Plasma and Fusion Research

Volume 16, 1402039 (2021)

Regular Articles

Characterization of the New Vertical Neutron Camera Designed for the Low Neutron Emission Rate Plasma in Large Helical Device

Siriyaporn SANGAROON^1,2), Kunihiro OGAWA^1,3), Mitsutaka ISOBE^1,3), Yutaka FUJIWARA¹⁾, Hiroyuki YAMAGUCHI¹⁾, Shuji KAMIO¹⁾, Ryosuke SEKI^1,3), Hideo NUGA¹⁾, Makoto I. KOBAYASHI^1,3) and Masaki OSAKABE^1,3)

1): National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2): Department of Physics, Faculty of Science, Mahasarakham University, Maha Sarakham, Thailand
3): The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan

(Received 22 December 2020 / Accepted 3 February 2021 / Published 12 March 2021)

Abstract

Characteristics of the new vertical neutron camera (VNC3) installed for the study of energetic-particle transport in the relatively low neutron emission rate (S_n) in Large Helical Device (LHD) deuterium plasma is investigated. Dependence of signal of VNC3 operating with the current mode on S_n shows that accurate neutron signal is obtained using VNC3 in low S_n range with 10 ms time bin where the error of neutron counts of first vertical neutron camera (VNC1) operating with the pulse counting mode is significantly large. Time-resolved measurements of neutron emission profiles in deuterium beam heated low S_n plasmas are performed. Although the line-integrated neutron obtained by VNC3 is wider due to its larger inner diameter of the collimator compared to VNC1, the neutron profile measured by VNC3 is almost matched with the neutron profile measured by VNC1. The time-resolved neutron profile measurement in low S_n discharge with relatively short time period becomes possible using VNC3.

Keywords

LHD, vertical neutron camera, neutron emission profile, energetic particle

DOI: 10.1585/pfr.16.1402039

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