Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987234
