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Neutrino Factory/Muon Collider Document 148-v1

The Low Proton Energy Option and two Geant4-based Studies.

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MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
07 Aug 2000, 12:00
Contents Revised:
07 Aug 2000, 12:00
Metadata Revised:
07 Aug 2000, 12:00
Actually Revised:
14 Sep 2006, 13:35
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The use of a low energy (~ 1 GeV, kinetic energy ) proton or deuteron
beam to produce muon beams is once again open to discussion. A justification
is briefly outlined and preliminary results based on detailed simulation for
two critical components are presented. Geant4, properly adapted to the problem,
is used to trace charged particles and to simulate pion production. It is
found that a scheme based on the use of low energy proton beam would alleviate
two distinct problems encountered in the FNAL neutrino factory feasibility:
(i) excessive heat and activation of the target and surrounding equipment (the
bitter magnet in particular) (ii) a lower field (~ 4. Tesla) can be
used to collect pions, thanks to the lower transverse emittance of the emerging
pion beam. (iii)a much reduced 6D-emittance of the muon beam emerging from the
decay channel, opening a possibility for an easier, or more efficient design of
the cooling channel. However, stringent limitations will come from space charge
effects in the low energy proton accumulator, which can not be effectively
dealt with by increasing the proton transverse emittance above a
few hundred mm. mRad. The longitudinal space charge problem becomes critical
during the last bunch compression. A linear transport with beam charge
neutralization has to be proposed. However, a strong ``two stream"
instability develops and will significantly perturb the bunch. Hence, the
only reliable way to mitigate space charge is to increase the number of
micro-bunches, ultimately lengthening the macro muon bunch(es), or increasing
the repetition cycle of the accelerator complex.

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Posted by Paul Lebrun

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