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Experimental plasma-edge gradients of electron and ion densities and temperatures in JET during the edge localized mode (ELM)-free H-mode are examined for the presence of transport barrier region inside the magnetic separatrix. High spatial resolution data in electron density is available from a Li-beam diagnostic, and in electron temperature from an edge charge-exchange (ECE) diagnostic. A reciprocating probe provides highly spatially resolved electron density and temperature data in the SOL outside the separatrix. Ion temperatures and densities are measured using an edge charge-exchange diagnostic. A comparison of the electron density gradients in L-mode and H-mode is made. The behaviour of observed widths and gradients of this edge region are compared with each other and with theoretical expectations. By suitable parametrization of the edge data, an electron pressure gradient can be estimated.

Additional information

Authors: BREGER P ET AL, JET Joint Undertaking, Abingdon, Oxon (GB);FLEWIN C, University College London (GB);HAWKES N C, AEA Fusion, Culham Laboratory, Abingdon, Oxon (GB);PIETRZYK Z A, CRPP, Lausanne (CH);PORTE L, Department of Electrical Engineering, UCLA (US)
Bibliographic Reference: Report: JET-P(97)33 EN (1997) 14pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199711642 / Last updated on: 1997-12-09
Original language: en
Available languages: en