[Table of Contents]

Plasma and Fusion Research

Volume 8, 2402127 (2013)

Regular Articles

Issues on the Absolute Neutron Emission Measurement at ITER
Mamiko SASAO, Masao ISHIKAWA1), Guoliang YUAN2), Kaushal PATEL3), Shrichand JAKHAR3), Yuri KASHCHUK3) and Luciano BERTALOT3)
Organization for Research Initiatives and Development, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
1)
Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193, Japan
2)
Southwestern Institute of Physics, Chengdu, Sichuan 610041, China
3)
ITER IO, Cadarache Centre, 13108 St Paul-Les-Durance Cedex, France
(Received 10 December 2012 / Accepted 26 February 2013 / Published 26 September 2013)

Abstract

Fusion power output of ITER is measured by a group of neutron flux monitors combined with a neutron activation system and neutron profile monitors. These systems should be absolutely calibrated by use of DD/DT generators moving inside the ITER vacuum vessel (in-situ calibration). Each neutron monitor has a limited measurement range of emission rate, but the ranges are connected by cross-calibration using the ITER plasma with at least one decade overlapping. The over all dynamic range covered by the group of neutron flux monitors is 1014 n/sec to 1021 n/sec. Effects of vertical/radial movement of plasma on the measurement accuracy were reviewed. It was found that cross-calibration using specially planned jog shots, and a vertical neutron camera is important to minimize the inaccuracy caused by the plasma movement.

Keywords

ITER, neutron diagnostics, calibration, dynamic range, fusion output

DOI: 10.1585/pfr.8.2402127

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References

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This paper may be cited as follows:

Mamiko SASAO, Masao ISHIKAWA, Guoliang YUAN, Kaushal PATEL, Shrichand JAKHAR, Yuri KASHCHUK and Luciano BERTALOT, Plasma Fusion Res. 8, 2402127 (2013).