Current ramp-up experiments in full current drive plasmas in TRIAM-1M

Kazuaki Hanada, K. Nakamura, Makoto Hasegawa, S. Itoh, H. Zushi, M. Sakamoto, Eriko Jotaki, S. V. Kulkarni, A. Iyomasa, S. Kawasaki, H. Nakashima, N. Yoshida, Kazutoshi Tokunaga, T. Fujiwara, O. Mitarai

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Four types of plasma current ramp-up experiments in full non-inductively lower hybrid current driven (LHCD) plasmas were executed in TRIAM-1M: (1) current start-up by a combination of electron cyclotron resonance heating (ECRH) and LHCD, (2) tail heating by additional LHCD, (3) bulk heating by ECRH and (4) spontaneous ramp-up by a transition to enhanced current drive (ECD) mode. The time evolutions of plasma current during four types of ramp-up phase were adjusted by a simple model with two different time constants, which are a time defined by the total current diffusion time and a time constant for improving the current drive efficiency. In the case of (1) and (4), the latter time constant is significant during the current ramp-up phase. The improvement in the current drive efficiency in the ECD mode is likely to be caused by the increase in the effective refractive index along the magnetic field of the lower hybrid wave.

Original languageEnglish
Pages (from-to)357-361
Number of pages5
JournalNuclear Fusion
Volume44
Issue number2
DOIs
Publication statusPublished - Feb 1 2004

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ramps
time constant
heating
plasma currents
electron cyclotron resonance
refractivity

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Current ramp-up experiments in full current drive plasmas in TRIAM-1M. / Hanada, Kazuaki; Nakamura, K.; Hasegawa, Makoto; Itoh, S.; Zushi, H.; Sakamoto, M.; Jotaki, Eriko; Kulkarni, S. V.; Iyomasa, A.; Kawasaki, S.; Nakashima, H.; Yoshida, N.; Tokunaga, Kazutoshi; Fujiwara, T.; Mitarai, O.

In: Nuclear Fusion, Vol. 44, No. 2, 01.02.2004, p. 357-361.

Research output: Contribution to journalArticle

Hanada, K, Nakamura, K, Hasegawa, M, Itoh, S, Zushi, H, Sakamoto, M, Jotaki, E, Kulkarni, SV, Iyomasa, A, Kawasaki, S, Nakashima, H, Yoshida, N, Tokunaga, K, Fujiwara, T & Mitarai, O 2004, 'Current ramp-up experiments in full current drive plasmas in TRIAM-1M', Nuclear Fusion, vol. 44, no. 2, pp. 357-361. https://doi.org/10.1088/0029-5515/44/2/019
Hanada, Kazuaki ; Nakamura, K. ; Hasegawa, Makoto ; Itoh, S. ; Zushi, H. ; Sakamoto, M. ; Jotaki, Eriko ; Kulkarni, S. V. ; Iyomasa, A. ; Kawasaki, S. ; Nakashima, H. ; Yoshida, N. ; Tokunaga, Kazutoshi ; Fujiwara, T. ; Mitarai, O. / Current ramp-up experiments in full current drive plasmas in TRIAM-1M. In: Nuclear Fusion. 2004 ; Vol. 44, No. 2. pp. 357-361.
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