title: The photonuclear neutron and gamma-ray backgrounds in the fast ignition experiment.
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).
authors.affiliation: Institute of Laser Engineering, Osaka University, Yamadaoka Suita, Japan. arikawa-y@ile.osaka-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Arikawa
authors.forename: T
authors.initials: T
authors.lastname: Nagai
authors.forename: H
authors.initials: H
authors.lastname: Hosoda
authors.forename: Y
authors.initials: Y
authors.lastname: Abe
authors.forename: S
authors.initials: S
authors.lastname: Kojima
authors.forename: S
authors.initials: S
authors.lastname: Fujioka
authors.forename: N
authors.initials: N
authors.lastname: Sarukura
authors.forename: M
authors.initials: M
authors.lastname: Nakai
authors.forename: H
authors.initials: H
authors.lastname: Shiraga
authors.forename: T
authors.initials: T
authors.lastname: Ozaki
authors.forename: H
authors.initials: H
authors.lastname: Azechi