Experiments on the Negative Radiation Temperature at Cyclotron Resonance in Cold Plasma

概要

論文の詳細を見る
The anomalous microwave radiation from a plasma in a magnetic field was observed. The intensity was extremely large compared with that of blackbody and amounted to the power radiated from the plasma in the thermal equilibrium equivalent to 5.5 × 10^6°K in the case of Kr and 1.5 × 10^6°K in Xe. This radiation occurred very sharply at the cyclotron field, the width being one order smaller than that of normal cyclotron radiation. The radiation was observed in Xe, Kr and Ar plasmas in the pressure range of p=1×10^<-1> ∿ 5mm Hg, but not in Ne and He plasmas at any pressure. Further, the radiation was observed when the whole tube was placed in a longitudinal magnetic field, but not when a part of the positive column was immersed in the field. On the other hand, the theoretical condition for a negative temperature at the cyclotron resonance in a weakly ionized gas was investigated. Then it was discussed whether this anomalous radiation could be interpreted as a phenomenon of the negative radiation temperature.
核融合科学研究所の論文