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

Nishiuchi, Mamiko; Daito, Izuru; Ikegami, Masahiro; Daido, Hiroyuki; Mori, Michiaki; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Pirozhkov, A. S.; Sugiyama, Hironori*; Kiriyama, Hiromitsu; Okada, Hajime; Kanazawa, Shuhei; Kondo, Shuji; Shimomura, Takuya; Tanoue, Manabu*; Nakai, Yoshiki; Sasao, Hajime; Wakai, Daisuke*; Sakaki, Hironao; Bolton, P. R.; Choi, I. W.*; Sung, J. H.*; Lee, J.*; Oishi, Yuji*; Fujii, Takashi*; Nemoto, Koshichi*; Soda, Hikaru*; Noda, Akira*; Iseki, Yasushi*; Yoshiyuki, Takeshi*

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 T/m and 60 T/m for the first and second quadrupoles respectively. The proton beam is focused to a spot size (full width at half maximum) of 2.7$$times$$8 mm$$^{2}$$ at a distance of 650 mm from the source. This result is in good agreement with a Monte Carlo particle trajectory simulation.

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Category:Physics, Applied

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