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The photonuclear neutron and gamma-ray backgrounds in the fast ignition experiment
1Institute of Laser Engineering, Osaka University, Yamadaoka Suita, Japan. arikawa-y@ile.osaka-u.ac.jp
Abstract:
In the fast-ignition scheme, very hard x-rays (hereinafter referred to as γ-rays) are generated by Bremsstrahlung radiation from fast electrons. Significant backgrounds were observed around the deuterium-deuterium fusion neutron signals in the experiment in 2010. In this paper the backgrounds were studied in detail, based on Monte Carlo simulations, and they were confirmed to be γ-rays from the target, scattered γ-rays from the experimental bay walls (γ'-rays), and neutrons generated by (γ, n) reactions in either the target vacuum chamber or the diagnostic instruments (γ-n neutrons).
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