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Antognini, A.; Ayres, N. J.; Belosevic, I.; Bondar, V.; Eggenberger, A.; Hildebrandt, M.; Iwai, R.; Kaplan, D. M.; Khaw, K. S.; Kirch, K.; Knecht, A.; Papa, A.; Petitjean, C.; Phillips, T. J.; Piegsa, F. M.; Ritjoho, N.; Stoykov, A.; Taqqu, D.; Wichmann, G.
Physical review letters, 10/2020, Letnik: 125, Številka: 16Journal Article
We demonstrate efficient transverse compression of a 12.5 MeV/c muon beam stopped in a helium gas target featuring a vertical density gradient and crossed electric and magnetic fields. The muon stop distribution extending vertically over 14 mm was reduced to a 0.25 mm size (rms) within 3.5 μs. The simulation including cross sections for low-energy μ+-He elastic and charge exchange (μ+↔ muonium) collisions describes the measurements well. By combining the transverse compression stage with a previously demonstrated longitudinal compression stage, we can improve the phase space density of a μ+ beam by a factor of 1010 with 10−3 efficiency.
