An investigation of density fluctuations and electron transport in the Madison Symmetric Torus reversed-field pinch

• DOI: 10.1063/1.1378328
• Publication Date: 2002-07-26T14:18:02Z
• Authors: N. E. Lanier; D. Craig; J. K. Anderson; T. M. Biewer; B. E. Chapman; D. J. Den Hartog; C. B. Forest; S. C. Prager; D. L. Brower; Y. Jiang
• Keywords: Reversed field pinch; Field line

The origin of large scale density fluctuations and their role in electron transport has been investigated the Madison Symmetric Torus reversed-field pinch [R. N. Dexter et al., Fusion Tech. 19, 131 (1991)]. At medium frequencies (10–30 kHz), ñ is associated with core-resonant magnetic having poloidal mode number m=1 toroidal numbers n=6–10. These chord-averaged are shown to be coherent radial flow fluctuations, permitting fluctuation-induced particle flux form 〈ñṽr〉 studied. In edge, although amplitudes large, ṽr out phase, consistent advection mean gradient by perturbed field lines no transport. During improved confinement discharges, produced inductive current drive, both fluctuation total greatly reduced over entire plasma cross section.