High internal inductance improved confinement H-mode discharges obtained with an elongation ramp technique in the DIII-D tokamak

L. L. Lao, J. R. Ferron, T. S. Taylor, K. H. Burrell, V. S. Chan, M. S. Chu, J. C. Deboo, E. J. Doyle, C. M. Greenfield, R. J. Groebner, R. James, E. A. Lazarus, T. H. Osborne, H. St.john, E. J. Strait, S. J. Thompson, A. D. Turnbull, D. Wroblewski, H. Zohm

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Abstract

High confinement mode (H-mode) discharges with peaked toroidal current density profile (high internal inductance, li) and improved confinement are obtained in the DIII-D tokamak by dynamically varying the current profile using a rapid elongation ramp technique. The confinement improvement increases with li and persists in the presence of edge-localized modes. The plasma toroidal rotation and the corresponding radial electric field component also increase with the peakedness of the current density profile.

Original languageEnglish
Pages (from-to)3435-3438
Number of pages4
JournalPhysical review letters
Volume70
Issue number22
DOIs
Publication statusPublished - 1993 Jan 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lao, L. L., Ferron, J. R., Taylor, T. S., Burrell, K. H., Chan, V. S., Chu, M. S., Deboo, J. C., Doyle, E. J., Greenfield, C. M., Groebner, R. J., James, R., Lazarus, E. A., Osborne, T. H., St.john, H., Strait, E. J., Thompson, S. J., Turnbull, A. D., Wroblewski, D., & Zohm, H. (1993). High internal inductance improved confinement H-mode discharges obtained with an elongation ramp technique in the DIII-D tokamak. Physical review letters, 70(22), 3435-3438. https://doi.org/10.1103/PhysRevLett.70.3435