ICRF heating experiments on DIII-D

Conference · Tue Oct 01 00:00:00 EDT 1991

OSTI ID:6028133

Pinsker, R I; Mayberry, M J; Petty, C C; Chiu, S C; Prater, R ^[1]; Porkolab, M ^[2]; Baity, F W; Goulding, R H; Hoffman, D J ^[3]

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1. General Atomics, San Diego, CA (United States)
2. Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
3. Oak Ridge National Lab., TN (United States)

Fast wave ICRH in the fundamental hydrogen minority and second harmonic hydrogen majority regimes efficiently heats the D3-D tokamak plasma. Agreement with confinement scaling laws derived from NBI shows that the antenna coupled efficiently to the FW and that the power was almost completely absorbed near the center of the plasma. However, when a similar antenna was oriented to excite the IBW, no efficient central heating regime was found. These experiments covered a very wide range of experimental conditions and configurations. The results show that either the antenna did not couple efficiently to the IBW, or that the IBW did not propagate to the center of the discharge. Nonlinear effects were observed in the experiment which led to a plausible explanation of the experimental results based on nonlinear wave coupling, wave propagation, and dissipation mechanisms. Both the observed antenna coupling properties and the observed heating in the scrapeoff layer were accounted for in this scenario. These nonlinear effects limit the applicability of the conventional linear picture of IBW antenna coupling and propagation in high power, low frequency (f {approx lt} 100 MHz) experiments. 12 refs., 6 figs.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114; AC05-84OR21400
• OSTI ID: 6028133
• Report Number(s): GA-A-20697; CONF-910869-24; ON: DE92002948
• Resource Relation: Conference: 9. topical conference on radio frequency power in plasmas, Charleston, SC (United States), 19-21 Aug 1991
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
ICR HEATING
ANTENNAS
BERNSTEIN MODE
PLASMA SCRAPE-OFF LAYER
SCALING LAWS
WAVE PROPAGATION
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
ELECTRICAL EQUIPMENT
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
LAYERS
OSCILLATION MODES
PLASMA HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)