IMPURITY BEHAVIOUR FOR VARIOUS AUXILIARY HEATING METHODS IN ASDEX
Three different additional heating methods are being applied in the ASDEX divertor tokamak: neutral injection (NI), ion cyclotron heating (ICRH) at the 2nd harmonic of hydrogen, and lower hybrid heating (LH). In scenarios. Applying all three methods of the same tokamak has the advantage of allowing a fair comparison of the concomitant impurity problems. Such a phenomenological comparison of the impurity levels has been made for the most important elements Fe, Ti, O, and C. A more profound judgement of the impurity problem, however, will have to distinguish between impurity production, penetration depth of the neutrals into the plasma regions. The problem of sputtering of wall material (Fe) by CX neutrals during NI and evidence for the predominance of ion sputtering in the case of both HF heating methods are briefly discussed.?
Bibliographic Reference: 12TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, BUDAPEST (HUNGARY), SEPT. 2-6, 1985 WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP III/107, 1985, PP. 61-64.
Record Number: 1989124096100 / Last updated on: 1987-01-01
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