RUPAC2012 - List of Authors (Petrenko, A.V.)

Paper

Title

Page

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

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.

WEPPD035

Distributed Beam Loss Monitor Based on Cherenkov Radiation in Optical Fiber

Y. Maltseva, F.A. Emanov, A.V. Petrenko, V.G. Prisekin
BINP SB RAS, Novosibirsk, Russia

A distributed beam loss monitor based on Cherenkov effect for both electron and positron accelerators was developed. The main advantage of a distributed monitor compared to conventional ones is that a long optical fiber section can be used instead of a large number of conventional local beam loss monitors. This type of beam loss monitor operation is based on detection of Cherenkov radiation generated in optical fiber by secondary electrons and positrons from electromagnetic shower. In our experiments Cherenkov light was detected by photomultiplier tube (PMT). The signal arrival time shows the location of losses. Monitor spatial resolution is limited by signal lengthening due to intermode dispersion in optical fiber. The distributed beam loss monitor has just been started to use at VEPP-5 linac lattice. In the experiments with 20 m long optical fiber we achieved spatial resolution of 2 m. In order to improve spatial resolution additional collimator is needed to select photons with different propagating angles. It will allow to achieve spatial resolution of 0.5 m. Moreover, the collimator will make it possible to use longer optical fiber sections. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.

Paper	Title	Page
TUPPB031	Measurement of Beam Parameters in the VEPP-5 Damping Ring Using Betatron Oscillations Decoherence	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.

WEPPD035	Distributed Beam Loss Monitor Based on Cherenkov Radiation in Optical Fiber
	Y. Maltseva, F.A. Emanov, A.V. Petrenko, V.G. Prisekin BINP SB RAS, Novosibirsk, Russia
	A distributed beam loss monitor based on Cherenkov effect for both electron and positron accelerators was developed. The main advantage of a distributed monitor compared to conventional ones is that a long optical fiber section can be used instead of a large number of conventional local beam loss monitors. This type of beam loss monitor operation is based on detection of Cherenkov radiation generated in optical fiber by secondary electrons and positrons from electromagnetic shower. In our experiments Cherenkov light was detected by photomultiplier tube (PMT). The signal arrival time shows the location of losses. Monitor spatial resolution is limited by signal lengthening due to intermode dispersion in optical fiber. The distributed beam loss monitor has just been started to use at VEPP-5 linac lattice. In the experiments with 20 m long optical fiber we achieved spatial resolution of 2 m. In order to improve spatial resolution additional collimator is needed to select photons with different propagating angles. It will allow to achieve spatial resolution of 0.5 m. Moreover, the collimator will make it possible to use longer optical fiber sections. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.