RUPAC2012 - List of Keywords (synchrotron)

Paper	Title	Other Keywords	Page
MOXCH02	Accelerators: Engines for Traversing a Large and Often Difficult Landscape	ion, laser, electron, 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]

MOYCH02	e⁺e⁻ Collider VEPP-4M: Status and Prospects	collider, electron, target, luminosity	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]

TUXCH03	Approach to the Low Temperature State Oriented for Crystalline Beam	laser, ion, electron, proton	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]

TUBCH01	Transient Beam Response in Synchrotrons with a Digital Transverse Feedback System	feedback, damping, kicker, resonance	73
	V. Zhabitsky JINR, Dubna, Moscow Region, Russia
	The transient beam response on an externally applied impulse force in synchrotrons with a digital transverse feedback system is studied. Experimental data from the LHC on damping of coherent transverse oscillations excited by the discrete-time unit impulse are analysed. Good agreement on the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning, based on measurements of bunch response on harmonic excitation impulse, is discussed.
	Slides TUBCH01 [5.652 MB]

THXCH02	The Development of Synchrotron Radiation Source of NRC "Kurchatov Institute"	electron, wiggler, controls, storage-ring	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]

MOPPA016	Dynamics of 197Au⁷⁸⁺ Ions Generated in Recombination with Cooling Electrons in the NICA Collider	ion, collider, vacuum, electron	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.

TUPPB001	Study of Dynamical Aperture of NICA Collider with Account of Magnetic Field Errors and Coulomb Effects	collider, resonance, simulation, ion	304
	P.R. Zenkevich, A. Bolshakov ITEP, Moscow, Russia
	By use of MADX code beam dynamics in NICA collider has been studied. NICA collider has comparatively small kinetic ion energies (1.5-5 GeV/u) that results in one beam Coulomb effects. These effects are simulated by set of "BEAM-BEAM" elements with appropriate chosen strength and location. Besides it was taken into account beam-beam interaction and influence of systematic and random errors of the magnetic field. The simulation results are given and discussed.

TUPPB013	Dependence on Betatron Oscillations of the Angular Velocity	radiation, electron, 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	electron, 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).

TUPPB016	Investigation of Phase Trajectories of Particles Motion in a Synchrotron Near the Nonlinear Resonance of Third Order	resonance, extraction, storage-ring, octupole	347
	Y.A. Bashmakov LPI, Moscow, Russia
	The nonlinear resonance of third order plays an important role in the particle dynamics in circular accelerators, colliders and storage rings and is widely used for slow extraction of particles from synchrotrons. Consideration is carried out in the canonical variables X, Y which at a given accelerator azimuth are simply related to the angle and the deviation of the circulating particles relative to the equilibrium orbit. The problem is reduced to the construction of the phase trajectories, which are the curves of the third or fourth order and determine the type of the motion near the resonance under consideration. The construction of the phase trajectories is performed by the Klein's perturbation method. The influence on the particles dynamics of oсtupole component of the magnetic fields is investigated.

TUPPB031	Measurement of Beam Parameters in the VEPP-5 Damping Ring Using Betatron Oscillations Decoherence	damping, betatron, electron, positron	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.

TUPPB035	The Kicker Parameters Estimation for Longitudinal Instability Damping of the Beam at SR Storage Ring "Siberia-2"	HOM, kicker, cavity, storage-ring	394
	A.S. Smygacheva, V. Korchuganov NRC, Moscow, Russia A. Vernov RRC, Moscow, Russia
	RF system of the Kurchatov Institute Synchrotron Radiation storage ring "Siberia-2" consists of three cavities. Each of them has two HOMs tuners. Due to the shunt impedance and quality factor of HOMs are high, the beam-cavity interaction leads to the instability and the beam loss as the result. We have to develop a longitudinal feedback system based on the kicker, to cure the longitudinal instabilities. In the article the investigations of the field spectra of the cavities at the beam energy 450 MeV and 2,5 GeV, excited by the beam and the generator, are presented. According to the measurements of the field spectra of the cavities, the most strong HOMs were found. Main parameters of the kicker such as a frequency, a shunt impedance, a quality factor and a power, were calculated.

WEPPC021	Nonlinear Shunting as a Method of Magnetic Field Correction in Quadrupole Lenses	quadrupole, sextupole, insertion, multipole	492
	A.S. Tsyganov, E.S. Kazantseva, T.V. Rybitskaya, B.A. Skarbo, A.A. Starostenko BINP SB RAS, Novosibirsk, Russia
	Magnetic field quality requirements of lenses in modern particle accelerators are high. For example, harmonic fields of quadrupole lenses (manufactured in BINP SB RAS) of main ring of synchrotron source NSLS-II, must have no more than 1-2·10^-4 from the field at 75% of the aperture of the lens. Various methods of mechanical improvements are used to adjust the fields in the production process of magnetic lenses. Mechanical improvements result in increased time and cost of production. The report proposes a method for precise nondestructive correction of some magnetic field harmonics of the quadrupole lenses. Correction is performed using an additional element - non-linear current shunt of some coils. The report contains experimental data showing the possibilities of this method.

WEPPC022	Stand for Precision Measurements of Magnetic Lenses Field Quality	quadrupole, controls, octupole, power-supply	495
	A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly BINP SB RAS, Novosibirsk, Russia
	Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPC027	Correcting Magnet Power Supplies for the NSLS-II Booster	booster, dipole, sextupole, controls	500
	K.R. Yaminov, O.V. Belikov, P.B. Cheblakov, A.I. Erokhin, S.E. Karnaev, V.V. Kolmogorov, A.S. Medvedko, S.R. Singatulin BINP SB RAS, Novosibirsk, Russia
	Budkers Institute of Nuclear physics builds booster for syncrotron light source NSLS-II. Booster should accelerate electrons from energy 200 MeV to energy 3 GeV, acceleration phase duration is 250 ms, repetition rate – up to 2 Hz. Booster magnet system includes 16 sextuples and 36 dipole correcting magnets powered separately. Forth-quadratant current sources for sextuples and correcting magnets have maximum output current ±6 А, maximum output voltage ±100 V, maximim output current ripples and long-term stability are better than 0,1% relative to 6 A. In ramping mode with current slew rate up to 200 A/s time lag between setpoint and output current is not more than 1msec and can be compensated by software. Results of power supplies system tests and commissioning will be presented in paper.

WEPPC031	3-Channel Current Source with Channel Output Current up to 180 A and Output Voltage up to 180 V	controls, quadrupole, power-supply, feedback	509
	D.V. Senkov, A.I. Erokhin, I.A. Gusev, V.V. Kolmogorov, A.S. Medvedko, S.I. Potapov, D.N. Pureskin BINP SB RAS, Novosibirsk, Russia
	The presented report contains the description of 3-channel current source with channel output current up to 180 A and output voltage. Each channel can be operated and controled independently. The source consists of 2 part. First part is charging source with capasitance bank at output. And the second part is 3 current sources powered by a capacitance bank. The charging source is converter with IGBT switches, working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, with high power rectivier at output. The source output voltage is up to 180 V, peak power is 40 kW and average power is 20 kW. Capacitance bank has 120 kVA storage energy. Second part contains 3 independent current sources with up to 180 A output current each. Each current source consist of H-bridge 2-quadrant convertor with MOSFET switches working on 50 kHz frequency and tho output LC filter. The controllers of the sources is developed with DSP and PLM, which allows optimizing operations of the sources. The controllers are connected by internal control network for more flexibility and efficiency. The description of the source and the test results are presented.

WEPPC035	System of Vacuum Monitoring of Synchrotron Radiation Source of National Research Center Kurchatov Institute	vacuum, controls, high-voltage, radiation	518
	N.I. Moseiko, V. Korchuganov, D.G. Odintsov NRC, Moscow, Russia Y.V. Krylov, L.A. Moseiko, A.V. Shirokov RRC, Moscow, Russia B.I. Semenov RRC KI, Moscow, Russia
	The source of synchrotron radiation of National Research Center Kurchatov Institute (KCSR) consists of the main ring on energy of electrons of 2.5 GeV, the booster ring on the maximum energy of 450 MeV and 80 MeV linac. The project of upgrade of KCSR vacuum system, including transition to new power supplies for sputter ion pumps is developed and is implemented. The vacuum system provides vacuum of 0.1 mkPa. The new vacuum system is developed on the basis of the modern high-voltage power supply of the VIP-27 type controlled by the interface units of the BUP-27 type, is placed in standard crate 3U Euromechanics. VIP-27 is controlled the four pumps of PVIG 250/600 type. The vacuum system is controlled from the Pentium computer on the CAN bus. Now the upgraded system serves about 100 vacuum pumps. Power supply unit provides voltage up to 7 kV. The vacuum monitoring is provided by measurements of the current of the power supply unit in the range of 0.0001-10 mA. The status display and the data archive based on MS SQL Server.

WEPPD009	Measurement of Speed of Light Emitted by Ultrarelativistic Source	electron, radiation, 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.

WEPPD029	Fast Tune Measurement System	betatron, booster, kicker, pick-up	611
	E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, A.S. Styuf BINP SB RAS, Novosibirsk, Russia
	Tune measurement system developed in Budker Institute of Nuclear Physics provides fast and accurate measurements of fractional part of betatron tunes in electron-positron storage rings and accelerators. The tune measurements rate can achieve 1 kHz. It is especially important for electron-positron accelerators to have tunes measurement data for each phase of accelerating cycle. The developed system is planed to be installed at the NSLS-II Booster Synchrotron. The system can perform up to 330 measurements during 300 ms time interval of Booster energy ramping. The kicking technique is used as measurement method. The kicks are carried out by a radio frequency (RF) pulses. Each RF pulse contains two frequencies and thus can simultaneously excite the horizontal and vertical betatron oscillations. All signal processing including FFT is performed inside FPGA. The tune measurement accuracy is better than 0.0005. The developed system was put into operation at the February 2011 in VEPP-3 electron-positron storage ring at BINP.

WEPPD032	Multimode Digital Integrators For Precise Magnetic Measurements	induction, vacuum, booster, controls	617
	A.V. Pavlenko, A.M. Batrakov, D. Shichkov BINP SB RAS, Novosibirsk, Russia P.V. Vagin DESY, Hamburg, Germany
	The induction method of magnetic measurement is the most important, widely used and oldest measurement method for particle accelerator magnets. Nevertheless, both the new demands of the accelerator techniques and possibilities of modern electronics stimulate the creation of more accurate and fast instrumentation, based on the induction method. This report describes the multimode integrators intended for magnetic measurements with the relative accuracy better than 10^-4 and even better than 10^-5 in special cases. Integrators provide high accuracy level both for the constant magnetic field measurements using movable coils and for the pulse measurements also. Modern digital techniques are used to get the partial integral of signal in the strongly determined time interval. The paper considers theoretical issues of the digital integration technique and related error sources. The structure of digital integrator is presented, and key features are listed. In conclusion a brief description of two magnetic measurement systems is given. The first system is used to measure the magnetic field transverse distribution in pulse elements, and the second one – to measure the harmonics in magnetic lenses with constant field.

WEPPD043	Concept of the Software for ITEP-TWAC Control System	controls, diagnostics, proton	638
	P.N. Alekseev, F.A. Sizov ITEP, Moscow, Russia
	The work is in progress on the development of new control system for ITEP accelerators complex. All the software for the system should be developed from the very beginning. Core element of new software is PostgreSQL object-relational database management system. All interaction between the programms on device side and on operator side are made utilizing the database functionality. The database is also provides storage space for all configuration data, operational modes, logs and so on.Concept of the software for ITEP-TWAC control system.

WEPPD052	Modernization of the Automated Control System in the Kurchatov Synchrotron Radiation Source	controls, vacuum, synchrotron-radiation, radiation	659
	E.V. Kaportsev, V. Dombrovsky, Y.V. Efimov, V. Korchuganov, Y.V. Krylov, K. Moseev, N.I. Moseiko, A.G. Valentinov, Y.L. Yupinov NRC, Moscow, Russia
	The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 300 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 200 mA, and at last the energy ramping up to 2.5 GeV. The current automated control system (ACS) of the accelerating-storage complex (ASC) "SIBERIA" was established more than 20 years ago on the basis of the control equipment in the CAMAC standard. It is physically and morally outdated and does not meet modern requirements for speed, accuracy and speed of data transmission. This paper presents some options for replacing the old control system ESC to more modern components, using high-speed processor modules VME, and high-speed industrial network CAN.

WEPPD053	New Electron Beam Reference Orbit Measurement System at Dedicated Synchrotron Radiation Light Source SIBERIA-2	electron, brilliance, controls, radiation	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.

Paper

Title

Other Keywords

Page

MOXCH02

Accelerators: Engines for Traversing a Large and Often Difficult Landscape

ion, laser, electron, 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]

MOYCH02

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

collider, electron, target, luminosity

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]

TUXCH03

Approach to the Low Temperature State Oriented for Crystalline Beam

laser, ion, electron, proton

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]

TUBCH01

Transient Beam Response in Synchrotrons with a Digital Transverse Feedback System

feedback, damping, kicker, resonance

73

V. Zhabitsky
JINR, Dubna, Moscow Region, Russia

The transient beam response on an externally applied impulse force in synchrotrons with a digital transverse feedback system is studied. Experimental data from the LHC on damping of coherent transverse oscillations excited by the discrete-time unit impulse are analysed. Good agreement on the measured and theoretically predicted decrements has been obtained. A method of feedback fine tuning, based on measurements of bunch response on harmonic excitation impulse, is discussed.

Slides TUBCH01 [5.652 MB]

THXCH02

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

electron, wiggler, controls, storage-ring

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]

MOPPA016

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

ion, collider, vacuum, electron

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.

TUPPB001

Study of Dynamical Aperture of NICA Collider with Account of Magnetic Field Errors and Coulomb Effects

collider, resonance, simulation, ion

304

P.R. Zenkevich, A. Bolshakov
ITEP, Moscow, Russia

By use of MADX code beam dynamics in NICA collider has been studied. NICA collider has comparatively small kinetic ion energies (1.5-5 GeV/u) that results in one beam Coulomb effects. These effects are simulated by set of "BEAM-BEAM" elements with appropriate chosen strength and location. Besides it was taken into account beam-beam interaction and influence of systematic and random errors of the magnetic field. The simulation results are given and discussed.

TUPPB013

Dependence on Betatron Oscillations of the Angular Velocity

radiation, electron, 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

electron, 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).

TUPPB016

Investigation of Phase Trajectories of Particles Motion in a Synchrotron Near the Nonlinear Resonance of Third Order

resonance, extraction, storage-ring, octupole

347

Y.A. Bashmakov
LPI, Moscow, Russia

The nonlinear resonance of third order plays an important role in the particle dynamics in circular accelerators, colliders and storage rings and is widely used for slow extraction of particles from synchrotrons. Consideration is carried out in the canonical variables X, Y which at a given accelerator azimuth are simply related to the angle and the deviation of the circulating particles relative to the equilibrium orbit. The problem is reduced to the construction of the phase trajectories, which are the curves of the third or fourth order and determine the type of the motion near the resonance under consideration. The construction of the phase trajectories is performed by the Klein's perturbation method. The influence on the particles dynamics of oсtupole component of the magnetic fields is investigated.

TUPPB031

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

damping, betatron, electron, positron

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.

TUPPB035

The Kicker Parameters Estimation for Longitudinal Instability Damping of the Beam at SR Storage Ring "Siberia-2"

HOM, kicker, cavity, storage-ring

394

A.S. Smygacheva, V. Korchuganov
NRC, Moscow, Russia
A. Vernov
RRC, Moscow, Russia

RF system of the Kurchatov Institute Synchrotron Radiation storage ring "Siberia-2" consists of three cavities. Each of them has two HOMs tuners. Due to the shunt impedance and quality factor of HOMs are high, the beam-cavity interaction leads to the instability and the beam loss as the result. We have to develop a longitudinal feedback system based on the kicker, to cure the longitudinal instabilities. In the article the investigations of the field spectra of the cavities at the beam energy 450 MeV and 2,5 GeV, excited by the beam and the generator, are presented. According to the measurements of the field spectra of the cavities, the most strong HOMs were found. Main parameters of the kicker such as a frequency, a shunt impedance, a quality factor and a power, were calculated.

WEPPC021

Nonlinear Shunting as a Method of Magnetic Field Correction in Quadrupole Lenses

quadrupole, sextupole, insertion, multipole

492

A.S. Tsyganov, E.S. Kazantseva, T.V. Rybitskaya, B.A. Skarbo, A.A. Starostenko
BINP SB RAS, Novosibirsk, Russia

Magnetic field quality requirements of lenses in modern particle accelerators are high. For example, harmonic fields of quadrupole lenses (manufactured in BINP SB RAS) of main ring of synchrotron source NSLS-II, must have no more than 1-2·10^-4 from the field at 75% of the aperture of the lens. Various methods of mechanical improvements are used to adjust the fields in the production process of magnetic lenses. Mechanical improvements result in increased time and cost of production. The report proposes a method for precise nondestructive correction of some magnetic field harmonics of the quadrupole lenses. Correction is performed using an additional element - non-linear current shunt of some coils. The report contains experimental data showing the possibilities of this method.

WEPPC022

Stand for Precision Measurements of Magnetic Lenses Field Quality

quadrupole, controls, octupole, power-supply

495

A.S. Tsyganov, A.M. Batrakov, E.S. Kazantseva, A.V. Pavlenko, T.V. Rybitskaya, D. Shichkov, B.A. Skarbo, A.A. Starostenko, P. Vobly
BINP SB RAS, Novosibirsk, Russia

Strict requirements are imposed on the field quality of magnetic elements in today’s synchrotron radiation sources. For example, magnetic field harmonics of quadrupole lenses (currently manufactured in BINP) of main ring NSLS-II, should have no more than one or two ten-thousandths parts of main harmonic at the 75% of lens aperture. The stand is designed for precise measurement of the quadrupole lenses. The well-known technique with a rotating coil was used. The design and location of coils used in the measuring shaft and the method of commutation allow to compensate for both quadrupole and dipole components of the magnetic field. This, in turn, minimizes shaft beats effect and power supply noises effect on the accuracy of the results. During measurements, the shaft is rotated without stopping, and the data received from the gauge angle and digital integrators are processed "on the fly" strictly synchronous. The measurement procedure is performed in one and a half turn of the shaft and takes six seconds. The report describes mechanical design of the stand, principle of work, parameters of the equipment, and software. Results of measurements of the quadrupole lenses synchrotron source NSLS-II are given in conclusion. The results demonstrate possibilities of the stand.

WEPPC027

Correcting Magnet Power Supplies for the NSLS-II Booster

booster, dipole, sextupole, controls

500

K.R. Yaminov, O.V. Belikov, P.B. Cheblakov, A.I. Erokhin, S.E. Karnaev, V.V. Kolmogorov, A.S. Medvedko, S.R. Singatulin
BINP SB RAS, Novosibirsk, Russia

Budkers Institute of Nuclear physics builds booster for syncrotron light source NSLS-II. Booster should accelerate electrons from energy 200 MeV to energy 3 GeV, acceleration phase duration is 250 ms, repetition rate – up to 2 Hz. Booster magnet system includes 16 sextuples and 36 dipole correcting magnets powered separately. Forth-quadratant current sources for sextuples and correcting magnets have maximum output current ±6 А, maximum output voltage ±100 V, maximim output current ripples and long-term stability are better than 0,1% relative to 6 A. In ramping mode with current slew rate up to 200 A/s time lag between setpoint and output current is not more than 1msec and can be compensated by software. Results of power supplies system tests and commissioning will be presented in paper.

WEPPC031

3-Channel Current Source with Channel Output Current up to 180 A and Output Voltage up to 180 V

controls, quadrupole, power-supply, feedback

509

D.V. Senkov, A.I. Erokhin, I.A. Gusev, V.V. Kolmogorov, A.S. Medvedko, S.I. Potapov, D.N. Pureskin
BINP SB RAS, Novosibirsk, Russia

The presented report contains the description of 3-channel current source with channel output current up to 180 A and output voltage. Each channel can be operated and controled independently. The source consists of 2 part. First part is charging source with capasitance bank at output. And the second part is 3 current sources powered by a capacitance bank. The charging source is converter with IGBT switches, working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, with high power rectivier at output. The source output voltage is up to 180 V, peak power is 40 kW and average power is 20 kW. Capacitance bank has 120 kVA storage energy. Second part contains 3 independent current sources with up to 180 A output current each. Each current source consist of H-bridge 2-quadrant convertor with MOSFET switches working on 50 kHz frequency and tho output LC filter. The controllers of the sources is developed with DSP and PLM, which allows optimizing operations of the sources. The controllers are connected by internal control network for more flexibility and efficiency. The description of the source and the test results are presented.

WEPPC035

System of Vacuum Monitoring of Synchrotron Radiation Source of National Research Center Kurchatov Institute

vacuum, controls, high-voltage, radiation

518

N.I. Moseiko, V. Korchuganov, D.G. Odintsov
NRC, Moscow, Russia
Y.V. Krylov, L.A. Moseiko, A.V. Shirokov
RRC, Moscow, Russia
B.I. Semenov
RRC KI, Moscow, Russia

The source of synchrotron radiation of National Research Center Kurchatov Institute (KCSR) consists of the main ring on energy of electrons of 2.5 GeV, the booster ring on the maximum energy of 450 MeV and 80 MeV linac. The project of upgrade of KCSR vacuum system, including transition to new power supplies for sputter ion pumps is developed and is implemented. The vacuum system provides vacuum of 0.1 mkPa. The new vacuum system is developed on the basis of the modern high-voltage power supply of the VIP-27 type controlled by the interface units of the BUP-27 type, is placed in standard crate 3U Euromechanics. VIP-27 is controlled the four pumps of PVIG 250/600 type. The vacuum system is controlled from the Pentium computer on the CAN bus. Now the upgraded system serves about 100 vacuum pumps. Power supply unit provides voltage up to 7 kV. The vacuum monitoring is provided by measurements of the current of the power supply unit in the range of 0.0001-10 mA. The status display and the data archive based on MS SQL Server.

WEPPD009

Measurement of Speed of Light Emitted by Ultrarelativistic Source

electron, radiation, 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.

WEPPD029

Fast Tune Measurement System

betatron, booster, kicker, pick-up

611

E.A. Bekhtenev, V.P. Cherepanov, G.V. Karpov, A.S. Styuf
BINP SB RAS, Novosibirsk, Russia

Tune measurement system developed in Budker Institute of Nuclear Physics provides fast and accurate measurements of fractional part of betatron tunes in electron-positron storage rings and accelerators. The tune measurements rate can achieve 1 kHz. It is especially important for electron-positron accelerators to have tunes measurement data for each phase of accelerating cycle. The developed system is planed to be installed at the NSLS-II Booster Synchrotron. The system can perform up to 330 measurements during 300 ms time interval of Booster energy ramping. The kicking technique is used as measurement method. The kicks are carried out by a radio frequency (RF) pulses. Each RF pulse contains two frequencies and thus can simultaneously excite the horizontal and vertical betatron oscillations. All signal processing including FFT is performed inside FPGA. The tune measurement accuracy is better than 0.0005. The developed system was put into operation at the February 2011 in VEPP-3 electron-positron storage ring at BINP.

WEPPD032

Multimode Digital Integrators For Precise Magnetic Measurements

induction, vacuum, booster, controls

617

A.V. Pavlenko, A.M. Batrakov, D. Shichkov
BINP SB RAS, Novosibirsk, Russia
P.V. Vagin
DESY, Hamburg, Germany

The induction method of magnetic measurement is the most important, widely used and oldest measurement method for particle accelerator magnets. Nevertheless, both the new demands of the accelerator techniques and possibilities of modern electronics stimulate the creation of more accurate and fast instrumentation, based on the induction method. This report describes the multimode integrators intended for magnetic measurements with the relative accuracy better than 10^-4 and even better than 10^-5 in special cases. Integrators provide high accuracy level both for the constant magnetic field measurements using movable coils and for the pulse measurements also. Modern digital techniques are used to get the partial integral of signal in the strongly determined time interval. The paper considers theoretical issues of the digital integration technique and related error sources. The structure of digital integrator is presented, and key features are listed. In conclusion a brief description of two magnetic measurement systems is given. The first system is used to measure the magnetic field transverse distribution in pulse elements, and the second one – to measure the harmonics in magnetic lenses with constant field.

WEPPD043

Concept of the Software for ITEP-TWAC Control System

controls, diagnostics, proton

638

P.N. Alekseev, F.A. Sizov
ITEP, Moscow, Russia

The work is in progress on the development of new control system for ITEP accelerators complex. All the software for the system should be developed from the very beginning. Core element of new software is PostgreSQL object-relational database management system. All interaction between the programms on device side and on operator side are made utilizing the database functionality. The database is also provides storage space for all configuration data, operational modes, logs and so on.Concept of the software for ITEP-TWAC control system.

WEPPD052

Modernization of the Automated Control System in the Kurchatov Synchrotron Radiation Source

controls, vacuum, synchrotron-radiation, radiation

659

E.V. Kaportsev, V. Dombrovsky, Y.V. Efimov, V. Korchuganov, Y.V. Krylov, K. Moseev, N.I. Moseiko, A.G. Valentinov, Y.L. Yupinov
NRC, Moscow, Russia

The running cycle of Kurchatov Synchrotron Radiation Source (KSRS) includes the injection of electrons with energy 80 MeV from the linear accelerator in the booster storage ring Siberia-1, the accumulation of a electron current up to 300 mA and, then, electron energy ramping up to 450 MeV with the subsequent extraction of electrons in the main ring, storage ring Siberia-2, and accumulation there up to 200 mA, and at last the energy ramping up to 2.5 GeV. The current automated control system (ACS) of the accelerating-storage complex (ASC) "SIBERIA" was established more than 20 years ago on the basis of the control equipment in the CAMAC standard. It is physically and morally outdated and does not meet modern requirements for speed, accuracy and speed of data transmission. This paper presents some options for replacing the old control system ESC to more modern components, using high-speed processor modules VME, and high-speed industrial network CAN.

WEPPD053

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

electron, brilliance, controls, radiation

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.