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Analysis of Hard X-Ray Continuum from Hot Electrons in Nagoya Bumpy Torus

The average kinetic energy, , 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,  and nh as functions of the injected ECH power Po and filling gas pressure pr are obtained, e.g., =2 MeV and nh·l=1-4×1012 cm-2 (l∼10 cm) at Po=40 kW and pr=1-8×10-5 Torr.