The dependence of the dynamic aperture on the tune in RHIC
This note studies the dependence of the dynamic aperture on the choice of the operating tune {nu}{sub x}, {nu}{sub y} in RHIC. Tracking studies for 1000 turns were done over the tune range {nu}{sub x} {approx_equal} {nu}{sub y} = 28 to {nu}{sub x} {approx_equal} {nu}{sub y} = 29.5. It was found that in each tune interval of length {Delta}{nu} = 0.5, e.g. {nu} = 28.5 to {nu} = 29, the dynamic aperture as a function of the tune has 5 peaks, each of which is a possible operating point. Each of these possible operating points is in a tune region free of imperfection resonances of tenth order or less, and the width of this tune region ranges from {Delta}{nu} = 0.022 to {Delta}{nu} = 0.036. Operating tunes near integer values of {nu}, which appear desirable because of the relatively large tune interval free of imperfection resonances of 10th order or less, may not be desirable because of the lower dynamic aperture in this region. Operating near integer tunes may not be desirable for heavy ions like Au, but may be desirable for the lighter ions which do not experience a large transverse growth due to intrabeam scattering. If a loss in dynamic aperture of 2 mm is regarded as significant, then the tune range of {nu} = 28 to {nu} 28.5 does not appear as attractive as the tune range {nu} = 28.5 to {nu} = 29.5.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 10132209
- Report Number(s):
- BNL-47209; AD/RHIC-107; ON: DE92010181
- Resource Relation:
- Other Information: PBD: Feb 1992
- Country of Publication:
- United States
- Language:
- English
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The dependence of the dynamic aperture on the tune in RHIC
The dependence of the dynamic aperture on the tune in RHIC