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A detailed analysis is presented of experimental data on the energy content in the fast electron population created by lower hybrid waves in the ASDEX tokamak. It is shown that in most circumstances direct losses due to diffusion of these electrons can be neglected. The value of the diffusion coefficient of fast electrons is inferred from the time behaviour of hard X-ray emission during power modulation experiments. It is shown that fast electrons are better confined than the thermal ones. This experimental result is compared with prediction of theories based on transport driven by electrostatic or magnetic turbulence.

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Authors: BARTIROMO R ET AL., ENEA, Centro Ricerche Energia Frascati, Roma (IT);LEUTERER F ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: RT/NUCL/92/35 EN (1993) 24 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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