ICRH-produced H-modes in the JET tokamak

V. P. Bhatnagar, J. Jacquinot, B. J.D. Tubbing, D. Stork, A. Tanga, B. Balet, G. Bosia, M. Bures, D. Campbell, S. Clement, A. Hatayama, K. Lawson, F. Tibone, D. F.H. Start

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Abstract

H-modes produced by ion-cyclotron resonance heating (ICRH) in a double-null X-point open divertor configuration in the JET Tokamak are studied, where the ICRH antennas, operated in the dipole (0, pi ) phasing, are located on the low-field side of the Tokamak. Beryllium evaporation on the nickel antenna screen and the first wall of the Tokamak played a crucial role in achieving H-modes with ICRH alone. In these discharges, all the characteristics typical of neutral-beam injection heating H-modes are found, and the global energy confinement time approaches two times the Goldston L-mode prediction. For most of their duration, ICRH H-modes are free from ELMs (edge-localized modes). In addition, the monster sawtooth (long sawtooth-free period) feature of ICRH is maintained during H-modes, leading to a central electron temperature (T c0) of 10 keV, nearly twice the value of the central ion temperature (Ti0). ICRH H-modes often occur as a two-step transition and the antenna plasma coupling resistance (Rc) also decreases in two steps. Theoretical values of Rc agree well with experimental values during the H-phase.

Original languageEnglish
Article number002
Pages (from-to)99-121
Number of pages23
JournalPlasma Physics and Controlled Fusion
Volume33
Issue number2
DOIs
Publication statusPublished - 1991 Dec 1

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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    Bhatnagar, V. P., Jacquinot, J., Tubbing, B. J. D., Stork, D., Tanga, A., Balet, B., Bosia, G., Bures, M., Campbell, D., Clement, S., Hatayama, A., Lawson, K., Tibone, F., & Start, D. F. H. (1991). ICRH-produced H-modes in the JET tokamak. Plasma Physics and Controlled Fusion, 33(2), 99-121. [002]. https://doi.org/10.1088/0741-3335/33/2/002