Phasing schemes for CEBAF cavities
The CEBAF accelerator requires accurate phasing of the 338 superconducting cavities to achieve the design rms energy spread of 2.5 X 10{sup {minus}5}. The rms phase error along each linac, with 160 cavities over a length of 200 m, may not exceed 2.6 degrees, assuming that the whole linac is operated on crest. The common procedure is to maximize the energy gain with a spectrometer. At CEBAF, however, phase-dependent cavity steering effects cause deflections of the beam of several mrad, requiring steering corrections in the linac, which makes this method very time consuming. Beam-induced transients can also be used in pulsed operation to determine the zero-energy-gain phase with high accuracy. Better than 2 degrees accuracy is achieved when the signal-to-noise ratio is improved by signal averaging. These and other approaches for the phasing of cavities are compared and accuracy and feasibility are discussed.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 758740
- Report Number(s):
- CEBAF-PR-93-015; DOE/ER/40150-1723; TRN: AH200023%%39
- Resource Relation:
- Conference: PAC 1993, Washington DC (US), 05/17/1993--05/20/1993; Other Information: PBD: 1 May 1993
- Country of Publication:
- United States
- Language:
- English
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