High- Β, improved confinement reversed-field pinch plasmas at high density

M. D. Wyman, B. E. Chapman, J. W. Ahn, A. F. Almagri, J. K. Anderson, F. Bonomo, D. L. Brower, S. K. Combs, D. Craig, D. J. Den Hartog, B. H. Deng, W. X. Ding, F. Ebrahimi, D. A. Ennis, G. Fiksel, C. R. Foust, P. Franz, S. Gangadhara, J. A. Goetz, R. O'ConnellS. P. Oliva, S. C. Prager, J. A. Reusch, J. S. Sarff, H. D. Stephens, T. Yates

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Abstract

In Madison Symmetric Torus [Dexter, Fusion Technol. 19, 131 (1991)] discharges where improved confinement is brought about by modification of the current profile, pellet injection has quadrupled the density, reaching ne =4× 1019 m-3. Without pellet injection, the achievable density in improved confinement discharges had been limited by edge-resonant tearing instability. With pellet injection, the total beta has been increased to 26%, and the energy confinement time is comparable to that at low density. Pressure-driven local interchange and global tearing are predicted to be linearly unstable. Interchange has not yet been observed experimentally, but there is possible evidence of pressure-driven tearing, an instability usually driven by the current gradient in the reversed-field pinch.

Original languageEnglish (US)
Article number010701
JournalPhysics of Plasmas
Volume15
Issue number1
DOIs
StatePublished - Feb 7 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Wyman, M. D., Chapman, B. E., Ahn, J. W., Almagri, A. F., Anderson, J. K., Bonomo, F., Brower, D. L., Combs, S. K., Craig, D., Den Hartog, D. J., Deng, B. H., Ding, W. X., Ebrahimi, F., Ennis, D. A., Fiksel, G., Foust, C. R., Franz, P., Gangadhara, S., Goetz, J. A., ... Yates, T. (2008). High- Β, improved confinement reversed-field pinch plasmas at high density. Physics of Plasmas, 15(1), [010701]. https://doi.org/10.1063/1.2835439