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Study on the Calibration of LHD Neutron Monitoring System

Naoto NISHIO, Atsushi YAMAZAKI, Kenichi WATANABE, Akira URITANI, Mitsutaka ISOBE¹⁾ and Hirokuni YAMANISHI¹⁾

Division of Quantum Science and Energy Engineering, Nagoya University, Nagoya 464-8603, Japan

1)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 5 January 2011 / Accepted 2 June 2011 / Published 26 August 2011)

Abstract

Neutron monitoring is quite important because neutron yield generated by fusion reactions corresponds to the fusion output. In design of the neutron monitor, Monte Carlo simulations play an important role to make corrections on various parameters, such as neutron energy spectrum and spatial distribution when determining the calibration constant. We consider the calibration procedures using a Cf point source toroidally rotating in the vacuum vessel, and evaluate uncertainties of the calibration constant for the neutron detector placed on the center axis.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

neutron monitor, MCNP, calibration, LHD, fusion reactor

DOI: 10.1585/pfr.6.2405115

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References

• [1] A. Iiyoshi, S. Imagawa and LHD Group, Fusion Eng. Des. 46, 323 (1999).
• [2] O. Motojima, K. Akaishi et al., Nucl. Fusion 40, 599 (2000).
• [3] J.F. Briesmeister (Ed.), MCNP – A General Monte Carlo Code for Neutron and Photon Transport Version 3A, (Los Alamos National Laboratory, New Mexico, 1986).
• [4] N. Nishio, S. Yamamoto et al., Rev. Sci. Instrum. 81, 10D306 (2010).

This paper may be cited as follows:

Naoto NISHIO, Atsushi YAMAZAKI, Kenichi WATANABE, Akira URITANI, Mitsutaka ISOBE and Hirokuni YAMANISHI, Plasma Fusion Res. 6, 2405115 (2011).