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| EFD-C(10)06/19 |
ICRF Mode Conversion Flow Drive in JET D(3He) Plasmas and Comparison with Results from Alcator C-Mod |
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Y. Lin, P. Mantica, T. Hellsten, E. Lerche, M.F.F. Nave, J.E. Rice, D. Van Eester,
P.C. de Vries, R. Felton, C. Giroud, V. Kiptily, T. Tala
and JET EFDA contributors
Abstract. Following a recent Alcator C-Mod experiment on ICRF mode conversion flow drive, we have carried out a similar experiments in JET D(3He) plasmas: Bt0 = 3.45T at R0 = 2.97m, Ip = 2.8 and 1.8MA, central density ne0 ~ 3¥1019 m-3 during flat top, and in L-mode confinement. The plasma current was in the same direction as the toroidal B field. All the plasmas were in D majority with external 3He puffing. The 3He concentration X(3He) nHe3/ne, was feedback controlled in real-time, and scanned pulse by pulse. X(3He) was estimated from visible spectroscopy light in the divertor, linking relative light intensities to relative concentrations. The ICRF power was at 33MHz. At Bt0 = 3.45T, the 3He ion cyclotron resonance layer was about 20cm to the low field side of the magnetic axis. For X(3He) ~ 13%, the D-3He hybrid layer was about 10cm to the high-field-side of the magnetic axis. The ICRF antennas were at -900 phasing, i.e., the launched fast waves were toroidally asymmetric predominantly in the counter-Ip direction. The toroidal angular velocity wf of C6+ is measured by the core CXRS system during beam blips. Pulse No: 78845, counter-Ip rotation (wf < 0) was observed during all the blips for t < 11 sec, and the rotation only became co-Ip later in the pulse with continuous neutral beam injection. A scintillator probe measured the energy and pitch angle of lost fast ions . The detection of 3.7MeV a-particles, born from the nuclear reaction between D and 3He, indicates a hot 3He ion population near the plasma centre. Preprint of Paper to be submitted for publication in Proceedings of the 37th EPS Conference on Plasma Physics, Dublin, Ireland. (21st June 2010 - 25th June 2010) |
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