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Abstract

In the recent divertor experiments on DITE Tokamak gas refuelling in the divertor chamber has been used with D2 pressures of up to 30 mTorr. At these high pressures the ionisation rate in the divertor plasma, calculated from the molecular flux across the plasma boundary using a 1-D simulation, is more than an order of magnitude higher than any ionisation source term consistent with the measured diverted plasma parameters. Similarly the predicted D-alpha emission is substantially greater than that measured. These inconsistencies are removed by introducing the requirement of a pressure balance at the plasma boundary between the influx of room temperature molecules, and the associated outflux of energetic (few eV) dissociated and charge exchange atoms. This considerably reduces the net molecular flow across the plasma boundary, and hence the ionisation rate and D-alpha emission.

Additional information

Authors: FIELDING S J, CULHAM LABORATORY, ABINGDON, OXON. (UK);JOHNSON P C, CULHAM LABORATORY, ABINGDON, OXON. (UK);GUILHEM D CULHAM LABORATORY, ABINGDON, OXON. (UK), CULHAM LABORATORY, ABINGDON, OXON. (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, CULHAM LABORATORY, ABINGDON, OXON. OX14 3DB (UK), MENTIONING REPORT CLM-P-721, 1984
Record Number: 1989123044200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en