[Table of Contents]

Plasma and Fusion Research

Volume 9, 3405141 (2014)

Regular Articles

Study on In-Situ Calibration for Neutron Monitor in the Helical Type Fusion Experimental Device Based on Monte Carlo Calculations
Yuji NAKANO, Atsushi YAMAZAKI, Kenichi WATANABE, Akira URITANI, Kunihiro OGAWA1) and Mitsutaka ISOBE1)
Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 21 November 2013 / Accepted 4 July 2014 / Published 31 October 2014)

Abstract

Monte Carlo simulations in design of neutron monitors for fusion experimental devices play an important role to evaluate the influence of scattering from various structures and to correct differences between neutron energies from calibration source and fusion plasma. We have developed an automated input file generation code based on finely segmented helical coil approximation. In this paper, we study the optimal number of divisions of segmented geometry from viewpoints of simulation precision and required calculation time. We conclude that results with more than 360 divisions saturate into the result with fully fine simulation. And we evaluate influence of neutron scattering from a miniature train, a railroad and supporting structures used in in-situ calibration experiments at LHD.

Keywords

helical type fusion experimental device, neutron monitor, Monte Carlo simulation, in-situ calibration

DOI: 10.1585/pfr.9.3405141

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References

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This paper may be cited as follows:

Yuji NAKANO, Atsushi YAMAZAKI, Kenichi WATANABE, Akira URITANI, Kunihiro OGAWA and Mitsutaka ISOBE, Plasma Fusion Res. 9, 3405141 (2014).