RF system for bunch lengthening

Author

Biscardi, R. ; Ramirez, G.

Author_Institution

Brookhaven Nat. Lab., Upton, NY, USA

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1660

Abstract

A harmonic cavity is used in the VUV ring to increase the Touschek lifetime and to help reduce peak current related instabilities. Phase locking servos for such a system normally require comparison of a Fourier component of the beam to a reference or information about the symmetry of the bunch. We have found it simpler to initially set the phase of the drive so that the center of the bunch is positioned at the zero crossing of the harmonic cavity voltage waveform. This phase relationship is then maintained by comparing the amplitude of the harmonic cavity field to the forward power, and adjusting the phase of the drive to keep the two powers equal. A system of this type has been operating in the VUV ring since October, 1993. It consists of a 52.88 MHz accelerating cavity and a 211.54 MHz bunch lengthening cavity providing increased lifetime over all operating currents

Keywords

accelerator RF systems; accelerator cavities; beam handling techniques; electron accelerators; storage rings; 211.54 MHz; 52.88 MHz; RF system; Touschek lifetime; VUV ring; bunch lengthening; bunch lengthening cavity; harmonic cavity; harmonic cavity field; harmonic cavity voltage waveform; peak current related instabilities; phase locking servos; Acceleration; Electrons; Impedance; Laboratories; Length measurement; Power system harmonics; Radio frequency; Servomechanisms; Shape measurement; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505319

Filename

505319