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Kim, M.; Malins, A.; Machida, Masahiko; Yoshimura, Kazuya; Saito, Kimiaki; Yoshida, Hiroko*; Yanagi, Hideaki*; Yoshida, Toru*; Hasegawa, Yukihiro*
RIST News, (67), p.3 - 15, 2021/09
no abstracts in English
Sato, Tatsuhiko; Niita, Koji*; Matsuda, Norihiro; Hashimoto, Shintaro; Iwamoto, Yosuke; Furuta, Takuya; Noda, Shusaku; Ogawa, Tatsuhiko; Iwase, Hiroshi*; Nakashima, Hiroshi; et al.
Annals of Nuclear Energy, 82, p.110 - 115, 2015/08
Times Cited Count：34 Percentile：93.49(Nuclear Science & Technology)The general purpose Monte Carlo Particle and Heavy Ion Transport code System, PHITS, is being developed through a collaboration of several institutes in Japan and Europe. The Japan Atomic Energy Agency is responsible for managing the entire project. PHITS can deal with the transport of nearly all particles, including neutrons, protons, heavy ions, photons, and electrons, over wide energy ranges using various nuclear reaction models and data libraries. This paper briefly summarizes the physics models implemented in PHITS, and introduces some important functions useful for particular purposes, such as an event generator mode and beam transport functions.
Matsuoka, Seikichi*; Satake, Shinsuke*; Idomura, Yasuhiro; Imamura, Toshiyuki*
Proceedings of Joint International Conference on Mathematics and Computation, Supercomputing in Nuclear Applications and the Monte Carlo Method (M&C + SNA + MC 2015) (CD-ROM), 13 Pages, 2015/04
The quality and performance of a parallel pseudo-random number generator (PRNG), KMATH_RANDOM, are investigated using a Monte Carlo particle simulation code for the plasma transport. The library is based on Mersenne Twister with jump routines and provides a numerical tool which is suitable and easy-to-use on massively parallel supercomputers such as K-computer. The library enables the particle code to increase the parallelization up to several thousand processes without loosing the quality and performance of the PRNG. As a result, the particle code can use large amounts of random numbers, which results in removing unphysical phenomena caused by a numerical noise.
Sukegawa, Atsuhiko; Niita, Koji*
JAEA-Data/Code 2014-013, 61 Pages, 2014/08
JAEA-Data-Code-2014-013.pdf:34.06MB
The accuracy and efficiency of the PHITS code has been investigated towards the application to the fusion facilities by making comparison between PHITS and MCNP calculation for a simplified cylindrical model, for a 3D detailed model of tokamak fusion device, and for experimental assembly models of accelerator for fusion facilities. It was clarified that the results of neutron and photon spectrum obtained by the PHITS code agree with those of MCNP within statistical errors as far as they use the same cross section library, the same model and the same neutron source for the calculation. Moreover, the results of both codes are consistent each other within statistical errors for the case with the same weight window method as a variance reduction technique.
Sato, Tatsuhiko; Niita, Koji*; Matsuda, Norihiro; Hashimoto, Shintaro; Iwamoto, Yosuke; Noda, Shusaku; Ogawa, Tatsuhiko; Iwase, Hiroshi*; Nakashima, Hiroshi; Fukahori, Tokio; et al.
Journal of Nuclear Science and Technology, 50(9), p.913 - 923, 2013/09
Times Cited Count：561 Percentile：99.98(Nuclear Science & Technology)An upgraded version of the Particle and Heavy Ion Transport code System, PHITS 2.52, was developed and released to public. The new version has been greatly improved from the previous released version, PHITS 2.24, in terms of not only the code itself but also the contents of its package such as attached data libraries. Owing to these improvements, PHITS became a more powerful tool for particle transport simulation applicable to various research and development fields such as nuclear technology, accelerator design, medical physics, and cosmic-ray research.
Sato, Tatsuhiko; Niita, Koji*; Matsuda, Norihiro; Hashimoto, Shintaro; Iwamoto, Yosuke; Noda, Shusaku; Ogawa, Tatsuhiko; Nakashima, Hiroshi; Fukahori, Tokio; Okumura, Keisuke; et al.
RIST News, (54), p.14 - 24, 2013/01
Features of the latest version of the PHITS code (version 2.52) is described.
Niita, Koji*; Matsuda, Norihiro; Iwamoto, Yosuke; Iwase, Hiroshi*; Sato, Tatsuhiko; Nakashima, Hiroshi; Sakamoto, Yukio; Sihver, L.*
JAEA-Data/Code 2010-022, 189 Pages, 2010/10
JAEA-Data-Code-2010-022.pdf:1.89MB
The Particle and Heavy-Ion Transport code System PHITS has been developed under the collaboration of JAEA, RIST and KEK, as an upgraded version of the NMTC/JAM code developed. PHITS can deal with the transport of all particles and heavy ions over wide energy ranges, using several nuclear reaction models and nuclear data libraries. The geometrical configuration of the simulation can be setup by GG (General Geometry) or CG (Combinatorial Geometry). Various quantities such as heat, track length and production yields can be deduced from the simulation, using implemented estimator functions called "tally". The code also has a function to draw 2D figures of the calculated results as well as the setup geometries, using ANGEL. Owing to these features, PHITS has been widely used for various purposes such as designs of accelerator shielding, radiation therapy and space exploration. This document provides the manual of PHITS.
O
-yttria stabilized ZrO composite material irradiated with Ne
ions at high temperaturesHojo, Tomohiro*; Yamamoto, Hiroyuki; Aihara, Jun; Furuno, Shigemi*; Sawa, Kazuhiro; Sakuma, Takashi*; Hojo, Kiichi
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.123 - 127, 2006/09
Times Cited Count：2 Percentile：21.09(Instruments & Instrumentation)Spinel and yttria stabilized zirconia (YSZ) are candidates for fuel materials for use in nuclear reactors and the optical and insulating materials for fusion reactors. In the present study, the damage evolution process of polycrystalline spinel-YSZ composite materials has been studied by in situ transmission electron microscope observation during ion irradiation. The irradiation was performed with 30 keV Ne at a flux of 5 
10
ions/cm
per second at 923 K and 1473 K, respectively. At 923 K, defect clusters and bubbles were formed homogeneously in YSZ grains. On the other hand, at 1473 K, only bubble formation was observed. The bubbles grew remarkably with increasing ion fluence in both grains. Even though the growth of the bubbles was observed in both grains, the average diameter of grown bubbles in spinel grains was larger than those in YSZ ones. The bubbles tended to form along the grain boundary at both temperatures.
Hojo, Tomohiro*; Yamamoto, Hiroyuki; Aihara, Jun; Furuno, Shigemi*; Sawa, Kazuhiro; Sakuma, Takashi*; Hojo, Kiichi
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.101 - 105, 2006/09
Times Cited Count：6 Percentile：43.85(Instruments & Instrumentation)Yttria stabilized zirconia (YSZ) is a candidate material focused as optical and insulating materials in nuclear reactors. Therefore, it is useful to investigate defect formation during irradiation, in order to assess YSZ resistance to radiation damage. In the present study, in situ transmission electron microscopy (TEM) observations were performed on YSZ during 30 keV Ne irradiation in the temperature range of 723-1123 K. For irradiations below 1023 K, defect clusters and bubbles were formed simultaneously. On the other hand, at 1123 K, only bubbles were formed in the initial stage of irradiation. Loops formed later following the bubble formation. It was also observed that, in the early stage of irradiation above 923 K, larger bubbles were formed along the loop planes compared with other areas. TEM observations indicated that dislocation loops formed on three kinds of crystallographic planes: namely, (100), (111) and (112) planes.
