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Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

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32 Author(s)
Nishiuchi, M. ; Advanced Photon Research Center and Photo Medical Research Center, Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1 Umemi-dai, Kizugawa, Kyoto 619-0215, Japan ; Daito, I. ; Ikegami, M. ; Daido, H.
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A pair of conventional permanent magnet quadrupoles is used to focus a 2.4 MeV laser-driven proton beam at a 1 Hz repetition rate. The magnetic field strengths are 55 and 60 T/m for the first and second quadrupoles, respectively. The proton beam is focused to a spot with a size of less than ∼3×8 mm2 at a distance of 650 mm from the source. This result is in good agreement with the Monte Carlo particle trajectory simulation.

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Applied Physics Letters  (Volume:94 ,  Issue: 6 )