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

doi:10.1016/j.nme.2018.12.033

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. NojiriT. Numakura, K. Sawada, M. Shoji, A. Terakado, S. Togo, S. Yamashita, T. Yoshimoto

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Abstract

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.

Original language	English
Pages (from-to)	216-221
Number of pages	6
Journal	Nuclear Materials and Energy
Volume	18
DOIs	https://doi.org/10.1016/j.nme.2018.12.033
State	Published - Jan 2019
Externally published	Yes

Keywords

Detached to attached transition
Divertor simulation experiment
GAMMA 10/PDX
Plasma detachment

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10.1016/j.nme.2018.12.033

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Nakashima, Y., Islam, M. S., Iijima, T., Sakamoto, M., Ezumi, N., Yoshikawa, M., Asakura, N., Fukumoto, M., Hatayama, A., Hirata, M., Ichimura, M., Ikezoe, R., Imai, T., Islam, M. M., Kariya, T., Kohagura, J., Masuzaki, S., Minami, R., Nakano, T., ... Yoshimoto, T. (2019). Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror. Nuclear Materials and Energy, 18, 216-221. https://doi.org/10.1016/j.nme.2018.12.033

@article{ad505032184e47e88ff363dedff7f686,

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

abstract = "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 = "Detached to attached transition, Divertor simulation experiment, GAMMA 10/PDX, Plasma detachment",

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

note = "Publisher Copyright: {\textcopyright} 2019 The Authors",

year = "2019",

month = jan,

doi = "10.1016/j.nme.2018.12.033",

language = "English",

volume = "18",

pages = "216--221",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

Nakashima, Y, Islam, MS, Iijima, T, Sakamoto, M, Ezumi, N, Yoshikawa, M, Asakura, N, Fukumoto, M, Hatayama, A, Hirata, M, Ichimura, M, Ikezoe, R, Imai, T, Islam, MM, Kariya, T, Kohagura, J, Masuzaki, S, Minami, R, Nakano, T, Nojiri, K, Numakura, T, Sawada, K, Shoji, M, Terakado, A, Togo, S, Yamashita, S & Yoshimoto, T 2019, 'Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror', Nuclear Materials and Energy, vol. 18, pp. 216-221. https://doi.org/10.1016/j.nme.2018.12.033

TY - JOUR

T1 - Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror

AU - Nakashima, Y.

AU - Islam, M. S.

AU - Iijima, T.

AU - Sakamoto, M.

AU - Ezumi, N.

AU - Yoshikawa, M.

AU - Asakura, N.

AU - Fukumoto, M.

AU - Hatayama, A.

AU - Hirata, M.

AU - Ichimura, M.

AU - Ikezoe, R.

AU - Imai, T.

AU - Islam, M. M.

AU - Kariya, T.

AU - Kohagura, J.

AU - Masuzaki, S.

AU - Minami, R.

AU - Nakano, T.

AU - Nojiri, K.

AU - Numakura, T.

AU - Sawada, K.

AU - Shoji, M.

AU - Terakado, A.

AU - Togo, S.

AU - Yamashita, S.

AU - Yoshimoto, T.

PY - 2019/1

Y1 - 2019/1

N2 - 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.

AB - 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.

KW - Detached to attached transition

KW - Divertor simulation experiment

KW - GAMMA 10/PDX

KW - Plasma detachment

UR - http://www.scopus.com/inward/record.url?scp=85059444173&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2018.12.033

DO - 10.1016/j.nme.2018.12.033

M3 - Article

AN - SCOPUS:85059444173

SN - 2352-1791

VL - 18

SP - 216

EP - 221

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

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

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Keywords

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