Feedback control and beam diagnostic algorithms for a multiprocessor DSP 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 multibunch longitudinal feedback system developed for use by PEP-II, ALS, and DA{Phi}NE uses a parallel array of digital signal processors (DSPs) to calculate the feedback signals from measurements of beam motion. The system is designed with general-purpose programmable elements which allow many feedback operating modes as well as system diagnostics, calibrations, and accelerator measurements. The overall signal processing architecture of the system is illustrated. The real-time DSP algorithms and off-line postprocessing tools are presented. The problems in managing 320k samples of data collected in one beam transient measurement are discussed and our solutions are presented. Example software structures are presented showing the beam feedback process, techniques for modal analysis of beam motion (used to quantify growth and damping rates of instabilities), and diagnostic functions (such as timing adjustment of beam pick-up and kicker components). These operating techniques are illustrated with example results obtained from the system installed at the Advanced Light Source at LBL. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Stanford Linear Accelerator Center
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 565413
- Report Number(s):
- CONF-9605173--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 390; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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