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Abstract

The confinement time for an ohmically heated, low beta, tokamak is well described by the scaling law tau alpha n. This implies that beta should increase linearly with additional auxiliary heating power. In fact the increase is much slower, and confinement deteriorates with increasing auxiliary heating. We examine the possibility that this deterioration is due to the localized onset of mhd ballooning instabilities, with confinement elsewhere continuing to follow the law established for ohmic discharges. We find that the overall effect of the ballooning instability is indeed gradual and the resultant confinement time corresponds to a scaling law in good agreement with that reported for auxiliary heated tokamaks.

Additional information

Authors: CONNOR J W, CULHAM LABORATORY, ABINGDON (UK);TAYLOR J B, CULHAM LABORATORY, ABINGDON (UK);TURNER M F CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON. OX14 3DB (UK), MENTIONING REPORT CLM-P-715, 1984
Record Number: 1989122084700 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en