Energy Confinement in the Advanced RFP
2003 (English)Conference paper (Other academic)
In earlier numerical studies [1,2] of confinement in the optimized, conventional reversed-field pinch (RFP), the scaling of energy confinement time with plasma current and density was found to be too weak to lead into fusion relevant regimes. In the advanced RFP, however, the detrimental magnetic (dynamo) fluctuations are largely eliminated by the presence of an externally applied electric field. This field is adjusted to generate a tearing mode stable parallel current density profile. Previous studies [3,4] used a gaussian shaped electric field with given width and amplitude that was localised at some minor radius of the plasma. A threefold increase in energy confinement was found, but the three associated parameters made further optimisation difficult. In the present work a new, parameter free scheme for current profile control is introduced. An automatic control system continuously replaces the dynamo electric field. Early results indicate strong energy confinement enhancement.
 J. Scheffel and D. D. Schnack, Phys. Rev. Lett. 85 (2000) 322. J. Scheffel and D. D. Schnack, Nucl. Fusion 40 (2000) 1885. C. R. Sovinec and S. C. Prager, Nucl. Fusion 39 (1999) 777. J. Scheffel and D. D. Schnack, International RFP Workshop, Stockholm 2002.
Place, publisher, year, edition, pages
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-78589OAI: oai:DiVA.org:kth-78589DiVA: diva2:492665
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics; Albuquerque, New Mexico, 27-31 October 2003
QC 201311252012-02-082012-02-082013-11-25Bibliographically approved