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The velocity distribution of excited atoms in a plasma is shown to be non-thermal. In the neutral beam/plasma interaction zone the distribution may be highly anisotropic in the local plasma rest frame. Outside this zone the distribution, under present-day Tokamak conditions, approximates the thermal distribution of the plasma ions and hence appears to be thermal. These considerations are fundamental to the interpretation of photon diagnostic data on plasma rotation and ion temperature.

Additional information

Authors: CORE W G F, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB);COWERN N, GEC, Hurst Research Centre, Wembley, Middlesex (GB)
Bibliographic Reference: Report: JET-P(89)11 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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