Stationary multifaceted asymmetric radiation from the edge and improved confinement mode in a superconducting tokamak
X. Gao, J. K. Xie, Y. X. Wan, K. Ushigusa, B. N. Wan, S. Y. Zhang, J. Li, G. L. Kuang
DOI 10.1103/PhysRevE.65.017401 · Physical Review E
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Abstract
Stationary multifaceted asymmetric radiation from the edge (MARFE) is studied by gas-puffing feedback control according to an empirical MARFE critical density (∼1.8×1013cm−3) in the HT-7 Ohmic discharges (where the plasma current Ip is about 170 kA, loop voltage Vloop=2–3V, toroidal field BT=1.9T, and Zeff=3–4). It is observed that an improved confinement mode characterized by Dα line emissions drops and the line-averaged density increase is triggered in the stationary MARFE discharges. The mode is not a symmetric “detachment” state, because the quasi-steady-state poloidally asymmetric radiation (e.g., C III line emissions) still exists. This phenomenon has not been predicted by the current MARFE theory.
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