Energy transport in tokamak plasmas with central current density control using fast waves

C. B. Forest, C. C. Petty, M. E. Austin, F. W. Baity, K. H. Burrell, S. C. Chiu, M. S. Chu, P. Gohil, A. W. Hyatt, H. Ikezi, E. A. Lazarus, M. Murakami, R. I. Pinsker, M. Porkolab, R. Prater, B. W. Rice, G. M. Staebler, E. J. Strait, T. S. Taylor

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Fast wave current drive has been used to substantially modify the central current density profile in a tokamak plasma. Counter-fast wave current drive (FWCD) applied to discharges with negative central magnetic shear enhances the shear reversal and leads to a distinct transition to a mode of improved core confinement. In this state, the electron thermal diffusivity decreases by \(50+/-20\)% and the ion diffusivity by \(80+/-20\)%, compared to just before the transition. The FWCD and electron heating elucidates the role of the current profile on confinement and stability.

Original languageEnglish
Pages (from-to)3141-3144
Number of pages4
JournalPhysical review letters
Volume77
Issue number15
DOIs
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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