RUPAC2012 - List of Keywords (injection)

Paper	Title	Other Keywords	Page
MOZCH01	Beam Instability Phenomena Observed at HIRFL-CSR in the Presence of Electron Cooler	ion, electron, 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]

TUACH02	Long Term Beam Dynamics Simulation with the BETACOOL Code	electron, ion, 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]

TUCCH02	Beam Dynamics Investigations for 433 MHz RFQ Accelerator	rfq, emittance, focusing, ion	82
	Y.A. Svistunov NIIEFA, St. Petersburg, Russia A.P. Durkin MRTI RAS, Moscow, Russia A.D. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia
	Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.
	Slides TUCCH02 [0.642 MB]

WEBOR02	Some Design Features of the 80 MeV H⁻ Isochronous Cyclotron at Gatchina	cyclotron, focusing, extraction, vacuum	109
	G.A. Riabov, S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, Yu.T. Mironov, B.B. Tokarev PNPI, Gatchina, Leningrad District, Russia V.G. Mudrolyubov NIIEFA, St. Petersburg, Russia
	To minimize the expenditures while designing the cyclotron an attempt was made to use at most the existing synchrocyclotron infrastructure, i.e. the building with the radiation shielding, the bridge crane for 30 tones, the electric power, water cooling, ventilation systems, etc. The iron yoke of the existing synchrocyclotron magnet model is used for a magnet system. The special magnetic structure with very low value of the flatter 0.025 and extremely high spiral angle about 60 degree in the radii range from 0.3 up to 0.9 m was developed to provide acceleration of H-minus ions up to energy 80 MeV in the magnet with extraction radius 0.9 m. Special attention was paid to thoroughly study effects of the highly spiraled structure: decrease of the flatter with introduction of the spiral angle, discrepancy between the magnetic and geometrical spiral angles, the spiral angle inefficiency in the cyclotron central region.
	Slides WEBOR02 [1.952 MB]

WEZCH01	ITEP-TWAC Renewal and Upgrading Program	ion, proton, acceleration, vacuum	112
	N.N. Alexeev, P.N. Alekseev, V. Andreev, A. Balabaev, A.I. Balabin, V.N. Balanutsa, A. Golubev, M.M. Kats, V.I. Nikolaev, A.S. Ryabtsev, Yu.A. Satov, V.A. Schegolev, B.Y. Sharkov, A. Shumshurov, V. Stolbunov, V.P. Zavodov ITEP, Moscow, Russia
	The ITEP-TWAC facility has been put out of operation this year as a result of some equipment damage by the fire, so the program of machine renewal and its equipment upgrading for accelerated beams parameters improvement and experimental area extension is elaborated. Main items of this program and status of machine restoration activity are presented.
	Slides WEZCH01 [3.050 MB]

THCCH02	Characteristics of the Model of Linear Accelerator Based on Parallel Coupled Accelerating Structure with Beam Loading	electron, beam-loading, cavity, 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]

FRYOR01	Recent Development in ECR Ion Sources at FLNR JINR	ion, ion-source, cyclotron, extraction	203
	S.L. Bogomolov, V.B. Bekhterev, A.A. Efremov, B. Gikal, G.G. Gulbekyan, Yu.K. Kostyukhov, N. Lebedev, V.N. Loginov, Yu. Yazvitsky JINR, Dubna, Moscow Region, Russia
	In the Flerov Laboratory of Nuclear Reactions (JINR) the development of ion sources based on the plasma electrons heating at the frequency of electron cyclotron resonance (ECR) is stimulated by the necessity of the accelerator complex (U-400, U-400M and CI-100 cyclotrons) upgrading as well as by creation of the new high current cyclotrons for basic and applied research. Six ECR ion sources have been operated in the Flerov Laboratory of Nuclear Reactions (JINR) supplying various ion species for the U400 and U400M cyclotrons correspondingly for experiments on the synthesis of heavy and exotic nuclei using ion beams of stable and radioactive isotopes, for solid state physics experiments and polymer membrane fabrication. In this paper the new development concerned with modernization of ECR4M ion source, development of the new superconducting ion source DECRIS-SC2 and creation of the DECRIS-5 ion source for the DC-110 cyclotron complex will be presented.
	Slides FRYOR01 [5.754 MB]

FRYOR02	Status Report on Physics Research and Technology Developments of Electron String Ion Sources of Multicharged Ions	ion, electron, ion-source, 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).

MOPPA005	Laser-Wakefield Acceleration with External Bunch Injection at REGAE	plasma, laser, electron, emittance	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.

TUPPB003	Progress in NICA Booster Design	booster, extraction, kicker, lattice	310
	A.S. Valkovich, O.S. Kozlov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	New collider facility NICA * is envisioned to be built at The Joint Institute of Nuclear Research. The work presented explores issues of correction system of the Booster Synchrotron. The optimal arrangement of Beam Position Monitors and Orbit Correctors along the ring was investigated in order to achieve decent quality of the orbit correction. The SVD properties of the orbit correction system are presented. Optimal arrangement of the sextupole lenses for the correction of chromaticity of the ring was obtained. The reduction of the dynamical aperture due to the presence of the sextupole lenses was minimized by means of proper choice of betatron phase advances between the lenses. * Design and construction of Nuclotron-based Ion Collider fAcility (NICA), Conceptual design report, Editors I.Meshkov, A.Sidorin, JINR, Dubna, 2008

TUPPB005	LEPTA Project: Towards Positronium	positron, electron, focusing, gun	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.

TUPPB020	Mathematical Model of Beam Dynamics Optimization in Traveling Wave	controls, rfq, acceleration, resonance	355
	A.D. Ovsyannikov, A.Yu. Shirokolobov St. Petersburg State University, St. Petersburg, Russia
	In works by B.I. Bondarev, A.P. Durkin, A.D. Ovsyannikov mathematical model of optimization of of charged particles dynamics in RFQ accelerators was proposed. In this paper a new mathematical model of optimization of particle dynamics in traveling wave is considered. Joint optimization model of program and disturbed motions is investigated.

TUPPB024	Development of the Object-oriented Program in C ++ for Simulation of Beam Dynamics in Accelerator Injection Systems	simulation, controls, emittance, focusing	364
	S.A. Kozynchenko St. Petersburg State University, St. Petersburg, Russia
	At present, more and more attention is paid to the design and creation of accelerator systems for precision beams. Their injection systems in many aspects determine the output characteristics of the beam, so the questions of the design of such systems are of great importance. In such cases both simulation and optimization of beam dynamics in electromagnetic fields close to real may be necessary. In this paper the program for simulation and optimization of beam dynamics in injection systems is considered, which at the same time allows the choice of parameters of the accelerating-focusing system. This permits designing the injection system during optimization process, taking into account the required output characteristics of the beam. The given program is based on Win 32 API dialog boxes and is developed in standard C++, using parallel programming tools based on the MPI-1.

TUPPB054	High Current Ion Sources for the FAIR Accelerator Facility	ion, ion-source, plasma, extraction	436
	R. Hollinger, A. Adonin, W.A. Barth, J. Pfister GSI, Darmstadt, Germany N. Chauvin CEA/DSM/IRFU, France
	Vacuum Arc Ion Sources and filament driven Multi Cusp Ion Sources are used for the production of high current ion beams of a variety of metallic and gaseous ions at the GSI accelerator facility. For the future project FAIR (Facility of Antiproton and Ion Research) it is foreseen to provide in addition a high current proton beam and an exclusive uranium beam from two new ion source injectors. The contribution gives an overview of the performance of the existing high current injector and presents the challenges for the future injectors for proton and uranium production.

WEPPC017	Pulse Generator for the Beam Injection System of NICA Collider	kicker, power-supply, collider, pulsed-power	481
	A.A. Fateev, E.V. Gorbachev, N.I. Lebedev JINR, Dubna, Moscow Region, Russia
	The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPC042	Design Parameters of Biperiodic Accelerating Structure for Medical Linac with Widely Variable Energy	electron, 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.

WEPPD008	Energy Ramping at Siberia-2	betatron, quadrupole, power-supply, resonance	581
	A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov NRC, Moscow, Russia
	Siberia-2 storage ring has great difference between injection energy 0.45 GeV and working energy 2.5 GeV. Beam lifetime at injection energy is equal to approximately 1 hour. In order to minimize beam losses of the stored beam it is necessary to accelerate energy ramping process. It is not very simple because power supplies of bending magnets, quadrupole lenses and sextupoles have different response time and behavior after changes in regulated current level. Magnetic elements are manufactured from non-laminated iron. It leads to slower field/gradient increasing at high current values. Complicated algorithm with 9 intermediate regimes (collections of power supplies' settings) was developed to produce fast and efficient energy ramping. First, correction of closed orbit, betatron tunes and chromaticity is accomplished in each regime in static conditions. Special file is used to provide acceleration or deceleration of power supplies in dynamic conditions. This scheme allows to compensate betatron tune shifts during energy ramping. Power supplies are not stopped on intermediate regimes; speed of current changing is continuous function of time. This algorithm allowed decreasing ramping time down to 2 minutes 40 seconds. Beam losses are not exceeding 2 – 3%; betatron tune shifts as a rule are lower than 0.01. The algorithm can easily be modified to stop in any intermediate regime.

WEPPD010	Study of Two Cavities Accelerating Module at SR Source Siberia-2	cavity, impedance, scattering, beam-loading	587
	V.I. Moiseev, V. Korchuganov, A.S. Smygacheva, A. Vernov NRC, Moscow, Russia
	SR source Siberia-2 RF system includes an accelerating module consisting of two 181 MHz cavities powered by one amplifier. Some problem occured now is the accelerating voltage instubility under high beam currents conditions. The phase shift between the voltages at cavities causes the asymmetry in beam loading and detuning of cavities. To study the performances of accelerating module, the analytical description has been developed. The whole system can be characterized by seven parameters. These base parameters give the relations of voltages and currents in system. Measurements determine the real values of the base parameters. Set of non linear equations recived can be reduced to the voltages and currents in system as the functions of beam current and energy. The results can be applied to injection and ramping in Siberia-2.

WEPPD030	New Beam Position Monitor Electronics For VEPP-5 Preinjector	positron, electron, linac, background	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.

WEPPD041	Acceleration of Low Charge Krypton Ions in the CYTRACK Cyclotron	ion, cyclotron, acceleration, extraction	632
	G.A. Karamysheva, Yu.N. Denisov, O. Karamyshev JINR, Dubna, Moscow Region, Russia
	The basic results of numeric simulations of Krypton ion motion with decreased charge in cyclotron CYTRACK are presented. Cyclotron CYTRACK is the first world industrial cyclotron dedicated to produce the track membranes. Computer modeling confirms the possibility of ion acceleration in the formed magnetic field with increase of the magnetic field level by 1.6% on the 6 harmonic of the accelerating system. Beam energy will be sufficient for exposure of the film with thickness 10 um.

WEPPD045	Optimization of the Detector Geometry and Data Processing Algorithms for FAIR CR BPMs	simulation, antiproton, monitoring, impedance	644
	A.Y. Orlov, S.V. Barabin, T. Kulevoy, D.A. Liakin ITEP, Moscow, Russia
	A beam diagnostic is an important part of all FAIR accelerators and storage rings. A small flux of antiprotons in the collector ring CR (10⁸ particles in a store ring) as well as dominated at first turns p-meson component of a beam require careful design for all elements of the beam position monitoring system. To increase a BPM resolution and sensitivity we propose a compact multi-electrode design of the position detector, matched low-noise electronics in connection with dedicated enhanced digital data processing algorithms. Here we present a comprehensive set of aspects of a preliminary design of the BPM system for FAIR CR.

Paper

Title

Other Keywords

Page

MOZCH01

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

ion, electron, 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]

TUACH02

Long Term Beam Dynamics Simulation with the BETACOOL Code

electron, ion, 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]

TUCCH02

Beam Dynamics Investigations for 433 MHz RFQ Accelerator

rfq, emittance, focusing, ion

82

Y.A. Svistunov
NIIEFA, St. Petersburg, Russia
A.P. Durkin
MRTI RAS, Moscow, Russia
A.D. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia

Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.

Slides TUCCH02 [0.642 MB]

WEBOR02

Some Design Features of the 80 MeV H⁻ Isochronous Cyclotron at Gatchina

cyclotron, focusing, extraction, vacuum

109

G.A. Riabov, S.A. Artamonov, E.M. Ivanov, G.F. Mikheev, Yu.T. Mironov, B.B. Tokarev
PNPI, Gatchina, Leningrad District, Russia
V.G. Mudrolyubov
NIIEFA, St. Petersburg, Russia

To minimize the expenditures while designing the cyclotron an attempt was made to use at most the existing synchrocyclotron infrastructure, i.e. the building with the radiation shielding, the bridge crane for 30 tones, the electric power, water cooling, ventilation systems, etc. The iron yoke of the existing synchrocyclotron magnet model is used for a magnet system. The special magnetic structure with very low value of the flatter 0.025 and extremely high spiral angle about 60 degree in the radii range from 0.3 up to 0.9 m was developed to provide acceleration of H-minus ions up to energy 80 MeV in the magnet with extraction radius 0.9 m. Special attention was paid to thoroughly study effects of the highly spiraled structure: decrease of the flatter with introduction of the spiral angle, discrepancy between the magnetic and geometrical spiral angles, the spiral angle inefficiency in the cyclotron central region.

Slides WEBOR02 [1.952 MB]

WEZCH01

ITEP-TWAC Renewal and Upgrading Program

ion, proton, acceleration, vacuum

112

N.N. Alexeev, P.N. Alekseev, V. Andreev, A. Balabaev, A.I. Balabin, V.N. Balanutsa, A. Golubev, M.M. Kats, V.I. Nikolaev, A.S. Ryabtsev, Yu.A. Satov, V.A. Schegolev, B.Y. Sharkov, A. Shumshurov, V. Stolbunov, V.P. Zavodov
ITEP, Moscow, Russia

The ITEP-TWAC facility has been put out of operation this year as a result of some equipment damage by the fire, so the program of machine renewal and its equipment upgrading for accelerated beams parameters improvement and experimental area extension is elaborated. Main items of this program and status of machine restoration activity are presented.

Slides WEZCH01 [3.050 MB]

THCCH02

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

electron, beam-loading, cavity, 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]

FRYOR01

Recent Development in ECR Ion Sources at FLNR JINR

ion, ion-source, cyclotron, extraction

203

S.L. Bogomolov, V.B. Bekhterev, A.A. Efremov, B. Gikal, G.G. Gulbekyan, Yu.K. Kostyukhov, N. Lebedev, V.N. Loginov, Yu. Yazvitsky
JINR, Dubna, Moscow Region, Russia

In the Flerov Laboratory of Nuclear Reactions (JINR) the development of ion sources based on the plasma electrons heating at the frequency of electron cyclotron resonance (ECR) is stimulated by the necessity of the accelerator complex (U-400, U-400M and CI-100 cyclotrons) upgrading as well as by creation of the new high current cyclotrons for basic and applied research. Six ECR ion sources have been operated in the Flerov Laboratory of Nuclear Reactions (JINR) supplying various ion species for the U400 and U400M cyclotrons correspondingly for experiments on the synthesis of heavy and exotic nuclei using ion beams of stable and radioactive isotopes, for solid state physics experiments and polymer membrane fabrication. In this paper the new development concerned with modernization of ECR4M ion source, development of the new superconducting ion source DECRIS-SC2 and creation of the DECRIS-5 ion source for the DC-110 cyclotron complex will be presented.

Slides FRYOR01 [5.754 MB]

FRYOR02

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

ion, electron, ion-source, 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).

MOPPA005

Laser-Wakefield Acceleration with External Bunch Injection at REGAE

plasma, laser, electron, emittance

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.

TUPPB003

Progress in NICA Booster Design

booster, extraction, kicker, lattice

310

A.S. Valkovich, O.S. Kozlov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

New collider facility NICA * is envisioned to be built at The Joint Institute of Nuclear Research. The work presented explores issues of correction system of the Booster Synchrotron. The optimal arrangement of Beam Position Monitors and Orbit Correctors along the ring was investigated in order to achieve decent quality of the orbit correction. The SVD properties of the orbit correction system are presented. Optimal arrangement of the sextupole lenses for the correction of chromaticity of the ring was obtained. The reduction of the dynamical aperture due to the presence of the sextupole lenses was minimized by means of proper choice of betatron phase advances between the lenses.
* Design and construction of Nuclotron-based Ion Collider fAcility (NICA), Conceptual design report, Editors I.Meshkov, A.Sidorin, JINR, Dubna, 2008

TUPPB005

LEPTA Project: Towards Positronium

positron, electron, focusing, gun

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.

TUPPB020

Mathematical Model of Beam Dynamics Optimization in Traveling Wave

controls, rfq, acceleration, resonance

355

A.D. Ovsyannikov, A.Yu. Shirokolobov
St. Petersburg State University, St. Petersburg, Russia

In works by B.I. Bondarev, A.P. Durkin, A.D. Ovsyannikov mathematical model of optimization of of charged particles dynamics in RFQ accelerators was proposed. In this paper a new mathematical model of optimization of particle dynamics in traveling wave is considered. Joint optimization model of program and disturbed motions is investigated.

TUPPB024

Development of the Object-oriented Program in C ++ for Simulation of Beam Dynamics in Accelerator Injection Systems

simulation, controls, emittance, focusing

364

S.A. Kozynchenko
St. Petersburg State University, St. Petersburg, Russia

At present, more and more attention is paid to the design and creation of accelerator systems for precision beams. Their injection systems in many aspects determine the output characteristics of the beam, so the questions of the design of such systems are of great importance. In such cases both simulation and optimization of beam dynamics in electromagnetic fields close to real may be necessary. In this paper the program for simulation and optimization of beam dynamics in injection systems is considered, which at the same time allows the choice of parameters of the accelerating-focusing system. This permits designing the injection system during optimization process, taking into account the required output characteristics of the beam. The given program is based on Win 32 API dialog boxes and is developed in standard C++, using parallel programming tools based on the MPI-1.

TUPPB054

High Current Ion Sources for the FAIR Accelerator Facility

ion, ion-source, plasma, extraction

436

R. Hollinger, A. Adonin, W.A. Barth, J. Pfister
GSI, Darmstadt, Germany
N. Chauvin
CEA/DSM/IRFU, France

Vacuum Arc Ion Sources and filament driven Multi Cusp Ion Sources are used for the production of high current ion beams of a variety of metallic and gaseous ions at the GSI accelerator facility. For the future project FAIR (Facility of Antiproton and Ion Research) it is foreseen to provide in addition a high current proton beam and an exclusive uranium beam from two new ion source injectors. The contribution gives an overview of the performance of the existing high current injector and presents the challenges for the future injectors for proton and uranium production.

WEPPC017

Pulse Generator for the Beam Injection System of NICA Collider

kicker, power-supply, collider, pulsed-power

481

A.A. Fateev, E.V. Gorbachev, N.I. Lebedev
JINR, Dubna, Moscow Region, Russia

The new scheme of injection kicker elements distribution is described. Parameters of the circuit main elements are estimated. The system allows to produce flat top of the injection pulse with high evenness. The suggested design allows to built reliable and cost effective injection system satisfying the project parameters.

WEPPC042

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

electron, 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.

WEPPD008

Energy Ramping at Siberia-2

betatron, quadrupole, power-supply, resonance

581

A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov
NRC, Moscow, Russia

Siberia-2 storage ring has great difference between injection energy 0.45 GeV and working energy 2.5 GeV. Beam lifetime at injection energy is equal to approximately 1 hour. In order to minimize beam losses of the stored beam it is necessary to accelerate energy ramping process. It is not very simple because power supplies of bending magnets, quadrupole lenses and sextupoles have different response time and behavior after changes in regulated current level. Magnetic elements are manufactured from non-laminated iron. It leads to slower field/gradient increasing at high current values. Complicated algorithm with 9 intermediate regimes (collections of power supplies' settings) was developed to produce fast and efficient energy ramping. First, correction of closed orbit, betatron tunes and chromaticity is accomplished in each regime in static conditions. Special file is used to provide acceleration or deceleration of power supplies in dynamic conditions. This scheme allows to compensate betatron tune shifts during energy ramping. Power supplies are not stopped on intermediate regimes; speed of current changing is continuous function of time. This algorithm allowed decreasing ramping time down to 2 minutes 40 seconds. Beam losses are not exceeding 2 – 3%; betatron tune shifts as a rule are lower than 0.01. The algorithm can easily be modified to stop in any intermediate regime.

WEPPD010

Study of Two Cavities Accelerating Module at SR Source Siberia-2

cavity, impedance, scattering, beam-loading

587

V.I. Moiseev, V. Korchuganov, A.S. Smygacheva, A. Vernov
NRC, Moscow, Russia

SR source Siberia-2 RF system includes an accelerating module consisting of two 181 MHz cavities powered by one amplifier. Some problem occured now is the accelerating voltage instubility under high beam currents conditions. The phase shift between the voltages at cavities causes the asymmetry in beam loading and detuning of cavities. To study the performances of accelerating module, the analytical description has been developed. The whole system can be characterized by seven parameters. These base parameters give the relations of voltages and currents in system. Measurements determine the real values of the base parameters. Set of non linear equations recived can be reduced to the voltages and currents in system as the functions of beam current and energy. The results can be applied to injection and ramping in Siberia-2.

WEPPD030

New Beam Position Monitor Electronics For VEPP-5 Preinjector

positron, electron, linac, background

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.

WEPPD041

Acceleration of Low Charge Krypton Ions in the CYTRACK Cyclotron

ion, cyclotron, acceleration, extraction

632

G.A. Karamysheva, Yu.N. Denisov, O. Karamyshev
JINR, Dubna, Moscow Region, Russia

The basic results of numeric simulations of Krypton ion motion with decreased charge in cyclotron CYTRACK are presented. Cyclotron CYTRACK is the first world industrial cyclotron dedicated to produce the track membranes. Computer modeling confirms the possibility of ion acceleration in the formed magnetic field with increase of the magnetic field level by 1.6% on the 6 harmonic of the accelerating system. Beam energy will be sufficient for exposure of the film with thickness 10 um.

WEPPD045

Optimization of the Detector Geometry and Data Processing Algorithms for FAIR CR BPMs

simulation, antiproton, monitoring, impedance

644

A.Y. Orlov, S.V. Barabin, T. Kulevoy, D.A. Liakin
ITEP, Moscow, Russia

A beam diagnostic is an important part of all FAIR accelerators and storage rings. A small flux of antiprotons in the collector ring CR (10⁸ particles in a store ring) as well as dominated at first turns p-meson component of a beam require careful design for all elements of the beam position monitoring system. To increase a BPM resolution and sensitivity we propose a compact multi-electrode design of the position detector, matched low-noise electronics in connection with dedicated enhanced digital data processing algorithms. Here we present a comprehensive set of aspects of a preliminary design of the BPM system for FAIR CR.