Analysis of DSP-based longitudinal feedback system: Trials at SPEAR and ALS

Conference · Thu Apr 01 04:00:00 EST 1993

OSTI ID:10187773

Hindi, H; Eisen, N; Fox, J; Linscott, I; Oxoby, G; Sapozhnikov, L ^[1]; Serio, M ^[2]

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1. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
2. Istituto Nazionale di Fisica Nucleare, Frascati (Italy). Lab. Nazionale di Frascati

Recently a single-channel prototype of the proposed PEP-II longitudinal feedback system was successfully demonstrated at SPEAR and ALS on single-bunch beams. The phase oscillations are detected via a wide-band pick up. The feedback signal is then computed using a digital signal processor (DSP) and applied to the beam by phase modulating the rf. We analyze results in the frequency- and the time-domain and show how the closed-loop transfer functions can be obtained rigorously by proper modeling of the various components of this hybrid continuous/digital system. The technique of downsampling was used in the experiments to reduce the number of computations and allowed the use of the same digital hardware on both machines.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 10187773
• Report Number(s): SLAC-PUB--6151; CONF-930511--477; ON: DE93041055
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303
ADVANCED LIGHT SOURCE
BEAM BUNCHING
EXPERIMENTAL FACILITIES AND EQUIPMENT
FEEDBACK
FREQUENCY DEPENDENCE
SPEAR
TRANSFER FUNCTIONS