Plasma and Fusion Research

Volume 17, 2402023 (2022)

Regular Articles

Estimation of the Tritium Yields in Deuterium Fusion Plasmas Considering the Fast-Ion Velocity Distribution Function

Hideo NUGA¹⁾, Ryosuke SEKI^1,2), Kunihiro OGAWA^1,2), Shuji KAMIO¹⁾, Yutaka FUJIWARA³⁾, Hiroyuki YAMAGUCHI^1,2), Masaki OSAKABE^1,2), Mitsutaka ISOBE^1,2) and Masayuki YOKOYAMA^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): NTT Space Environment and Energy Laboratories, Tokyo 180-8585, Japan

(Received 19 December 2021 / Accepted 12 February 2022 / Published 22 April 2022)

Abstract

Tritium yields due to the deuterium-deuterium fusion reaction during the 22nd LHD experiment campaign are numerically estimated. As usual, the total tritium yields are assumed to be the same total neutron yields. In the Large Helical Device (LHD), however, it is considered that fusion reactivity of the D(d,p)T branch is lower than that of the D(d,n)³He one because the fusion reaction between a fast-deuteron and a thermal deuteron is dominant. By integrated simulation, considering the velocity distribution function of fast-deuteron, the ratio of the tritium yields to the neutron yields is estimated to be Y_t/Y_n ∼ 0.936. From the assumptions applied in the simulation, it is expected that this value should be still an over-estimation rather than the actual value.

Keywords

LHD, deuterium experiment, neutron measurement, integrated simulation, tritium inventory

DOI: 10.1585/pfr.17.2402023

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