Statistics – Computation
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..365k&link_type=abstract
The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 365-368 (199
Statistics
Computation
Plasma Heating By Particle Beams, Tokamaks, Spherical Tokamaks, Theory, Design, And Computerized Simulation
Scientific paper
A parallel solver of the Fokker-Planck equation, coupled with a set of parallel interpretative codes (computing the Electron Cyclotron Emission, X-Ray Emission, and Thomson Scattering spectra for an arbitrary electron distribution function), was written. The code allows the computation of the electron distribution function at much higher resolution in phase-space than it was previously possible. We find this capability to be crucial when simulating ECH in high-performance plasmas. In such plasmas and for normal heating, strong wave damping causes the RF power to be absorbed by the bulk of the distribution function, with negligible production of suprathermal electrons. Strong bulk absorption, however, is associated with the appearance of a new phenomenon: the deformation of the electron distribution at thermal energies. For power deposition near the plasma center, this effect results in the apparent peaking of the central electron temperature (in addition to the temperature increase), and in the discrepancy among the values of the electron temperature measured by different diagnostics (ECE, XRE, TS), reflecting the different energy-range sensitivity of the diagnostics, and the strong energy-dependence of the slope of the bulk distribution function. The deformation of the bulk distribution is governed by a power-density threshold, and increases with the electron temperature.
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