Feedback control and beam diagnostic algorithms for a multiprocessor DSP system

Conference · Sun Sep 01 04:00:00 EDT 1996

OSTI ID:486210

Teytelman, D; Claus, R; Fox, J; Hindi, H; Linscott, I; Prabhakar, S ^[1]; Drago, A ^[2]; Stover, G ^[3]

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1. Stanford Univ., CA (United States). Stanford Linear Accelerator Center
2. INFN, Roma (Italy). Lab. Nazionali di Frascati
3. Lawrence Berkeley Lab., CA (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 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 320 K samples of data collected in one beam transient measurement are discussed and the 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.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 486210
• Report Number(s): SLAC-PUB--7305; LBNL--39363; CONF-9605173--19; ON: DE97007672
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED LIGHT SOURCE
ALGORITHMS
ARRAY PROCESSORS
BEAM DYNAMICS
BEAM MONITORING
COMPUTERIZED CONTROL SYSTEMS
DAMPING
DATA ACQUISITION SYSTEMS
FEEDBACK