Muon Accelerator Program (MAP)

U.S. Department of Energy

Muon Accelerator Program Document 4336-v1

DESIGN OF ACCUMULATOR AND COMPRESSOR RINGS FOR THE PROJECT-X BASED PROTON DRIVER

Document #:
MAP-doc-4336-v1
Document type:
Paper
Submitted by:
David V Neuffer
Updated by:
David V Neuffer
Document Created:
25 Jun 2012, 15:35
Contents Revised:
25 Jun 2012, 15:35
DB Info Revised:
25 Jun 2012, 15:35
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Abstract:
A Muon Collider (MC) and a Neutrino Factory (NF) - which may be considered as a step towards a MC - both require a high-power (~4 MW) proton driver providing short (<1 m r.m.s. length) bunches for muon production. However, the driver repetition rates required for these two machines are different: ~15 Hz for MC and ~60 Hz for NF. This difference suggests employing two separate rings: one for accumulation of the proton beam from the Project-X linac in a few (e.g. 4) long bunches, the other for bunch compression - one by one for NF or all at a time for MC with simultaneous delivery to the target. The lat-tice requirements for these two rings are different: the momentum compaction factor in the accumulator ring should be large (and possibly negative) to avoid the mi-crowave instability, while the compressor ring can be nearly isochronous in order to limit the required RF volt-age and reduce the dispersion contribution to the beam size. In the present report we consider ring lattice designs which achieve these goals.
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