High power ion Bernstein wave experiments on DIII-D
Previous tokamak experiments with Ion Bernstein Wave (IBW) heating have exhibited efficient central ion heating and associated improvement in particle confinement. The prospect of localized bulk ion heating, along with the prediction that coupling to the IBW should improve under edge conditions characteristic of H-mode plasmas, motivated the present IBW program on the DIII-D tokamak. The 30-60 MHz tunability of the modified 2.25 MW FMIT rf power supply permits consideration of many different heating scenarios; in which central ion heating at 3/2..cap omega../sub H/ with a small He/sup 4/ minority (3..cap omega../sub He/sup 4//) was observed. Therefore, the transmitter frequency was 38 MHz and the nominal central toroidal field was B/sub T/ = 1.8 T, which places the 3/2..cap omega../sub H/(3..cap omega../sub He/sup 4//) layer a few centimeters outboard of the magnetic axis, and the 2..cap omega../sub H/ layer just behind the radiating element in the antenna, as is required theoretically for efficient coupling to the IBW. 8 refs., 3 figs
- Research Organization:
- General Atomics, San Diego, CA (USA)
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 6190434
- Report Number(s):
- GA-A-19662; CONF-8905120-12; ON: DE89013308
- Resource Relation:
- Conference: 8. topical conference on radio frequency power in plasmas, Irvine, CA, USA, 1 May 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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DOUBLET-3 DEVICE
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ANTENNAS
BERNSTEIN MODE
FREQUENCY DEPENDENCE
CLOSED PLASMA DEVICES
ELECTRICAL EQUIPMENT
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HEATING
OSCILLATION MODES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
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