Abstract
Although Japan's unique FFAG scenario for a neutrino factory does not rely on ionization cooling of the muon beam, moderate cooling in the first FFAG could be beneficial for the overall muon yield and, perhaps even more important, reduce the final emittances in the decay ring. Using basic cooling theory, one can show that this appears possible. In the Nufact'01 contribution on ‘ionization cooling in FFAGs’ [1], the addition of absorbers into the superconducting 0.3–1 GeV/c Japanese FFAG was investigated. The cooling absorbers were 7 mm beryllium sheets in the median plane of the RF cavities. Beryllium was chosen because Be windows are a known design to increase field strength and quality of large aperture cavities. Obviously metallic lithium or a sandwich of lithium hydride between thin metallic Be sheets is preferable to the cooling viewpoint. We have thus complemented the results for Be by equivalent inserts of pure lithium and lithium hydride. For each material two thicknesses were compared.
Published Version
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