Transport reduction by current profile control in the reversed-field pinch

J. S. Sarff, A. F. Almagri, M. Cekic, C. S. Chaing, D. Craig, D. J. Den Hartog, G. Fiksel, S. A. Hokin, R. W. Harvey, H. Ji, C. Litwin, S. C. Prager, D. Sinitsyn, C. R. Sovinec, J. C. Sprott, E. Uchimoto

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

An auxiliary poloidal inductive electric field applied to a reversed-field pinch (RFP) plasma reduces the current density gradient, slows the growth of m = 1 tearing fluctuations, suppresses their associated sawteeth, and doubles the energy confinement time. This experiment attacks the dominant RFP plasma loss mechanism of parallel streaming in a stochastic magnetic field. The auxiliary electric field flattens the current profile and reduces the magnetic fluctuation level. Since a toroidal flux change linking the plasma is required to generate the inductive poloidal electric field, the current drive is transient to avoid excessive perturbation of the equilibrium. To sustain and enhance the improved state, noninductive current drivers are being developed. A novel electrostatic current drive scheme uses a plasma source for electron injection, and the lower-hybrid wave is a good candidate for radio-frequency current drive.

Original languageEnglish (US)
Pages (from-to)2440-2446
Number of pages7
JournalPhysics of Plasmas
Volume2
Issue number6
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Sarff, J. S., Almagri, A. F., Cekic, M., Chaing, C. S., Craig, D., Den Hartog, D. J., Fiksel, G., Hokin, S. A., Harvey, R. W., Ji, H., Litwin, C., Prager, S. C., Sinitsyn, D., Sovinec, C. R., Sprott, J. C., & Uchimoto, E. (1995). Transport reduction by current profile control in the reversed-field pinch. Physics of Plasmas, 2(6), 2440-2446. https://doi.org/10.1063/1.871268