ION - CYCLOTRON WAVE HEATING FROM EXTERIOR (WEAK FIELD)
Operation in modes : Conversion regime with interior (high field side) antenna, and minority regime with exterior (low field side) antenna carry a large impurity increase during the RF wave pulse. This paper aims to define the real place of the increase of impurities when projected to thermonuclear conditions. This requires to understand the role of the elements of the plasma - antennae system and to follow the power flow from sources to ultimate sinks. Theoretical analysis provides elements of judgement on whether there exists a more promising configuration to reach more safely thermonuclear conditions: Impurity productions being shown to be due to the compromise between small and large wavelengths and to the existence of a cut-off, the use of "carrying" waves is suggested, giving by nonlinear coupling the cyclotron wave at the place where heating occurs. Though nonlinear coupling is weak, the remarkable property of magnetosonic waves when used as carrying waves is to be such that a resonance takes place also at the cyclotron layer for the produced wave. The two waves 1-1 OMEGA-i, 1-2 OMEGA-i, /1-1 + 1-2/ = 1 should simply be launched at a small angle approximately equal to 7 degrees, creating a critical antenna inside the plasma where absorption takes place.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. I, PP. 357- 370 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA + VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), USD 6
Record Number: 1989124025700 / Last updated on: 1987-01-01
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