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Abstract

An MHD stability study is presented of plasmas with inverted q profiles, commonly encountered in steady state plasmas with a high bootstrap fraction. The infernal mode, a dangerous instability that only exists in plasmas with a low shear region, is also studied. It is found that this informal mode may be stabilised by moving the maximum pressure gradient to the region of high shear near the plasma boundary, although this can have an undesirable effect on the ballooning stability of the plasma. It is concluded that, in general, control of the positions of small shear and of high pressure gradients is needed to guarantee MHD stability.

Additional information

Authors: HOLTIES H A, FOM Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);GOEDBLOED J P, FOM Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);HUYSMANS G T A, JET Joint Undertaking, Abingdon, Oxon. (GB);KERNER W O K, JET Joint Undertaking, Abingdon, Oxon. (GB);PARAIL V V, JET Joint Undertaking, Abingdon, Oxon. (GB);SÖLDNER F X, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)06 EN (1995) 15 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199510801 / Last updated on: 1995-07-17
Category: PUBLICATION
Original language: en
Available languages: en