Abstract
The average kinetic energy, <Ek>, and the density, nh, of hot electrons of plasma produced by ECH (Electron Cyclotron Heating) in the Nagoya Bumpy Torus-1M are deduced from hard X-rays. In the analysis, collisions between hot-electrons and cold bulk electrons are included, which reduce the line-integrated density nh·l by about 25% compared to the case neglecting the collisions. The relativistic cross section for bremsstrahlung and the response function of NaI(Tl) are also taken into account. By these analysis methods, <Ek> and nh as functions of the injected ECH power Po and filling gas pressure pr are obtained, e.g., <Ek>=2 MeV and nh·l=1-4×1012 cm-2 (l∼10 cm) at Po=40 kW and pr=1-8×10-5 Torr.
Published Version
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