阪大ピンチガンの特性

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A pinched gun of linear type has been investigated as the sourse of high energy plasma jet. The gun employs alow indicctance (18 mμH) power supply and pulsive aamition of gas into vacuum by a fast acting valve mounted on the bottom copper disk electrode. Sufficcently high speed (-108 cm/sec) plasma jet of hydrogen gas has been Obtained when the gas diffusion delay time (t) is short. It was-found that the performance of the plasma gun is closely related to the pinch effect taking place in the gun. The ratio of the plasma speed to the mean pinching speed of the gun depends only on (t) and does not on the total amount of admitted gas. We learned that the meam pinchingspeed follows Rosenbluth's theory and was independent on (t), while it was only the function of average gas density in the gun. For small (t), H is said to be constant about (t) and starting voltage of plasma driving condensers, and decreases suddenly for some critical value of (t) which becomes larger when the starting voltage of the condensers are higher.
社団法人プラズマ・核融合学会の論文