RUPAC2012 - List of Authors (Valentinov, A.G.)

Paper

Title

Page

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

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]

WEPPD007

Vertical Size of an Electron Beam at Siberia-2

578

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

Brightness of the synchrotron radiation light sources is defined by electron beam sizes at radiation point. Horizontal size depends mainly from designed magnetic structure. Vertical size is defined by two processes: first, betatron coupling between vertical and horizontal motions and second, presence of vertical dispersion function at bending magnets. Vertical dispersion creates non-zero vertical emittance even without coupling. The report is dedicated to methods of vertical beam size decreasing at Siberia-2 storage ring. There are two families of skew-quadrupoles on the ring, one lens of every family in each of 6 cells of the magnetic structure. After analyzing of betatron coupling coefficient equation we stayed only two lenses in each family. As a result family currents for coupling compensation became much lower. In order to decrease vertical dispersion a special algorithm was developed and tested. Vertical dispersion on BPM azimuths was corrected by vertical displacements of sextupoles for chromaticity compensation. Maximal value of the dispersion became four times lower. It leaded to prominent vertical beam size decreasing.

WEPPD008

Energy Ramping at Siberia-2

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.

WEPPD052

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

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

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	Page
THXCH02	The Development of Synchrotron Radiation Source of NRC "Kurchatov Institute"	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]

WEPPD007	Vertical Size of an Electron Beam at Siberia-2	578
	A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov NRC, Moscow, Russia
	Brightness of the synchrotron radiation light sources is defined by electron beam sizes at radiation point. Horizontal size depends mainly from designed magnetic structure. Vertical size is defined by two processes: first, betatron coupling between vertical and horizontal motions and second, presence of vertical dispersion function at bending magnets. Vertical dispersion creates non-zero vertical emittance even without coupling. The report is dedicated to methods of vertical beam size decreasing at Siberia-2 storage ring. There are two families of skew-quadrupoles on the ring, one lens of every family in each of 6 cells of the magnetic structure. After analyzing of betatron coupling coefficient equation we stayed only two lenses in each family. As a result family currents for coupling compensation became much lower. In order to decrease vertical dispersion a special algorithm was developed and tested. Vertical dispersion on BPM azimuths was corrected by vertical displacements of sextupoles for chromaticity compensation. Maximal value of the dispersion became four times lower. It leaded to prominent vertical beam size decreasing.

WEPPD008	Energy Ramping at Siberia-2	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.

WEPPD052	Modernization of the Automated Control System in the Kurchatov Synchrotron Radiation Source	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	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.