Recent improvements in confinement and beta in the MST reversed-field pinch

D. J. Den Hartog, J. W. Ahn, A. F. Almagri, J. K. Anderson, A. D. Beklemishev, A. P. Blair, F. Bonomo, M. T. Borchardt, D. L. Brower, D. R. Burke, M. Cengher, B. E. Chapman, S. Choi, D. J. Clayton, W. A. Cox, S. K. Combs, D. Craig, H. D. Cummings, V. I. Davydenko, D. R. DemersB. H. Deng, W. X. Ding, F. Ebrahimi, D. A. Ennis, G. Fiksel, C. Foust, C. B. Forest, P. Franz, L. Frassinetti, S. Gangadhara, J. A. Goetz, R. W. Harvey, D. J. Holly, B. F. Hudson, A. A. Ivanov, M. C. Kaufman, A. V. Kuritsyn, A. A. Lizunov, T. W. Lovell, R. M. Magee, L. Marrelli, P. Martin, K. J. McCollam, M. C. Miller, V. V. Mirnov, P. D. Nonn, R. O'Connell, S. P. Oliva, P. Piovesan, S. C. Prager, I. Predebon, J. A. Reusch, J. S. Sarff, V. A. Svidzinski, T. D. Tharp, M. A. Thomas, Yu A. Tsidulko, M. D. Wyman, T. Yates

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Abstract

In the general area of confinement improvement and concept advancement, recent results in the Madison Symmetric Torus (MST) reversed-field pinch (RFP) include good confinement of both thermal and large-orbit ions and near doubling of total beta to 26% with deuterium pellet injection. Current profile control enables MST to reduce stochastic transport and achieve tokamak-like confinement. In standard RFP operation, substantial MHD tearing mode activity results in stochastic transport and an energy confinement time of about 1 ms in MST. Application of inductive current profile control reduces MHD activity and accompanying stochasticity, improving confinement by about a factor of ten. Previous work concentrated on electron confinement in improved-confinement RFP operation. Recent work confirms that ions are also well confined, and that high beta and improved confinement can be achieved simultaneously.

Original languageEnglish (US)
Pages (from-to)L17-L20
JournalNuclear Fusion
Volume47
Issue number9
DOIs
StatePublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Den Hartog, D. J., Ahn, J. W., Almagri, A. F., Anderson, J. K., Beklemishev, A. D., Blair, A. P., Bonomo, F., Borchardt, M. T., Brower, D. L., Burke, D. R., Cengher, M., Chapman, B. E., Choi, S., Clayton, D. J., Cox, W. A., Combs, S. K., Craig, D., Cummings, H. D., Davydenko, V. I., ... Yates, T. (2007). Recent improvements in confinement and beta in the MST reversed-field pinch. Nuclear Fusion, 47(9), L17-L20. https://doi.org/10.1088/0029-5515/47/9/L01