Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak

M. R. Wade, T. C. Luce, P. A. Politzer, J. R. Ferron, S. L. Allen, M. E. Austin, D. R. Baker, B. Bray, D. P. Brennen, K. H. Burrell, T. A. Casper, M. S. Chu, J. C. DeBoo, E. J. Doyle, A. M. Garofalo, P. Gohil, I. A. Gorelov, C. M. Greenfield, R. J. Groebner, W. W. HeidbrinkC. L. Hsieh, A. W. Hyatt, R. Jayakumar, J. E. Kinsey, R. J. La Haye, L. L. Lao, C. J. Lasnier, E. A. Lazarus, A. W. Leonard, Y. R. Lin-Liu, J. Lohr, M. A. Mahdavi, M. A. Makowski, M. Murakami, C. C. Petty, R. I. Pinsker, R. Prater, C. L. Rettig, T. L. Rhodes, B. W. Rice, E. J. Strait, T. S. Taylor, D. M. Thomas, A. D. Turnbull, J. G. Watkins, W. P. West, K. L. Wong

Research output: Contribution to journalConference article

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Abstract

Significant progress has been made in obtaining high-performance discharges for many energy confinement times in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Fusion Research (International Atomic Energy Agency, Vienna, 1987). Vol. I, p. 159]. Normalized performance (measured by the product of βNH89 and indicative of the proximity to both conventional β limits and energy confinement quality, respectively) ∼10 has been sustained for >5 τE with qmin> 1.5. These edge localized modes (ELMing) H-mode discharges have β∼5%, which is limited by the onset of resistive wall modes slightly above the ideal no-wall n = 1 limit, with approximately 75% of the current driven noninductively. The remaining Ohmic current is localized near the half-radius. The DIII-D electron cyclotron heating system is being upgraded to replace this inductively driven current with localized electron cyclotron current drive (ECCD). Density control, which is required for effective ECCD, has been successfully demonstrated in long-pulse high-performance ELMing H-mode discharges with βNH89∼7 for up to 6.3 s. In plasma shapes compatible with good density control in the present divertor configuration, the achieved βN is somewhat less than that in the high βNH89 = 10 discharges.

Original languageEnglish
Pages (from-to)2208-2216
Number of pages9
JournalPhysics of Plasmas
Volume8
Issue number5 II
DOIs
Publication statusPublished - 2001 May 1
Event42nd Annual Meeting of the APS Division of Plasma Physics - Quebec, Que, Canada
Duration: 2000 Oct 232000 Oct 27

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Wade, M. R., Luce, T. C., Politzer, P. A., Ferron, J. R., Allen, S. L., Austin, M. E., Baker, D. R., Bray, B., Brennen, D. P., Burrell, K. H., Casper, T. A., Chu, M. S., DeBoo, J. C., Doyle, E. J., Garofalo, A. M., Gohil, P., Gorelov, I. A., Greenfield, C. M., Groebner, R. J., ... Wong, K. L. (2001). Progress toward long-pulse high-performance Advanced Tokamak discharges on the DIII-D tokamak. Physics of Plasmas, 8(5 II), 2208-2216. https://doi.org/10.1063/1.1355980