LATTICE WITH SMALLER MOMENTUM COMPACTION FACTOR FOR PEP-II HIGH ENERGY RING
At present, the PEP-II bunch length and vertical beta function {beta}*{sub y} at the Interaction Point (IP) are about of the same size. To increase luminosity, it is planned to gradually reduce {beta}*{sub y}. For the maximum effect, bunch length has to be also reduced along with {beta}*{sub y} to minimize luminosity loss caused by the hourglass effect at IP. One of the methods to achieve a smaller bunch length is to reduce momentum compaction factor. This paper discusses a lattice option for the High Energy Ring, where the nominal 60{sup o} cells in four arcs are replaced by 90{sup o} cells to reduce momentum compaction factor by 30% and bunch length by 16%. The increased focusing in 90{sup o} cells results in 40% stronger arc quadrupoles and 150% stronger arc sextupoles due to reduced dispersion and larger chromaticity. Tracking simulations predict that dynamic aperture for this lattice will be {ge} 10 times the rms size of a fully coupled beam for a horizontal emittance of 30 nm and {beta}*{sub y} = 1 cm. The lattice modification and results of simulations are presented.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 813104
- Report Number(s):
- SLAC-PUB-9810; TRN: US0303659
- Resource Relation:
- Other Information: Paper presented at the 2003 Particle Accelerator Conference, Portland, OR (US), 05/12/2003--05/16/2003; PBD: 13 May 2003
- Country of Publication:
- United States
- Language:
- English
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