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Abstract

Using the CQL3D Fokker-Planck code with radial transport, modelling of hard X-ray spectra of a TCV plasma different from that previously analysed has been made. By comparing different velocity dependencies of the radial diffusion coefficient in the code no strong support in favour of electrostatic or electromagnetic turbulence was found. The electromagnetic turbulence model reproduces well the photon temperature but underestimates to photon count rates by an order of magnitude. In addition, a transport model with different diffusion levels for low and high energy electrons is introduced in order to stimulate the thermal electron transport barrier in the TCV tokamak. Results with this transport model agree fairly well with the experimental hard X-ray spectra.

Additional information

Authors: NIKKOLA P, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);CODA S, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);HARVEY R W, CompX, Del Mar (US)
Bibliographic Reference: A paper presented at the Joint Varenna-Lausanne International Workshop on "Theory of Fusion Plasmas", Varenna, Italy, August 27-30 2002, and published in EPFL Internal report 737/02, October 2002, pp.39-44.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747 Available online on the workshop website: http://varenna-lausanne.epfl.ch/
Record Number: 200215544 / Last updated on: 2002-11-20
Category: PUBLICATION
Original language: en
Available languages: en