RUPAC2012 - List of Keywords (storage-ring)

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

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

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

TUPPB014	Cooling of Electron Beams	electron, synchrotron, radiation, 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, synchrotron, extraction, 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.

TUPPB026	Comparison of Matrix Formalism and Step-by-step Integration for the Long-term Dynamics Simulation in Electrostatic Fields	simulation, lattice, electromagnetic-fields, controls	370
	A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia
	An approach based on matrix formalism for solving differential equations is described. Effective in sense of performance matrix formalism can be tested with less efficient, but accurate traditional algorithm of numerical simulation based on the Runge-Kutta scheme. In both cases the symplectic version of the algorithms are used. The results coincide to analytical calculations, but some disagreements have been identified. The approach implementation is demonstrated in the problem of long-term spin dynamics in electrostatic fields.

TUPPB035	The Kicker Parameters Estimation for Longitudinal Instability Damping of the Beam at SR Storage Ring "Siberia-2"	HOM, kicker, cavity, synchrotron	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.

Paper

Title

Other Keywords

Page

MOZCH01

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

ion, electron, injection, 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]

TUZCH01

Current Plans for Beam Cooling at FAIR

antiproton, ion, target, electron

63

M. Steck
GSI, Darmstadt, Germany

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

Slides TUZCH01 [4.493 MB]

THXCH02

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

electron, wiggler, controls, synchrotron

126

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

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

Slides THXCH02 [5.459 MB]

TUPPB014

Cooling of Electron Beams

electron, synchrotron, radiation, 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, synchrotron, extraction, 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.

TUPPB026

Comparison of Matrix Formalism and Step-by-step Integration for the Long-term Dynamics Simulation in Electrostatic Fields

simulation, lattice, electromagnetic-fields, controls

370

A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia

An approach based on matrix formalism for solving differential equations is described. Effective in sense of performance matrix formalism can be tested with less efficient, but accurate traditional algorithm of numerical simulation based on the Runge-Kutta scheme. In both cases the symplectic version of the algorithms are used. The results coincide to analytical calculations, but some disagreements have been identified. The approach implementation is demonstrated in the problem of long-term spin dynamics in electrostatic fields.

TUPPB035

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

HOM, kicker, cavity, synchrotron

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.