Theorie der stoßfreien Plasmasäule unter Berücksichtigung des Wandverlustes

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Abstract
The collision-free plasma column has been investigated without a magnetic field in the normal and subnormal region neglecting wall losses. This neglection simplifies the analysis appreciably since it allows to describe the electrons by a BOLTZMANN distribution. However, in the subnormal region and in strong magnetic fields the wall loss is a decisive factor. Therefore our investigation extends the theory including this effect. Starting from the transport equations particle density and potential distributions as well as the current-voltage characteristic are found by numerical integration. With increasing magnetic field the particle density profiles grow wider whereas the potential distribution grows flatter. These effects are particularly pronounced in the subnormal region. In this region the I/V-characteristic shows a negative slope, which for a given current decreases with increasing magnetic field.

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