Modeling of High-Power Fundamental O-mode ECRH Plasmas in the HSX Stellarator

POSTER

Abstract

Hard x-ray and ECE measurements provide evidence of suprathermal electron populations in the HSX stellarator for low density, 100 kW fundamental O-mode ECRH. A five-dimensional Fokker-Planck code, GNET, is used to calculate the deviation from a Maxwellian background distribution via a Monte Carlo technique. Calculated electron distribution functions are presented for low line average density, high-temperature plasmas ($n_e \approx 2\times 10^{18}$~m$^{-3}$, $T_e \approx 1.5$ keV) with low collision frequencies in the heating region. Calculated X-ray bremsstrahlung emission spectra and electron cyclotron emission spectra will be presented for non-Maxwellian electron distribution functions obtained with GNET and compared to measured spectra.

*This work is supported by DOE grant number DE-FG02-93ER54222.

Authors

  • J.W. Radder

    • HSX Plasma Lab, University of Wisconsin, Madison

  • K.M. Likin

    • HSX Plasma Lab, University of Wisconsin, Madison

  • J.N. Talmadge

    • HSX Plasma Lab, University of Wisconsin, Madison

  • D.T. Anderson

    • HSX Plasma Lab, University of Wisconsin, Madison

  • G. Weir

    • HSX Plasma Lab, University of Wisconsin, Madison

  • S. Murakami

    • Department of Nuclear Engineering, Kyoto University, Japan