著者

Yasunobu ARIKAWA Yusuke KATO Yuki ABE Shuto MATSUBARA Hidetaka KISHIMOTO Nozomi NAKAJIMA Alessio MORACE Akifumi YOGO Hiroaki NISHIMURA Mitsuo NAKAI Shinsuke FUJIOKA Hiroshi AZECHI Kunioki MIMA Shunsuke INOUE Yoshihide NAKAMIYA Kensuke TERAMOTO Masaki HASHIDA Shuji SAKABE

出版者

The Japan Society of Plasma Science and Nuclear Fusion Research

雑誌

Plasma and Fusion Research (ISSN:18806821)

巻号頁・発行日

vol.13, pp.2404009, 2018-02-15 (Released:2018-03-27)

参考文献数

18

被引用文献数

3

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A short and high-intensity neutron pulse can be produced efficiently by using photonuclear reactions caused by Bremsstrahlung hard X-rays in a lase-irradiated high-Z target. The efficient and repetitive neutron generation was demonstrated with the combination of 1 Hz, 0.5 J, 25 fs, 5 × 1019 W/cm2 laser pulses and a rotating tungsten disc targe. Here we applied double laser pulse irradiation scheme to increase the neutron generation efficiency. The first low-intensity laser pulse produces a long-scale under-critical-density plasma on the tungsten target surface prior to the second pulse irradiatio. High energy electrons above the ponderomotive scaling value are accelerated by the second hig-intensity pulse in the preformed plasm, this results in the increment of hard X-ray photons and photonuclear neutron. 3.5 × 104 neutron/pulse was obtained with optimized laser irradiation conditions.