RUPAC2012 - List of Keywords (pick-up)

Paper	Title	Other Keywords	Page
THBCH01	High Precision Power Supply for Accelerator Magnets	power-supply, controls, shielding, cyclotron	158
	A.S. Banerjee DAE/VECC, Calcutta, India
	High precision power supplies are used to power various accelerator magnets to generate stable magnetic field required for various dynamic functions of the charged particles in an Accelerator system. High current stability of the order of 5ppm to 100ppm depending on the various functional applications of the accelerator magnet is the main feature of these power supplies. The paper describes the various technical aspects and considerations depicting ripple reduction techniques, regulating loops, high precision temperature controller, R.F. pick-up attenuation, power dissipation control, handling of the input supply line power disturbances etc., which are important for achieving high stability of the power supply.
	Slides THBCH01 [1.036 MB]

TUPPB004	Development of Stochastic Cooling Technique for NICA Project	kicker, collider, ion, simulation	313
	N. Shurkhno MSU, Moscow, Russia A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia R. Stassen FZJ, Jülich, Germany
	The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.

WEPPD029	Fast Tune Measurement System	betatron, booster, kicker, synchrotron	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.

WEPPD046	Digital Delay-Line Periodic FIR Filter Layout of Transverse Feedback in the U70	feedback, damping, betatron, kicker	647
	O.P. Lebedev, N.A. Ignashin, S.V. Ivanov, S.E. Sytov IHEP, Moscow Region, Russia
	A novel architecture of the wide-band transverse feedback system was successfully beam-tested in the U70 proton synchrotron of IHEP-Protvino. It employs a finite-time impulse response (FIR) non-recursive filter layout based on 3 (or 4, optionally) variable (10%) multi-turn digital delay lines. Apart of using these natural-to-DSP components, the configuration involved has, at least, two operational advantages: (1) A single beam pickup layout plus acceptability of an arbitrary betatron phase advance between pickup and kicker. (2) A straightforward rejection of hampering DC and higher rotation frequency harmonic signals from beam position readouts. The latter occurs due to a periodic notch nature inherent in the amplitude-frequency in-out open-loop feedback transfer function. The paper reports on technical solutions implemented, problem-oriented R&D studies, and beam observations.

Paper

Title

Other Keywords

Page

THBCH01

High Precision Power Supply for Accelerator Magnets

power-supply, controls, shielding, cyclotron

158

A.S. Banerjee
DAE/VECC, Calcutta, India

High precision power supplies are used to power various accelerator magnets to generate stable magnetic field required for various dynamic functions of the charged particles in an Accelerator system. High current stability of the order of 5ppm to 100ppm depending on the various functional applications of the accelerator magnet is the main feature of these power supplies. The paper describes the various technical aspects and considerations depicting ripple reduction techniques, regulating loops, high precision temperature controller, R.F. pick-up attenuation, power dissipation control, handling of the input supply line power disturbances etc., which are important for achieving high stability of the power supply.

Slides THBCH01 [1.036 MB]

TUPPB004

Development of Stochastic Cooling Technique for NICA Project

kicker, collider, ion, simulation

313

N. Shurkhno
MSU, Moscow, Russia
A.G. Kobets, I.N. Meshkov, V.V. Seleznev, A.O. Sidorin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
R. Stassen
FZJ, Jülich, Germany

The experiment on stochastic cooling at Nuclotron, initiated two years ago as a test bench for NICA collider, is progressing. Stochastic cooling system was constructed in 2011. Important results of runs performed at Nuclotron (December 2011 and March 2012) are the following: beam Shottky-noise in the energy range 0.5-4 GeV/u has been measured for deutron and carbon beams with new pick-up structure and methodology for notch-filter and system delay adjustments (open-loop measurements) have been tested. Afterwards the initial scheme was revised and significantly improved and now is being prepared for the experiment. This report presents the results of first stochastic cooling tests at Nuclotron, and further development of stochastic cooling system.

WEPPD029

Fast Tune Measurement System

betatron, booster, kicker, synchrotron

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.

WEPPD046

Digital Delay-Line Periodic FIR Filter Layout of Transverse Feedback in the U70

feedback, damping, betatron, kicker

647

O.P. Lebedev, N.A. Ignashin, S.V. Ivanov, S.E. Sytov
IHEP, Moscow Region, Russia

A novel architecture of the wide-band transverse feedback system was successfully beam-tested in the U70 proton synchrotron of IHEP-Protvino. It employs a finite-time impulse response (FIR) non-recursive filter layout based on 3 (or 4, optionally) variable (10%) multi-turn digital delay lines. Apart of using these natural-to-DSP components, the configuration involved has, at least, two operational advantages: (1) A single beam pickup layout plus acceptability of an arbitrary betatron phase advance between pickup and kicker. (2) A straightforward rejection of hampering DC and higher rotation frequency harmonic signals from beam position readouts. The latter occurs due to a periodic notch nature inherent in the amplitude-frequency in-out open-loop feedback transfer function. The paper reports on technical solutions implemented, problem-oriented R&D studies, and beam observations.