Study on a longitudinal quadrupole-mode bunch oscillation in the KEK photon factory storage ring

Author

Sakanaka, S. ; Obina, T. ; Mitsuhashi, T.

Author_Institution

Inst. of Mater. Struct. Sci., High Energy Accelerator Res. Organ., Ibaraki, Japan

Volume

3

fYear

2001

fDate

2001

Firstpage

1936

Abstract

In order to understand the beam behavior under rf phase modulation, which has been used to improve the beam lifetime, we studied the response of induced bunch oscillations. By applying a phase modulation at frequencies around two-times the synchrotron frequency, both the quadrupole-mode and the dipole-mode longitudinal oscillations were excited. We found that the bunch oscillated resonantly at two separate frequencies, which could be assigned to the coherent quadrupole-mode frequency and twice the coherent dipole-mode frequency, respectively

Keywords

X-ray production; accelerator RF systems; accelerator magnets; electromagnets; electron accelerators; particle beam bunching; particle beam stability; storage rings; KEK photon factory storage ring; beam behavior; beam lifetime; dipole-mode longitudinal oscillations; induced bunch oscillation response; longitudinal beam instabilities; longitudinal quadrupole-mode bunch oscillation; phase modulation; quadrupole-mode longitudinal oscillations; radiofrequency phase modulation; synchrotron frequency; Electrons; Frequency modulation; Optical modulation; Particle beams; Phase modulation; Production facilities; Resonance; Storage rings; Synchrotrons; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001

Conference_Location

Chicago, IL

Print_ISBN

0-7803-7191-7

Type

conf

DOI

10.1109/PAC.2001.987234

Filename

987234