非平衡 MHD 発電プラズマの壁面損失

抄録

Charged particle losses on wall surfaces in non-equilibrium MHD power generation plasmas are examined numerically, taking account of the effective flux toward the wall and the surface recombination on it. Electron temperature and density in the bulk plasma are found to be decreased owing to the losses, in particular under the conditions of low bulk electron temperature, low seed fraction and narrow generator channel. Input seed fraction can be reduced by possible sticking of seed material to a cold wall, which is attributed to the flux of seed ions toward the wall. The results obtained suggest that the charged particle losses should be taken into account in the estimate of the performance of MHD generators with narrow channels.