Multiple error data analysis for RHIC low-energy operations [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2011.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Additional Creators:
- Brookhaven National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- In FY10, RHIC operated with gold beams at three different energies below its regular injection energy, namely at √s = 5 GeV; 7.7 GeV; and 11.5 GeV: While beam lifetimes of about 10 minutes were achieved at 11.5 GeV and 7.7 GeV; leading to stable collider operation, beam lifetimes during tests at √s = 5 GeV were only of the order of several seconds. Though space charge effects are a major concern in low energy operations due to the 1/γ² scaling of the space charge force, these can effectively be ruled out as the main cause of this abysmal performance because of the tiny bunch intensities of approximately 10₈ Au/bunch, compared to 10⁹ Au/bunch at the two higher energies. During these 5 GeV tests, large betatron tune spreads were observed, but the extremely short beam lifetime prevented chromaticity measurements. Instead, chromaticities were scanned over a range of 40 units, but to no effect. It was therefore suspected at that time that the large tune spread was caused by higherorder multipole errors in the RHIC magnets.
- Published through SciTech Connect.
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