巻号一覧
43 巻, 2 号
「レーザー駆動中性子源の開発と応用」特集号
選択された号の論文の9件中1～9を表示しています
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「レーザー駆動中性子源の開発と応用」特集号
特 集
レーザー解説
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西村 博明2015 年 43 巻 2 号 p. 70-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスPDF形式でダウンロード (252K) -
大竹 淑恵2015 年 43 巻 2 号 p. 71-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスA large-scale neutron imaging method using fast neutrons of over 1 MeV is being developed for nondestructive inspection of infrastructure. Development of compact neutron source and large area fast neutron detector in RIKEN is discussed. Different number of the steel bars, voids, and existence of water in 30 cm thick concrete are clearly observed.抄録全体を表示PDF形式でダウンロード (2272K) -
掛布 光孝2015 年 43 巻 2 号 p. 77-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスNew applications of LDNS (Laser-Driven Neutron Sources) are described. One of them is ib-DATA (inbeam Double Activation Tracer Analysis) with which we can measure mean drift velocity and mass flow rate in a variety of fluid. In ib-DATA, LDNS with very light and compact beam-head will be constructed to shoot pulsed neutrons into the fluid in pinpoint.抄録全体を表示PDF形式でダウンロード (704K) -
阪部 周二, 橋田 昌樹2015 年 43 巻 2 号 p. 82-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスTo discuss the feasibility of compact neutron sources the yield of laser produced neutrons is scaled by the laser energy. High-energy ions are generated by Coulomb explosion of clusters through intense femtoseocnd laser- cluster interactions. The laser energy scaling law of the neutron yield is estimated using the laser intensity scaling law for the energy of ions emitted from clusters Coulomb-exploded by an intense laser pulse. The neutron yield for D (D, n) He shows the potential of compact neutron sources with modern laser technology, and the yield for p (Li, n) Be shows much higher than that for Li (p, n) Be with the assumption of 500 nm-class cluster Coulomb explosion.抄録全体を表示PDF形式でダウンロード (897K) -
Yoneyoshi KITAGAWA2015 年 43 巻 2 号 p. 88-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスPellet injection and repetitive laser illumination are key technologies for realizing inertial fusion energy. The Graduate School for the Creation of New Photonics Industries, Hamamatsu Photonics K. K. and Toyota Motor Corporation demonstrate the pellet injection, counter laser beams’ engagement and neutron generation. Deuterated polystyrene (CD) bead pellets, after free-falling for a distance of 18 cm at 1 Hz, are successfully engaged by two counter laser beams from a diode-pumped, ultra-intense laser HAMA. The laser energy, pulse duration, wavelength and the intensity are 0.63 J per beam, 104 fs, 811 nm and 4.7 × 1018 W/cm2, respectively. The irradiated pellets produce D (D, n)3 He-reacted neutrons with a maximum yield of 9.5 × 104/4π sr/shot. A straight channel with 10 μm-diameter is found through the beads. The pellet size is 1 mm. The results indicate potentially useful technologies for the next step in realizing inertial fusion energy. The results are reviewed as well as some oversea activities.抄録全体を表示PDF形式でダウンロード (930K) -
Markus ROTH2015 年 43 巻 2 号 p. 93-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスUltra-intense lasers have demonstrated the capability of accelerating short pulses of intense ion beams. These ion beams have been used to generate short bursts of neutrons by irradiating a converter in close distance to the source, making this scheme a very compact and bright source of neutrons up to more than 100 MeV in energy. Using novel laser ion acceleration mechanisms directed beams of neutrons can be generated, which increases the brightness of these sources compared to previous attempts. We review the recent research and present experimental data using a mechanism based on relativistic transparency to drive the most intense laser driven neutron source and use them for first applications.抄録全体を表示PDF形式でダウンロード (880K) -
中井 光男, 有川 安信, 宇津木 卓, 西村 博明, 宮永 憲明, 疇地 宏, Hui CHEN2015 年 43 巻 2 号 p. 98-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスIt has been demonstrated that laser-driven high-energy x-ray source could be an approvable candidate for a neutron source with flat energy spectrum. A gold disk target was irradiated by a kJ pulse from the high power laser system (LFEX) at Osaka University to show the neutron generation of 8 × 108. Generation of high energy x-ray component with higher temperature necessary for neutron generation via photonuclear reaction is attributed to interaction of laser with the long scale preformed plasma.抄録全体を表示PDF形式でダウンロード (1246K) -
有川 安信, 長井 隆浩, 安部 勇輝, 宇津木 卓, 山ノ井 航平, 清水 俊彦, 猿倉 信彦, 西村 博明, 中井 光 ...2015 年 43 巻 2 号 p. 103-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスThe sciences of laser produced neutron sources, including the laser-fusion, the laser photonuclear neutron generation, the neutron generation via p-Li or p-Be reaction by using laser accelerated protons, require neutron diagnostic tools which were specifically designed for a hard X-ray background environment. Especially in the kJ class ultra-intense laser facility such as LFEX, the X-ray energy exceeds tens of MeV. They create a large number of photonuclear neutron from the surrounding constructions such as vacuum chamber. In this paper the development of neutron time of flight(TOF)detector is described. The neutron detector is constructed with a fast response liquid scintillator and a gated-photomultiplier tube, and they are shielded from background neutrons by means of a concrete collimator.抄録全体を表示PDF形式でダウンロード (704K)
レーザーオリジナル
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川嶋 利幸, 渡利 威士, 関根 尊史, 松門 宏治, 西原 功修, Masaru TAKAGI, Ryo YOSHIMURA, ...2015 年 43 巻 2 号 p. 108-
発行日: 2015年
公開日: 2020/12/17
ジャーナル オープンアクセスWe propose a novel neutron source technique using ultra-high intensity laser based on the cluster fusion scheme. We have developed the high-repetition rate 20 TW ultra-short pulse laser system MATSU-1 pumped by the efficient diode-pumped high energy solid-state laser KURE-1. Irradiating the ultra-high intensity of > 2 × 1018 W/cm2 in 60 fs laser pulse, high-energy deuterons were generated from the Coulomb explosion of deuterated polystyrene solid nanoparticles, and 2.45 MeV neutrons were observed by deuteron-deuteron fusion reaction. The yield of 104-105 neutrons per shot was stably observed during a hundred shots at 0.1-1 Hz operation.抄録全体を表示PDF形式でダウンロード (941K)
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