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Measurement of Electron Cyclotron Emission from the Tandem Mirror GAMMA 10

Electron cyclotron emission (ECE) measurements on the tandem mirror GAMMA 10 are reported. The fifth-harmonic ECE in the thermal barrier region was measured in order to obtain the temporal and spatial evolution of hot electrons produced by electron cyclotron resonance heating for the formation of a thermal barrier potential well. The electron temperatures in the central and plug cells were determined using the second-harmonic ECE which was corrected for the hot-electron emission by considering a relativistic shift of resonance layers. The results, thus obtained, show strong evidence for the existence of a thermal barrier.