Current profile modification experiments in EXTRAP T2R

M. Cecconello, J.-A. Malmberg, G. Spizzo, B.E. Chapman, R.M. Gravestjin, P. Franz, P. Piovesan, P. Martin, J.R. Drake

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Abstract

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.
Original languageEnglish
Pages (from-to)145 - 161
Number of pages17
JournalPlasma Physics and Controlled Fusion
Volume46
Issue number1
DOIs
Publication statusPublished - Jan 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Nuclear and High Energy Physics

Cite this

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