Abstract
A new scheme to produce very low emittance muon beams using a positron beam of about 45~GeV interacting on electrons on target is presented. One of the innovative topics to be investigated is the behaviour of the positron beam stored in a low emittance ring with a thin target, that is directly inserted in the ring chamber to produce muons. Muons can be immediately collected at the exit of the target and transported to two $\mu^+$ and $\mu^-$ accumulator rings and then accelerated and injected in muon collider rings. We focus in this paper on the simulation of the e$^+$ beam interacting with the target, the effect of the target on the 6-D phase space and the optimization of the e$^+$ ring design to maximize the energy acceptance. We will investigate the performance of this scheme, ring plus target system, comparing different multi-turn simulations. The source is considered for use in a multi-TeV collider in ref.[1]
Highlights
Muon beams are customarily obtained via K=π decays produced in proton interaction on target
We focus in this paper on the simulation of the eþ beam interacting with the target, the effect of the target on the 6-D phase space and the optimization of the eþ ring design to maximize the energy acceptance
This scheme foresees muons produced by the interaction of positrons circulating in a storage ring on target at ∼22 GeV, muons are accumulated in isochronous rings with a circumference of ∼60 m with 13 T dipoles
Summary
Muon beams are customarily obtained via K=π decays produced in proton interaction on target. In this paper we will investigate the possibility to produce low emittance muon beams from a novel approach, using electron-positron collisions at a center-of-mass energy just above the μþμ− production threshold with minimal muon energy spread, corresponding to the direct annihilation of approximately 45 GeV positrons and atomic electrons in a thin target, Oð0.01 ∼ radiation lengthsÞ. Concept studies on this subject are reported in Refs. A preliminary proposal for a 14 TeV CERN muon collider has been described in Ref [1]
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