Plasma loading and wave generation for ICRH in the ST Tokamak
Plasma loading and wave generation for two half-turn loops operating at 25 MHz are being investigated on the ST Tokamak at power levels up to 1 MW. The equivalent series resistance R/sub s/ = P/sub rf//I$sup 2$/sub rf/, measured as a function of $Omega$ = $omega$$/$$omega$/sub ci/(r = 0) and plasma density, is found to be in good agreement with the predictions of the cylindrical theory. R/sub s/ values as high as several ohms are obtained at high densities giving wave generation efficiencies well above 90 percent. Loading near $Omega$ = 1 and 2 is apparently independent of power level. Measurements of B/sub zrf/ at 20 locations about the torus reveal the predicted wave generation; m = 0, +1 slow waves in the vicinity of $Omega$ = 1, m = -1 fast waves after the expected onset (usually $Omega$ greater than or equal to 1), and m = 0, +1 fast waves for higher $Omega$. Toroidal eigenmodes accompanied by large loading are detected for the fast waves when the damping lengths are long. (auth)
- Research Organization:
- Princeton Univ., NJ; Texas Tech Univ., Lubbock (USA). Plasma Lab.
- NSA Number:
- NSA-33-011608
- OSTI ID:
- 4119599
- Report Number(s):
- CONF-740642-
- Resource Relation:
- Conference: 2. topical conference on RF plasma heating, Lubbock, Texas, USA, 20 Jun 1974; Other Information: Orig. Receipt Date: 30-JUN-76; Related Information: Proceedings of the second topical conference on RF plasma heating
- Country of Publication:
- United States
- Language:
- English
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