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The phenomenology of attachment, detachment and the intermediate state of detaching of both ohmically heated and auxiliary heated limiter plasmas is given with emphasis on detailed edge modifications, radiation levels and confinement. This work constitutes the first systematic study of the auxiliary heating of detached plasmas. As in ohmic discharges, where detachment gives rise to confinement roll-over at high densities, its occurrence in auxiliary heating discharges leads to lower confinement than under attached conditions. Detached-to-attached transitions are possible and show a number of sometimes striking similarities in confinement and edge behaviour with reported L-H transitions in limiter tokamaks. The energy gain upon D-A transition is not the result of an increased incremental confinement time but can be described as a synergetic improvement of ohmic confinement.

Additional information

Authors: WEYNANTS R R, Laboratoire de Physique des Plasmas, École Royale Militaire, Bruxelles (BE);SAMM U, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Report: 88 EN (1988)
Availability: Available from École Royale Militaire, 1040 Bruxelles (BE)
Record Number: 198910755 / Last updated on: 1994-12-01
Original language: en
Available languages: en