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The presence of an ion impurity species in an otherwise pure plasma has two effects on microturbulence: (i) it causes the threshold value of the main ion temperature gradient (for instability of the standard ion temperature gradient mode) to increase; (ii) it provides the opportunity for a new class of modes (ion temperature gradient driven impurity drift-type waves) to become unstable. The first effect (which tends to be the dominant one) is beneficial, while the second is deleterious to energy confinement.

Additional information

Authors: MIGLIUOLO S, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)13 EN (1991) 15 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199210521 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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