dorsal/arxiv
View SchemaMuon Acceleration using Fixed Field, Alternating Gradient (FFAG) Rings
| Authors | D. J. Summers |
|---|---|
| Categories | |
| ArXiv ID | physics/0411218 |
| URL | https://arxiv.org/abs/physics/0411218 |
| DOI | 10.1142/S0217751X05027813 |
| Journal | Int.J.Mod.Phys.A20:3861-3864,2005 |
Abstract
Given their 2.2 microsecond lifetime, muons must be accelerated fairly rapidly for a neutrino factory or muon collider. Muon bunches tend to be large. Progress in fixed field, alternating gradient (FFAG) lattices to meet this challenge is reviewed. FFAG magnets are naturally wide; low momentum muons move from the low field side of a gradient magnet to the high field side as they gain energy. This can be exploited to do double duty and allow a large beam admittance without unduly increasing the magnetic field volume. If the amount of RF must be reduced to optimize cost, an FFAG ring can accommodate extra orbits. I describe both scaling FFAGs in which the bends in each magnet are energy independent and non-scaling FFAGs in which the bends in each magnet do vary with muon energy. In all FFAG designs the sum of the bends in groups of magnets are constant; otherwise orbits would not close. Ways of keeping the accelerating beam in phase with the RF are described. Finally, a 1 MeV proof of principle scaling FFAG has been built at KEK and began accelerating protons in June 2000 with a 1 kHz repetition rate.
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"abstract": "Given their 2.2 microsecond lifetime, muons must be accelerated fairly\nrapidly for a neutrino factory or muon collider. Muon bunches tend to be large.\nProgress in fixed field, alternating gradient (FFAG) lattices to meet this\nchallenge is reviewed. FFAG magnets are naturally wide; low momentum muons move\nfrom the low field side of a gradient magnet to the high field side as they\ngain energy. This can be exploited to do double duty and allow a large beam\nadmittance without unduly increasing the magnetic field volume. If the amount\nof RF must be reduced to optimize cost, an FFAG ring can accommodate extra\norbits. I describe both scaling FFAGs in which the bends in each magnet are\nenergy independent and non-scaling FFAGs in which the bends in each magnet do\nvary with muon energy. In all FFAG designs the sum of the bends in groups of\nmagnets are constant; otherwise orbits would not close. Ways of keeping the\naccelerating beam in phase with the RF are described. Finally, a 1 MeV proof of\nprinciple scaling FFAG has been built at KEK and began accelerating protons in\nJune 2000 with a 1 kHz repetition rate.",
"arxiv_id": "physics/0411218",
"authors": [
"D. J. Summers"
],
"categories": [
"physics.acc-ph",
"hep-ex"
],
"doi": "10.1142/S0217751X05027813",
"journal_ref": "Int.J.Mod.Phys.A20:3861-3864,2005",
"title": "Muon Acceleration using Fixed Field, Alternating Gradient (FFAG) Rings",
"url": "https://arxiv.org/abs/physics/0411218"
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