Measurements and Modeling of the EC Emission by LH Generated Fast Electrons in JET

Multiple angle ECE observations with the new Oblique ECE diagnostic at JET are used to probe the electron velocity distribution function at multiple electron energies and identify possible non-Maxwellian features. In particular, suprathermal ECE spectra below the second harmonics for selected JET pulses with injected LHCD power have been analysed in the frame of LH power deposition and CD efficiency studies. The comparison between experimental data and simulations from the emission code SPECE gives information about several parameters, including the LHCD deposition region, the characteristics of the electron tail, the fraction of driven current. The sensitivity of the simulated spectra to the parameters has been studied, in order to assess the level of confidence on the values obtained from the best fit.
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EFDC100621 1.91 Mb