Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX

M. D.Shahinul Islam; Yousuke Nakashima; Takaaki Iijima; Kunpei Nojiri; Naomichi Ezumi; Masayuki Yoshikawa; Tsuyoshi Kariya; Ryutaro Minami; Mafumi Hirata; Kazuo Hoshino; Akiyoshi Hatayama; Hiroki Hasegawa; Seiji Ishiguro; Hiroto Matsuura; Mizuki Sakamoto

doi:10.1585/pfr.15.1402074

Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX

M. D.Shahinul Islam, Yousuke Nakashima, Takaaki Iijima, Kunpei Nojiri, Naomichi Ezumi, Masayuki Yoshikawa, Tsuyoshi Kariya, Ryutaro Minami, Mafumi Hirata, Kazuo Hoshino, Akiyoshi Hatayama, Hiroki Hasegawa, Seiji Ishiguro, Hiroto Matsuura, Mizuki Sakamoto

Power Exhaust and Particle Control

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Abstract

The transition phenomenon of detached plasma during additional heating effects has been studied by applying a short pulse (25ms) of Electron Cyclotron Heating (ECH) at the east plug-cell of the tandem mirror device GAMMA 10/PDX. In this paper, the plasma parameters on the target plate of the D-module are studied for understanding the impact of transient heating pulse on the sustainability of the detached plasma. The heat flux increases on the target plate for the additional heating case in comparison to without heating pulse. The ion flux also increases when the ECH heating is activated. The electron density enhances significantly during the ECH heating pulse application period. Furthermore, the electron density and the ion flux increase according to the increment of Xe plenum pressure in the case of ECH heating condition. The experimental results clarified that ECH heating pulse can drive the detachment state to attached state in spite of strong effect of Xe gas for generating the detached plasma.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Plasma and Fusion Research
Volume	15
DOIs	https://doi.org/10.1585/pfr.15.1402074
State	Published - 2020

Funding

This study was supported by the bidirectional collaboration research program of the University of Tsukuba, and National Institute for Fusion Science (NIFS19KUGM140). The authors would like to thank the members of the GAMMA 10 group for their support during the experiment.

Keywords

D-module
Detached to attached transition
Electron density
Gamma 10/pdx
Heat flux
Ion flux

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10.1585/pfr.15.1402074

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Islam, M. D. S., Nakashima, Y., Iijima, T., Nojiri, K., Ezumi, N., Yoshikawa, M., Kariya, T., Minami, R., Hirata, M., Hoshino, K., Hatayama, A., Hasegawa, H., Ishiguro, S., Matsuura, H., & Sakamoto, M. (2020). Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX. Plasma and Fusion Research, 15, 1-8. https://doi.org/10.1585/pfr.15.1402074

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title = "Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX",

abstract = "The transition phenomenon of detached plasma during additional heating effects has been studied by applying a short pulse (25ms) of Electron Cyclotron Heating (ECH) at the east plug-cell of the tandem mirror device GAMMA 10/PDX. In this paper, the plasma parameters on the target plate of the D-module are studied for understanding the impact of transient heating pulse on the sustainability of the detached plasma. The heat flux increases on the target plate for the additional heating case in comparison to without heating pulse. The ion flux also increases when the ECH heating is activated. The electron density enhances significantly during the ECH heating pulse application period. Furthermore, the electron density and the ion flux increase according to the increment of Xe plenum pressure in the case of ECH heating condition. The experimental results clarified that ECH heating pulse can drive the detachment state to attached state in spite of strong effect of Xe gas for generating the detached plasma.",

keywords = "D-module, Detached to attached transition, Electron density, Gamma 10/pdx, Heat flux, Ion flux",

author = "Islam, {M. D.Shahinul} and Yousuke Nakashima and Takaaki Iijima and Kunpei Nojiri and Naomichi Ezumi and Masayuki Yoshikawa and Tsuyoshi Kariya and Ryutaro Minami and Mafumi Hirata and Kazuo Hoshino and Akiyoshi Hatayama and Hiroki Hasegawa and Seiji Ishiguro and Hiroto Matsuura and Mizuki Sakamoto",

note = "Publisher Copyright: {\textcopyright} 2020 The Japan Society of Plasma Science and Nuclear Fusion Research",

year = "2020",

doi = "10.1585/pfr.15.1402074",

language = "English",

volume = "15",

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journal = "Plasma and Fusion Research",

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Islam, MDS, Nakashima, Y, Iijima, T, Nojiri, K, Ezumi, N, Yoshikawa, M, Kariya, T, Minami, R, Hirata, M, Hoshino, K, Hatayama, A, Hasegawa, H, Ishiguro, S, Matsuura, H & Sakamoto, M 2020, 'Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX', Plasma and Fusion Research, vol. 15, pp. 1-8. https://doi.org/10.1585/pfr.15.1402074

TY - JOUR

T1 - Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX

AU - Islam, M. D.Shahinul

AU - Nakashima, Yousuke

AU - Iijima, Takaaki

AU - Nojiri, Kunpei

AU - Ezumi, Naomichi

AU - Yoshikawa, Masayuki

AU - Kariya, Tsuyoshi

AU - Minami, Ryutaro

AU - Hirata, Mafumi

AU - Hoshino, Kazuo

AU - Hatayama, Akiyoshi

AU - Hasegawa, Hiroki

AU - Ishiguro, Seiji

AU - Matsuura, Hiroto

AU - Sakamoto, Mizuki

PY - 2020

Y1 - 2020

N2 - The transition phenomenon of detached plasma during additional heating effects has been studied by applying a short pulse (25ms) of Electron Cyclotron Heating (ECH) at the east plug-cell of the tandem mirror device GAMMA 10/PDX. In this paper, the plasma parameters on the target plate of the D-module are studied for understanding the impact of transient heating pulse on the sustainability of the detached plasma. The heat flux increases on the target plate for the additional heating case in comparison to without heating pulse. The ion flux also increases when the ECH heating is activated. The electron density enhances significantly during the ECH heating pulse application period. Furthermore, the electron density and the ion flux increase according to the increment of Xe plenum pressure in the case of ECH heating condition. The experimental results clarified that ECH heating pulse can drive the detachment state to attached state in spite of strong effect of Xe gas for generating the detached plasma.

AB - The transition phenomenon of detached plasma during additional heating effects has been studied by applying a short pulse (25ms) of Electron Cyclotron Heating (ECH) at the east plug-cell of the tandem mirror device GAMMA 10/PDX. In this paper, the plasma parameters on the target plate of the D-module are studied for understanding the impact of transient heating pulse on the sustainability of the detached plasma. The heat flux increases on the target plate for the additional heating case in comparison to without heating pulse. The ion flux also increases when the ECH heating is activated. The electron density enhances significantly during the ECH heating pulse application period. Furthermore, the electron density and the ion flux increase according to the increment of Xe plenum pressure in the case of ECH heating condition. The experimental results clarified that ECH heating pulse can drive the detachment state to attached state in spite of strong effect of Xe gas for generating the detached plasma.

KW - D-module

KW - Detached to attached transition

KW - Electron density

KW - Gamma 10/pdx

KW - Heat flux

KW - Ion flux

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DO - 10.1585/pfr.15.1402074

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SN - 1880-6821

VL - 15

SP - 1

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JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

ER -

Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX

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Keywords

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