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The density and temperature in a stationary, magnetically stabilized He arc plasma are determined. The axial temperatures measured are between 2°K and 4°K, depending on the discharge current. The electron densities are found to be n e  = 1.5 × 10 16  cm -3 , this value being constant over the arc radius. These measurements yield very steep radial pressure gradients and axial pressures of up to 1 atm. The pressure profiles are dealt with quantitatively. It is shown that the pressure build-up is governed essentially by a thermomagnetic effect familiar in solid state physics, namely the Nernst effect. The theory of this effect readily explains why the electron density is constant over the radius.

Der Druckaufbau in einem stationären, magnetfeldstabilisierten Heliumplasma hoher Dichte und Temperatur