Plasma and Fusion Research

Volume 16, 2402008 (2021)

Regular Articles

Neutron Emission Rate Characteristics of an Electron Cyclotron Heated Large Helical Device Deuterium Plasma

Kunihiro OGAWA^1,2), Mitsutaka ISOBE^1,2), Ryosuke SEKI^1,2), Hideo NUGA¹⁾, Siriyaporn SANGAROON^1,3), Jungmin JO⁴⁾ and Masaki OSAKABE^1,2)

1): National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2): The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
3): Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand
4): Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea

(Received 27 October 2020 / Accepted 21 December 2020 / Published 10 February 2021)

Abstract

The total neutron emission rate (S_n) characteristics of electron cyclotron heated plasma were surveyed in the Large Helical Device in order to exhibit the thermonuclear performance of helical plasma. The dependence of S_n on electron density showed that S_n increased with an electron density of power of 3.1. To understand S_n, characteristics in the electron cyclotron heated plasma, a numerical simulation considering thermal deuterium-deuterium fusion reactions was performed. Although the numerical simulation overestimated S_n in a relatively low S_n region, calculated S_n matched the experimental result for a relatively high S_n region. A possible reason for the disagreement in the low S_n region is that effective charge due to the impurities such as carbon is changed because of the low density.

Keywords

Large Helical Device, thermal plasma, total neutron emission rate, neutron flux monitor, electron cyclotron heating

DOI: 10.1585/pfr.16.2402008

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