Instability threshold currents vs. energy in CESR

Author

Billing, M. ; Sikora, J.

Author_Institution

LEPP, Cornell Univ., Ithaca, NY, USA

Volume

5

fYear

2003

fDate

12-16 May 2003

Firstpage

3059

Abstract

CESR has been observed to have two coupled bunch instabilities, one horizontal and the other longitudinal, which can limit the total beam current when operating with trains of bunches. Feedback has been employed for some time to counter these instabilities. This paper reports on the threshold current for the onset of the longitudinal instability when feedback is turned off vs. beam energy over a range from 1.9 GeV to 5.2 GeV and compares the change in threshold current with that expected from the change in radiation damping. Operating performance with feedback in use will also be reported for both longitudinal and horizontal instabilities.

Keywords

colliding beam accelerators; electron accelerators; particle beam bunching; particle beam dynamics; particle beam stability; storage rings; 1.9 to 5.2 GeV; CESR; beam energy; coupled bunch instabilities; electron-positron storage ring collider; feedback; horizontal instabilities; instability threshold currents; longitudinal instabilities; radiation damping; total beam current; Colliding beam devices; Damping; Feedback; Impedance; Optical coupling; Radio frequency; Storage rings; Superconducting magnets; Threshold current; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289813

Filename

1289813