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Plasma heating by the injection of fast neutral beams is thought to be one of the most promising ways for a fusion reaction. However, high power neutral beam injectors require large vacuum pumping sys...tems for displacing gases used to neutralize fast ions in the neutralizer cell. In order to solve this problem, authors have proposed the gas jet cell in which ions are neutralized by the high density portion of the supersonic jet. For this gas jet cell being practical, it is necessary to develop supersonic diffusers by which at least 90％ of the gases issuing into the cell as a supersonic jet should be recovered. Present paper describes the experimental results on the performances of supersonic diffusers in low density environments. By using the low density wind tunnel, the effect of diffuser shapes on the mass flow recovery rate and the structures of flow fields in the diffusers are clarified. It has also been shown that, by choosing proper diffuser shapes, the requirement of 90％ mass recovery rate could be fulfilled.続きを見る
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