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

研究成果: ジャーナルへの寄稿記事

2 引用 (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.

元の言語英語
記事番号066030
ジャーナルNuclear Fusion
59
発行部数6
DOI
出版物ステータス出版済み - 5 9 2019

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tandem mirrors
inoculation
detachment
nitrogen
hydrogen
gases
impurities
plasma layers
magnetic field configurations
high temperature plasmas
gradients
ions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

これを引用

Ezumi, N., Iijima, T., Sakamoto, M., Nakashima, Y., Hirata, M., Ichimura, M., ... 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.

:: Nuclear Fusion, 巻 59, 番号 6, 066030, 09.05.2019.

研究成果: ジャーナルへの寄稿記事

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, 巻. 59, 番号 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. :: Nuclear Fusion. 2019 ; 巻 59, 番号 6.
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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",
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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.

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