Untersuchung an einem Theta-Pinch-Plasma im Bereich der Plasmafrequenz

Abstract

It is investigated to what extent the radiation of a thetatron plasma near the plasma frequency can be interpreted by means of Bremsstrahlung emission. A new type of infrared scanning system allowing for radial resolution of the plasma radiation around 2.5 THz was designed for this purpose. The radiation intensities measured herewith are compared with the results of a computer program. This program based on an experimentally verified hydromagnetic model gives the time-dependent Bremsstrahlung intensity in a ray optical approximation; supplementary computations have been carried out in wave optical approximations. The results of both calculations are in good agreement with the infrared measurements except for a short radiation peak during the first shock wave phase of the discharge. This peak can be interpreted, however, by means of a semiquantitative evaluation as a two-stream instability-induced radiation burst.