The Effect of Photo-Neutrons on Diagnostics Using CR-39 for Laser-Accelerated Ion Beam

Masato Kanasaki; Masato Kanasaki; Yuji Fukuda; Hironao Sakaki; Akifumi Yogo; Satoshi Jinno; Mamiko Nishiuchi; Atsuto Hattori; Kenya Matsukawa; Kiminori Kondo; Keiji Oda; Tomoya Yamauchi

2013 Conference on Lasers and Electro-Optics Pacific Rim
(Optica Publishing Group, 2013),
paper MD1_8

The Effect of Photo-Neutrons on Diagnostics Using CR-39 for Laser-Accelerated Ion Beam

Masato Kanasaki, Yuji Fukuda, Hironao Sakaki, Akifumi Yogo, Satoshi Jinno, Mamiko Nishiuchi, Atsuto Hattori, Kenya Matsukawa, Kiminori Kondo, Keiji Oda, and Tomoya Yamauchi

Conference on Lasers and Electro-Optics/Pacific Rim 2013

Kyoto Japan
30 June–4 July 2013
ISBN: 978-1-4673-6475-1

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High Power Lasers and Applications I (MD1)

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M. Kanasaki, Y. Fukuda, H. Sakaki, A. Yogo, S. Jinno, M. Nishiuchi, A. Hattori, K. Matsukawa, K. Kondo, K. Oda, and T. Yamauchi, "The Effect of Photo-Neutrons on Diagnostics Using CR-39 for Laser-Accelerated Ion Beam," in 2013 Conference on Lasers and Electro-Optics Pacific Rim, (Optica Publishing Group, 2013), paper MD1_8.

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Abstract

In laser-driven ion acceleration experiments applying cluster-gas targets, a significant amount of high energy electrons are produced. Such fast electrons can produce photo-neutrons via bremsstrahlung processes followed by (γ,n) reactions. When the CR-39 is exposed to photo-neutrons, it records etchable tracks of generated ions depending on their species and energy as background noises. To minimize the effect of photo-neutrons, the configuration of the CR-39 detector unit and beam dump for high energy electrons has been examined by Monte Carlo simulations. As a result, we have found the suitable configuration for CR-39 to detect only laser-accelerated ions with less contaminant by photo-neutrons in one laser shot.

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