Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror

N. Ezumi; T. Iijima; M. Sakamoto; Y. Nakashima; M. Hirata; M. Ichimura; R. Ikezoe; T. Imai; T. Kariya; I. Katanuma; J. Kohagura; R. Minami; T. Numakura; M. Yoshikawa; S. Togo; M. S. Islam; M. M. Islam; K. Nojiri; A. Terakado; S. Jang; Y. Kinoshita; T. Mikami; S. Yamashita; T. Yoshimoto; T. Hara; A. Hatayama; K. Ichimura; S. Kado; S. Masuzaki; T. Nakano; N. Ohno; S. Sawada; H. Tanaka; A. Tonegawa; R. Perillo

doi:10.1088/1741-4326/ab1a4a

Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror

N. Ezumi, T. Iijima, M. Sakamoto, Y. Nakashima, M. Hirata, M. Ichimura, R. Ikezoe, T. Imai, T. Kariya, I. Katanuma, J. Kohagura, R. Minami, T. Numakura, M. Yoshikawa, S. Togo, M. S. Islam, M. M. Islam, K. Nojiri, A. Terakado, S. JangY. Kinoshita, T. Mikami, S. Yamashita, T. Yoshimoto, T. Hara, A. Hatayama, K. Ichimura, S. Kado, S. Masuzaki, T. Nakano, N. Ohno, S. Sawada, H. Tanaka, A. Tonegawa, R. Perillo

附属高温プラズマ理工学研究センター

研究成果: Contribution to journal › Article › 査読

4 被引用数 (Scopus)

抄録

We have investigated the synergistic effect of a combination of various impurity gases and hydrogen gas on plasma detachment of high temperature plasma, equivalent to scrape-off layer plasma of tokamaks in the GAMMA 10/PDX end region, utilizing an open magnetic field configuration. A small puff of an impurity gas (N₂, Ne, Ar, Kr, Xe) in combination with a puff of H₂ gas is examined to evaluate their synergistic effect on the formation of detached plasma; the following results are obtained. (i) A combination of N₂ and H₂ puffs showed a clear decrease of electron density and ion flux; (ii) N₂ and H₂ puffs form a strong density gradient along the axial direction; and (iii) other noble impurity gases showed an insufficient synergistic effect. The new results indicate the possibility of achieving a reliable divertor operation scheme and the importance of a deeper understanding of the H₂ and N₂ assisted recombination process.

本文言語	英語
論文番号	066030
ジャーナル	Nuclear Fusion
巻	59
号	6
DOI	https://doi.org/10.1088/1741-4326/ab1a4a
出版ステータス	出版済み - 5 9 2019

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

文献へのアクセス

10.1088/1741-4326/ab1a4a

フィンガープリント「Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル

Ezumi, N., Iijima, T., Sakamoto, M., Nakashima, Y., Hirata, M., Ichimura, M., Ikezoe, R., Imai, T., Kariya, T., Katanuma, I., Kohagura, J., Minami, R., Numakura, T., Yoshikawa, M., Togo, S., Islam, M. S., Islam, M. M., Nojiri, K., Terakado, A., ... Perillo, R. (2019). Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror. Nuclear Fusion, 59(6), [066030]. https://doi.org/10.1088/1741-4326/ab1a4a

Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror. / Ezumi, N.; Iijima, T.; Sakamoto, M.; Nakashima, Y.; Hirata, M.; Ichimura, M.; Ikezoe, R.; Imai, T.; Kariya, T.; Katanuma, I.; Kohagura, J.; Minami, R.; Numakura, T.; Yoshikawa, M.; Togo, S.; Islam, M. S.; Islam, M. M.; Nojiri, K.; Terakado, A.; Jang, S.; Kinoshita, Y.; Mikami, T.; Yamashita, S.; Yoshimoto, T.; Hara, T.; Hatayama, A.; Ichimura, K.; Kado, S.; Masuzaki, S.; Nakano, T.; Ohno, N.; Sawada, S.; Tanaka, H.; Tonegawa, A.; Perillo, R.

In: Nuclear Fusion, Vol. 59, No. 6, 066030, 09.05.2019.

研究成果: Contribution to journal › Article › 査読

Ezumi, N, Iijima, T, Sakamoto, M, Nakashima, Y, Hirata, M, Ichimura, M, Ikezoe, R, Imai, T, Kariya, T, Katanuma, I, Kohagura, J, Minami, R, Numakura, T, Yoshikawa, M, Togo, S, Islam, MS, Islam, MM, Nojiri, K, Terakado, A, Jang, S, Kinoshita, Y, Mikami, T, Yamashita, S, Yoshimoto, T, Hara, T, Hatayama, A, Ichimura, K, Kado, S, Masuzaki, S, Nakano, T, Ohno, N, Sawada, S, Tanaka, H, Tonegawa, A & Perillo, R 2019, 'Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror', Nuclear Fusion, vol. 59, no. 6, 066030. https://doi.org/10.1088/1741-4326/ab1a4a

Ezumi, N. ; Iijima, T. ; Sakamoto, M. ; Nakashima, Y. ; Hirata, M. ; Ichimura, M. ; Ikezoe, R. ; Imai, T. ; Kariya, T. ; Katanuma, I. ; Kohagura, J. ; Minami, R. ; Numakura, T. ; Yoshikawa, M. ; Togo, S. ; Islam, M. S. ; Islam, M. M. ; Nojiri, K. ; Terakado, A. ; Jang, S. ; Kinoshita, Y. ; Mikami, T. ; Yamashita, S. ; Yoshimoto, T. ; Hara, T. ; Hatayama, A. ; Ichimura, K. ; Kado, S. ; Masuzaki, S. ; Nakano, T. ; Ohno, N. ; Sawada, S. ; Tanaka, H. ; Tonegawa, A. ; Perillo, R. / Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror. In: Nuclear Fusion. 2019 ; Vol. 59, No. 6.

@article{1829ff9745214c228ad3ff9bf3fb9015,

title = "Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror",

abstract = "We have investigated the synergistic effect of a combination of various impurity gases and hydrogen gas on plasma detachment of high temperature plasma, equivalent to scrape-off layer plasma of tokamaks in the GAMMA 10/PDX end region, utilizing an open magnetic field configuration. A small puff of an impurity gas (N2, Ne, Ar, Kr, Xe) in combination with a puff of H2 gas is examined to evaluate their synergistic effect on the formation of detached plasma; the following results are obtained. (i) A combination of N2 and H2 puffs showed a clear decrease of electron density and ion flux; (ii) N2 and H2 puffs form a strong density gradient along the axial direction; and (iii) other noble impurity gases showed an insufficient synergistic effect. The new results indicate the possibility of achieving a reliable divertor operation scheme and the importance of a deeper understanding of the H2 and N2 assisted recombination process.",

author = "N. Ezumi and T. Iijima and M. Sakamoto and Y. Nakashima and M. Hirata and M. Ichimura and R. Ikezoe and T. Imai and T. Kariya and I. Katanuma and J. Kohagura and R. Minami and T. Numakura and M. Yoshikawa and S. Togo and Islam, {M. S.} and Islam, {M. M.} and K. Nojiri and A. Terakado and S. Jang and Y. Kinoshita and T. Mikami and S. Yamashita and T. Yoshimoto and T. Hara and A. Hatayama and K. Ichimura and S. Kado and S. Masuzaki and T. Nakano and N. Ohno and S. Sawada and H. Tanaka and A. Tonegawa and R. Perillo",

year = "2019",

month = may,

day = "9",

doi = "10.1088/1741-4326/ab1a4a",

language = "English",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "6",

}

TY - JOUR

T1 - Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror

AU - Ezumi, N.

AU - Iijima, T.

AU - Sakamoto, M.

AU - Nakashima, Y.

AU - Hirata, M.

AU - Ichimura, M.

AU - Ikezoe, R.

AU - Imai, T.

AU - Kariya, T.

AU - Katanuma, I.

AU - Kohagura, J.

AU - Minami, R.

AU - Numakura, T.

AU - Yoshikawa, M.

AU - Togo, S.

AU - Islam, M. S.

AU - Islam, M. M.

AU - Nojiri, K.

AU - Terakado, A.

AU - Jang, S.

AU - Kinoshita, Y.

AU - Mikami, T.

AU - Yamashita, S.

AU - Yoshimoto, T.

AU - Hara, T.

AU - Hatayama, A.

AU - Ichimura, K.

AU - Kado, S.

AU - Masuzaki, S.

AU - Nakano, T.

AU - Ohno, N.

AU - Sawada, S.

AU - Tanaka, H.

AU - Tonegawa, A.

AU - Perillo, R.

PY - 2019/5/9

Y1 - 2019/5/9

N2 - We have investigated the synergistic effect of a combination of various impurity gases and hydrogen gas on plasma detachment of high temperature plasma, equivalent to scrape-off layer plasma of tokamaks in the GAMMA 10/PDX end region, utilizing an open magnetic field configuration. A small puff of an impurity gas (N2, Ne, Ar, Kr, Xe) in combination with a puff of H2 gas is examined to evaluate their synergistic effect on the formation of detached plasma; the following results are obtained. (i) A combination of N2 and H2 puffs showed a clear decrease of electron density and ion flux; (ii) N2 and H2 puffs form a strong density gradient along the axial direction; and (iii) other noble impurity gases showed an insufficient synergistic effect. The new results indicate the possibility of achieving a reliable divertor operation scheme and the importance of a deeper understanding of the H2 and N2 assisted recombination process.

AB - We have investigated the synergistic effect of a combination of various impurity gases and hydrogen gas on plasma detachment of high temperature plasma, equivalent to scrape-off layer plasma of tokamaks in the GAMMA 10/PDX end region, utilizing an open magnetic field configuration. A small puff of an impurity gas (N2, Ne, Ar, Kr, Xe) in combination with a puff of H2 gas is examined to evaluate their synergistic effect on the formation of detached plasma; the following results are obtained. (i) A combination of N2 and H2 puffs showed a clear decrease of electron density and ion flux; (ii) N2 and H2 puffs form a strong density gradient along the axial direction; and (iii) other noble impurity gases showed an insufficient synergistic effect. The new results indicate the possibility of achieving a reliable divertor operation scheme and the importance of a deeper understanding of the H2 and N2 assisted recombination process.

UR - http://www.scopus.com/inward/record.url?scp=85067543975&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067543975&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ab1a4a

DO - 10.1088/1741-4326/ab1a4a

M3 - Article

AN - SCOPUS:85067543975

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 6

M1 - 066030

ER -