The Center-or-Mass Energy of PEP-II
- SLAC
The PEP-II B-factory is designed to operate at a center-of-mass energy (E{sub cm}) of 10.58 GeV, the mass value of the upsilon 4S resonance. It is important to set and maintain the E{sub cm} to the peak of this resonance in order to maximize the production of B mesons that enable the BaBar detector to measure CP violation. There are several elements in the determination of the beam energies. Aside from the strength of the main bending magnets, there is a contribution to the beam energy from horizontal correctors. In addition, the frequency of the RF system also influences the ring energies by controlling the closed orbit circumference. The low-energy ring (LER) in PEP-II has a wiggler magnet for emittance control that also contributes to the beam energy of the LER. We discuss these aspects of beam energy determination and the algorithms used to monitor the beam energies.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 798889
- Report Number(s):
- SLAC-PUB-9018
- Country of Publication:
- United States
- Language:
- English
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