Abstract

AbstractA thermal Cs‐plasma was produced by contact ionization at the surface of a hot tungsten helix spanned in the axis of a cylindrical glass vessel. The plasma density profile n (r, z) as function of a magnetic field in z‐direction was measured with a movable Langmuir‐probe and compared to the calculated profiles.In the present 1st part n (r, z) is calculated from the diffusion equation. In the calculations collisions of the carriers with the neutrals as well as Coulomb collisions are taken into account. This leads to a nonlinear partial boundary value problem. Methods for numerical solution and numerical solutions are given.

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