radiotherapy with proton, helium and carbon ions. Its construction was started in 2010 within the framework of the Archarde project (France). The interaction between delta electrons and DNA molecules is one of the important processes in the hadron therapy. The formation of low energy electrons and DNA ions are presented for the KEK electrostatic storage ring with the electron target developed by JINR-NIRS collaboration.
	Slides FRACH04 [2.934 MB]

FRYOR02	Status Report on Physics Research and Technology Developments of Electron String Ion Sources of Multicharged Ions	ion, ion-source, injection, solenoid	208
	E.E. Donets, D.E. Donets, E.D. Donets, S.V. Gudkov, A.Yu. Ramsdorf, V.V. Salnikov, V.B. Shutov JINR, Dubna, Moscow Region, Russia
	Electron String Ion Source (ESIS) "Krion-2" (JINR) is the first and now only ion source of such type in the world. ESIS is a sophisticated modification of Electron Beam Ion Source (EBIS) working in a reflex mode of operation under very specific conditions. The main results, which were achieved during recent years are: Au⁵⁴⁺ ion beams with intensity 5x10⁷ particle per pulse were first produced, ion-ion cooling technology was demonstrated to prove its efficiency for a thermal ion loss reduction and Krion-2 was used for production and injection of Xe⁴²⁺ ion beam into LINAC injector of JINR synchrotron Nuclotron, where the beam was first accelerated to relativistic energy in March 2010 [1-3]. At the present time an essential progress was achieved in construction of the new 6 Tesla ESIS, which is expected to be the full scale prototype of a highly charged ion source for NICA - the new JINR accelerator complex. It is foreseen in the NICA project that new ESIS will provide Au³²⁺ beams with ion yield about 2x10⁹ ppp. However, a project parameters of new Krion-6T ion source allow to expect production of even more highly charged states of heavy elements, up to Au⁶⁹⁺ in terms of gold. In this case new Krion-6T ESIS is planned to be used on operating JINR "Nuclotron" facility in near future for experiments with an extracted accelerated gold ion beams on a fixed target. [1] D.E. Donets, et all, 2010 JINST 5 C09001; http://iopscience.iop.org/1748-0221/5/09/C09001. [2] D.E. Donets, et all, RSI 80, 063304 (2009). **[3] D.E. Donets, et all, RSI 83, 02A512 (2012).

FRBOR03	Non-gated Field Emission Array as Low-Energy Electron Source: Experiment and Simulation	cathode, vacuum, high-voltage, simulation	218
	K.A. Nikiforov, L.I. Antonova, N.V. Egorov, V.V. Trofimov St. Petersburg State University, St. Petersburg, Russia
	A non-gated NbN on Si wafer field emission arrays are studied. The I-V measurements and emission characteristics of edge-shaped cathodes in atmosphere low-voltage regime are considered. Mathematical and computer models are presented. The current density obtained from experiment was up to 384 Ampere per square centimeter in emission area 9 sq.mm. Low-voltage regime (20 V) for near (~ 1mkm) interelectrode distance in diode configuration is discussed.

FRBCH03	High Voltage ELV Accelerators for Industrial Application (Family of Accelerators and Tendency of Development)	ion, extraction, vacuum, high-voltage	227
	B.S. Han, W.G. Kang, S.M. Kim EB TECH Co. Ltd., Daejeon, Republic of Korea N.K. Kuksanov, R.A. Salimov BINP SB RAS, Novosibirsk, Russia
	Due to the necessity of pilot scale test facility for continuous treatment of wastewater and gases on the spot, a mobile electron beam irradiation system mounted on a trailer has developed in EB TECH Co. Ltd. and Budker Institute of Nuclear Physics. This mobile electron beam irradiation system is designed for the individual field application with self-shielded structure of steel plate and lead block which will satisfy the required safety figures of ICRP. Design parameters are limited by the allowable total weight and height of the trailer on the road which controlled by National Authorities. Therefore, the output parameter of electron beam is designed for 0.7 MeV and 20 kW through 600 mm window. Shielding of a mobile electron accelerator has been examined by Monte Carlo technique (MCNP code). Calculations using two different versions (version 4c2 and version 5) of MCNP showed agreements within statistical uncertainties, and the highest leakage is far below the tolerable radiation dose limit. This mobile unit will be used for on-site test of liquid waste and gaseous waste in Saudi Arabia by Saudi ARAMCO and U.S.A. by PELE Technology Inc. together with EB TECH Co. Ltd. This unit could treat up to 500m3 of liquid waste per day or 10,000 Nm3 of gases per day.
	Slides FRBCH03 [11.807 MB]

MOPPA001	Excitation of the Focusing Wakefields by a Relativistic Bunch in Isotropic Capillary Discharge Plasma	plasma, focusing, wakefield, vacuum	242
	R.R. Kniaziev, G.V. Sotnikov NSC/KIPT, Kharkov, Ukraine
	At present work excitation of wakefields by an relativistic electron bunch in a capillary tube filled with plasma is investigated. In the approximation of constant velocity of the bunches an analytical expressions for a components of an electromagnetic field are found. Numerical calculations of excited capillary tubes fields fabricated from the alumina and the quartz is carried out. Outer diameter of a capillary tube is equal 1 mm, inner diameter is 0.4 mm. In the absence of plasma in such structure the wakefields of the THz frequencies range are excited. Longitudinal and transverse profiles of wake fields in slow wave structure which drive channel is filled with plasma are investigated in details. These profiles allow to investigate dependences of wakefields from plasma density, the sizes of dielectric structure and/or the linear sizes of an electron bunch. When comparison of these dependences, it follows that there are longitudinal positions of the test bunch relative to the drive bunch, which can provide high-gradient acceleration of charged particles and their simultaneous radial focusing.

MOPPA002	Nonlinear Theory of Excitation of an Axially Asymmetric Wakefield in Dielectric Resonator	wakefield, electromagnetic-fields, vacuum, acceleration	245
	K.V. Galaydych, G.V. Sotnikov NSC/KIPT, Kharkov, Ukraine
	A nonlinear self-consistent theory of excitation of an axially asymmetric wakefield by relativistic electron bunches in cylindrical dielectric resonator with a vacuum channel for the charged particles transportation through the resonator is constructed. An excited fields are presented in the form of superposition solenoidal and potential fields. The solenoidal electromagnetic fields are presented by an expansion of the required fields into solenoidal fields of the empty dielectric resonator. The potential field is presented by the eigenfunction expansion method. The dispersion equation for determination of eigenfrequencies and the equation for eigenvalues are obtained, eigenwaves, eigenfunctions and their norms are found. For an excited fields the analytical expressions, that take into account both longitudinal and transverse dynamics of bunch particles are derived. Along with the equations of motion they provide a self-consistent description of the dynamics of generated fields and bunches. The formulated nonlinear theory allows investigating numerically the nonlinear effects such as increasing of the transverse bunch size, and head-tail beam breakup instability, which occurs if the electron bunch in the structure is misaligned.

MOPPA004	Energy Spread Decreasing in Linear Mode Operating Laser Plasma Wakefield Accelerator	plasma, laser, acceleration, bunching	251
	S.M. Polozov MEPhI, Moscow, Russia
	Laser plasma wakefield acceleration (LPWA)* is one of most popular novel methods of acceleration. The LPWA is very perceptively because the accelerating gradient in plasma channel can be a number of orders larger than in metal structures. But the LPWA has two serous disadvantages as very high energy spread and low part of electrons trapped into acceleration. The energy spectrum better than 10% does not observed anyone in simulations or experiments. It should be noted that the electron's beam dynamics in LPWA is different for underdense plasma (quasi linear mode) and in for dense plasma (non-linear and bubble modes). Non-linear mode is studying more intensive at present and methods of the energy spread decrease are under development ,. But the linear LPWA mode also has interest for practical use. The rate of energy gain is very high in the linear mode also and compact laboratory scale facility could be designed to accelerate the electron beam up to a hundreds MeV. Bunching before injection into plasma channel will discuss to decrease the energy spread and to enlarge the electron trapping efficiency. T. Tajima, J.M. Dowson. Phys. Rev. Lett., 1979, v. 43, 4, 267. S.V. Bulanovet al. Physics of Plasmas, 2008, 15, 073111. * E.Esarey et al. Phys. Rev. Lett., 1997, 79, 2682.

MOPPA005	Laser-Wakefield Acceleration with External Bunch Injection at REGAE	plasma, laser, emittance, injection	254
	J. Grebenyuk, K. Flöttmann DESY, Hamburg, Germany T. Mehrling, J. Osterhoff Uni HH, Hamburg, Germany
	Funding: Helmholtz Alliance Short and highly intense laser pulses focused into a gas target, ionise the gas and may excite large amplitude plasma waves that support extreme electric fields (>10 GV/m) for acceleration of charged particles. The REGAE facility at DESY, which provides 2-5 MeV of ~10 fs bunches, offers the unique possibility to study the external injection of pre-accelerated electron bunches from a conventional accelerator, and their subsequent acceleration in plasma wakefields. Simulations were performed with the particle-in-cell code OSIRIS, showing a wide variety of effects which can be explored in the future at REGAE. External controlled injection allows to study effects which require precise information about the beam quality, position and momentum at the initial point of injection. Topics of a particular interest are: bunch emittance growth suppression, controlled betatron motion, and longitudinal bunch compression.

MOPPA007	Wakefield Produced by a Small Bunch Moving in Cold Magnetized Plasma Along the External Magnetic Field	plasma, wakefield, acceleration, electromagnetic-fields	257
	S.N. Galyamin, D.Y. Kapshtan, A.V. Tyukhtin Saint-Petersburg State University, Saint-Petersburg, Russia
	Funding: The Dmitry Zimin "Dynasty" Foundation and Russian Foundation for Basic Research (Grant No. 12-02-31258). Plasma wakefield acceleration (PWFA) is a promising tool for acceleration of charged particles to high energies at relatively small lengths. Knowledge about the structure of the electromagnetic field produced by the driver bunch in plasma plays the essential role for the realization of this accelerating scheme. Constant external magnetic field which can be used for focusing the driver bunch affects the field structure essentially because plasma acquires both anisotropy and gyrotropy. However, the electromagnetic field in the latter case has not been practically investigated until present. Here we study the field produced by point charge and small bunch moving in cold magnetized plasma along the external magnetic field. We note the singular behavior of some components of the wave field produced by point charge near the charge trajectory. We also analyze the influence of the external magnetic field and bunch size on the field components.

MOPPA008	Parameter Optimization of a Rectangular Dielectric Based Wakefield Accelerating Structure	wakefield, vacuum, accelerating-gradient, radiation	260
	S. Baturin, A. Altmark, I.L. Sheynman LETI, Saint-Petersburg, Russia A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio, USA
	With this talk, we present the algorithm and simulation results of the wakefield parametric study of the rectangular dielectric based wakefield accelerating structure. Analytical solution of the wakefield generation in the rectangular dielectric structure has been considered to achieve optimal relations between both the geometrical parameters and dielectric constant of the structure, and the beam parameters like bunch charge and bunch length. Optimization has been carried out for maximization of the accelerating gradient at the single LSM11 mode approximation.

MOPPA009	An Analytical Approach to Solution of Self-coordinated Beam Dynamics in Dielectric Wakefield Accelerating Structures	wakefield, focusing, acceleration, radiation	263
	I.L. Sheynman LETI, Saint-Petersburg, Russia
	Self-coordinated transverse dynamics of the high current relativistic electronic bunches used for generation of wake fields in wakefield accelerating structures with dielectric filling is investigated. An analytical approach to solution of self-coordinated beam dynamics is developed.

MOPPA010	Numerical and Analytical Methods of Modeling of Bunch Dynamics in Dielectric Filled Accelerating Structures	wakefield, radiation, acceleration, free-electron-laser	266
	I.L. Sheynman LETI, Saint-Petersburg, Russia A. Kanareykin Euclid TechLabs, LLC, Solon, Ohio, USA
	RF waveguide structures are a basis for development of new generation of accelerators on the basis of a wakefield method of the charged particle acceleration, and also free electron lasers. Numerical and analytical calculation methods of Vavilov-Cherenkov radiation generated by relativistic electronic bunches in wave guides with dielectric filling, and also self-coordinated bunch dynamics in own and external fields are considered.

MOPPA016	Dynamics of 197Au⁷⁸⁺ Ions Generated in Recombination with Cooling Electrons in the NICA Collider	ion, synchrotron, collider, vacuum	275
	A.V. Eliseev JINR, Dubna, Moscow Region, Russia O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	Ions 197Au⁷⁸⁺ are generated in recombination of original bare nuclei 197Au⁷⁹⁺ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au⁷⁸⁺ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au⁷⁸⁺ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au⁷⁷⁺ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.

MOPPA018	Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure	cavity, coupling, acceleration, collider	281
	Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov BINP SB RAS, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

MOPPA019	RF Antenna Lead	high-voltage, radiation, simulation, cavity	284
	A.M. Barnyakov, A.E. Levichev BINP SB RAS, Novosibirsk, Russia Y.D. Chernousov ICKC, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	RF antenna lead is described. This lead is used for RF power input to high voltage electrodes. The device consists of receiving and transmitting antennas realized as symmetrical parts of coaxial cavity with dielectric disk between the parts. Main operating characteristics are the following: high voltage is over 60 kV, coefficient of transmission at the operating frequency is over 0.97, bandpass is over 70% (at the level of -3dB). The scheme of the device, principle of work and measured results are presented.

MOPPA030	X-ray Radiation High-Voltage Elements of the Tandem Accelerator With Vacuum Insulation	radiation, vacuum, high-voltage, neutron	299
	I.N. Sorokin, A.G. Bashkirtsev, V.Ya. Chudaev, A.A. Ivanov, D.A. Kasatov, A.S. Kuznetsov, S.Yu. Taskaev BINP SB RAS, Novosibirsk, Russia
	In Institute of Nuclear Physics SB RAS the epithermal neutron source is entered into operation based on the tandem – accelerator with vacuum isolation. It was evaluated the accelerating installation components of a X-ray field causing dark current and breakdowns in accelerating gaps. The estimated account of equivalent doze capacity on different distances from the accelerator in the protected hall and behind its limits is made. The experimental measurements were carried out and the study results of the doze capacity dynamics are submitted, depending on change of a dark current in tandem accelerating gaps at a complete working voltage 1 MV without a beam. The spectrum of X-ray radiation is experimentally measured. It is experimentally revealed and the occurrence of powerful X-ray radiation is investigated at substantial growth of the aperture of the accelerating channel. Are offered and the changes of a design of installation for prevention of occurrence of powerful X-ray radiation are realized. The carried out research allows setting necessary parameters for designing medical installation on the basis of an accelerator - tandem with vacuum isolation with the purpose of realization in oncological clinics neutron-capture therapy of malignant tumours.

TUPPB002	Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider	ion, collider, luminosity, vacuum	307
	A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	On the basis of experimental data the production of the ions Au⁷⁸⁺ and Au⁷⁷⁺ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au⁷⁸⁺ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.

TUPPB005	LEPTA Project: Towards Positronium	positron, focusing, gun, injection	316
	A.G. Kobets, E.V. Ahmanova, V.I. Lokhmatov, I.N. Meshkov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region, Russia M.K. Eseev NAFU, Arkhangelsk, Russia
	The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron coolin system. The project positron energy is of 2 – 10 keV. The main goal of the facility is to generate an intense flux of positronium atoms – the bound state of electron and positron. Storage ring of LEPTA facility was commissioned in September 2004 and was under development up to now. The positron injector has been constructed in 2005 - 2010, and beam transfer channel – in 2011. By the end of August 2011 experiments on electron and positron injection into the ring have been started. The recent results are presented here.

TUPPB009	RF Self–Consistent Electron Beam Dynamics Simulation in THz Generator Based on Photoinjector and Cherenkov Decelerating System	radiation, simulation, beam-loading, acceleration	328
	T.V. Bondarenko, S.M. Polozov, O.A. Tatsyuk MEPhI, Moscow, Russia
	The generator of high intensity monochromatic radiation in sub-mm band is currently under R&D at the Department of Electrophysical Facilities of MEPhI. This generator is based on photoinjector and irradiating Cherenkov capillary. It is necessary to have high brightness electron beams to generate of monochromatic radiation in this type of structure. These beams can be produced by photocathode and accelerated to energy of several MeV using short structure having high rate of energy gain. Irradiating capillary represents metal tube having inner radius of the radiation wavelength order and covered with dielectric layer or made of corrugated waveguide. It's important to study the self-consistent dynamics of the beam during the acceleration as the pulse current is equal several A, i.e. the beam dynamics should be studied taking into account RF (radiation) field and Coulomb field of self space charge. Another task is to study the electron beam dynamics and fields irradiated by it in decelerating structure in the absence of external fields. The scheme of the facility, its operation mode and high-current beam dynamics simulation results in accelerating and irradiating structures are presented.

TUPPB013	Dependence on Betatron Oscillations of the Angular Velocity	radiation, synchrotron, synchrotron-radiation, quadrupole	340
	O.E. Shishanin MSIU, Moscow, Russia
	An examination of this topic among other factors is necessary to an understanding of the role of electron vibrations at the formation of synchrotron radiation. Mentioned problem was resolved by author in various periodic magnetic fields. Influence on radiation of the correction terms to the angular velocity for storage rings is also discussed.

TUPPB014	Cooling of Electron Beams	synchrotron, radiation, storage-ring, cyclotron	342
	V.M. Khoruzhiy NSC/KIPT, Kharkov, Ukraine
	Cooling of electron beams (transversal velocities reducing) in storage rings (cyclic accelerators) may be realized using gyromonotron device as part of storage ring at straight-line portion. The gyromonotron is a HF oscillator for cm and mm band of wavelength in which electron beam with nonzero transversal velocities is used for excitation electromagnetic wave. Energy of transversal motion of electron beam converts into energy of electromagnetic wave during multiple passing the same bunches with repetition frequency f0 through gyromonotron. We choose frequency f0 (and corresponding wavelength AL) as minimal frequency (H111 mode) for gyromonotron's resonator. As well known, frequency f0 of H111 mode gives possibility to determine radius of the resonator R~AL/(21.71). We assumed above that resonator's length L/(2R)>1. It is possible for gyromonotron's solenoid to determine longitudinal magnetic field Hz(kOE)=11/AL(cm) for low relativistic beam's energy. For gyromonotron's operation at given frequency it's needed realization of condition for relativistic cyclotron frequency Om_rel/(23.14)~ f0. Emitted beam radiation dissipates inside gyromonotron’s resonator (output window is absent). Q-quality gyromonotron’s resonator and pitch factor PF of electron beam have to satisfy condition Q PF>1 (for "warm" or superconducting (SC) resonators).

TUPPB015	The Parameters Extracted Beams in Recirculator SALO	dipole, quadrupole, recirculation, extraction	344
	I.S. Guk, S.G. Kononenko, F.A. Peev, A.S. Tarasenko NSC/KIPT, Kharkov, Ukraine
	Taking into account the nonlinearity of the dipole and quadrupole lenses are calculated beam parameters on the output channels of the recirculator SALO.

TUPPB025	Investigation of Program and Perturbed Motions of Particles in Linear Accelerator	controls, rfq, resonance, simulation	367
	I.D. Rubtsova, E.N. Suddenko St. Petersburg State University, St. Petersburg, Russia
	Beam control model for program and perturbed motions with interaction account is realized. Quality functional gradient is obtained.

TUPPB030	Computer Simulation of the Electron Beam Energy Spectrum Measurement by the Magnetic Analyzer Method Based on Scanning System of the Sterilization Installation	induction, acceleration, radiation, simulation	382
	P.A. Bystrov, M.A. Alekseev, N.E. Rozanov MRTI RAS, Moscow, Russia
	A method for measuring the characteristic, which makes possible to find the energy spectrum of the electron beam of the accelerator is described. This method uses the magnetic analyzer, which is based on the scanning system of the standing wave linear electron accelerator, mounted on the radiation sterilizer. This characteristic is the dependence of beam current, that reaches the induction sensor at the accelerator output window, on the magnetic field, deflecting the beam from the axis of the system. The results of the measurements of these characteristic, which were performed on the sterilization installation in MRTI, are presented. The computer simulation of electron beam dynamics in the scanning system for the case of these experiments was performed with the help of developed program "BEAM SCANNING". The similar dependence of the beam current on the magnetic field was obtained. The necessity of taking into account the effect of electron reflection from the walls of vacuum chamber is stated. To describe this effect the additional features were implemented in the program. As a result of calculations with the account of this effect, the correspondence of the calculated curve and experimental one was reached. This means that the calculated spectrum corresponds to the actual energy spectrum of the electron beam in the experiment.

TUPPB031	Measurement of Beam Parameters in the VEPP-5 Damping Ring Using Betatron Oscillations Decoherence	damping, betatron, positron, synchrotron	385
	A.V. Petrenko, K.V. Astrelina BINP SB RAS, Novosibirsk, Russia
	Funding: RFBR, grant N 09-02-00594-а The measurement of beam parameters during the commissioning of VEPP-5 Damping Ring is presented. Coherent betatron oscillations of the 380-MeV electron beam were induced by a fast kick. Electrostatic beam position monitors were used to obtain the turn-by-turn transverse beam position data. The form and behaviour of the envelope of oscillations are determined by the beam parameters, chromaticity and nonlinear detuning. Beam emittance and energy spread values have been obtained from the analysis of the beam envelope, nonlinear detuning and chromaticity measurements. The results are in a good agreement with theoretical predictions which were made for calibrated model of the Damping Ring. Independent analysis of betatron spectra envelope have been performed for energy spread measurements as well.

TUPPB033	Simplified Beam Line with Space Charge Compensation of Low Energy Ion Beam	ion, space-charge, ion-source, plasma	388
	A.V. Dudnikov BINP SB RAS, Novosibirsk, Russia
	Simplified beam line for low energy Ion implantation is considered. Compensation of the space charge of high perveance, low energy ion beam in beam lines for ion implantation and isotope separation has been investigated. Space charge compensation and overcompensation by ions will be considered. Different mechanisms of the compensating particle formation such as ionization by the beam, secondary emission of electrons and negative ions, electronegative gas admixture, and external plasma sources will be discussed. Advanced space charge compensation increases an intensity of low energy ion beam after analyzer magnet up to 3–4 times. Space charge compensation of positive ion beam by admixture of electronegative gases and damping of the beam instability will be discussed. Up to 6 mA of 11B+ ions with energy 3 keV, 11 mA with 5 keV, and 18 mA with 10 keV have been transported through an analyzer magnet of a high current implanter with space charge compensation by electronegative gases

TUPPB034	Low Energy Cooler for NICA Booster	gun, ion, booster, cathode	391
	A.V. Bubley, M.I. Bryzgunov, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva BINP SB RAS, Novosibirsk, Russia
	Low energy cooler for NICA project is being currently designed at BINP in collaboration with JINR. From the point of view of its features it is similar to previous low energy coolers manufactured at BINP, i.e. equipped with variable electron beam, electrostatic bending, high precision solenoid etc. The article describes some technical solutions applied to the cooler design.

TUPPB039	The Motion of Ionic Flux in an Electron Layer	ion, plasma, extraction, vacuum	403
	A.S. Chikhachev, Y.A. Kovalenko Allrussian Electrotechnical Institute, Moskow, Russia
	Processes of ion extraction from plasma are very important for experiment. This process is studied in a lot of theoretical works. In work * was shown that ions leave plasma with velocities, exceeding ion-sound velocity. In real conditions when electron temperature exceeds the ion temperature, quantity ions accelerated is exponentially small. In work was shown that transition layer in system "plasma-vacuum" are infinitely great. In * equilibrium states with nonzero flow of electrons are studied, where electrons and ions have the same drift direction. In presented work equilibrium states are studied when nonzero electron flow has drift direction perpendicular to ion drift direction. States were examined with finite thickness and in condition of electrons, occupying half of the layer. * K.-U.Riemann, J.Phys. D, 1991, 24, 493. N.Sternberg, V.Godyak, IEEE Plasma Sc., 35, 2007, 1341. * Yu.A.Kovalenko, T.V.Chernyshev, A.S.Chikhachev, Izv. RAN, "Energetika", 2011, 4, 24.

TUPPB040	Angiography X-ray Monochromatic Source Based on Radiation From Crystals	radiation, photon, scattering, laser	406
	T.V. Bondarenko, G.B. Sharkov Siemens LLC, Moscow, Russia Y.A. Bashmakov LPI, Moscow, Russia S.M. Polozov MEPhI, Moscow, Russia
	Nowadays angiography has become one of the most commonly used medical procedures. However the X-ray tubes are mostly used in angiography imaging systems. The problem that encounters in using X-ray tubes is low monochromaticity due to bremsstrahlung while angiography imaging requires quasimonochromatic energy spectrum for better image quality and lower dose rate obtained by the patient. The use of the monocrystaline target at the medical electron LINAC can be one of the possible ways to obtain the monochromatic X-ray radiation. This type of X-ray generator will provide monochromatic radiation with photon energy dependent on the electron beam energy. The X-ray generation mechanism, possibilities of monocrystal usage as an X-ray source for angiography and requirements for beam parameters are discussed.

TUPPB043	Program Complex for Vacuum Nanoelectronics Finite Element Simulations	simulation, cathode, vacuum, gun	409
	K.A. Nikiforov, N.V. Egorov St. Petersburg State University, St. Petersburg, Russia
	The program complex in MATLAB intended for vacuum nanoelectronics simulations is described. Physical and mathematical models, computational methods and algorithms of program complex are presented. Electrostatic simulation of electron transport processes is discussed under electron massless approximation; current function method and Matlab PDE Toolbox finite element solutions are used. Developed program complex is able to simulate diode and triode structures with complicated submicron geometry, current-voltage characteristics, calculate electric field distribution, estimate electric line interaction. The modelling results by the example of two different triode structures are presented. Matlab stand-alone application with graphical user interface for demonstration purposes is presented.

TUPPB045	The Field Cathodes with the Effect of Space Charge Modeling	space-charge, cathode, vacuum, brightness	415
	M.A. Makarova, E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia
	This work is devoted to the question of the effect of space charge on the field electron emission. The electrostatic potential distributions for the diode emission systems are calculated. The diode systems, which can be readily constructed, is generally used for the characterization of field emission properties of novel materials. They have some effective applications in vacuum nano- and microelectronics. In this work the plane diode emission system and cylindrical diode emission system are investigated. The solutions of Poisson's equation for the electrostatic potential distribution are received for the boundary-value problems. The right side of Poisson's equation is assumed to be the piecewise constant function. The charge conservation law and the energy conservation law are used. One and two dimensional cases are investigated.

TUPPB047	The Triode-type System on the Basis of the Field Emitter Modeling	cathode, controls, vacuum, ion-source	418
	D.S. Televnyi St. Petersburg State University, St. Petersburg, Russia E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia
	The mathematical model of a cylindrical triode-type system on the basis of the field emitter is under consideration. The internal area of the system is filled of two different dielectrics. Effect of space charge is not considered. The field emitter is modeled by a charged filament of finite length, which located on the system's axis. The modulator has a form of a circular diaphragm. The Poisson equation with the given values of potentials at the electrodes is solved. The variable separation method is used to determine distribution of electrostatic potential. An unknown function of the charge density is approximated by a piecewise constant linear function. The problem of finding unknown coefficients in the potential eigenfunction expansion is reduced to the linear algebraic equations system. Numerical calculations emitter's forms are represented.

TUPPB048	The Multi-Tip Field Emission Cathode Mathematical Modeling	cathode, lattice, vacuum, space-charge	421
	N.V. Egorov, E.M. Vinogradova Saint-Petersburg State University, Saint-Petersburg, Russia
	The multi-tip field cathode as the field emission cathode arrays for rectangular lattice is considered. The field emission cathodes are of interest for vacuum nano-scale electronic devices. The electrostatic potential distribution is presented for the periodic system of free-number thin tips on a plane substrate as a field emission cathode and a plane substrate as an anode. The tips shape may be various. The potential of the substrate and cathode is equal the zero, the anode's potential is equal a constant. The effect of space charge is neglected. The each tip is represented as a system of the point charges. The point charges are determined to the zero equipotential coincides with the cathode's shape. The potential distribution is found for whole region of the field emission cathode arrays. The exact three-dimensional solution to the Laplace/Poisson equation has been obtained in the Cartesian coordinate system. This solution has direct applications in three-dimensional calculations of electron trajectories in micron- and submicron-sized field-emitter arrays.

TUPPB049	First Test Results of RF Gun for the Race-track Microtron Recuperator of BINP SB RAS	cavity, vacuum, gun, microtron	424
	V. Volkov, V.S. Arbuzov, E.I. Gorniker, E.I. Kolobanov, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, V.N. Osipov, V.M. Petrov, A.M. Pilan, M.A. Scheglov, I.K. Sedlyarov, N. Vinokurov BINP SB RAS, Novosibirsk, Russia
	A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration.

TUPPB050	The System of Power Supplies, Control and Modulation of Electron Gun for Free Electron Laser	controls, cathode, FEL, free-electron-laser	427
	V.K. Ovchar, V.R. Kozak, E.A. Kuper, V.R. Mamkin, V.V. Repkov, S.S. Serednyakov, S.V. Tararyshkin, D.A. Zverev BINP SB RAS, Novosibirsk, Russia
	The system of power supplies, control and modulation based on triode cathode-grid unit was designed for producing of pulsed electron beam for free electron laser FEL The main part of the system located inside the tank filled with SF6 gas and has -300 kV potential. It's supplied through the isolated transformer and controlled through the fiber optic link with CAN interface. The GaN RF transistor in the output stage of modulator composed of hybrid assembly on the BeO ceramic plate. Pulsed output voltage of modulator can be regulated 0-120 V on the load 25 Ohm. Time duration is <1 ns. Repetition rate is 0-90 MHz. Start of modulator from timer performed through the 1GHz fiber optic link. The control code was written on C++ language under Windows operating system using QT framework.

TUPPB052	A ps-Pulsed E-gun Advanced to a T-wave Source of MW-level Peak Power	laser, FEL, cathode, radiation	430
	A.V. Smirnov RadiaBeam, Santa Monica, USA
	Funding: Department of Energy A coherent source based on a electron gun is considered to deliver high instantaneous power comparable to that available from just a few other non-FEL and most FEL sources at mm-submillimeter wavelengths. A DC or RF E-gun is integrated with a robust, compact, efficient, dismountable radiator inside the vacuum envelope. Wakefield radiator is driven by a low-energy photoinjector operated in a custom mode combining strong over-focusing, robust slow-wave structure, and pulse sub-ps photoinjectior employing on-cathode beam modulation with conventional optical multiplexing. Single pulse mode operation is enhanced with filed compression effect at high group velocity. The performance is analyzed analytically and numerically supported by experimental data on beam overfocusing. Radiation outcoupling is analyzed as well.

TUPPB053	High Duty Cycle Ion Sources at GSI and FAIR	ion, ion-source, ECRIS, plasma	433
	J. Pfister, A. Adonin, W.A. Barth, R. Hollinger, K. Tinschert GSI, Darmstadt, Germany
	Future heavy ion experiments at GSI and FAIR demand for high current as well as highly brilliant ion beams of various metallic and gaseous ions produced by the GSI accelerator facility. Therefore GSI's Ion Source Group is developing and operating various types of ion sources feeding the linac at 2.2keV/u with a maximum mass-over-charge ratio of 65. In this contribution a status overview of operated high duty cycle ion sources including important ion source data as beam current, beam spectrum, transverse emittance, duty factor and transmission along the LEBT as well as future perspectives for the ion source operation for FAIR is presented.

TUPPB058	Improving Efficiency of Plasma Generation in H⁻ Ion Source with Saddle Antenna	plasma, ion, ion-source, gun	439
	V.G. Dudnikov, R.P. Johnson Muons, Inc, Batavia, USA S.N. Murray, T.R. Pennisi, M.F. Piller, M. Santana, M.P. Stockli, R.F. Welton ORNL, Oak Ridge, Tennessee, USA
	Funding: Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690. Progress in development of RF ion source with saddle radio frequency (SA) (RF) antenna which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability is considered. Several versions of new plasma generators with different antennas and magnetic field configurations were tested in the Test Stand. The efficiency of positive ion plasma generation has been improved ~4x times up to 0.18 A/cm² per 1 kW of RF power 13.56 MHz. A new version of the RF assisted triggering plasma source (TPS) has been designed, fabricated and tested. A Saddle antenna SPS with water cooling is being fabricated for high duty factor have been tested.

WEPPC004	Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency	cavity, radiation, linac, coupling	453
	S. Proskin, A. Kulago MEPhI, Moscow, Russia
	A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC005	Extreme Density Charge Electron Bunches	target, linac, radiation, controls	456
	S. Proskin, A. Kulago MEPhI, Moscow, Russia
	This paper presents untraditional approach for obtaining the DLWG limited bunch charge (LBC). The maximum energy of accelerated bunch is considered. As a result the bremsstrahlung maximum dose rate evaluation is obtained

WEPPC028	High Voltage Terminal in COSY Electron Cooler	controls, high-voltage, power-supply, gun	503
	V.A. Chekavinskiy, E.A. Bekhtenev, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, E.A. Kuper, V.R. Mamkin, A.S. Medvedko, D.N. Pureskin, D.V. Senkov, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia
	In Budker INP SBRAS was developed electron cooler with energy up to 2MeV for COSY accelerator (Germany). Due to restricted footprint, cooler's collector and gun parts were combined in a single acceleration system – high voltage terminal. All power and control electronics were placed in a single isolated volume, filled with SF6 gas under 4-6 atm. pressure. Electronics is controlled via wireless CAN, and powered by multistage transformer, capable of 15 kW power at 26 kHz. Wireless control is passed through dedicated optically transparent window, also served for modulated laser beam, used in electron beam diagnostic. By construction, electronics is divided on two standalone units: collector power supply and gun-filter system (SGF). SGF is built on 19" EuroPak chassis, where were placed all power modules, needed for collector and gun pipe electrodes. All power outputs were protected against overvoltage and sparks, available while cooler exploitation. In SGF there were controlled up to 40 parameters altogether. SGF inner power supply provides stable operation in wide range of input voltage, up to ±50% from nominal. Also included in SGF are 2 auxiliary systems, used for beam guiding and beam diagnostics.

WEPPC032	The Power Supply System for the Accelerating Column of the 2 MeV Electron Cooler for COSY	high-voltage, solenoid, power-supply, controls	512
	D.N. Skorobogatov, M.I. Bryzgunov, A.D. Goncharov, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, A.S. Medvedko, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov BINP SB RAS, Novosibirsk, Russia
	The electron cooler of a 2 MEV for COSY storage ring FZJ is assembling in BINP. The high energy electron beam produced by the electrostatic accelerating column. The power supply for accelerating column of the electron cooling system consists of 33 distributed by the accelerating potential controlled modules. Each module has precision controlled voltage source 60 kV 1mA, and additional supply for the magnetic system solenoid with a maximal current of 2.5 amperes. All the system controlled through wireless ZIGBEE network. The report presents the structure of the power system, its parameters and the results of tests carried out in BINP.

WEPPC042	Design Parameters of Biperiodic Accelerating Structure for Medical Linac with Widely Variable Energy	injection, coupling, simulation, medical-accelerators	529
	Yu. Zuev, M.A. Kalinichenko, V.V. Terentiev NIIEFA, St. Petersburg, Russia
	Results on the simulation of beam dynamics in an accelerating structure with regulation of particle energy from 6 to 21 MeV are presented. The structure operates in the standing wave mode, consists of two weakly coupled substructures and resonates at closed frequencies f1 , f2. In-phased electromagnetic field oscillations take place in the substructures at frequency f1, whereas anti-phased oscillations occur at frequency f2. Main features of the accelerating structure are electronic control of the beam energy and possibility to form narrow energy spread at both frequencies.

WEPPC044	Positron Annihilation Spectroscopy at LEPTA Facility	positron, background, vacuum, lattice	532
	P. Horodek, I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region, Russia
	The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*10⁷ s⁻¹ at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.

WEPPC046	RF Photoinjector Parameters Optimization	coupling, vacuum, impedance, radiation	535
	T.V. Bondarenko, S.M. Polozov MEPhI, Moscow, Russia
	Sources of high-power electromagnetic radiation in THz band are becoming promising as a new method of a low activation introscopy. Research and development of accelerating RF photoinjector for THz source are reported. The photoinjector is based on disk loaded waveguide (DLW). Photoinjector consists of two accelerating structures: widespread 1.6 cell DLW structure and travelling wave resonator structure based on 8 cells traveling wave accelerating structure. The resonant models of these structures and the structures with power ports were designed. Electrodynamics characteristics and electric field distribution for all models were acquired. Electrodynamics models were tuned to the resonant frequency of 3000 MHz. Magnetic field coupling between cells of accelerating structure and optimization of the diaphragms sizes were analyzed to enlarge the structures efficiency. Diaphragms windows profiles were optimized to decrease the overvoltage on the windows edges and to eliminate the breakdown possibility.

WEPPC048	Status of 1 MeV 25 kW CW Electron Accelerator	klystron, gun, vacuum, high-voltage	541
	D.S. Yurov MSU SINP, Moscow, Russia A.S. Alimov, B.S. Ishkanov, N.I. Pakhomov, V.P. Sakharov, V.I. Shvedunov MSU, Moscow, Russia
	Status of 1 MeV 25 kW continuous wave (CW) linear electron accelerator for radiation technologies which is under construction at SINP MSU is described. Driven by 50 kW CW klystron on-axis coupled standing wave accelerating structure was optimized, manufactured and tuned. The results of accelerating structure measurements and tuning are presented. RF system, high voltage, vacuum and control systems of the accelerator are described. New magnetic system forming output beam irradiation field is also described.

WEPPC052	Beam Scanning System of Linear Accelerator for Radiation Processing	extraction, controls, beam-losses, vacuum	547
	M.I. Demsky, V.V. Krotov, D.E. Trifonov CORAD Ltd., St. Petersburg, Russia
	The report represents a beam scanning system for irradiation of opposite sides of the boxes during one pass. This beam scanning system contains the well-known scanning system composed of scanning magnet and vacuum chamber with the beam extraction window covered by titanium foil. The bending magnet, which is located on the edge of this vacuum chamber, turns the electron beam to the metallic pipe, connected with the vacuum chamber. The metallic pipe goes sideways from the irradiated boxes and is connected with the second vacuum chamber, located inside of a 180 degrees bending magnet. Electrons are turning on 180 degrees and scanning along the opposite side of the boxes due to the hyperbolic shape of the current in a coil of the 180 degrees bending magnet. Therefore, electrons are scanning along one side of the box, then round the box sideway through the metallic pipe and scanning along the opposite side of this box after turning 180 degrees. The full cycle of the scanning can be repeated up to 6 times per second. The experimental results of this system operation with 10 MeV, 12 kW electron beam are given in this report.

WEPPC053	The IDK-6/9MeV Linear Electron Accelerator and its Application in the Customs Inspection System	controls, cathode, interlocks, radiation	549
	V.P. Malyshev, B.O. Bolshakov, P.O. Klinovskiy, K.V. Kotenko, A.V. Sidorov, V. Smekalkin NIIEFA, St. Petersburg, Russia
	A linear electron accelerator IDK-6/9МeV has been designed for operation as a source of ionizing radiation in a customs inspection system intended for inspection of large-scale cargos. The main operating mode of the accelerator is the X-ray mode with an energy of 6 MeV, which ensures the penetrability (for steel) more than 300 mm. The operating mode of the accelerator can be quickly changed for 9 Mev, which allows the objects under study to be discriminated based on the organics/non-organics criterion using the "two energies" method. A triode electron source with cathode and grid modulators is applied in the accelerator. A system of collimators located at the output of the accelerating device ensures shaping of an X-ray beam fan-shaped in the vertical plane with an opening angle of 460 directed towards the detector line. The accelerator is equipped with a computerized system of protective interlocks and control, which makes possible its operation both in the setting mode and as a component of the whole customs inspection system.

WEPPC054	Updating of the "Electron-3M2" Accelerator in the Line for Radiation Curing of Polymer Coatings	radiation, shielding, extraction, high-voltage	551
	V.P. Ovchinnikov, O.V. Borisov, I.V. Druzgalckiy, V.V. Koltsov, V.P. Maznev, A.I. Seleznev, M.P. Svinin NIIEFA, St. Petersburg, Russia
	In 2008-2009, NIIEFA specialists performed works on updating the "ELECTRON-3M" accelerator previously delivered to FSUE "Admiralty Shipyards" to be operated on the line for radiation curing of polymer coatings. After obtaining nominal parameters on the updated accelerator "ELECTRON-3M2", the intensity of bremsstrahlung radiation on the surface of the accelerator shielding was measured; the obtained data confirmed the machine compliance with corresponding norms and regulation documents. Measurements of parameters of the accelerator electron radiation field have demonstrated that the uniformity coefficient of the beam current linear density is 5%, and the symmetry coefficient amounts to 1%. The beam current and accelerating voltage instability during one hour of operation does not exceed 1%. After the updating, the lifetime of the accelerator will be not less than 10 years.

WEPPC056	Improving of Uniformity of the Electron-Beam Treatment of Materials by ELV Accelerators	radiation, controls, scattering, focusing	557
	D.A. Kogut, S. Fadeev, N.K. Kuksanov BINP SB RAS, Novosibirsk, Russia
	The problem of the absorbed dose distribution during the EB treatment by ELV accelerator is considered. The value of the absorbed dose is determined by the speed of scanning electron beam along the accelerator exit window (i.e. the movement across the conveyor). It is determined both by the shape of scanning current and by the geometry of scanning magnets. A simple way to improve the dose distribution near the edges of the extraction device of accelerator is suggested. It allows to provide the non-uniformity less 4%.

WEPPC059	Electron Beam Image Visual Monitoring	monitoring, target, linac, gun	563
	V.N. Boriskin, I.A. Chertishchev, N.G. Reshetnyak, K. Romanovsky, V.A. Shevchenko, I.N. Shlyakhov, A.Eh. Tenishev, V.L. Uvarov, V. Zakutin NSC/KIPT, Kharkov, Ukraine
	The system for visual monitoring of the electron beam features was developed and implemented. This system is based on registration of optical radiation, which is generated under object-beam interaction. The system comprises image transferring channel, remote-controlled digital photo-camera, connected with PC by USB-interface as well as proper software. The images obtained give information on the beam density distribution over the surface of the object being irradiated. 100 KeV and 10 MeV electron beams was researched.

WEPPD002	Simulations and Design of THz Wiggler for 15-40 MeV FEL	wiggler, simulation, radiation, power-supply	569
	E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov JINR, Dubna, Moscow Region, Russia
	The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm². The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 10² mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.

WEPPD003	Diagnostic Technique with Femtosecond Resolution Applied for FEL Electron Bunches	radiation, undulator, photon, FEL	572
	E. Syresin, A.Yu. Grebentsov, R.S. Makarov, N.A. Morozov, M.V. Yurkov JINR, Dubna, Moscow Region, Russia O.I. Brovko, A.V. Shabunov JINR/VBLHEP, Moscow, Russia
	Diagnostic technique applied for FEL ultrashort electron bunches is developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort electron bunches are based on calorimetric measurements and detection of undulator radiation. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The pump probe experiments with VUV and FIR undulators provide the bunch profile measurements with resolution of several femtosecond. The MCP based radiation detectors are effectively used at FLASH for VUV pulse energy measurements. The new three MCP detectors operated in X-ray range are under development now in JINR for SASE1-SASE 3 XFEL.

WEPPD004	Longitudinal Stability of ERL with Two Accelerating RF Structures	linac, RF-structure, cavity, simulation	575
	Ya.V. Getmanov, O.A. Shevchenko BINP SB RAS, Novosibirsk, Russia N. Vinokurov KAERI, Daejon, Republic of Korea
	Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper

WEPPD009	Measurement of Speed of Light Emitted by Ultrarelativistic Source	radiation, synchrotron, synchrotron-radiation, cavity	584
	A. Stirin, P. Aleksandrov, V. Korchuganov NRC, Moscow, Russia E.B. Aleksandrov IOFFE, St. Petersburg, Russia V.S. Zapasskii Saint-Petersburg State University, Saint-Petersburg, Russia
	Funding: The work was supported by the Russian Fundation for Basic Research under Project No.11-02-00538-а. The paper focuses on the results of experiments on direct measurement of speed of the light emitted by an ultrarelativistic source. The source of synchrotron radiation (SR), Siberia-1 electron storage ring at Kurchatov Institute, was used as a pulsed source of light. Experiments were made on the visible part of the SR emitted by ultrarelativistic electron bunch moving along a curved trajectory in the magnetic field of the bending magnet. The measured value of speed of the light pulse in vacuum coincided with the tabular value of the light speed within 0.5%. Results of the measurements support the second postulate of Einstein's special theory of relativity about independence of speed of light from the source velocity. The paper contains schematic of the experiment, description of its components, main parameters of Siberia-1 electron storage ring and electron bunches. Description of the method of direct measurement of light speed as well as experimental oscillograms and calculation data are also presented.

WEPPD013	Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery	cavity, linac, photon, FEL	593
	V.G. Kurakin, P.V. Kurakin LPI, Moscow, Russia
	In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.

WEPPD023	Dubna-Minsk Activity on the Development of 1.3 GHz Superconducting Single-Cell RF-cavity	cavity, niobium, cryogenics, vacuum	602
	N.S. Azaryan, Ju. Boudagov, D.L. Demin, G. Shirkov JINR, Dubna, Moscow Region, Russia M.A. Baturitsky NC PHEP BSU, Minsk, Belarus S.E. Demyanov, E.Yu. Kaniukov Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus V.A. Karpovich, N.V. Liubetsky BSU, Minsk, Belarus R.D. Kephart, L. Ristori Fermilab, Batavia, USA S.V. Kolosov, A.A. Kurayev, A.K. Sinitsyn Belarus State University of Informatics and Radioelectronics (BSUIR), Minsk, Belarus S.I. Maximov, V.N. Rodionova Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, S.V. Yurevich, A.Yu. Zhuravsky Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
	In 2011 Dubna-Minsk collaboration started an activity on the development and manufacture the series of superconducting niobium cavities in the enterprises in Belarus. First results of this work are presented. Simulation code was developed to compute EM characteristics, and to calculate the shape and geometric dimensions of SC niobium RF-cavity taking into account higher order oscillations modes. The calculations of a single-cell and 9-cell cavity were made: the found ratio of the maximum electric field on the cavity axis to an average accelerating field is 2 within 1%; the found geometric factor equals 283 Ohm. Half-cells will be made by hydraulic deep drawing and welded by electron-beam (EBW). A stamping tool for hydraulic deep drawing of the half-cells and a set of technological tools for probing of EBW of two half-cells have been designed. Mechanical properties of niobium and model material (Cu, Al) were investigated. Cryogenic system for low temperature RF tests of the SC single-cell cavity was successfully tested at 4.2 K. Coupling device for RF measurement of the single-cell SC niobium cavity was synthesized and manufactured – the measured standing wave ratio is about 1.01-1.07. Warm RF tests with etalon single-cell cavity were made: fundamental frequency – 1.273 GHz, quality factor (warm) – 28·10³.

WEPPD028	Beam Position Monitor System for 2 MeV Electron Cooler for COSY	proton, controls, gun, high-voltage	608
	E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, V.B. Reva, E. Shubin, D.N. Skorobogatov BINP SB RAS, Novosibirsk, Russia
	The 2 MEV electron cooler for COSY storage ring FZJ is assembling in BINP. Beam position monitor (BPM) system for orbit measurements has been developed and fabricated at BINP. The system contains 2 BPMs inside the cooling section and 10 BPMs in transport channels Continuous electron beam is modulated with a 3 MHz signal for capability to get signals from pickup electrodes. The beam current modulation can be varied in the range of 0.3-1.5 mA. The BPMs inside the cooling section can measure both electron and proton beams. It is achieved by means of switching the reference signals inside the BPM electronics. The BPM electronics provides highly precise beam position measurements. Relative position measurement error doesn’t exceed 1 micron. Design features of the BPM system, its parameters and testing results are presented in this paper.

WEPPD030	New Beam Position Monitor Electronics For VEPP-5 Preinjector	positron, linac, background, injection	614
	A.S. Styuf, G.V. Karpov BINP SB RAS, Novosibirsk, Russia
	A new beam position monitor (BPM) electronics has been designed, manufactured and tested in VEPP-5 preinjector. Preinjector BPM system measures position of single electron and positron bunches for each injection cycle. New BPM electronics provides more high sensitivity with respect to existing one developed in 2004. The system can measure the position of bunches with 10⁸ - 10¹⁰ particles per bunch. The resolution of measurements of single bunch is better than 10 mkm for 10¹⁰ particles per bunch. The features of BPM electronics design, the main parameters and results obtained in VEPP-5 preinjector are presented.

WEPPD039	Development of the New Control Systems for JINR e^- Linac Accelerator Test-Bench	controls, radiation, gun, cathode	626
	M.A. Nozdrin, N. Balalykin, V. Minashkin, V.Y. Schegolev, G. Shirkov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	Linear accelerator test-bench in the Joint Institute for Nuclear Research is based on the part of the accelerator complex which was transferred to the possession of JINR by the National Institute for Subatomic Physics (NIKHEF, Amsterdam). Analysis of the transferred accelerator equipment has shown that full re-engineering is required for its control systems; all other systems are in good condition and have considerable endurance. Results of development and creation of the Electron Gun Control System (EGCS), Video and Analog Signals Control System (VASCS) and Automatic System of Radiation Safety Control (ASRSC) are presented. These systems allowed achieving a commissioning of the first accelerator section of the bench with current of 3 mA in 1 us pulse and at beam energy of 23-25 MeV.

WEPPD040	Precision Thermostatic Control for LUE-200 Accelerator Section	controls, linac, neutron, diagnostics	629
	V.N. Zamriy, A.P. Sumbaev JINR, Dubna, Moscow Region, Russia
	According to the design of the IREN facility the system of thermostatting of LUE-200 linac sections is developed. Rated values of linac beam power depend basically on a microwave power input and stability of the phase. The latter is sustained by means of thermostatic control for the sections subject to the powerful microwave warming-up. Demanded both high accuracy of stabilization and low settling time of temperature for linac modes define development of the control system. The precise system of thermostatic control in which composition the programmable PID-controller and the platinum resistance thermometer with accuracy of 0.1%, and also thyristor regulators of heating power up to 15 kVА has been adapted for modes of the IREN microwave facility. The advanced system allows to control both power of heating and a flow of cooling water. The system supervises and changes over modes of the accelerated warming-up and controllable heating and cooling. Both high accuracy of the thermostat and energy saving at a smooth settling of temperature and at the subsequent long-term thermostabilization are substantially improved. Essential speed-up of a preliminary warming-up of the thermostat also is attained.

WEPPD047	The Optimization of RF Deflector Input Power Coupler	coupling, emittance, simulation, diagnostics	650
	A.Yu. Smirnov, O.A. Adonev, N.P. Sobenin MEPhI, Moscow, Russia A.A. Zavadtsev Nano, Moscow, Russia
	This paper concerns the investigation of different types of input power cell for S-band RF electron deflector. This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-like wave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on its length and has to provide high enough deflecting potential to a particle during its flight time it is significant to increase the transversal field strength in coupling cell or to shorten it so that the deflecting potential remains constant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the same length equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper different length are considered and numerically simulated in order to choose the best one.

WEPPD053	New Electron Beam Reference Orbit Measurement System at Dedicated Synchrotron Radiation Light Source SIBERIA-2	brilliance, controls, radiation, synchrotron	662
	Y.A. Fomin, V. Korchuganov, A.G. Valentinov NRC, Moscow, Russia R. Hrovatin, P. Leban I-Tech, Solkan, Slovenia N.I. Moseiko RRC, Moscow, Russia
	The paper focuses on the project of the electron beam closed orbit measurement system at SR source SIBERIA-2 realizing at present time at Kurchatov Institute. The main purpose of new closed orbit measurement system creation is an improvement of the electron beam diagnostic system at storage ring. In addition, it will be a part of fast feedback system which will damp the distortions of the closed orbit at SIBERIA-2. This system provides continuous measurements of the electron beam closed orbit during storing, ramping and operation for users. Besides, with the help of the system it is possible to carry out turn-by-turn measurements of the electron beam trajectory during injection process. The paper describes the new orbit measurement system, the principle of operation and its technical characteristics.

WEPPD057	Commissioning of New Diagnostic Devices at PITZ	emittance, booster, cavity, quadrupole	674
	D. Malyutin, M. Krasilnikov, J. Meissner, F. Stephan, G. Vashchenko DESY Zeuthen, Zeuthen, Germany K. Kusoljariyakul, S. Rimjaem Chiang Mai University, Chiang Mai, Thailand
	The Photo Injector Test facility at DESY, Zeuthen site (PITZ) is the test stand of the electron source for the European X-ray Free Electron Laser (XFEL). The main goal of the facility is the detailed characterization of the electron bunch parameters produced by the RF photo-cathode gun. Characterization of the bunch longitudinal properties such as bunch length or longitudinal phase space earlier was done using a streak camera, which measures the Cherenkov light produced by electron bunches passing through aerogel radiators. Recently, a Transverse Deflecting Structure (TDS) and a Second High Energy Dispersive Arm (HEDA2) were installed in the PITZ beamline. They will enable time resolved measurements of the electron bunch with much better time resolution than the streak camera system. The first results of the commissioning of the HEDA2 section at PITZ are presented in this contribution.

WEPPD059	AIRIX Measurement Chain Optimization For Electron Beam Dynamic and Dimensional Characteristics Analysis	emittance, target, beam-transport, extraction	677
	F. Poulet, V. Bernigaud, H. Dzitko, J.K. Kranzmann, C. Noël, O. Pierret CEA, Pontfaverger-Moronvilliers, France C. Chollet CEA/DAM/DIF, Arpajon, France
	AIRIX is a linear accelerator dedicated to X-ray flash radiography at CEA's hydrotest facility. It has been designed to generate an intense X-ray pulse using a 2 kA, 19 MeV and 60 ns electron beam. The electron beam transport in the accelerator is insured by the knowledge of the dynamic and dimensional characteristics of the beam created downstream the injector. These characteristics are assessed from a measurement chain, established by adapted optics and an intensified camera, aiming at observing the Cerenkov radiation produced during the interaction of electrons with a mylar target placed in the beam. This paper deals with the characterization, and comparison with the previous model, of a new intensified camera which was experimentally tested on AIRIX during an injector characterization campaign. This allowed defining profile and emittance beam characteristics. The obtained results are promising and revealed very interesting properties in particular in term of dynamic, temporal resolution, linearity and signal-to-noise ratio.

WEPPD060	Distributed Control System for an Industrial Electron Beam Accelerator	controls, vacuum, high-voltage, gun	680
	V. Sharma BARC-EBC, Mumbai, India
	Funding: Bhabha Atomic Research Center, Trombay, Mumbai A 3MeV DC Electron beam accelerator has been developed at Electron Beam Center, BARC, Mumbai, India. PLC based distributed control system has been incorporated for the control of the accelerator. A touch screen user interface (HMI) based control system provides a single point control of the whole accelerator. The accelerator operation data is stored in the memory Flash card of the HMI. The Accelerator has many subsystems such as scan magnet supply to scan the electron beam, Chiller unit to supply chilled water to the accelerator for cooling,vacuum system to maintain the vacuum inside the beam line,high voltage unit to generate the EHV for electron acceleration and other support system. All the above subsystems have to be controlled from the central location in order to operate the accelerator safely. Each of the subsystem has been controlled by a PLC controller independently and their control and safety is ensured by the program logic algorithm. After each of the subsystem has been tested separately all the PLCs are connected to the central PLC on modbus RS232 and modbus TCP-IP. The main central PLC has been programmed to fetch the data from individual subsystems PLCs and provide control and monitoring of the accelerator. In auto mode of operation setting the accelerator parameters operates all the subsystems automatically.

WEPPD061	Design and Simulation of a New Faraday Cup for ES-200 Electrostatic Accelerator	proton, simulation, ion, high-voltage	682
	E.E. Ebrahimibasabi, S.A.H. Feghhi, M. Khorsandi sbu, Tehran, Iran
	Faraday Cups have been used as diagnostic tools to measure the charged particle beam current directly. Up to now, different designs have been introduced for this purpose. In this work a new design of Faraday Cup for ES-200 accelerator, a proton electrostatic accelerator which is installed at Shahid Beheshti University, has been performed. FC's dimensions and desirable material were considered Based on the ES-200 beam characteristics (maximum energy of 200 keV and maximum current of 500 mkA). Thickness and dimensions of FC has been calculated by SRIM code according to the range of proton and induced electrons. MCNPX Monte Carlo code was used in order to simulate the angular dispersion and flux of back scattered and secondary electrons that are produced in collision of energetic protons. The Appropriate FC geometry specifications have been calculated by using MCNPX code. Final Simulation and validation of the FC performance has been done by using CST Studio package. In addition, the heat power generated due to proton collision with FC has been calculated analytically and the required cooling system has been designed by ANSYS. Results showed that the new designed Faraday Cup has a good performance to measure the proton beam produced by ES-200 ion accelerator.

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MOXCH02

Accelerators: Engines for Traversing a Large and Often Difficult Landscape

synchrotron, ion, laser, neutron

1

A. Sessler
LBNL, Berkeley, California, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-05CH11231.
The many applications of accelerators are presented, with pictures and comments, upon the machines and the results obtained with them. Attention is then given to possible future applications, along with comments as to what is requited for these applications. Finally, some remarks are made as to what might be the future development of accelerators. In short, the presentation should serve as an introduction to the Conference itself where there shall be many – wonderfully detailed - contributions to all of this.

Slides MOXCH02 [3.804 MB]

MOXCH04

Laser-Plasma Acceleration – Towards a Compact X-ray Light Source and FEL

laser, plasma, acceleration, FEL

9

A. Seryi
JAI, Oxford, United Kingdom

Funding: The work is supported in part by UK STFC JAI grant ST/G008531.
Advances in many scientific and technical fields depend on availability of instruments, which can probe the structure of materials or molecules on unprecedented levels of spatial or temporal resolution. Many of such instruments are based on accelerators of charged particles, with particular examples of synchrotron radiation light sources and coherent X-ray Free Electron Lasers. The high cost of such facilities, however, preclude wide spread of such instruments. Modern accelerator science witnesses emergence of a new direction – compact x-ray sources are coming to the scene, enabled by the synergy of accelerators and lasers, where high gradient laser-plasma acceleration can significantly reduce the size and cost of the facilities. Compact x-ray sources will be developed in the nearest future and will share their scientific and market niche with large national scale x-ray facilities. The compact sources will in particular be suitable for placement in universities and medical or technological centres. The compact x-ray light sources are being developed by many centres in UK. Development of compact x-ray FEL is a promising topic for scientific and technological collaboration between UK and Russia, where expertise of partners will cross-fertilize their ability to solve scientific and technological challenges.

Slides MOXCH04 [12.555 MB]

MOYCH02

e⁺e⁻ Collider VEPP-4M: Status and Prospects

collider, target, luminosity, synchrotron

20

E.B. Levichev
BINP SB RAS, Novosibirsk, Russia

In the paper we discuss recent results and prospects of VEPP-4M collider in the field of high energy physics. The experimental program in the low energy range (less than 2 GeV per beam) is almost completed and in future we are going to concentrate on beam energy increase. Also we describe the VEPP-4M features for other (non-HEP) experiments including synchrotron radiation, beam test facility, accelerator physics issues, etc.

Slides MOYCH02 [2.707 MB]

MOZCH01

Beam Instability Phenomena Observed at HIRFL-CSR in the Presence of Electron Cooler

ion, injection, storage-ring, accumulation

33

X.D. Yang, G.H. Li, J. Li, P. Li, X.M. Ma, R.S. Mao, T.L. Yan, J.C. Yang, Y.J. Yuan, T.C. Zhao
IMP, Lanzhou, People's Republic of China
L.J. Mao
FZJ, Jülich, Germany

Funding: Work supported by The National Natural Science Foundation of China, NSFC(Grant No. 10975166, 10905083)
The 35kV and 300kV electron coolers of HIRFL-CSR have come into routine operation. Some signal samples acquired from BPM and Schottky probes during operation were presented in this paper, and they were observed in the different operation periods such as during injection, after cooling and cooling force measurement. These signals were considered related with the ion beam instability. The central frequency of ion beam varied with the time. Some were caused by the ripple of hardware, the other were created by ion beam itself. The reasons which caused these phenomena were analysed. The possible solutions were suggested, and some necessary upgrade and improvements were expected. These results were helpful to attempt the Schottky Mass Spectrometry measurement in the CSR.

Slides MOZCH01 [5.663 MB]

TUXCH01

High Voltage Electron Cooler

high-voltage, solenoid, ion, proton

38

V.V. Parkhomchuk, M.I. Bryzgunov, V.M. Panasyuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia
A.V. Bubley
BINP, Novosibirsk, Russia
J. Dietrich, V. Kamerdzhiev
FZJ, Jülich, Germany

The results of commisioning with electron beam the high voltage electron cooler for COSY synchrotron will report.

Slides TUXCH01 [4.239 MB]

TUXCH02

New Developments in High Energy Electron Cooling

high-voltage, laser, diagnostics, gun

43

J. Dietrich
DELTA, Dortmund, Germany

Electron cooling of hadron beams is a powerful technique by which accelerator facilities achieve the necessary beam brightness for their physics research. An overview on the latest developments in high energy electron cooling (electron beam energy higher than 500 KeV) is given. Technical feasibility for electron beam energy up to 8 MeV is discussed.

Slides TUXCH02 [3.122 MB]

TUXCH03

Approach to the Low Temperature State Oriented for Crystalline Beam

laser, ion, proton, synchrotron

48

A. Noda, M. Nakao, H. Souda, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
M. Grieser
MPI-K, Heidelberg, Germany
Z.Q. He
TUB, Beijing, People's Republic of China
K. Jimbo
Kyoto University, Institute for Advanced Energy, Kyoto, Japan
I.N. Meshkov, A.V. Smirnov
JINR, Dubna, Moscow Region, Russia
K. Noda, T. Shirai
NIRS, Chiba-shi, Japan
H. Okamoto, K. Osaki
HU/AdSM, Higashi-Hiroshima, Japan
Y. Yuri
JAEA/TARRI, Gunma-ken, Japan

Funding: Work supported by Advanced Compact Accelerator Development of MEXT. It is also supported by GCOE project at Kyoto University, "The next generation of Physics-Spun from Universality and Emergence".
With the use of S-LSR, an ion storage and cooler ring at ICR, Kyoto University, approach to attain the low temperature beam has been continued in these several years. Based on the realization of one dimensional ordered state of 7 MeV proton beam by an electron cooling*, effort to reach lower temperature by laser cooling with much stronger cooling force, has been continued for 40 keV Mg ion beam. With the use of synchro-betatron resonance coupling(SBRC), longitudinal cooling effect can be well expected to be transferred to the transverse directions** and we have experimentally demonstrated of such effect***. The transverse cooling efficiency is, however, not so good deteriorated by intra-beam scattering (IBS) effect for the beam intensities higher than 10⁷. Although the reduction of the beam intensity keeping enough S/N ratio for observation of the beam, is not so easy, we are now challenging "controlled scraping", which controls the horizontal scraper position according to the extent of the indirect horizontal laser cooling by SBRC. In the present paper, our research stream from electron cooling to multi-dimensional laser cooling is surveyed at first and then challenge toward the crystalline beam is to be presented.
*: T. Shirai et al., Phys. Rev. Lett., Vol.98 (2007)204801.
**:H. Okamoto, A.M. Sessler and D. Möhl, Phys. Rev. Lett. Vol.72 (1994) 3977.
***: M. Nakao et al., to be submitted to Phys. Rev. ST-AB.

Slides TUXCH03 [8.557 MB]

TUYCH02

Beam Cooling at NICA Collider

ion, collider, accumulation, space-charge

53

T. Katayama
GSI, Darmstadt, Germany
I.N. Meshkov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

At the NICA collider project it is planned to make collision of 24 short bunches, each containing around 10⁹ 197Au⁷⁹⁺ ions, at the two colliding points in the ring. The operation energy is envisaged from 1 GeV/u to 4.5 GeV/u. To prepare such beam conditions, the beam cooling technique, stochastic and electron beam, is employed at the beam accumulation from the injector Nuclotron and the following short bunch formation stage. Rather long pulse beam could be injected and accumulated in the collider with use of barrier voltage and beam cooling. After the enough beam accumulation, typically 2.4·10¹⁰, the high voltage RF with harmonic number 24 is applied to the accumulated coasting beam as well as the beam cooling which allow us to make the required short bunch of around 1nsec rms bunch length. The equilibrium condition is attained after 100~200 sec cooling, with the balance of RF force, cooling effects, IBS diffusion and the space charge repulsion force. In the present paper, detailed simulation results of beam accumulation and short bunch formation with stochastic cooling and electron cooling are presented including the space charge effects.

Slides TUYCH02 [6.065 MB]

TUACH01

Status of the High Voltage Electron Cooler Project for NICA Collider

solenoid, high-voltage, acceleration, gun

58

S. Yakovenko, E.V. Ahmanova, A. Ivanov, A.G. Kobets, I.N. Meshkov, A.Yu. Rudakov, A.V. Smirnov, N.D. Topilin
JINR, Dubna, Moscow Region, Russia
A.V. Shabunov
JINR/VBLHEP, Moscow, Russia

The electron cooling system at electron energy up to 2.5 MeV for the NICA collider is under design at JINR. The magnetic system and system of transfer of capacity on high potential is developed. The high voltage generator prototype on 250 kV was tested. The technical design of the electron cooling system was started.

Slides TUACH01 [1.035 MB]

TUACH02

Long Term Beam Dynamics Simulation with the BETACOOL Code

ion, injection, simulation, collider

60

A.V. Smirnov, A.O. Sidorin
JINR, Dubna, Moscow Region, Russia

General goal of the BETACOOL program is to simulate long term processes (in comparison with the ion revolution period) in the ion storage ring leading to variation of the ion distribution function in 6 dimensional phase space. The ion beam motion inside a storage ring is supposed to be stable and it is treated in linear approximation. Results of the numerical simulation of the beam dynamics for new projects FAIR (GSI, Germany) and NICA (JINR, Russia) are presented.

Slides TUACH02 [1.004 MB]

TUZCH01

Current Plans for Beam Cooling at FAIR

antiproton, ion, target, storage-ring

63

M. Steck
GSI, Darmstadt, Germany

In the new FAIR accelerator facility the production of intense secondary beams largely relies on beam cooling. The pre-cooling of secondary beams, either antiprotons or rare isotopes, is performed in the large acceptance Collector Ring (CR). A stochastic cooling system is under development which can be applied to both species, although they have different velocities. After transfer of the pre-cooled beams to the High Energy Storage Ring (HESR) stochastic and electron cooling will be available. In the HESR cooling allows accumulation of secondary beams, improvement of beam quality and luminosity for internal experiments and compensation of beam heating by the internal target. The proposed cooling procedures and the status of the beam cooling systems will be reviewed.

Slides TUZCH01 [4.493 MB]

THXCH01

MARS: Fourth Generation X-Ray Light Source Based on Multiturn Energy-Recovery Linac

undulator, radiation, brightness, photon

123

G.N. Kulipanov, Ya.V. Getmanov, O.A. Shevchenko, A.N. Skrinsky, N. Vinokurov
BINP SB RAS, Novosibirsk, Russia
V. Korchuganov
RRC, Moscow, Russia
M.V. Kovalchuk
NRC, Moscow, Russia

In the recent years, Russian government and scientific society have been coming gradually to an understanding the way of development science in Russia. Government have accepted a program of building six mega-science projects, and one of them can be a new 4-th generation x-ray light source based on accelerator-recuperator. Multiturn energy recovery linacs (ERL) looks very promising for making modern synchrotron radiation sources, being less expensive and more flexible. At this time only one multiturn ERL exists. This Novosibirsk ERL operates with two orbits and two free electron lasers based on one linac now. The conception of Multiturn Accelerator-recuperator Radiation Source (MARS) was proposed in 1997 by G.N. Kulipanov, A.N. Skrinsky and N.A. Vinokurov. The use of the ERL with two separated accelerating structures allows to exclude main disadvantages of scheme with one linac, such as the pass of electron bunches with different energies through the same magnetic arcs. The feasibility study for such ERL-based high brightness x-ray source is presented.

Slides THXCH01 [2.385 MB]

THXCH02

The Development of Synchrotron Radiation Source of NRC "Kurchatov Institute"

wiggler, controls, storage-ring, synchrotron

126

V. Korchuganov, A. Belkov, Y.A. Fomin, E.V. Kaportsev, G.A. Kovachev, M.V. Kovalchuk, Y.V. Krylov, K. Kuznetsov, V.V. Kvardakov, V.V. Leonov, V.I. Moiseev, V.P. Moryakov, K. Moseev, N.I. Moseiko, D.G. Odintsov, S.G. Pesterev, Yu.F. Tarasov, S.I. Tomin, V. Ushkov, A.G. Valentinov, A. Vernov, Y.L. Yupinov, A.V. Zabelin
NRC, Moscow, Russia

Russia's first dedicated SR source based on electron storage ring Siberia-2 entered service in late 1999, Kurchatov Institute, Moscow. The report focuses on the consumer parameters of an electron beam and the further development of actual SR source, SR beam lines and experimental stations in 2012.

Slides THXCH02 [5.459 MB]

THXCH03

Current FEL Physics Research at SLAC

FEL, laser, undulator, radiation

131

G.V. Stupakov
SLAC, Menlo Park, California, USA

Funding: Work is supported by Department of Energy contract DE-AC02-76SF00515
SLAC is a home of the first hard x-ray free electron laser - the Linac Coherent Light Source, or LCLS, based on Self-Amplified Stimulated Emission (SASE) principle. Being a user facility, LCLS, as well as some other installations at SLAC, are, at the same time, test beds of research aimed to improving fundamental characteristics of free electron lasers. In this presentation I will review results of some of these studies. They include studies of the FEL seeding based on the Echo-Enabled Harmonic Generation (EEGH) carried out at the NLCTA facility at SLAC, hard x-ray self seeding at LCLS, noise suppression experiments, and research aimed to achieve terawatt-scale power in FELs. A brief review of the plans for LCLS upgrade will be given.

Slides THXCH03 [10.105 MB]

THXCH04

Budker INP Free Electron Laser Facility – Current Status and Future Prospects

FEL, undulator, radiation, linac

136

O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, E.I. Gorniker, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, L.A. Mironenko, V.K. Ovchar, B.Z. Persov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, G.V. Serdobintsev, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, N. Vinokurov, M.G. Vlasenko, P. Vobly, V. Volkov
BINP SB RAS, Novosibirsk, Russia

The free electron laser (FEL) facility at Budker INP is being developed for more than 15 years. It is based on the normal conducting CW energy recovery linac (ERL) with rather complicated magnetic system lattice. Up to now it is the only one in the world multiorbit ERL. It can operate in three different regimes providing electron beam for three different FELs. Its commissioning was naturally divided in three stages. The first stage ERL includes only one orbit placed in vertical plane. It serves as electron beam source for terahertz FEL which started working for users in 2003. Radiation of this FEL is used by several groups of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized in experiments on material ablation and biological objects modification. The second stage ERL is composed of two orbits located in horizontal plane. The second stage FEL is installed on the bypass of the second orbit. The first lasing of this FEL was achieved in 2009. The last stage ERL will include four orbits. Its commissioning is in progress now. In this paper we report the latest results obtained from the operating FELs as well as our progress with the commissioning of the two remaining ERL beamlines. We also discuss possible options for the future upgrade.

Slides THXCH04 [5.360 MB]

THBOR03

A Possibility of High-Energy Bremsstrahlung Dosimetry by Indium Activation

target, simulation, radiation, photon

155

V.L. Uvarov, A.N. Dovbnya, V.V. Mytrochenko, V.I. Nikiforov, S.A. Perezhogin, Yu.V. Rogov, V.A. Shevchenko, I.N. Shlyakhov, B.I. Shramenko, A.Eh. Tenishev, A.V. Torgovkin
NSC/KIPT, Kharkov, Ukraine

Development of a number of promising photonuclear technologies is connected with the use of bremsstrahlung sources having end-point energy up to 100 MeV and average radiation power of tens kW. Commonly, such sources are created on the basis of high-current electron linacs. A possibility of bremsstrahlung dosimetry by means of activation of a target from indium of natural composition and absorbed dose determination through the specific activity of the 115mIn isomer is reported. Preliminary study of isomer photoactivation as well as the yield of reference reactions from simultaneously irradiated natural molybdenum was conducted by simulation technique. Joint measurement of the 115mIn, 90Mo, 99Mo activity and absorbed dose in the PMMA standard dosimeters were carried out at LU-10 and LU-40 linacs of NSC KIPT in the electron energy range 8…70 MeV. It was found that, within the range of study, the ratio of the 115mIn specific activity to absorbed dose in the PMMA slightly depends on the bremsstrahlung end-point energy.

Slides THBOR03 [0.553 MB]

THBCH02

Beam Extraction System for Industrial Electron Accelerator ILU-14

extraction, vacuum, radiation, controls

161

V.V. Bezuglov, A.A. Bryazgin, B.L. Faktorovich, E.N. Kokin, V.M. Radchenko, E.A. Shtarklev, A. YU. Vlasov
BINP SB RAS, Novosibirsk, Russia

This paper describes beam extraction system for pulse linear electron accelerator ILU-14 with energy range 7.5-10 MeV and beam power up to 100 kW. The main aim of this work was to achieve the uniform dose field in radiation zone. Admissible dose nonuniformity is of no more than ± 5% along the scanning length up to 1 m (if necessary, the scanning length may be reduced). Geometrical and electron-optical characteristics of all the beam channel elements were optimized after computer simulation of electron trajectories. To achieve the required nonuniformity of dose field additional electromagnets were installed. These magnets realize beam focusing and centering of the beam endwise of the channel, as well as correction of the scanning field. Control system of magnets power supply allows the online correction of electron beam.

Slides THBCH02 [0.403 MB]

THCCH02

Characteristics of the Model of Linear Accelerator Based on Parallel Coupled Accelerating Structure with Beam Loading

beam-loading, cavity, injection, gun

164

Y.D. Chernousov
ICKC, Novosibirsk, Russia
A.M. Barnyakov, A.E. Levichev, V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

The 5-cavity model of linear accelerator based on the parallel coupled accelerating structure (LAPCAS) is under study. Linear accelerator is equipped with focusing system based on permanent magnet and three-electrode gun with RF control. The work of accelerator with electron beam is demonstrated. The parameters of short pulses mode are following: electron energy - 4 MeV, pulse current - 0.3 A, pulse duration - 2.5 ns; the parameters of long pulses mode are following: energy - 2.5 MeV, pulse current - 0. 1A, pulse duration - 0.1 - 4 us. Working frequency of the accelerator is 2.45 GHz. In RF-controlled mode the capture of about 100% is demonstrated. The beam loading effect is observed. The compensation of energy spread of accelerated electrons by delaying the moment of injection in the LAPCAS is demonstrated. The equations of transient process in the accelerating cavity which is powered by an external RF generator and excited by electron bunches in a simple form are presented.

Slides THCCH02 [1.154 MB]

FRXCH01

NIIEFA Accelerators for Industry and Medicine

radiation, cyclotron, neutron, high-voltage

167

M.F. Vorogushin
NIIEFA, St. Petersburg, Russia

The D.V. Efremov Institute (NIIEFA) is one of the leading enterprises in Russia involved in designing and manufacturing of applied charged particle accelerators as well as electrophysical systems based on these accelerators. Since the foundation of the Institute, we have designed, manufactured and delivered to Russian customers and abroad more than three hundred accelerators for diverse applications, in particular, cyclotrons, linear electron accelerators, high-voltage accelerators and neutron generators. The activities of the Institute in the field of accelerating engineering encompasses all the stages of an accelerator manufacturing, starting from R&D works to manufacturing, installation and maintenance of the delivered equipment. The Institute is granted the license and the International Certificate for the Quality Management System based on the International Standard ISO 9001 for designing, development, production, installation and maintenance of charged particle accelerators. Nowadays, there are the following most promising fields of application of the accelerators designed and manufactured in NIIEFA, namely: nuclear medicine, radiotherapy and neutron therapy, non-destructive inspection, activation analysis, electron-beam sterilization, radiation processing in industry and environmental protection.

Slides FRXCH01 [2.865 MB]

FRXCH05

Irradiation Facilities and Complexes of INRP RFNC-VNIIEF

radiation, neutron, target, cathode

176

N.V. Zavyalov, V.F. Basmanov, A.A. Devyatkin, V.S. Gordeev, S.A. Gornostay-Polsky, A.V. Grishin, A.V. Grunin, V.F. Kolesov, G.A. Myskov, S.T. Nazarenko, V.T. Punin, V.A. Savchenko, A.V. Telnov, S. Vorintsov
VNIIEF, Sarov (Nizhnii Gorod), Russia

The given review presents installations produced and applied at the Nuclear Radiation Research Institute (NRRI) of RFNC – VNIIEF to simulate under laboratory conditions the effects of nuclear explosion and space ionizing radiation on the special-purpose installations. Available is a brief description of the installation itself and characteristics of different-type electron accelerators and two irradiation complexes PUL'SAR and LIU-10M-GIR2 created on the base of high-current linear induction electron accelerators and pulsed nuclear reactors. There are considered electron accelerators GAMMA and BETA-8 that are being created at present.

FRXOR01

Technique and Instrumentation For Bunch Shape Measurements

target, linac, electromagnetic-fields, ion

181

A. Feschenko
RAS/INR, Moscow, Russia

Bunch shape is one of the most important, interesting but difficult to observe characteristics of a beam in ion linear accelerators. Different possibilities of bunch shape measurements are considered but the emphasis is put on the Bunch Shape Monitors (BSM) developed in INR RAS. The operation of BSM is based on a coherent transformation of a longitudinal structure of a beam under study into a spatial distribution of a secondary electron beam through rf scanning. BSM characteristics found both by simulations and experimentally are presented; the ultimate parameters and the limitations are discussed. Modifications of BSM are described. Some experimental results of bunch observations are demonstrated.

Slides FRXOR01 [6.339 MB]

FRACH04

Acceleration Technique Developed at JINR for Hadron Therapy

ion, cyclotron, extraction, proton

194

E. Syresin
JINR, Dubna, Moscow Region, Russia

The JINR activities are aimed on the construction of accelerators for proton and carbon ion therapy. JINR-IBA have developed and constructed the proton cyclotron C235-V3. The cyclotron will be delivered in the first Russian hospital center of the proton therapy in Dimitrovgrad in 2012. The project of the medical carbon synchrotron was developed in JINR. The project goal is accumulation of the superconducting Nuclotron technology at construction of the carbon synchrotron. Accelerated 12C ion beams are effectively used for cancer treatment. The PET is the most effective way of tumor diagnostics. The intensive radioactive 11C ion beam could allow both these advantages to be combined. JINR-NIRS collaboration develops formation of a primary radioactive ion beam at intensity on the tumor target of 10⁸ pps for the scanning radiation. A superconducting cyclotron C400 has been designed by the IBA-JINR collaboration. This cyclotron will be used for radiotherapy with proton, helium and carbon ions. Its construction was started in 2010 within the framework of the Archarde project (France). The interaction between delta electrons and DNA molecules is one of the important processes in the hadron therapy. The formation of low energy electrons and DNA ions are presented for the KEK electrostatic storage ring with the electron target developed by JINR-NIRS collaboration.

Slides FRACH04 [2.934 MB]

FRYOR02

Status Report on Physics Research and Technology Developments of Electron String Ion Sources of Multicharged Ions

ion, ion-source, injection, solenoid

208

E.E. Donets, D.E. Donets, E.D. Donets, S.V. Gudkov, A.Yu. Ramsdorf, V.V. Salnikov, V.B. Shutov
JINR, Dubna, Moscow Region, Russia

Electron String Ion Source (ESIS) "Krion-2" (JINR) is the first and now only ion source of such type in the world. ESIS is a sophisticated modification of Electron Beam Ion Source (EBIS) working in a reflex mode of operation under very specific conditions. The main results, which were achieved during recent years are: Au⁵⁴⁺ ion beams with intensity 5x10⁷ particle per pulse were first produced, ion-ion cooling technology was demonstrated to prove its efficiency for a thermal ion loss reduction and Krion-2 was used for production and injection of Xe⁴²⁺ ion beam into LINAC injector of JINR synchrotron Nuclotron, where the beam was first accelerated to relativistic energy in March 2010 [1-3]. At the present time an essential progress was achieved in construction of the new 6 Tesla ESIS, which is expected to be the full scale prototype of a highly charged ion source for NICA - the new JINR accelerator complex. It is foreseen in the NICA project that new ESIS will provide Au³²⁺ beams with ion yield about 2x10⁹ ppp. However, a project parameters of new Krion-6T ion source allow to expect production of even more highly charged states of heavy elements, up to Au⁶⁹⁺ in terms of gold. In this case new Krion-6T ESIS is planned to be used on operating JINR "Nuclotron" facility in near future for experiments with an extracted accelerated gold ion beams on a fixed target.
*[1] D.E. Donets, et all, 2010 JINST 5 C09001;
http://iopscience.iop.org/1748-0221/5/09/C09001.
**[2] D.E. Donets, et all, RSI 80, 063304 (2009).
***[3] D.E. Donets, et all, RSI 83, 02A512 (2012).

FRBOR03

Non-gated Field Emission Array as Low-Energy Electron Source: Experiment and Simulation

cathode, vacuum, high-voltage, simulation

218

K.A. Nikiforov, L.I. Antonova, N.V. Egorov, V.V. Trofimov
St. Petersburg State University, St. Petersburg, Russia

A non-gated NbN on Si wafer field emission arrays are studied. The I-V measurements and emission characteristics of edge-shaped cathodes in atmosphere low-voltage regime are considered. Mathematical and computer models are presented. The current density obtained from experiment was up to 384 Ampere per square centimeter in emission area 9 sq.mm. Low-voltage regime (20 V) for near (~ 1mkm) interelectrode distance in diode configuration is discussed.

FRBCH03

High Voltage ELV Accelerators for Industrial Application (Family of Accelerators and Tendency of Development)

ion, extraction, vacuum, high-voltage

227

B.S. Han, W.G. Kang, S.M. Kim
EB TECH Co. Ltd., Daejeon, Republic of Korea
N.K. Kuksanov, R.A. Salimov
BINP SB RAS, Novosibirsk, Russia

Due to the necessity of pilot scale test facility for continuous treatment of wastewater and gases on the spot, a mobile electron beam irradiation system mounted on a trailer has developed in EB TECH Co. Ltd. and Budker Institute of Nuclear Physics. This mobile electron beam irradiation system is designed for the individual field application with self-shielded structure of steel plate and lead block which will satisfy the required safety figures of ICRP. Design parameters are limited by the allowable total weight and height of the trailer on the road which controlled by National Authorities. Therefore, the output parameter of electron beam is designed for 0.7 MeV and 20 kW through 600 mm window. Shielding of a mobile electron accelerator has been examined by Monte Carlo technique (MCNP code). Calculations using two different versions (version 4c2 and version 5) of MCNP showed agreements within statistical uncertainties, and the highest leakage is far below the tolerable radiation dose limit. This mobile unit will be used for on-site test of liquid waste and gaseous waste in Saudi Arabia by Saudi ARAMCO and U.S.A. by PELE Technology Inc. together with EB TECH Co. Ltd. This unit could treat up to 500m3 of liquid waste per day or 10,000 Nm3 of gases per day.

Slides FRBCH03 [11.807 MB]

MOPPA001

Excitation of the Focusing Wakefields by a Relativistic Bunch in Isotropic Capillary Discharge Plasma

plasma, focusing, wakefield, vacuum

242

R.R. Kniaziev, G.V. Sotnikov
NSC/KIPT, Kharkov, Ukraine

At present work excitation of wakefields by an relativistic electron bunch in a capillary tube filled with plasma is investigated. In the approximation of constant velocity of the bunches an analytical expressions for a components of an electromagnetic field are found. Numerical calculations of excited capillary tubes fields fabricated from the alumina and the quartz is carried out. Outer diameter of a capillary tube is equal 1 mm, inner diameter is 0.4 mm. In the absence of plasma in such structure the wakefields of the THz frequencies range are excited. Longitudinal and transverse profiles of wake fields in slow wave structure which drive channel is filled with plasma are investigated in details. These profiles allow to investigate dependences of wakefields from plasma density, the sizes of dielectric structure and/or the linear sizes of an electron bunch. When comparison of these dependences, it follows that there are longitudinal positions of the test bunch relative to the drive bunch, which can provide high-gradient acceleration of charged particles and their simultaneous radial focusing.

MOPPA002

Nonlinear Theory of Excitation of an Axially Asymmetric Wakefield in Dielectric Resonator

wakefield, electromagnetic-fields, vacuum, acceleration

245

K.V. Galaydych, G.V. Sotnikov
NSC/KIPT, Kharkov, Ukraine

A nonlinear self-consistent theory of excitation of an axially asymmetric wakefield by relativistic electron bunches in cylindrical dielectric resonator with a vacuum channel for the charged particles transportation through the resonator is constructed. An excited fields are presented in the form of superposition solenoidal and potential fields. The solenoidal electromagnetic fields are presented by an expansion of the required fields into solenoidal fields of the empty dielectric resonator. The potential field is presented by the eigenfunction expansion method. The dispersion equation for determination of eigenfrequencies and the equation for eigenvalues are obtained, eigenwaves, eigenfunctions and their norms are found. For an excited fields the analytical expressions, that take into account both longitudinal and transverse dynamics of bunch particles are derived. Along with the equations of motion they provide a self-consistent description of the dynamics of generated fields and bunches. The formulated nonlinear theory allows investigating numerically the nonlinear effects such as increasing of the transverse bunch size, and head-tail beam breakup instability, which occurs if the electron bunch in the structure is misaligned.

MOPPA004

Energy Spread Decreasing in Linear Mode Operating Laser Plasma Wakefield Accelerator

plasma, laser, acceleration, bunching

251

S.M. Polozov
MEPhI, Moscow, Russia

Laser plasma wakefield acceleration (LPWA)* is one of most popular novel methods of acceleration. The LPWA is very perceptively because the accelerating gradient in plasma channel can be a number of orders larger than in metal structures. But the LPWA has two serous disadvantages as very high energy spread and low part of electrons trapped into acceleration. The energy spectrum better than 10% does not observed anyone in simulations or experiments. It should be noted that the electron's beam dynamics in LPWA is different for underdense plasma (quasi linear mode) and in for dense plasma (non-linear and bubble modes). Non-linear mode is studying more intensive at present and methods of the energy spread decrease are under development **,***. But the linear LPWA mode also has interest for practical use. The rate of energy gain is very high in the linear mode also and compact laboratory scale facility could be designed to accelerate the electron beam up to a hundreds MeV. Bunching before injection into plasma channel will discuss to decrease the energy spread and to enlarge the electron trapping efficiency.
* T. Tajima, J.M. Dowson. Phys. Rev. Lett., 1979, v. 43, 4, 267.
** S.V. Bulanovet al. Physics of Plasmas, 2008, 15, 073111.
*** E.Esarey et al. Phys. Rev. Lett., 1997, 79, 2682.

MOPPA005

Laser-Wakefield Acceleration with External Bunch Injection at REGAE

plasma, laser, emittance, injection

254

J. Grebenyuk, K. Flöttmann
DESY, Hamburg, Germany
T. Mehrling, J. Osterhoff
Uni HH, Hamburg, Germany

Funding: Helmholtz Alliance
Short and highly intense laser pulses focused into a gas target, ionise the gas and may excite large amplitude plasma waves that support extreme electric fields (>10 GV/m) for acceleration of charged particles. The REGAE facility at DESY, which provides 2-5 MeV of ~10 fs bunches, offers the unique possibility to study the external injection of pre-accelerated electron bunches from a conventional accelerator, and their subsequent acceleration in plasma wakefields. Simulations were performed with the particle-in-cell code OSIRIS, showing a wide variety of effects which can be explored in the future at REGAE. External controlled injection allows to study effects which require precise information about the beam quality, position and momentum at the initial point of injection. Topics of a particular interest are: bunch emittance growth suppression, controlled betatron motion, and longitudinal bunch compression.

MOPPA007

Wakefield Produced by a Small Bunch Moving in Cold Magnetized Plasma Along the External Magnetic Field

plasma, wakefield, acceleration, electromagnetic-fields

257

S.N. Galyamin, D.Y. Kapshtan, A.V. Tyukhtin
Saint-Petersburg State University, Saint-Petersburg, Russia

Funding: The Dmitry Zimin "Dynasty" Foundation and Russian Foundation for Basic Research (Grant No. 12-02-31258).
Plasma wakefield acceleration (PWFA) is a promising tool for acceleration of charged particles to high energies at relatively small lengths. Knowledge about the structure of the electromagnetic field produced by the driver bunch in plasma plays the essential role for the realization of this accelerating scheme. Constant external magnetic field which can be used for focusing the driver bunch affects the field structure essentially because plasma acquires both anisotropy and gyrotropy. However, the electromagnetic field in the latter case has not been practically investigated until present. Here we study the field produced by point charge and small bunch moving in cold magnetized plasma along the external magnetic field. We note the singular behavior of some components of the wave field produced by point charge near the charge trajectory. We also analyze the influence of the external magnetic field and bunch size on the field components.

MOPPA008

Parameter Optimization of a Rectangular Dielectric Based Wakefield Accelerating Structure

wakefield, vacuum, accelerating-gradient, radiation

260

S. Baturin, A. Altmark, I.L. Sheynman
LETI, Saint-Petersburg, Russia
A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio, USA

With this talk, we present the algorithm and simulation results of the wakefield parametric study of the rectangular dielectric based wakefield accelerating structure. Analytical solution of the wakefield generation in the rectangular dielectric structure has been considered to achieve optimal relations between both the geometrical parameters and dielectric constant of the structure, and the beam parameters like bunch charge and bunch length. Optimization has been carried out for maximization of the accelerating gradient at the single LSM11 mode approximation.

MOPPA009

An Analytical Approach to Solution of Self-coordinated Beam Dynamics in Dielectric Wakefield Accelerating Structures

wakefield, focusing, acceleration, radiation

263

I.L. Sheynman
LETI, Saint-Petersburg, Russia

Self-coordinated transverse dynamics of the high current relativistic electronic bunches used for generation of wake fields in wakefield accelerating structures with dielectric filling is investigated. An analytical approach to solution of self-coordinated beam dynamics is developed.

MOPPA010

Numerical and Analytical Methods of Modeling of Bunch Dynamics in Dielectric Filled Accelerating Structures

wakefield, radiation, acceleration, free-electron-laser

266

I.L. Sheynman
LETI, Saint-Petersburg, Russia
A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio, USA

RF waveguide structures are a basis for development of new generation of accelerators on the basis of a wakefield method of the charged particle acceleration, and also free electron lasers. Numerical and analytical calculation methods of Vavilov-Cherenkov radiation generated by relativistic electronic bunches in wave guides with dielectric filling, and also self-coordinated bunch dynamics in own and external fields are considered.

MOPPA016

Dynamics of 197Au⁷⁸⁺ Ions Generated in Recombination with Cooling Electrons in the NICA Collider

ion, synchrotron, collider, vacuum

275

A.V. Eliseev
JINR, Dubna, Moscow Region, Russia
O.S. Kozlov, A.B. Kuznetsov, A.V. Philippov, A.O. Sidorin, A. Tuzikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

Ions 197Au⁷⁸⁺ are generated in recombination of original bare nuclei 197Au⁷⁹⁺ with cooling electrons in the electron cooler of the NICA Collider. The ions 197Au⁷⁸⁺ dynamics is considered in the in energy range 1–4.5 GeV/u when ion beam is bunched with RF voltage (collision mode operation of the NICA Collider). It is shown that some part of 197Au⁷⁸⁺ ions can be involved in synchrotron motion when other part suffers a chaotic motion regime. Most of these ions live in vacuum chamber until further recombination in to the state of 197Au⁷⁷⁺ and leave the Collider acceptance very fast. The evolution in time of ion distribution over the Collider aperture is presented.

MOPPA018

Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure

cavity, coupling, acceleration, collider

281

Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

MOPPA019

RF Antenna Lead

high-voltage, radiation, simulation, cavity

284

A.M. Barnyakov, A.E. Levichev
BINP SB RAS, Novosibirsk, Russia
Y.D. Chernousov
ICKC, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

RF antenna lead is described. This lead is used for RF power input to high voltage electrodes. The device consists of receiving and transmitting antennas realized as symmetrical parts of coaxial cavity with dielectric disk between the parts. Main operating characteristics are the following: high voltage is over 60 kV, coefficient of transmission at the operating frequency is over 0.97, bandpass is over 70% (at the level of -3dB). The scheme of the device, principle of work and measured results are presented.

MOPPA030

X-ray Radiation High-Voltage Elements of the Tandem Accelerator With Vacuum Insulation

radiation, vacuum, high-voltage, neutron

299

I.N. Sorokin, A.G. Bashkirtsev, V.Ya. Chudaev, A.A. Ivanov, D.A. Kasatov, A.S. Kuznetsov, S.Yu. Taskaev
BINP SB RAS, Novosibirsk, Russia

In Institute of Nuclear Physics SB RAS the epithermal neutron source is entered into operation based on the tandem – accelerator with vacuum isolation. It was evaluated the accelerating installation components of a X-ray field causing dark current and breakdowns in accelerating gaps. The estimated account of equivalent doze capacity on different distances from the accelerator in the protected hall and behind its limits is made. The experimental measurements were carried out and the study results of the doze capacity dynamics are submitted, depending on change of a dark current in tandem accelerating gaps at a complete working voltage 1 MV without a beam. The spectrum of X-ray radiation is experimentally measured. It is experimentally revealed and the occurrence of powerful X-ray radiation is investigated at substantial growth of the aperture of the accelerating channel. Are offered and the changes of a design of installation for prevention of occurrence of powerful X-ray radiation are realized. The carried out research allows setting necessary parameters for designing medical installation on the basis of an accelerator - tandem with vacuum isolation with the purpose of realization in oncological clinics neutron-capture therapy of malignant tumours.

TUPPB002

Effect of Gold Nuclei Recombination in Electron Cooling System on Beam Lifetime in the NICA Collider

ion, collider, luminosity, vacuum

307

A.V. Philippov, O.S. Kozlov, A.B. Kuznetsov, A. Tuzikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

On the basis of experimental data the production of the ions Au⁷⁸⁺ and Au⁷⁷⁺ as a result of step-by-step radiative recombination of bare nuclei on free electrons in the NICA Collider electron cooling system is presented. The influence of Au⁷⁸⁺ ions on the luminosity lifetime is discussed. The optimum working cycle of the NICA Collider is described.

TUPPB005

LEPTA Project: Towards Positronium

positron, focusing, gun, injection

316

A.G. Kobets, E.V. Ahmanova, V.I. Lokhmatov, I.N. Meshkov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
JINR, Dubna, Moscow Region, Russia
M.K. Eseev
NAFU, Arkhangelsk, Russia

The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron coolin system. The project positron energy is of 2 – 10 keV. The main goal of the facility is to generate an intense flux of positronium atoms – the bound state of electron and positron. Storage ring of LEPTA facility was commissioned in September 2004 and was under development up to now. The positron injector has been constructed in 2005 - 2010, and beam transfer channel – in 2011. By the end of August 2011 experiments on electron and positron injection into the ring have been started. The recent results are presented here.

TUPPB009

RF Self–Consistent Electron Beam Dynamics Simulation in THz Generator Based on Photoinjector and Cherenkov Decelerating System

radiation, simulation, beam-loading, acceleration

328

T.V. Bondarenko, S.M. Polozov, O.A. Tatsyuk
MEPhI, Moscow, Russia

The generator of high intensity monochromatic radiation in sub-mm band is currently under R&D at the Department of Electrophysical Facilities of MEPhI. This generator is based on photoinjector and irradiating Cherenkov capillary. It is necessary to have high brightness electron beams to generate of monochromatic radiation in this type of structure. These beams can be produced by photocathode and accelerated to energy of several MeV using short structure having high rate of energy gain. Irradiating capillary represents metal tube having inner radius of the radiation wavelength order and covered with dielectric layer or made of corrugated waveguide. It's important to study the self-consistent dynamics of the beam during the acceleration as the pulse current is equal several A, i.e. the beam dynamics should be studied taking into account RF (radiation) field and Coulomb field of self space charge. Another task is to study the electron beam dynamics and fields irradiated by it in decelerating structure in the absence of external fields. The scheme of the facility, its operation mode and high-current beam dynamics simulation results in accelerating and irradiating structures are presented.

TUPPB013

Dependence on Betatron Oscillations of the Angular Velocity

radiation, synchrotron, synchrotron-radiation, quadrupole

340

O.E. Shishanin
MSIU, Moscow, Russia

An examination of this topic among other factors is necessary to an understanding of the role of electron vibrations at the formation of synchrotron radiation. Mentioned problem was resolved by author in various periodic magnetic fields. Influence on radiation of the correction terms to the angular velocity for storage rings is also discussed.

TUPPB014

Cooling of Electron Beams

synchrotron, radiation, storage-ring, cyclotron

342

V.M. Khoruzhiy
NSC/KIPT, Kharkov, Ukraine

Cooling of electron beams (transversal velocities reducing) in storage rings (cyclic accelerators) may be realized using gyromonotron device as part of storage ring at straight-line portion. The gyromonotron is a HF oscillator for cm and mm band of wavelength in which electron beam with nonzero transversal velocities is used for excitation electromagnetic wave. Energy of transversal motion of electron beam converts into energy of electromagnetic wave during multiple passing the same bunches with repetition frequency f0 through gyromonotron. We choose frequency f0 (and corresponding wavelength AL) as minimal frequency (H111 mode) for gyromonotron's resonator. As well known, frequency f0 of H111 mode gives possibility to determine radius of the resonator R~AL/(2*1.71). We assumed above that resonator's length L/(2*R)>1. It is possible for gyromonotron's solenoid to determine longitudinal magnetic field Hz(kOE)=11/AL(cm) for low relativistic beam's energy. For gyromonotron's operation at given frequency it's needed realization of condition for relativistic cyclotron frequency Om_rel/(2*3.14)~ f0. Emitted beam radiation dissipates inside gyromonotron’s resonator (output window is absent). Q-quality gyromonotron’s resonator and pitch factor PF of electron beam have to satisfy condition Q* PF>1 (for "warm" or superconducting (SC) resonators).

TUPPB015

The Parameters Extracted Beams in Recirculator SALO

dipole, quadrupole, recirculation, extraction

344

I.S. Guk, S.G. Kononenko, F.A. Peev, A.S. Tarasenko
NSC/KIPT, Kharkov, Ukraine

Taking into account the nonlinearity of the dipole and quadrupole lenses are calculated beam parameters on the output channels of the recirculator SALO.

TUPPB025

Investigation of Program and Perturbed Motions of Particles in Linear Accelerator

controls, rfq, resonance, simulation

367

I.D. Rubtsova, E.N. Suddenko
St. Petersburg State University, St. Petersburg, Russia

Beam control model for program and perturbed motions with interaction account is realized. Quality functional gradient is obtained.

TUPPB030

Computer Simulation of the Electron Beam Energy Spectrum Measurement by the Magnetic Analyzer Method Based on Scanning System of the Sterilization Installation

induction, acceleration, radiation, simulation

382

P.A. Bystrov, M.A. Alekseev, N.E. Rozanov
MRTI RAS, Moscow, Russia

A method for measuring the characteristic, which makes possible to find the energy spectrum of the electron beam of the accelerator is described. This method uses the magnetic analyzer, which is based on the scanning system of the standing wave linear electron accelerator, mounted on the radiation sterilizer. This characteristic is the dependence of beam current, that reaches the induction sensor at the accelerator output window, on the magnetic field, deflecting the beam from the axis of the system. The results of the measurements of these characteristic, which were performed on the sterilization installation in MRTI, are presented. The computer simulation of electron beam dynamics in the scanning system for the case of these experiments was performed with the help of developed program "BEAM SCANNING". The similar dependence of the beam current on the magnetic field was obtained. The necessity of taking into account the effect of electron reflection from the walls of vacuum chamber is stated. To describe this effect the additional features were implemented in the program. As a result of calculations with the account of this effect, the correspondence of the calculated curve and experimental one was reached. This means that the calculated spectrum corresponds to the actual energy spectrum of the electron beam in the experiment.

TUPPB031

Measurement of Beam Parameters in the VEPP-5 Damping Ring Using Betatron Oscillations Decoherence

damping, betatron, positron, synchrotron

385

A.V. Petrenko, K.V. Astrelina
BINP SB RAS, Novosibirsk, Russia

Funding: RFBR, grant N 09-02-00594-а
The measurement of beam parameters during the commissioning of VEPP-5 Damping Ring is presented. Coherent betatron oscillations of the 380-MeV electron beam were induced by a fast kick. Electrostatic beam position monitors were used to obtain the turn-by-turn transverse beam position data. The form and behaviour of the envelope of oscillations are determined by the beam parameters, chromaticity and nonlinear detuning. Beam emittance and energy spread values have been obtained from the analysis of the beam envelope, nonlinear detuning and chromaticity measurements. The results are in a good agreement with theoretical predictions which were made for calibrated model of the Damping Ring. Independent analysis of betatron spectra envelope have been performed for energy spread measurements as well.

TUPPB033

Simplified Beam Line with Space Charge Compensation of Low Energy Ion Beam

ion, space-charge, ion-source, plasma

388

A.V. Dudnikov
BINP SB RAS, Novosibirsk, Russia

Simplified beam line for low energy Ion implantation is considered. Compensation of the space charge of high perveance, low energy ion beam in beam lines for ion implantation and isotope separation has been investigated. Space charge compensation and overcompensation by ions will be considered. Different mechanisms of the compensating particle formation such as ionization by the beam, secondary emission of electrons and negative ions, electronegative gas admixture, and external plasma sources will be discussed. Advanced space charge compensation increases an intensity of low energy ion beam after analyzer magnet up to 3–4 times. Space charge compensation of positive ion beam by admixture of electronegative gases and damping of the beam instability will be discussed. Up to 6 mA of 11B+ ions with energy 3 keV, 11 mA with 5 keV, and 18 mA with 10 keV have been transported through an analyzer magnet of a high current implanter with space charge compensation by electronegative gases

TUPPB034

Low Energy Cooler for NICA Booster

gun, ion, booster, cathode

391

A.V. Bubley, M.I. Bryzgunov, V.M. Panasyuk, V.V. Parkhomchuk, V.B. Reva
BINP SB RAS, Novosibirsk, Russia

Low energy cooler for NICA project is being currently designed at BINP in collaboration with JINR. From the point of view of its features it is similar to previous low energy coolers manufactured at BINP, i.e. equipped with variable electron beam, electrostatic bending, high precision solenoid etc. The article describes some technical solutions applied to the cooler design.

TUPPB039

The Motion of Ionic Flux in an Electron Layer

ion, plasma, extraction, vacuum

403

A.S. Chikhachev, Y.A. Kovalenko
Allrussian Electrotechnical Institute, Moskow, Russia

Processes of ion extraction from plasma are very important for experiment. This process is studied in a lot of theoretical works. In work * was shown that ions leave plasma with velocities, exceeding ion-sound velocity. In real conditions when electron temperature exceeds the ion temperature, quantity ions accelerated is exponentially small. In work ** was shown that transition layer in system "plasma-vacuum" are infinitely great. In *** equilibrium states with nonzero flow of electrons are studied, where electrons and ions have the same drift direction. In presented work equilibrium states are studied when nonzero electron flow has drift direction perpendicular to ion drift direction. States were examined with finite thickness and in condition of electrons, occupying half of the layer.
* K.-U.Riemann, J.Phys. D, 1991, 24, 493.
** N.Sternberg, V.Godyak, IEEE Plasma Sc., 35, 2007, 1341.
*** Yu.A.Kovalenko, T.V.Chernyshev, A.S.Chikhachev, Izv. RAN, "Energetika", 2011, 4, 24.

TUPPB040

Angiography X-ray Monochromatic Source Based on Radiation From Crystals

radiation, photon, scattering, laser

406

T.V. Bondarenko, G.B. Sharkov
Siemens LLC, Moscow, Russia
Y.A. Bashmakov
LPI, Moscow, Russia
S.M. Polozov
MEPhI, Moscow, Russia

Nowadays angiography has become one of the most commonly used medical procedures. However the X-ray tubes are mostly used in angiography imaging systems. The problem that encounters in using X-ray tubes is low monochromaticity due to bremsstrahlung while angiography imaging requires quasimonochromatic energy spectrum for better image quality and lower dose rate obtained by the patient. The use of the monocrystaline target at the medical electron LINAC can be one of the possible ways to obtain the monochromatic X-ray radiation. This type of X-ray generator will provide monochromatic radiation with photon energy dependent on the electron beam energy. The X-ray generation mechanism, possibilities of monocrystal usage as an X-ray source for angiography and requirements for beam parameters are discussed.

TUPPB043

Program Complex for Vacuum Nanoelectronics Finite Element Simulations

simulation, cathode, vacuum, gun

409

K.A. Nikiforov, N.V. Egorov
St. Petersburg State University, St. Petersburg, Russia

The program complex in MATLAB intended for vacuum nanoelectronics simulations is described. Physical and mathematical models, computational methods and algorithms of program complex are presented. Electrostatic simulation of electron transport processes is discussed under electron massless approximation; current function method and Matlab PDE Toolbox finite element solutions are used. Developed program complex is able to simulate diode and triode structures with complicated submicron geometry, current-voltage characteristics, calculate electric field distribution, estimate electric line interaction. The modelling results by the example of two different triode structures are presented. Matlab stand-alone application with graphical user interface for demonstration purposes is presented.

TUPPB045

The Field Cathodes with the Effect of Space Charge Modeling

space-charge, cathode, vacuum, brightness

415

M.A. Makarova, E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia

This work is devoted to the question of the effect of space charge on the field electron emission. The electrostatic potential distributions for the diode emission systems are calculated. The diode systems, which can be readily constructed, is generally used for the characterization of field emission properties of novel materials. They have some effective applications in vacuum nano- and microelectronics. In this work the plane diode emission system and cylindrical diode emission system are investigated. The solutions of Poisson's equation for the electrostatic potential distribution are received for the boundary-value problems. The right side of Poisson's equation is assumed to be the piecewise constant function. The charge conservation law and the energy conservation law are used. One and two dimensional cases are investigated.

TUPPB047

The Triode-type System on the Basis of the Field Emitter Modeling

cathode, controls, vacuum, ion-source

418

D.S. Televnyi
St. Petersburg State University, St. Petersburg, Russia
E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia

The mathematical model of a cylindrical triode-type system on the basis of the field emitter is under consideration. The internal area of the system is filled of two different dielectrics. Effect of space charge is not considered. The field emitter is modeled by a charged filament of finite length, which located on the system's axis. The modulator has a form of a circular diaphragm. The Poisson equation with the given values of potentials at the electrodes is solved. The variable separation method is used to determine distribution of electrostatic potential. An unknown function of the charge density is approximated by a piecewise constant linear function. The problem of finding unknown coefficients in the potential eigenfunction expansion is reduced to the linear algebraic equations system. Numerical calculations emitter's forms are represented.

TUPPB048

The Multi-Tip Field Emission Cathode Mathematical Modeling

cathode, lattice, vacuum, space-charge

421

N.V. Egorov, E.M. Vinogradova
Saint-Petersburg State University, Saint-Petersburg, Russia

The multi-tip field cathode as the field emission cathode arrays for rectangular lattice is considered. The field emission cathodes are of interest for vacuum nano-scale electronic devices. The electrostatic potential distribution is presented for the periodic system of free-number thin tips on a plane substrate as a field emission cathode and a plane substrate as an anode. The tips shape may be various. The potential of the substrate and cathode is equal the zero, the anode's potential is equal a constant. The effect of space charge is neglected. The each tip is represented as a system of the point charges. The point charges are determined to the zero equipotential coincides with the cathode's shape. The potential distribution is found for whole region of the field emission cathode arrays. The exact three-dimensional solution to the Laplace/Poisson equation has been obtained in the Cartesian coordinate system. This solution has direct applications in three-dimensional calculations of electron trajectories in micron- and submicron-sized field-emitter arrays.

TUPPB049

First Test Results of RF Gun for the Race-track Microtron Recuperator of BINP SB RAS

cavity, vacuum, gun, microtron

424

V. Volkov, V.S. Arbuzov, E.I. Gorniker, E.I. Kolobanov, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, V.N. Osipov, V.M. Petrov, A.M. Pilan, M.A. Scheglov, I.K. Sedlyarov, N. Vinokurov
BINP SB RAS, Novosibirsk, Russia

A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration.

TUPPB050

The System of Power Supplies, Control and Modulation of Electron Gun for Free Electron Laser

controls, cathode, FEL, free-electron-laser

427

V.K. Ovchar, V.R. Kozak, E.A. Kuper, V.R. Mamkin, V.V. Repkov, S.S. Serednyakov, S.V. Tararyshkin, D.A. Zverev
BINP SB RAS, Novosibirsk, Russia

The system of power supplies, control and modulation based on triode cathode-grid unit was designed for producing of pulsed electron beam for free electron laser FEL The main part of the system located inside the tank filled with SF6 gas and has -300 kV potential. It's supplied through the isolated transformer and controlled through the fiber optic link with CAN interface. The GaN RF transistor in the output stage of modulator composed of hybrid assembly on the BeO ceramic plate. Pulsed output voltage of modulator can be regulated 0-120 V on the load 25 Ohm. Time duration is <1 ns. Repetition rate is 0-90 MHz. Start of modulator from timer performed through the 1GHz fiber optic link. The control code was written on C++ language under Windows operating system using QT framework.

TUPPB052

A ps-Pulsed E-gun Advanced to a T-wave Source of MW-level Peak Power

laser, FEL, cathode, radiation

430

A.V. Smirnov
RadiaBeam, Santa Monica, USA

Funding: Department of Energy
A coherent source based on a electron gun is considered to deliver high instantaneous power comparable to that available from just a few other non-FEL and most FEL sources at mm-submillimeter wavelengths. A DC or RF E-gun is integrated with a robust, compact, efficient, dismountable radiator inside the vacuum envelope. Wakefield radiator is driven by a low-energy photoinjector operated in a custom mode combining strong over-focusing, robust slow-wave structure, and pulse sub-ps photoinjectior employing on-cathode beam modulation with conventional optical multiplexing. Single pulse mode operation is enhanced with filed compression effect at high group velocity. The performance is analyzed analytically and numerically supported by experimental data on beam overfocusing. Radiation outcoupling is analyzed as well.

TUPPB053

High Duty Cycle Ion Sources at GSI and FAIR

ion, ion-source, ECRIS, plasma

433

J. Pfister, A. Adonin, W.A. Barth, R. Hollinger, K. Tinschert
GSI, Darmstadt, Germany

Future heavy ion experiments at GSI and FAIR demand for high current as well as highly brilliant ion beams of various metallic and gaseous ions produced by the GSI accelerator facility. Therefore GSI's Ion Source Group is developing and operating various types of ion sources feeding the linac at 2.2keV/u with a maximum mass-over-charge ratio of 65. In this contribution a status overview of operated high duty cycle ion sources including important ion source data as beam current, beam spectrum, transverse emittance, duty factor and transmission along the LEBT as well as future perspectives for the ion source operation for FAIR is presented.

TUPPB058

Improving Efficiency of Plasma Generation in H⁻ Ion Source with Saddle Antenna

plasma, ion, ion-source, gun

439

V.G. Dudnikov, R.P. Johnson
Muons, Inc, Batavia, USA
S.N. Murray, T.R. Pennisi, M.F. Piller, M. Santana, M.P. Stockli, R.F. Welton
ORNL, Oak Ridge, Tennessee, USA

Funding: Work supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant DE-SC0002690.
Progress in development of RF ion source with saddle radio frequency (SA) (RF) antenna which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability is considered. Several versions of new plasma generators with different antennas and magnetic field configurations were tested in the Test Stand. The efficiency of positive ion plasma generation has been improved ~4x times up to 0.18 A/cm² per 1 kW of RF power 13.56 MHz. A new version of the RF assisted triggering plasma source (TPS) has been designed, fabricated and tested. A Saddle antenna SPS with water cooling is being fabricated for high duty factor have been tested.

WEPPC004

Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency

cavity, radiation, linac, coupling

453

S. Proskin, A. Kulago
MEPhI, Moscow, Russia

A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC005

Extreme Density Charge Electron Bunches

target, linac, radiation, controls

456

S. Proskin, A. Kulago
MEPhI, Moscow, Russia

This paper presents untraditional approach for obtaining the DLWG limited bunch charge (LBC). The maximum energy of accelerated bunch is considered. As a result the bremsstrahlung maximum dose rate evaluation is obtained

WEPPC028

High Voltage Terminal in COSY Electron Cooler

controls, high-voltage, power-supply, gun

503

V.A. Chekavinskiy, E.A. Bekhtenev, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, E.A. Kuper, V.R. Mamkin, A.S. Medvedko, D.N. Pureskin, D.V. Senkov, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia

In Budker INP SBRAS was developed electron cooler with energy up to 2MeV for COSY accelerator (Germany). Due to restricted footprint, cooler's collector and gun parts were combined in a single acceleration system – high voltage terminal. All power and control electronics were placed in a single isolated volume, filled with SF6 gas under 4-6 atm. pressure. Electronics is controlled via wireless CAN, and powered by multistage transformer, capable of 15 kW power at 26 kHz. Wireless control is passed through dedicated optically transparent window, also served for modulated laser beam, used in electron beam diagnostic. By construction, electronics is divided on two standalone units: collector power supply and gun-filter system (SGF). SGF is built on 19" EuroPak chassis, where were placed all power modules, needed for collector and gun pipe electrodes. All power outputs were protected against overvoltage and sparks, available while cooler exploitation. In SGF there were controlled up to 40 parameters altogether. SGF inner power supply provides stable operation in wide range of input voltage, up to ±50% from nominal. Also included in SGF are 2 auxiliary systems, used for beam guiding and beam diagnostics.

WEPPC032

The Power Supply System for the Accelerating Column of the 2 MeV Electron Cooler for COSY

high-voltage, solenoid, power-supply, controls

512

D.N. Skorobogatov, M.I. Bryzgunov, A.D. Goncharov, I.A. Gusev, M.N. Kondaurov, V.R. Kozak, A.S. Medvedko, V.V. Parkhomchuk, D.N. Pureskin, A.A. Putmakov, V.B. Reva, D.V. Senkov
BINP SB RAS, Novosibirsk, Russia

The electron cooler of a 2 MEV for COSY storage ring FZJ is assembling in BINP. The high energy electron beam produced by the electrostatic accelerating column. The power supply for accelerating column of the electron cooling system consists of 33 distributed by the accelerating potential controlled modules. Each module has precision controlled voltage source 60 kV 1mA, and additional supply for the magnetic system solenoid with a maximal current of 2.5 amperes. All the system controlled through wireless ZIGBEE network. The report presents the structure of the power system, its parameters and the results of tests carried out in BINP.

WEPPC042

Design Parameters of Biperiodic Accelerating Structure for Medical Linac with Widely Variable Energy

injection, coupling, simulation, medical-accelerators

529

Yu. Zuev, M.A. Kalinichenko, V.V. Terentiev
NIIEFA, St. Petersburg, Russia

Results on the simulation of beam dynamics in an accelerating structure with regulation of particle energy from 6 to 21 MeV are presented. The structure operates in the standing wave mode, consists of two weakly coupled substructures and resonates at closed frequencies f1 , f2. In-phased electromagnetic field oscillations take place in the substructures at frequency f1, whereas anti-phased oscillations occur at frequency f2. Main features of the accelerating structure are electronic control of the beam energy and possibility to form narrow energy spread at both frequencies.

WEPPC044

Positron Annihilation Spectroscopy at LEPTA Facility

positron, background, vacuum, lattice

532

P. Horodek, I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia
A.G. Kobets, V.I. Lokhmatov, V. Pavlov, A.Yu. Rudakov, A.A. Sidorin, S. Yakovenko
JINR, Dubna, Moscow Region, Russia

The Low Energy Positron Toroidal Accumulator (LEPTA) at JINR proposed for generation of positronium in flight can be used for positron annihilation spectroscopy (PAS). The positron injector of the LEPTA facility can generate continuous slow positron beam of the intensity up to 1*10⁷ s⁻¹ at the energy in the range of a few eV to 100 keV and width of the spectrum 1-2 eV. The injector is based on radioactive 22Na isotope. The solid neon is used as moderator to generate monochromatic positron beam. It is known that positrons implanted into the matter can localize the defects of structure as vacancies, clusters of vacancies and pores. Observation of gamma quanta (511 keV) from annihilation process allows to obtain the information about the presence, concentration and kind of defects. Nowadays, the experiments with the use of slow positrons beam instead of standard isotopic sources are more popular. The progress in the creation of Doppler broadening of annihilation gamma line spectrometer will be presented here. In the simplest version, it is a set composed of a HpGe detector, a preampliefier, an ampliefier, a MC analyzer and a PC computer. This combination makes possible the observation of changes in 511 keV gamma line, calculation characteristics for PAS parameters and in effect to deduce about defects concentration and their chemical surrounding.

WEPPC046

RF Photoinjector Parameters Optimization

coupling, vacuum, impedance, radiation

535

T.V. Bondarenko, S.M. Polozov
MEPhI, Moscow, Russia

Sources of high-power electromagnetic radiation in THz band are becoming promising as a new method of a low activation introscopy. Research and development of accelerating RF photoinjector for THz source are reported. The photoinjector is based on disk loaded waveguide (DLW). Photoinjector consists of two accelerating structures: widespread 1.6 cell DLW structure and travelling wave resonator structure based on 8 cells traveling wave accelerating structure. The resonant models of these structures and the structures with power ports were designed. Electrodynamics characteristics and electric field distribution for all models were acquired. Electrodynamics models were tuned to the resonant frequency of 3000 MHz. Magnetic field coupling between cells of accelerating structure and optimization of the diaphragms sizes were analyzed to enlarge the structures efficiency. Diaphragms windows profiles were optimized to decrease the overvoltage on the windows edges and to eliminate the breakdown possibility.

WEPPC048

Status of 1 MeV 25 kW CW Electron Accelerator

klystron, gun, vacuum, high-voltage

541

D.S. Yurov
MSU SINP, Moscow, Russia
A.S. Alimov, B.S. Ishkanov, N.I. Pakhomov, V.P. Sakharov, V.I. Shvedunov
MSU, Moscow, Russia

Status of 1 MeV 25 kW continuous wave (CW) linear electron accelerator for radiation technologies which is under construction at SINP MSU is described. Driven by 50 kW CW klystron on-axis coupled standing wave accelerating structure was optimized, manufactured and tuned. The results of accelerating structure measurements and tuning are presented. RF system, high voltage, vacuum and control systems of the accelerator are described. New magnetic system forming output beam irradiation field is also described.

WEPPC052

Beam Scanning System of Linear Accelerator for Radiation Processing

extraction, controls, beam-losses, vacuum

547

M.I. Demsky, V.V. Krotov, D.E. Trifonov
CORAD Ltd., St. Petersburg, Russia

The report represents a beam scanning system for irradiation of opposite sides of the boxes during one pass. This beam scanning system contains the well-known scanning system composed of scanning magnet and vacuum chamber with the beam extraction window covered by titanium foil. The bending magnet, which is located on the edge of this vacuum chamber, turns the electron beam to the metallic pipe, connected with the vacuum chamber. The metallic pipe goes sideways from the irradiated boxes and is connected with the second vacuum chamber, located inside of a 180 degrees bending magnet. Electrons are turning on 180 degrees and scanning along the opposite side of the boxes due to the hyperbolic shape of the current in a coil of the 180 degrees bending magnet. Therefore, electrons are scanning along one side of the box, then round the box sideway through the metallic pipe and scanning along the opposite side of this box after turning 180 degrees. The full cycle of the scanning can be repeated up to 6 times per second. The experimental results of this system operation with 10 MeV, 12 kW electron beam are given in this report.

WEPPC053

The IDK-6/9MeV Linear Electron Accelerator and its Application in the Customs Inspection System

controls, cathode, interlocks, radiation

549

V.P. Malyshev, B.O. Bolshakov, P.O. Klinovskiy, K.V. Kotenko, A.V. Sidorov, V. Smekalkin
NIIEFA, St. Petersburg, Russia

A linear electron accelerator IDK-6/9МeV has been designed for operation as a source of ionizing radiation in a customs inspection system intended for inspection of large-scale cargos. The main operating mode of the accelerator is the X-ray mode with an energy of 6 MeV, which ensures the penetrability (for steel) more than 300 mm. The operating mode of the accelerator can be quickly changed for 9 Mev, which allows the objects under study to be discriminated based on the organics/non-organics criterion using the "two energies" method. A triode electron source with cathode and grid modulators is applied in the accelerator. A system of collimators located at the output of the accelerating device ensures shaping of an X-ray beam fan-shaped in the vertical plane with an opening angle of 460 directed towards the detector line. The accelerator is equipped with a computerized system of protective interlocks and control, which makes possible its operation both in the setting mode and as a component of the whole customs inspection system.

WEPPC054

Updating of the "Electron-3M2" Accelerator in the Line for Radiation Curing of Polymer Coatings

radiation, shielding, extraction, high-voltage

551

V.P. Ovchinnikov, O.V. Borisov, I.V. Druzgalckiy, V.V. Koltsov, V.P. Maznev, A.I. Seleznev, M.P. Svinin
NIIEFA, St. Petersburg, Russia

In 2008-2009, NIIEFA specialists performed works on updating the "ELECTRON-3M" accelerator previously delivered to FSUE "Admiralty Shipyards" to be operated on the line for radiation curing of polymer coatings. After obtaining nominal parameters on the updated accelerator "ELECTRON-3M2", the intensity of bremsstrahlung radiation on the surface of the accelerator shielding was measured; the obtained data confirmed the machine compliance with corresponding norms and regulation documents. Measurements of parameters of the accelerator electron radiation field have demonstrated that the uniformity coefficient of the beam current linear density is 5%, and the symmetry coefficient amounts to 1%. The beam current and accelerating voltage instability during one hour of operation does not exceed 1%. After the updating, the lifetime of the accelerator will be not less than 10 years.

WEPPC056

Improving of Uniformity of the Electron-Beam Treatment of Materials by ELV Accelerators

radiation, controls, scattering, focusing

557

D.A. Kogut, S. Fadeev, N.K. Kuksanov
BINP SB RAS, Novosibirsk, Russia

The problem of the absorbed dose distribution during the EB treatment by ELV accelerator is considered. The value of the absorbed dose is determined by the speed of scanning electron beam along the accelerator exit window (i.e. the movement across the conveyor). It is determined both by the shape of scanning current and by the geometry of scanning magnets. A simple way to improve the dose distribution near the edges of the extraction device of accelerator is suggested. It allows to provide the non-uniformity less 4%.

WEPPC059

Electron Beam Image Visual Monitoring

monitoring, target, linac, gun

563

V.N. Boriskin, I.A. Chertishchev, N.G. Reshetnyak, K. Romanovsky, V.A. Shevchenko, I.N. Shlyakhov, A.Eh. Tenishev, V.L. Uvarov, V. Zakutin
NSC/KIPT, Kharkov, Ukraine

The system for visual monitoring of the electron beam features was developed and implemented. This system is based on registration of optical radiation, which is generated under object-beam interaction. The system comprises image transferring channel, remote-controlled digital photo-camera, connected with PC by USB-interface as well as proper software. The images obtained give information on the beam density distribution over the surface of the object being irradiated. 100 KeV and 10 MeV electron beams was researched.

WEPPD002

Simulations and Design of THz Wiggler for 15-40 MeV FEL

wiggler, simulation, radiation, power-supply

569

E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov
JINR, Dubna, Moscow Region, Russia

The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm². The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 10² mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.

WEPPD003

Diagnostic Technique with Femtosecond Resolution Applied for FEL Electron Bunches

radiation, undulator, photon, FEL

572

E. Syresin, A.Yu. Grebentsov, R.S. Makarov, N.A. Morozov, M.V. Yurkov
JINR, Dubna, Moscow Region, Russia
O.I. Brovko, A.V. Shabunov
JINR/VBLHEP, Moscow, Russia

Diagnostic technique applied for FEL ultrashort electron bunches is developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort electron bunches are based on calorimetric measurements and detection of undulator radiation. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The pump probe experiments with VUV and FIR undulators provide the bunch profile measurements with resolution of several femtosecond. The MCP based radiation detectors are effectively used at FLASH for VUV pulse energy measurements. The new three MCP detectors operated in X-ray range are under development now in JINR for SASE1-SASE 3 XFEL.

WEPPD004

Longitudinal Stability of ERL with Two Accelerating RF Structures

linac, RF-structure, cavity, simulation

575

Ya.V. Getmanov, O.A. Shevchenko
BINP SB RAS, Novosibirsk, Russia
N. Vinokurov
KAERI, Daejon, Republic of Korea

Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper

WEPPD009

Measurement of Speed of Light Emitted by Ultrarelativistic Source

radiation, synchrotron, synchrotron-radiation, cavity

584

A. Stirin, P. Aleksandrov, V. Korchuganov
NRC, Moscow, Russia
E.B. Aleksandrov
IOFFE, St. Petersburg, Russia
V.S. Zapasskii
Saint-Petersburg State University, Saint-Petersburg, Russia

Funding: The work was supported by the Russian Fundation for Basic Research under Project No.11-02-00538-а.
The paper focuses on the results of experiments on direct measurement of speed of the light emitted by an ultrarelativistic source. The source of synchrotron radiation (SR), Siberia-1 electron storage ring at Kurchatov Institute, was used as a pulsed source of light. Experiments were made on the visible part of the SR emitted by ultrarelativistic electron bunch moving along a curved trajectory in the magnetic field of the bending magnet. The measured value of speed of the light pulse in vacuum coincided with the tabular value of the light speed within 0.5%. Results of the measurements support the second postulate of Einstein's special theory of relativity about independence of speed of light from the source velocity. The paper contains schematic of the experiment, description of its components, main parameters of Siberia-1 electron storage ring and electron bunches. Description of the method of direct measurement of light speed as well as experimental oscillograms and calculation data are also presented.

WEPPD013

Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery

cavity, linac, photon, FEL

593

V.G. Kurakin, P.V. Kurakin
LPI, Moscow, Russia

In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.

WEPPD023

Dubna-Minsk Activity on the Development of 1.3 GHz Superconducting Single-Cell RF-cavity

cavity, niobium, cryogenics, vacuum

602

N.S. Azaryan, Ju. Boudagov, D.L. Demin, G. Shirkov
JINR, Dubna, Moscow Region, Russia
M.A. Baturitsky
NC PHEP BSU, Minsk, Belarus
S.E. Demyanov, E.Yu. Kaniukov
Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus
V.A. Karpovich, N.V. Liubetsky
BSU, Minsk, Belarus
R.D. Kephart, L. Ristori
Fermilab, Batavia, USA
S.V. Kolosov, A.A. Kurayev, A.K. Sinitsyn
Belarus State University of Informatics and Radioelectronics (BSUIR), Minsk, Belarus
S.I. Maximov, V.N. Rodionova
Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, S.V. Yurevich, A.Yu. Zhuravsky
Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus

In 2011 Dubna-Minsk collaboration started an activity on the development and manufacture the series of superconducting niobium cavities in the enterprises in Belarus. First results of this work are presented. Simulation code was developed to compute EM characteristics, and to calculate the shape and geometric dimensions of SC niobium RF-cavity taking into account higher order oscillations modes. The calculations of a single-cell and 9-cell cavity were made: the found ratio of the maximum electric field on the cavity axis to an average accelerating field is 2 within 1%; the found geometric factor equals 283 Ohm. Half-cells will be made by hydraulic deep drawing and welded by electron-beam (EBW). A stamping tool for hydraulic deep drawing of the half-cells and a set of technological tools for probing of EBW of two half-cells have been designed. Mechanical properties of niobium and model material (Cu, Al) were investigated. Cryogenic system for low temperature RF tests of the SC single-cell cavity was successfully tested at 4.2 K. Coupling device for RF measurement of the single-cell SC niobium cavity was synthesized and manufactured – the measured standing wave ratio is about 1.01-1.07. Warm RF tests with etalon single-cell cavity were made: fundamental frequency – 1.273 GHz, quality factor (warm) – 28·10³.

WEPPD028

Beam Position Monitor System for 2 MeV Electron Cooler for COSY

proton, controls, gun, high-voltage

608

E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, V.B. Reva, E. Shubin, D.N. Skorobogatov
BINP SB RAS, Novosibirsk, Russia

The 2 MEV electron cooler for COSY storage ring FZJ is assembling in BINP. Beam position monitor (BPM) system for orbit measurements has been developed and fabricated at BINP. The system contains 2 BPMs inside the cooling section and 10 BPMs in transport channels Continuous electron beam is modulated with a 3 MHz signal for capability to get signals from pickup electrodes. The beam current modulation can be varied in the range of 0.3-1.5 mA. The BPMs inside the cooling section can measure both electron and proton beams. It is achieved by means of switching the reference signals inside the BPM electronics. The BPM electronics provides highly precise beam position measurements. Relative position measurement error doesn’t exceed 1 micron. Design features of the BPM system, its parameters and testing results are presented in this paper.

WEPPD030

New Beam Position Monitor Electronics For VEPP-5 Preinjector

positron, linac, background, injection

614

A.S. Styuf, G.V. Karpov
BINP SB RAS, Novosibirsk, Russia

A new beam position monitor (BPM) electronics has been designed, manufactured and tested in VEPP-5 preinjector. Preinjector BPM system measures position of single electron and positron bunches for each injection cycle. New BPM electronics provides more high sensitivity with respect to existing one developed in 2004. The system can measure the position of bunches with 10⁸ - 10¹⁰ particles per bunch. The resolution of measurements of single bunch is better than 10 mkm for 10¹⁰ particles per bunch. The features of BPM electronics design, the main parameters and results obtained in VEPP-5 preinjector are presented.

WEPPD039

Development of the New Control Systems for JINR e^- Linac Accelerator Test-Bench

controls, radiation, gun, cathode

626

M.A. Nozdrin, N. Balalykin, V. Minashkin, V.Y. Schegolev, G. Shirkov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

Linear accelerator test-bench in the Joint Institute for Nuclear Research is based on the part of the accelerator complex which was transferred to the possession of JINR by the National Institute for Subatomic Physics (NIKHEF, Amsterdam). Analysis of the transferred accelerator equipment has shown that full re-engineering is required for its control systems; all other systems are in good condition and have considerable endurance. Results of development and creation of the Electron Gun Control System (EGCS), Video and Analog Signals Control System (VASCS) and Automatic System of Radiation Safety Control (ASRSC) are presented. These systems allowed achieving a commissioning of the first accelerator section of the bench with current of 3 mA in 1 us pulse and at beam energy of 23-25 MeV.

WEPPD040

Precision Thermostatic Control for LUE-200 Accelerator Section

controls, linac, neutron, diagnostics

629

V.N. Zamriy, A.P. Sumbaev
JINR, Dubna, Moscow Region, Russia

According to the design of the IREN facility the system of thermostatting of LUE-200 linac sections is developed. Rated values of linac beam power depend basically on a microwave power input and stability of the phase. The latter is sustained by means of thermostatic control for the sections subject to the powerful microwave warming-up. Demanded both high accuracy of stabilization and low settling time of temperature for linac modes define development of the control system. The precise system of thermostatic control in which composition the programmable PID-controller and the platinum resistance thermometer with accuracy of 0.1%, and also thyristor regulators of heating power up to 15 kVА has been adapted for modes of the IREN microwave facility. The advanced system allows to control both power of heating and a flow of cooling water. The system supervises and changes over modes of the accelerated warming-up and controllable heating and cooling. Both high accuracy of the thermostat and energy saving at a smooth settling of temperature and at the subsequent long-term thermostabilization are substantially improved. Essential speed-up of a preliminary warming-up of the thermostat also is attained.

WEPPD047

The Optimization of RF Deflector Input Power Coupler

coupling, emittance, simulation, diagnostics

650

A.Yu. Smirnov, O.A. Adonev, N.P. Sobenin
MEPhI, Moscow, Russia
A.A. Zavadtsev
Nano, Moscow, Russia

This paper concerns the investigation of different types of input power cell for S-band RF electron deflector. This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-like wave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on its length and has to provide high enough deflecting potential to a particle during its flight time it is significant to increase the transversal field strength in coupling cell or to shorten it so that the deflecting potential remains constant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the same length equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper different length are considered and numerically simulated in order to choose the best one.

WEPPD053

New Electron Beam Reference Orbit Measurement System at Dedicated Synchrotron Radiation Light Source SIBERIA-2

brilliance, controls, radiation, synchrotron

662

Y.A. Fomin, V. Korchuganov, A.G. Valentinov
NRC, Moscow, Russia
R. Hrovatin, P. Leban
I-Tech, Solkan, Slovenia
N.I. Moseiko
RRC, Moscow, Russia

The paper focuses on the project of the electron beam closed orbit measurement system at SR source SIBERIA-2 realizing at present time at Kurchatov Institute. The main purpose of new closed orbit measurement system creation is an improvement of the electron beam diagnostic system at storage ring. In addition, it will be a part of fast feedback system which will damp the distortions of the closed orbit at SIBERIA-2. This system provides continuous measurements of the electron beam closed orbit during storing, ramping and operation for users. Besides, with the help of the system it is possible to carry out turn-by-turn measurements of the electron beam trajectory during injection process. The paper describes the new orbit measurement system, the principle of operation and its technical characteristics.

WEPPD057

Commissioning of New Diagnostic Devices at PITZ

emittance, booster, cavity, quadrupole

674

D. Malyutin, M. Krasilnikov, J. Meissner, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
K. Kusoljariyakul, S. Rimjaem
Chiang Mai University, Chiang Mai, Thailand

The Photo Injector Test facility at DESY, Zeuthen site (PITZ) is the test stand of the electron source for the European X-ray Free Electron Laser (XFEL). The main goal of the facility is the detailed characterization of the electron bunch parameters produced by the RF photo-cathode gun. Characterization of the bunch longitudinal properties such as bunch length or longitudinal phase space earlier was done using a streak camera, which measures the Cherenkov light produced by electron bunches passing through aerogel radiators. Recently, a Transverse Deflecting Structure (TDS) and a Second High Energy Dispersive Arm (HEDA2) were installed in the PITZ beamline. They will enable time resolved measurements of the electron bunch with much better time resolution than the streak camera system. The first results of the commissioning of the HEDA2 section at PITZ are presented in this contribution.

WEPPD059

AIRIX Measurement Chain Optimization For Electron Beam Dynamic and Dimensional Characteristics Analysis

emittance, target, beam-transport, extraction

677

F. Poulet, V. Bernigaud, H. Dzitko, J.K. Kranzmann, C. Noël, O. Pierret
CEA, Pontfaverger-Moronvilliers, France
C. Chollet
CEA/DAM/DIF, Arpajon, France

AIRIX is a linear accelerator dedicated to X-ray flash radiography at CEA's hydrotest facility. It has been designed to generate an intense X-ray pulse using a 2 kA, 19 MeV and 60 ns electron beam. The electron beam transport in the accelerator is insured by the knowledge of the dynamic and dimensional characteristics of the beam created downstream the injector. These characteristics are assessed from a measurement chain, established by adapted optics and an intensified camera, aiming at observing the Cerenkov radiation produced during the interaction of electrons with a mylar target placed in the beam. This paper deals with the characterization, and comparison with the previous model, of a new intensified camera which was experimentally tested on AIRIX during an injector characterization campaign. This allowed defining profile and emittance beam characteristics. The obtained results are promising and revealed very interesting properties in particular in term of dynamic, temporal resolution, linearity and signal-to-noise ratio.

WEPPD060

Distributed Control System for an Industrial Electron Beam Accelerator

controls, vacuum, high-voltage, gun

680

V. Sharma
BARC-EBC, Mumbai, India

Funding: Bhabha Atomic Research Center, Trombay, Mumbai
A 3MeV DC Electron beam accelerator has been developed at Electron Beam Center, BARC, Mumbai, India. PLC based distributed control system has been incorporated for the control of the accelerator. A touch screen user interface (HMI) based control system provides a single point control of the whole accelerator. The accelerator operation data is stored in the memory Flash card of the HMI. The Accelerator has many subsystems such as scan magnet supply to scan the electron beam, Chiller unit to supply chilled water to the accelerator for cooling,vacuum system to maintain the vacuum inside the beam line,high voltage unit to generate the EHV for electron acceleration and other support system. All the above subsystems have to be controlled from the central location in order to operate the accelerator safely. Each of the subsystem has been controlled by a PLC controller independently and their control and safety is ensured by the program logic algorithm. After each of the subsystem has been tested separately all the PLCs are connected to the central PLC on modbus RS232 and modbus TCP-IP. The main central PLC has been programmed to fetch the data from individual subsystems PLCs and provide control and monitoring of the accelerator. In auto mode of operation setting the accelerator parameters operates all the subsystems automatically.

WEPPD061

Design and Simulation of a New Faraday Cup for ES-200 Electrostatic Accelerator

proton, simulation, ion, high-voltage

682

E.E. Ebrahimibasabi, S.A.H. Feghhi, M. Khorsandi
sbu, Tehran, Iran

Faraday Cups have been used as diagnostic tools to measure the charged particle beam current directly. Up to now, different designs have been introduced for this purpose. In this work a new design of Faraday Cup for ES-200 accelerator, a proton electrostatic accelerator which is installed at Shahid Beheshti University, has been performed. FC's dimensions and desirable material were considered Based on the ES-200 beam characteristics (maximum energy of 200 keV and maximum current of 500 mkA). Thickness and dimensions of FC has been calculated by SRIM code according to the range of proton and induced electrons. MCNPX Monte Carlo code was used in order to simulate the angular dispersion and flux of back scattered and secondary electrons that are produced in collision of energetic protons. The Appropriate FC geometry specifications have been calculated by using MCNPX code. Final Simulation and validation of the FC performance has been done by using CST Studio package. In addition, the heat power generated due to proton collision with FC has been calculated analytically and the required cooling system has been designed by ANSYS. Results showed that the new designed Faraday Cup has a good performance to measure the proton beam produced by ES-200 ion accelerator.