Stabilization of the spectral intensity fluctuations with the higher order mode frequency tuners

Author

Wang, Ch. ; Chang, L.H. ; Chang, S.S. ; Chang, Y.I. ; Kuo, C.C. ; Lai, C.Y. ; Lau, W.K. ; Lin, M.C. ; Lin, S.J. ; Luo, G.H. ; Yang, T.T.

Author_Institution

Synchrotron Radiat. Res. Center, Hsinchu, Taiwan

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1638

Abstract

A strong excitation of the longitudinal coupled-bunch instabilities, which is suspected to be driven by the TM₀₁₁-like mode of the DORIS-I cavities, was observed at the higher electron beam current in the storage ring of SRRC. Such instability leads to heavy fluctuations of the photon beam intensity in the horizontal plane and therefore restricted the maximal useful beam current for the user experiments. This restriction has been released by replacing the damping antennae with the additional tuners. Here, we report our experiences after one-year routine operations of the main RF cavities with the second tuners at SRRC

Keywords

X-ray production; accelerator RF systems; accelerator cavities; electron accelerators; electron beams; fluctuations; particle beam stability; storage rings; 1 y; DORIS-I cavities; RF cavities; SRRC; TM₀₁₁-like mode; electron beam current; higher order mode frequency tuners; longitudinal coupled-bunch instabilities; photon beam intensity; spectral intensity fluctuations stabilization; storage ring; Cooling; Damping; Fluctuations; Q factor; Radio frequency; Resonance; Storage rings; Synchrotron radiation; Temperature; Tuners;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.750785

Filename

750785