Neutralization process of an accelerated compact torus plasma for deep fuelling into a fusion plasma

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New fuelling method using an accelerated compact torus (CT) plasma technique is proposed. Neutralization efficiency of a CT plasma in neutralizer filled with neutral gas is computed by a Monte-Carlo calculation. It is found that higher than 0.5-mTorr gas pressure is needed to generate a complete neutral flow within a 1-m length neutralizer. The electron temperature of the accelerated CT plasma reduces by ionization and excitation collisions between plasma electrons and neutral gas particles. Reduction of the electron temperature, however, never contributes to enhance the neutralization efficiency because of the low recombination rate.