Abstract
An optimized design of the solenoidal capture system for a high-power neutrino factory leads to an increase of the useful pions, while minimizing the transverse and longitudinal emittances.
Highlights
Proposed muon accelerators, which include the muon colliders and neutrino factories, use intense muon beams to study the physics of elementary particles at both the intensity and energy frontiers
We have examined how the performance of a solenoid based capture channel is determined by the longitudinal profile of that field for a beam with large initial energy spread and transverse momentum spread
We have shown that the capture efficiency and transverse emittance are improved near the target by using high fields at the target
Summary
Proposed muon accelerators, which include the muon colliders and neutrino factories, use intense muon beams to study the physics of elementary particles at both the intensity and energy frontiers. The front end of a muon accelerator should capture a large fraction of these pions and manipulate their phase space to achieve a smaller energy spread It should maximize the number of muons that are accepted by the downstream cooling and/or acceleration systems, thereby increasing the luminosity of the muon collider or the neutrino flux of the neutrino factory. In [8] the capture solenoid field profile was examined, and it was found that the performance could be improved with a long adiabatic taper The results of these studies were incorporated in a subsequent neutrino factory design [9], demonstrating an approximately 10% performance improvement over a longitudinal profile based on [7]. III B it is shown that a shorter taper increases the number of muons y [m]
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