Elektronendichteverlauf in magnetisierten Wasserstoffb�gen bei Abweichung der Ionentemperatur von der Elektronentemperatur

Abstract

Electron Density Distribution in Magnetized Hydrogen Arc Plasmas with the Ion Temperature Deviating from the Electron TemperatureThe radial distribution of the electron density ne(r ) (ne=approx. 1016 cm 3) in hydrogen arc plasmas in a strong axial magnetic field is determined by measuring the rotation of the polarization plane of linearly polarized light (Faraday effect). As expected, it is found that the electron density decreases towards the discharge axis, i.e. with increasing temperature, but again rises near the axis. This increase is due to a thermomagnetic effect, the Nernst effect, in cases where the ion temperature is much lower than the electron temperature.

On the Pressure Balance and Plasma Transport in Cylindrical Magnetized Arcs

“…1 a II as used in [7,8], we would find again a positive rotation of the cathode side and negative rotation at the anode side. But now the negative rotation at anode side is much more extended and a neutral rotation point is expected to occur roughly halfway anode-cathode.…”

“…Especially, if E r < 0, positive rotation, rotational confinement may even dominate the pressure enhancement. Therefore, in our view it is not sufficient to test the Nernst-effect with the measured overall pressure enhancement [6,7]; it is a much better test, to check the Nernst form of the (n e ,T e ) relation i.e. n e T~t 1/4 = Ct. for Z;=l as a function of radius.…”