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This report contains two contributed papers on plasma physics. In the first, a microinstability based model of anomalous energy transport is presented, which relies on the effect of the electrostatic modes destabilised by ion temperature gradients and trapped electron dynamics. The threshold for the onset of the instability is determined by the linear analysis of the kinetic dispersion relation. Numerical simulations show good agreement with the experimental results. A possible model for the electron transport at the edge is discussed. A short description of the lower hybrid power deposition code is also given. The second paper deals with the results of an experiment of plasma heating by 8GHz LH waves carried out on the Frascati tokamak, in order to investigate the possibility of heating a high density plasma with LH waves. The coupling of the LH waves to the plasma is very good. A power density as high as 10 KW/cm2 is routinely injected into the plasma. Analysis of electron cyclotron emission spectra shows that faster electrons, corresponding to less accessible values of n, are suppressed more strongly than slower ones as density is increased. Results on accessibility and plasma heating indicate that the inaccessible part of the spectrum contributes effectively to plasma heating.

Additional information

Authors: ENEA, ENEA: Centro Ricerche Energia Frascati (IT)
Bibliographic Reference: Report: RT/FUS/88/9 EN (1988)
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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