磁気駆動型シャンティングアークプラズマからのイオン引き出しとシース近辺の密度の算定

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Ion extraction from a magnetically driven shunting arc plasma and the plasma density at sheath boundary are described in this paper. The plasma density is obtained using current and voltage waveforms of a target which is immersed in the plasma to extract the carbon ions. A 40 mm length carbon rod which has 2 mm in diameter is employed as solid state plasma sources. A large current more than 1 kamps is supplied from charged-up 20 μF capacitor to heat up the carbon rod and to vaporize the rod matirials. The shunting arc plasma generated along the rod surface is driven with Lorenz force and is accelerated tward a muzzle of a plasma launcher which consists of pair of 100 mm-length carbon plates. The 64 mm diameter brass disc is placed at 100 mm apart from carbon rod and is used as the target. The 10 μs width negative pulse bias voltage is applied to the target for the extraction of the carbon ions from the shunting arc plasma. The ion density near the sheath boundary around the target is obtained using two procedures; utilization of the stationary target current to determine the ion current and/or utilization of the target bias voltage waveforms. The ion density is obtained to be 1.1 × 1015 m-3 at 100 μs after the arc ignition using the target current. The density is larger than the density of 5.1 × 1014 m-3 obtained using the waveform of the target voltage. The plasma density is also predicted using a Bohm equation and a momentum conservation equation. The plasma density is 1.6 × 1016 m-3 at 100 μs after the arc ignition. The density decreases with increasing the time from arc ignition.
社団法人電気学会の論文
2006-07-01

磁気駆動型シャンティングアークプラズマからのイオン引き出しとシース近辺の密度の算定

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