Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror

Y. Nakashima, K. Ichimura, M. S. Islam, M. Sakamoto, N. Ezumi, M. Hirata, M. Ichimura, R. Ikezoe, T. Imai, T. Kariya, I. Katanuma, J. Kohagura, R. Minami, T. Numakura, M. Yoshikawa, T. Iijima, M. M. Islam, K. Nojiri, K. Shimizu, A. TerakadoS. Togo, N. Asakura, M. Fukumoto, Akiyoshi Hatayama, Y. Hirooka, S. Kado, H. Kubo, S. Masuzaki, H. Matsuura, T. Nakano, S. Nagata, N. Nishino, N. Ohno, A. Sagara, K. Sawada, M. Shoji, A. Tonegawa, Y. Ueda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

This paper describes the recent progress in divertor simulation research using the GAMMA 10/PDX tandem mirror towards the development of divertors in fusion reactors. During a plasma flow generation experiment in the end cell of the GAMMA 10/PDX, ICRF heating in the anchor cell successfully extended the particle flux up to 3.3 1023 m2 s-1. Superimposing the short pulse of the ECH also attained a maximum heat flux of ∼30 MW m-2. We have succeeded in achieving and characterizing the detachment of the high-temperature plasma, which is equivalent to the SOL plasma of tokamaks, by using the divertor simulation experimental module (D-module) in the GAMMA 10/PDX end cell, in spite of using a linear device with a short magnetic field line connection length. Various gases (Ar, Xe, Ne and N2) are examined to evaluate the effect of radiation cooling against the plasma flow at the MW m-2 level in the divertor simulation region and the following results are obtained: (i) Xe gas was most effective in the reduction of heat and particle fluxes (1%, 3%, respectively) and has a stronger effect on electron cooling (down to ∼1.6 eV) in the used gas species. (ii) Ne gas was less effective. On the other hand, (iii) N2 gas showed more favorable effects than Ar in the lower pressure range. These results will contribute to the progress in detached plasma operation and in clarifying the radiation cooling mechanism towards the development of future divertors.

Original languageEnglish
Article number116033
JournalNuclear Fusion
Volume57
Issue number11
DOIs
Publication statusPublished - 2017 Aug 9

Fingerprint

tandem mirrors
gases
magnetohydrodynamic flow
flux (rate)
cooling
simulation
heat flux
cells
fusion reactors
high temperature plasmas
radiation
detachment
low pressure
modules
heating
pulses
magnetic fields
electrons

Keywords

  • divertor simulation
  • GAMMA 10/PDX
  • plasma detachment
  • tandem mirror

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Nakashima, Y., Ichimura, K., Islam, M. S., Sakamoto, M., Ezumi, N., Hirata, M., ... Ueda, Y. (2017). Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror. Nuclear Fusion, 57(11), [116033]. https://doi.org/10.1088/1741-4326/aa7cb4

Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror. / Nakashima, Y.; Ichimura, K.; Islam, M. S.; Sakamoto, M.; Ezumi, N.; Hirata, M.; Ichimura, M.; Ikezoe, R.; Imai, T.; Kariya, T.; Katanuma, I.; Kohagura, J.; Minami, R.; Numakura, T.; Yoshikawa, M.; Iijima, T.; Islam, M. M.; Nojiri, K.; Shimizu, K.; Terakado, A.; Togo, S.; Asakura, N.; Fukumoto, M.; Hatayama, Akiyoshi; Hirooka, Y.; Kado, S.; Kubo, H.; Masuzaki, S.; Matsuura, H.; Nakano, T.; Nagata, S.; Nishino, N.; Ohno, N.; Sagara, A.; Sawada, K.; Shoji, M.; Tonegawa, A.; Ueda, Y.

In: Nuclear Fusion, Vol. 57, No. 11, 116033, 09.08.2017.

Research output: Contribution to journalArticle

Nakashima, Y, Ichimura, K, Islam, MS, Sakamoto, M, Ezumi, N, Hirata, M, Ichimura, M, Ikezoe, R, Imai, T, Kariya, T, Katanuma, I, Kohagura, J, Minami, R, Numakura, T, Yoshikawa, M, Iijima, T, Islam, MM, Nojiri, K, Shimizu, K, Terakado, A, Togo, S, Asakura, N, Fukumoto, M, Hatayama, A, Hirooka, Y, Kado, S, Kubo, H, Masuzaki, S, Matsuura, H, Nakano, T, Nagata, S, Nishino, N, Ohno, N, Sagara, A, Sawada, K, Shoji, M, Tonegawa, A & Ueda, Y 2017, 'Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror', Nuclear Fusion, vol. 57, no. 11, 116033. https://doi.org/10.1088/1741-4326/aa7cb4
Nakashima Y, Ichimura K, Islam MS, Sakamoto M, Ezumi N, Hirata M et al. Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror. Nuclear Fusion. 2017 Aug 9;57(11). 116033. https://doi.org/10.1088/1741-4326/aa7cb4
Nakashima, Y. ; Ichimura, K. ; Islam, M. S. ; Sakamoto, M. ; Ezumi, N. ; Hirata, M. ; Ichimura, M. ; Ikezoe, R. ; Imai, T. ; Kariya, T. ; Katanuma, I. ; Kohagura, J. ; Minami, R. ; Numakura, T. ; Yoshikawa, M. ; Iijima, T. ; Islam, M. M. ; Nojiri, K. ; Shimizu, K. ; Terakado, A. ; Togo, S. ; Asakura, N. ; Fukumoto, M. ; Hatayama, Akiyoshi ; Hirooka, Y. ; Kado, S. ; Kubo, H. ; Masuzaki, S. ; Matsuura, H. ; Nakano, T. ; Nagata, S. ; Nishino, N. ; Ohno, N. ; Sagara, A. ; Sawada, K. ; Shoji, M. ; Tonegawa, A. ; Ueda, Y. / Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror. In: Nuclear Fusion. 2017 ; Vol. 57, No. 11.
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abstract = "This paper describes the recent progress in divertor simulation research using the GAMMA 10/PDX tandem mirror towards the development of divertors in fusion reactors. During a plasma flow generation experiment in the end cell of the GAMMA 10/PDX, ICRF heating in the anchor cell successfully extended the particle flux up to 3.3 1023 m2 s-1. Superimposing the short pulse of the ECH also attained a maximum heat flux of ∼30 MW m-2. We have succeeded in achieving and characterizing the detachment of the high-temperature plasma, which is equivalent to the SOL plasma of tokamaks, by using the divertor simulation experimental module (D-module) in the GAMMA 10/PDX end cell, in spite of using a linear device with a short magnetic field line connection length. Various gases (Ar, Xe, Ne and N2) are examined to evaluate the effect of radiation cooling against the plasma flow at the MW m-2 level in the divertor simulation region and the following results are obtained: (i) Xe gas was most effective in the reduction of heat and particle fluxes (1{\%}, 3{\%}, respectively) and has a stronger effect on electron cooling (down to ∼1.6 eV) in the used gas species. (ii) Ne gas was less effective. On the other hand, (iii) N2 gas showed more favorable effects than Ar in the lower pressure range. These results will contribute to the progress in detached plasma operation and in clarifying the radiation cooling mechanism towards the development of future divertors.",
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AU - Ichimura, K.

AU - Islam, M. S.

AU - Sakamoto, M.

AU - Ezumi, N.

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 - Iijima, T.

AU - Islam, M. M.

AU - Nojiri, K.

AU - Shimizu, K.

AU - Terakado, A.

AU - Togo, S.

AU - Asakura, N.

AU - Fukumoto, M.

AU - Hatayama, Akiyoshi

AU - Hirooka, Y.

AU - Kado, S.

AU - Kubo, H.

AU - Masuzaki, S.

AU - Matsuura, H.

AU - Nakano, T.

AU - Nagata, S.

AU - Nishino, N.

AU - Ohno, N.

AU - Sagara, A.

AU - Sawada, K.

AU - Shoji, M.

AU - Tonegawa, A.

AU - Ueda, Y.

PY - 2017/8/9

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AB - This paper describes the recent progress in divertor simulation research using the GAMMA 10/PDX tandem mirror towards the development of divertors in fusion reactors. During a plasma flow generation experiment in the end cell of the GAMMA 10/PDX, ICRF heating in the anchor cell successfully extended the particle flux up to 3.3 1023 m2 s-1. Superimposing the short pulse of the ECH also attained a maximum heat flux of ∼30 MW m-2. We have succeeded in achieving and characterizing the detachment of the high-temperature plasma, which is equivalent to the SOL plasma of tokamaks, by using the divertor simulation experimental module (D-module) in the GAMMA 10/PDX end cell, in spite of using a linear device with a short magnetic field line connection length. Various gases (Ar, Xe, Ne and N2) are examined to evaluate the effect of radiation cooling against the plasma flow at the MW m-2 level in the divertor simulation region and the following results are obtained: (i) Xe gas was most effective in the reduction of heat and particle fluxes (1%, 3%, respectively) and has a stronger effect on electron cooling (down to ∼1.6 eV) in the used gas species. (ii) Ne gas was less effective. On the other hand, (iii) N2 gas showed more favorable effects than Ar in the lower pressure range. These results will contribute to the progress in detached plasma operation and in clarifying the radiation cooling mechanism towards the development of future divertors.

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