DIVIMP Modeling of the Toroidally-Symmetrical Injection of 13CH4 Into the Upper SOL of DIII-D. PDF Download

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DIVIMP Modeling of the Toroidally-Symmetrical Injection of 13CH4 Into the Upper SOL of DIII-D.

DIVIMP Modeling of the Toroidally-Symmetrical Injection of 13CH4 Into the Upper SOL of DIII-D. PDF Author: S. L. Allen
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Book Description
As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of {sup 13}CH{sub 4} at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M{sub l} {approx} 0.4 directed toward the inner divertor. The CH{sub 4} is ionized in the periphery of the SOL and so the particle confinement time, {tau}{sub c}, is not high, only {approx}5 ms, and about 4X lower than if the CH{sub 4} were ionized at the separatrix. For such a wall injection location, however, most of the CH{sub 4} gets ionized to C{sup +}, C{sup ++}, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.