Instrumentation and diagnostics for PEP-II
PEP-II is a 2.2-km-circumference collider with a 2.1-A, 3.1-GeV positron ring (the Low-Energy Ring) 1 m above a 1-A, 9-GeV electron ring (the High-Energy Ring); both rings are designed to allow an upgrade to 3 A. Since June 1997, the author has had three runs totaling 14 weeks to commission the full HER, reaching a current of 0.75 A. Positrons were transported through the first 90 m of the LER in January 1998, with full-ring tests planned for the summer. This workshop provides a timely opportunity to review the design of the beam diagnostics and their performance, with an emphasis on what works, what doesn't, and what is being done to improve it. This paper discusses: the synchrotron-light monitor, including both transverse imaging onto a CCD camera and longitudinal measurements with a streak camera; beam-position monitors, with processors capable of 1,024-turn records, FFTs, and phase-advance measurements; tune measurements with a spectrum analyzer, including software for peak tracking; measurements of both the total ring current and the charge in each bucket, for real-time control of the fill; and beam-loss monitors using small Cherenkov detectors for measuring losses from both stored and injected beam.
- Research Organization:
- Stanford Univ., Stanford Linear Accelerator Center, CA (US); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (US)
- DOE Contract Number:
- AC03-76SF00515; AC03-76SF00098
- OSTI ID:
- 666109
- Report Number(s):
- SLAC-PUB-7835; CONF-980573-; ON: DE98059229; TRN: US200305%%1133
- Resource Relation:
- Conference: 8. beam instrumentation workshop (BIW-98), Stanford, CA (US), 05/04/1998--05/07/1998; Other Information: Supercedes report DE98059229; PBD: May 1998; PBD: 1 May 1998
- Country of Publication:
- United States
- Language:
- English
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Instrumentation and diagnostics for PEP-II
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