High power ion Bernstein wave experiments on DIII-D
Conference
·
OSTI ID:6190434
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
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANTENNAS
BERNSTEIN MODE
CLOSED PLASMA DEVICES
DOUBLET-3 DEVICE
ELECTRICAL EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
HEATING
OSCILLATION MODES
PLASMA HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANTENNAS
BERNSTEIN MODE
CLOSED PLASMA DEVICES
DOUBLET-3 DEVICE
ELECTRICAL EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
HEATING
OSCILLATION MODES
PLASMA HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES