IBW and fast wave launching and damping on TFTR
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)
- Lodestar Research Corporation, Boulder, Colorado 80301 (United States)
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)
Antennas to provide direct IBW excitation and to improve the launched spectrum and power handling for mode converted (MC) IBW excitation have been installed on TFTR to support studies of transport barrier formation inside the TFTR plasma. Initial IBW launching/heating experiments have been performed at f{sub RF}{approx}76MHz and 50.6 MHz for several antenna and plasma positions, several magnetic fields (D, T, H, {sup 3}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 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. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 587020
- Report Number(s):
- CONF-9704102-; ISSN 0094-243X; TRN: 98:004473
- Journal Information:
- AIP Conference Proceedings, Vol. 403, Issue 1; Conference: 12. topical conference on radio frequency power in plasmas, Savannah, GA (United States), 1-3 Apr 1997; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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