Observation, control, and modal analysis of longitudinal coupled-bunch instabilities in the ALS via a digital feedback system
- Stanford Linear Accelerator Center, P.O. Box 4349, Stanford, California 94309 (United States)
- INFN-Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati (Roma) (Italy)
- Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94563 (United States)
The operation of a longitudinal multibunch damping system using digital signal processing (DSP) techniques is shown via measurements from the Lawrence Berkeley Laboratory (LBL) Advanced Light Source (ALS). The feedback system (developed for use by PEP-II, ALS, and DA{Phi}NE) uses a parallel array of signal processors to implement a bunch-by-bunch feedback system for sampling rates up to 500 MHz. The programmable DSP system allows feedback control as well as accelerator diagnostics. A diagnostic technique is illustrated which uses the DSP system to excite and then damp the beam. The resulting 12-ms time domain transient is Fourier analyzed to provide the simultaneous measurement of growth rates and damping rates of all unstable coupled-bunch beam modes. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 565405
- Report Number(s):
- CONF-9605173-; ISSN 0094-243X; TRN: 98:002415
- Journal Information:
- AIP Conference Proceedings, Vol. 390, Issue 1; Conference: 7. workshop on beam instrumentation, Argonne, IL (United States), 6-9 May 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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