The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 43, Issue 2
Special Issue on Laser Driven Neutron Sources and Applications
Displaying 1-9 of 9 articles from this issue
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Special Issue on Laser Driven Neutron Sources and Applications
Special Issue
Laser Review
  • Preface to Special Issue on Laser Driven Neutron Sources and Applications
    Hiroaki NISHIMURA
    2015 Volume 43 Issue 2 Pages 70-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_70
    JOURNAL FREE ACCESS
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  • Fast Neutron Imaging for Non-Destructive Inspection for Social Infrastructures
    Yoshie OTAKE
    2015 Volume 43 Issue 2 Pages 71-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_71
    JOURNAL FREE ACCESS
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    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.
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  • New Applications of Laser-Driven Neutron Sources in the Car Industry
    Mitsutaka KAKENO
    2015 Volume 43 Issue 2 Pages 77-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_77
    JOURNAL FREE ACCESS
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    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.
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  • Laser-Energy Scaling Law for Neutrons Generated from Nano Particles Coulomb-Exploded by Intense Femtosecond Laser Pulses
    Shuji SAKABE, Masaki HASHIDA
    2015 Volume 43 Issue 2 Pages 82-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_82
    JOURNAL FREE ACCESS
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    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.
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  • Fusion Neutron Generation by High-Repetitive Target Injection
    Yoneyoshi KITAGAWA
    2015 Volume 43 Issue 2 Pages 88-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_88
    JOURNAL FREE ACCESS
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    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.
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  • Neutron Generation by Laser-Driven Proton Sources
    Markus ROTH
    2015 Volume 43 Issue 2 Pages 93-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_93
    JOURNAL FREE ACCESS
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    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.
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  • Neutron Generation by Laser-Driven Photonuclear Reaction
    NAKAI Mitsuo , Yasunobu ARIKAWA, Masaru UTSUGI, Hiroaki NISHIMURA, N ...
    2015 Volume 43 Issue 2 Pages 98-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_98
    JOURNAL FREE ACCESS
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    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.
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  • The Neutron Diagnostics Technique for Laser Fusion Using Ultra Intense Laser
    Yasunobu ARIKAWA, Takahiro NAGAI, Yuki ABE, Masaru UTSUGI, Kohei YA ...
    2015 Volume 43 Issue 2 Pages 103-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.2_103
    JOURNAL FREE ACCESS
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    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.
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