Title :
Coupled-bunch instabilities in the APS ring
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
A study of coupled bunch instabilities for the APS storage ring is presented. The instabilities are driven by the higher-order modes of the fifteen 352-MHz single-cell RF cavities. These modes are modeled using the 2-D cavity program URMEL. The program ZAP is then used to estimate the growth time of the instabilities for an equally spaced bunch pattern. The cavity modes most responsible for the instabilities is singled out for damping.<>
Keywords :
electron accelerators; particle beam diagnostics; storage rings; 352 MHz; APS ring; Advanced Photon Source; URMEL; ZAP; cavity modes; coupled bunch instabilities; growth time; higher-order modes; single-cell RF cavities; storage ring; Content addressable storage; Cutoff frequency; Damping; Frequency estimation; Frequency measurement; Impedance; Laboratories; Radio frequency; Resonant frequency; Stability;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164754
