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Due to the possibility of representing the solution of the EM wave equations everywhere in a plasma medium by a simple and uniform asymptotic expansion, the problem of the weak field side RF heating has been globally and self-consistently approached. Both propagation and absorption have been included all along from the source - the antennas - to the sink - the plasma particles. It is shown that, as a result of contradictory requirements imposed by the physics of this global problem, the heating efficiency has a maximum in terms of the two main parameters, antenna width and minority concentration. This means that large width antennas presently considered are not the best ones for heating. Furthermore, the part of the RF power which is not used to heat the plasma particle is shown to heat particles in the peripheral plasma in the shadow of the limiter by collisional heating. These heated particles in turn are producing extra impurity influx by increased sputtering. This is why operating the weak field size RF heating at optimum values in order to minimize the impurity production is so important in view of future large size experiments.

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Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC-1192 EN, 1983
Availability: Can be ordered online
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