PEP II: RF and feedback R D
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- Lawrence Livermore National Lab., CA (United States)
- Istituto Nazionale di Fisica Nucleare, Frascati (Italy). Lab. Nazionale di Frascati
The key elements of the PEP 11 approach to dealing with the problem of coupled-bunch instabilities are presented. The approach involves using warm copper RF cavities with damping waveguides (above the cutoff of the fundamental) attached to the cavity walls. These couple out the troublesome higher-order modes (HOMs) into absorbing loads, while the fundamental mode remains in the cavity. The Q of the worst HOM is reduced to below 70. Instabilities due to residual coupling are damped using a bunch-by-bunch feedback system, which is implemented using digital signal processors. A prototype cavity has been built and the concept of HOM damping has been verified. A prototype feedback system has been built and tested at SPEAR. Results to date indicate that the combination of damped cavities and bunch-by-bunch feedback provide a very effective means of dealing with the problem.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6767217
- Report Number(s):
- SLAC-PUB-5979; LBL--33525; CONF-921122--28; ON: DE93007175
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
BEAM BUNCHING
BEAM DYNAMICS
DESIGN
ELECTRON-POSITRON INTERACTIONS
FEEDBACK
INSTABILITY
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
PARTICLE INTERACTIONS
PEP STORAGE RINGS
RF SYSTEMS
STORAGE RINGS
WAVEGUIDES