Muon Accelerator Program (MAP)

U.S. Department of Energy

Muon Accelerator Program Document 4301-v4

Accumulator/Compressor Ring with Negative Momentum Compaction Factor

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Submitted by:
Yuri Alexahin
Updated by:
Yuri Alexahin
Document Created:
28 Jul 2011, 09:48
Contents Revised:
13 Oct 2011, 13:41
DB Info Revised:
13 Oct 2011, 13:41
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17 Aug 2011, 15:38
04 Aug 2011, 13:25
28 Jul 2011, 09:48
A lattice design is presented of a ring for accumulation of 8 GeV protons from Project-X linac and compression into 4-8 short (sigma_t~2ns) bunches. Large negative momentum compaction factor (alfa_c=-0.12) raises the microwave instability threshold well above the design parameter range for accumulated beam. Large average dispersion function and absence of dispersion-free straights reduce the space-charge tuneshifts below 0.1. However, there can be problems with extraction of compressed bunches due to large horizontal beam size, so a section with reduced dispersion function should be added in the next version of the ring.
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