Axial Behavior and End Loss of Plasma in a Slow Theta Pinch

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概要

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• The dynamic behavior of a helium plasma produced in a magnetic mirror field by a coil with large length and diameter was investigated with high speed cameras and by spectroscopic observations. The produced plasma is unstable at the initial pressure above 50 mTorr, but is rather stable and drift-free at pressures below 25 mTorr. The plasma contracts axially to the midplane. The velocity of contraction is faster at higher pressures. After the maximum contraction the plasma expands to the mirror plane with a velocity of about 2 × 10^6cm/sec nearly independent of the initial pressure. During the expansion, the plasma decreases at the midplane and increases at the mirror plane. In the case of the drift-free plasma, the e-folding times of decreasing plasma at the midplane are 10〜20μsec increasing with decreasing initial pressure. These results show that the end loss of dense plasma from the mirror field is affected by a non-steady axial plasma motion which seems to originate in the axially inhomogeneous distribution of the produced plasma.

• 社団法人日本物理学会の論文
• 1967-10-05

著者

• Shiina Shoichi

  Department Of Physics And Atomic Energy Research Institute College Of Science And Engineering Nihon

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• Axial Behavior of a Plasma in the Slow Theta Pinch

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