Current profile modification experiments in EXTRAP T2R
2004 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 46, no 1, 145-161 p.Article in journal (Refereed) Published
Pulsed poloidal current drive (PPCD) experiments have been conducted in the resistive shell EXTRAP T2R reversed-field pinch experiment. During the current profile modification phase, the fluctuation level of the m = 1 internally resonant tearing modes decreases, and the velocity of these modes increases. The m = 0 modes are not affected during PPCD, although termination occurs with a burst in the m = 0 amplitude. The PPCD phase is characterized by an increase in the central electron temperature (up to 380 eV) and in the soft x-ray signal. Spectroscopic observations confirm an increase in the central electron temperature. During PPCD, the plasma poloidal beta increases to 14%, and the estimated energy confinement time doubles, reaching 380 mus. The reduction in the fluctuation level and the corresponding increase in the energy confinement time are qualitatively consistent with a reduction in parallel transport along stochastic magnetic field lines.
Place, publisher, year, edition, pages
2004. Vol. 46, no 1, 145-161 p.
reversed-field pinch, poloidal current drive, improved confinement, transport reduction, resistive wall, plasma, rfx, instabilities, ppcd
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-23156DOI: 10.1088/0741-3335/46/1/009ISI: 000188869600010ScopusID: 2-s2.0-0942266551OAI: oai:DiVA.org:kth-23156DiVA: diva2:341854
QC 20100525 QC 201111012010-08-102010-08-102011-11-01Bibliographically approved