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Investigation of E-Divertor Plasma during Simultaneous Injection of Hydrogen and Impurity Gases into GAMMA 10/PDX by Using the LINDA Code

Md. Shahinul ISLAM, Yousuke NAKASHIMA, Akiyoshi HATAYAMA¹⁾, Kazuya ICHIMURA²⁾, Takaaki IIJIMA, Md. Maidul ISLAM, Takayuki YOKODO, Guanyi LEE, Tsubasa YOSHIMOTO, Sotaro YAMASHITA, Naomichi EZUMI and Mizuki SAKAMOTO

Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

1)

Graduate School of Science and Technology, Keio University, Hiyoshi, Yokohama 223-8522, Japan

2)

Graduate School of Engineering, Kobe University, Kobe, Hyogo 657-8501, Japan

(Received 26 December 2017 / Accepted 21 May 2018 / Published 25 June 2018)

Abstract

This paper describes the behavior of plasma parameters in the E-divertor region of GAMMA 10/PDX numerically by using the multi-fluid code (LINDA) during injection of hydrogen (H) and Argon (Ar). A remarkable reduction in the electron temperature (T_e) has been recognized due to Ar injection. For only Ar 6.0 × 10¹⁷ m⁻³ injection, T_e on the target plate decreases to nearly 10 eV. T_e also reduces according to the increment of H injection. The ion temperature (T_i) on the target plate also decreases according to the increment of injected H neutral density. A tendency of saturation in the particle flux and the electron density is observed at the higher H injection in the case of simultaneous injection of H and Ar. The charge exchange loss enhances significantly during H injection. The radiation power loss also enhances for Ar injection.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

GAMMA 10/PDX, E-Divertor, LINDA code, Ar injection, hydrogen injection, plasma detachment

DOI: 10.1585/pfr.13.3403080

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