Analysis of DSP-based longitudinal feedback system: Trials at SPEAR and ALS
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- 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
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