Plasma and Fusion Research

Volume 13, 3402032 (2018)

Regular Articles

Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments
Takayuki YOKODO, Yousuke NAKASHIMA, Akiyoshi HATAYAMA1), Takaaki IIJIMA, Md. Shahinul ISLAM, Tsubasa YOSHIMOTO, Kazuya ICHIMURA2), Md. Maidul ISLAM, Guanyi LEE, Sotaro YAMASHITA, Akihiro TERAKADO, Kunpei NOJIRI, Masayuki YOSHIKAWA, Junko KOHAGURA, Naomichi EZUMI, Mizuki SAKAMOTO and Tsuyoshi IMAI
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
1)
Graduate School of Science and Technology, Keio University, Yokohama 223-8522, Japan
2)
Graduate School of Engineering, Kobe University, Kobe 657-0013, Japan
(Received 4 January 2018 / Accepted 19 March 2018 / Published 22 May 2018)

Abstract

Detailed results of spectral measurements in the gas injection performed in GAMMA 10/PDX divertor simulation experiments are presented. From the comparison of the emission intensity at the end-cell and plug/barrier-cell, impurity behavior along the magnetic field line is discussed in GAMMA 10/PDX. The emission intensity of Ar II is decreased due to the increase in the background plasma density and the end loss particle flux, which consequently suppresses the Ar particle transport towards the upstream region. The ECH in the plug-cell (EP-ECH) was applied to investigate the influence of the heating on the emission of injected impurities. Ar II intensity slightly increased EP-ECH. On the other hand, Kr II and Xe II decreased at the plug/barrier-cell.

Keywords

GAMMA 10/PDX, divertor, spectroscopic measurement, noble gas, impurity transport

DOI: 10.1585/pfr.13.3402032

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