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 μs. 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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Condensed Matter Physics
- Nuclear and High Energy Physics
Cecconello, M., Malmberg, J-A., Spizzo, G., Chapman, B. E., Gravestjin, R. M., Franz, P., ... Drake, J. R. (2004). Current profile modification experiments in EXTRAP T2R. Plasma Physics and Controlled Fusion, 46(1), 145 - 161. https://doi.org/10.1088/0741-3335/46/1/009