IBW and Fast Wave Launching and Damping on TFTR
Antennas to provide direct IBW (ion-Bernstein wave) excitation and to improve the launched spectrum and power handling for mode-coverted (MC) IBW excitation have been installed on TFTR (Tokamak Fusion Test Reactor) to support studies of transport barrier formation inside the TFTR plasma. Initial IBW launching/heating experiments have been performed at f(subscript) rf (nonsubsript) = 76 MHz and 50.6 MHz for several antenna and plasma positions, several mangetic fields [D, T, H, (superscript) 3 (nonsuperscript) He resonances], and with and without neutral-beam injection. Although the measured surface density profiles in front of the antenna should theoretically support IBW launching to the plasma core via EPW (electron plasma wave) excitation, loading resistance parameter dependence and heating results suggest that the wave energy is being deposited mostly in the plasma periphery. The potential roles of surface fast-wave and near-field excitation/damping on the IBW performance are discussed. Also MC IBW damping of the fast wave has been significantly improved through the removal of lithium 7 from the plasma.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 16443
- Report Number(s):
- CFP-3709; CONF-9704102--; ON: DE98051287
- Country of Publication:
- United States
- Language:
- English
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