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The energy confinement properties of low density high ion temperature L and H mode plasmas are investigated. It is shown for L mode plasmas that, although the global confinement is independent of density, the energy confinement in the central region is significantly better at low densities that at higher densities. The improved confinement appears to be associated with the steepness of the density gradient; the possibility that ion temperature gradient instabilities may be playing a role is discussed. For the H-mode phase, although the edge confinement is dramatically improved, which is once again associated with the steep density gradient in the edge region, the central confinement properties are essentially the same as for the standard L-mode.

Additional information

Authors: BALET B, JET Joint Undertaking, Abingdon, Oxon. (GB);BOYD D, University of Maryland, Maryland (US);WEISEN H ET AL., CRPP, EPFL, Lausanne (CH)
Bibliographic Reference: Report: JET-P(89)81 EN (1990) 21pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199010998 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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