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Quasi-linear relaxation of runaway electrons in a HF heated tokamak plasma

Published online by Cambridge University Press:  13 March 2009

R. Klíma  and
V. V. Parail
R. Klíma
Affiliation:
Institute of Plasma Physics, Czechoslovak Academy of Sciences, Nademlýská 600, Prague 9, Czechoslovakia
V. V. Parail
Affiliation:
Institute of Plasma Physics, Czechoslovak Academy of Sciences, Nademlýská 600, Prague 9, Czechoslovakia
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Extract

The theory of quasi-linear diffusion of runaway electrons in the field of electromagnetic waves (HF field) excited by external sources is given. The frequency of the waves is somewhat less than the electron cyclotron frequency. The time-averaged distribution function of resonant electrons is derived. The presence of the toroidal electric field changes the process of quasi-linear relaxation considerably. It also leads to a continuous absorption of energy and momentum from the HF field. On the other hand, the HF field increases the number of high-energy electrons. As a consequence, beam instabilities can arise. A comparison with experimental results is given.

Type
Research Article
Information
Journal of Plasma Physics , Volume 17 , Issue 3 , June 1977 , pp. 543 - 551
Copyright
Copyright © Cambridge University Press 1977

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References

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