Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror

Y. Nakashima; M.S. Islam; T. Iijima; M. Sakamoto; N. Ezumi; M. Yoshikawa; N. Asakura; M. Fukumoto; A. Hatayama; M. Hirata; M. Ichimura; R. Ikezoe; T. Imai; M.M. Islam; T. Kariya; J. Kohagura; S. Masuzaki; R. Minami; T. Nakano; K. Nojiri; T. Numakura; K. Sawada; M. Shoji; A. Terakado; S. Togo; S. Yamashita; T. Yoshimoto

Nuclear Materials and Energy (Jan 2019)

Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror

Y. Nakashima,
M.S. Islam,
T. Iijima,
M. Sakamoto,
N. Ezumi,
M. Yoshikawa,
N. Asakura,
M. Fukumoto,
A. Hatayama,
M. Hirata,
M. Ichimura,
R. Ikezoe,
T. Imai,
M.M. Islam,
T. Kariya,
J. Kohagura,
S. Masuzaki,
R. Minami,
T. Nakano,
K. Nojiri,
T. Numakura,
K. Sawada,
M. Shoji,
A. Terakado,
S. Togo,
S. Yamashita,
T. Yoshimoto

Affiliations

Y. Nakashima: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan; Corresponding author.
M.S. Islam: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Iijima: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
M. Sakamoto: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
N. Ezumi: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
M. Yoshikawa: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
N. Asakura: National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukoyama, Naka 311-0193, Japan
M. Fukumoto: National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukoyama, Naka 311-0193, Japan
A. Hatayama: Faculty of Science and Technology, Keio University, Kanagawa 220-8522, Japan
M. Hirata: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
M. Ichimura: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
R. Ikezoe: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Imai: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
M.M. Islam: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Kariya: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
J. Kohagura: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
S. Masuzaki: National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
R. Minami: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Nakano: National Institutes for Quantum and Radiological Science and Technology, 801-1, Mukoyama, Naka 311-0193, Japan
K. Nojiri: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Numakura: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
K. Sawada: Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan
M. Shoji: National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
A. Terakado: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
S. Togo: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
S. Yamashita: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan
T. Yoshimoto: Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8577, Japan

Journal volume & issue: Vol. 18
pp. 216 – 221

Abstract

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The transition of a detached to attached plasma experiment has been performed in GAMMA 10/PDX by applying an additional plasma heating pulse of electron cyclotron heating (ECH). In a plasma detachment experiment, a short pulse (25 ms) of ECH was applied at the east plug-cell to examine the effects of electron heating on the plasma parameters in the D-module. It was found that the ion flux increased significantly during ECH injection. In the ECH injection period, the ion flux increased with the increasing impurity injection, which indicates the impurity ion components are enhanced by ionization in the D-module due to the application of ECH. During ECH injection period, the increase of the ion flux near the corner of the target plate shows a clear dependence on the gas species. The 2D visible emission has been captured by the high-speed camera and a bright emission near the corner of the target has been observed. The spectroscopic measurement in the D-module shows that the impurity ion emission increases remarkably during ECH injection. These results indicate the detached plasma change to the attached state. Keywords: GAMMA 10/PDX, Divertor simulation experiment, Plasma detachment, Detached to attached transition

Published in Nuclear Materials and Energy

ISSN: 2352-1791 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-materials-and-energy/

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