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1 Towards the Optimal Energy of the Proton Driver for a

By J. Strait, N. V. Mokhov and S. I. StriganovNeutrino Factory, Muon Collider, J. Strait, N. V. Mokhov and S. I. Striganov


Cross-section data from the HARP experiment for pion production by protons from a tantalum target have been convoluted with the acceptance of the front-end channel for the proposed neutrino factory or muon collider and integrated over the full phase space measured by HARP, to determine the beam-energy dependence of the muon yield. This permits a determination of the optimal beam energy for the proton driver for these projects. The cross-section data are corrected for the beamenergy dependent “amplification ” due to the development of hadronic showers in a thick target. The conclusion is that, for constant beam power, the yield is maximum for a beam energy of about 7 GeV, but it is within 10 % of this maximum for 4 < Tbeam < 11 GeV, and within 20 % of the maximum for Tbeam as low as 2 GeV. This result is insensitive to which of the two HARP groups’ results are used, and to which pion generator is used to compute the thick target effects. PACS numbers: 29.20.db, 29.27.Eg, 25.40.Qa, 13.20.Cz 1

Year: 2010
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