Recent progress in the superconducting tokamak TRIAM-1M

S. Itoh, K. N. Sato, K. Nakamura, H. Zushi, M. Sakamoto, Kazuaki Hanada, Eriko Jotaki, K. Makino, S. Kawasaki, H. Nakashima, A. Iyomasa

Research output: Contribution to journalArticle

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Abstract

Extensive studies of a steady-state tokamak reactor have been carried out on the superconducting tokamak TRIAM-1M. A discharge of n̄e = 2 × 1018 m-3 lasting more than 2 h has been demonstrated using a 2.45 GHz lower hybrid current drive (LHCD). A high-density plasma of n̄e = 2 × 1019 m-3 has been sustained for 1 min using a 8.2 GHz LHCD under the high average wall loading of 5 MW m-2 on the limiter. Recently, a single-null divertor configuration with high elongation (κ = 1.5) was also successfully maintained for 1 min by the 2.45 GHz LHCD. A transition of the ion temperature (Ti) from 0.6 keV to about 2.5 keV is observed in 2.45 GHz LHCD plasmas; this operational regime is called the 'high ion temperature (HIT)' mode. The 'HIT' mode is characterized by the existence of a steep Ti gradient (≈50 keV m-1) near r/a ∼ 0.4. It is found that the 'HIT' mode appears in a narrow window of the electron density and horizontal plasma position. The 'HIT' mode can be successfully maintained for over 1 min with accurate control of the density and position.

Original languageEnglish
JournalPlasma Physics and Controlled Fusion
Volume41
Issue number3A
DOIs
Publication statusPublished - Jan 1 1999

Fingerprint

ion temperature
Ions
Temperature
Plasmas
Plasma density
Limiters
plasma density
elongation
Carrier concentration
Elongation
reactors
gradients
configurations

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Itoh, S., Sato, K. N., Nakamura, K., Zushi, H., Sakamoto, M., Hanada, K., ... Iyomasa, A. (1999). Recent progress in the superconducting tokamak TRIAM-1M. Plasma Physics and Controlled Fusion, 41(3A). https://doi.org/10.1088/0741-3335/41/3A/052

Recent progress in the superconducting tokamak TRIAM-1M. / Itoh, S.; Sato, K. N.; Nakamura, K.; Zushi, H.; Sakamoto, M.; Hanada, Kazuaki; Jotaki, Eriko; Makino, K.; Kawasaki, S.; Nakashima, H.; Iyomasa, A.

In: Plasma Physics and Controlled Fusion, Vol. 41, No. 3A, 01.01.1999.

Research output: Contribution to journalArticle

Itoh, S, Sato, KN, Nakamura, K, Zushi, H, Sakamoto, M, Hanada, K, Jotaki, E, Makino, K, Kawasaki, S, Nakashima, H & Iyomasa, A 1999, 'Recent progress in the superconducting tokamak TRIAM-1M', Plasma Physics and Controlled Fusion, vol. 41, no. 3A. https://doi.org/10.1088/0741-3335/41/3A/052
Itoh, S. ; Sato, K. N. ; Nakamura, K. ; Zushi, H. ; Sakamoto, M. ; Hanada, Kazuaki ; Jotaki, Eriko ; Makino, K. ; Kawasaki, S. ; Nakashima, H. ; Iyomasa, A. / Recent progress in the superconducting tokamak TRIAM-1M. In: Plasma Physics and Controlled Fusion. 1999 ; Vol. 41, No. 3A.
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