In this paper, the results of observation of electron cyclotron emission in CT-6B TOKAMAK device plasma is presented. The ECE was detected by using PME radiometer which can work at fundamental (35GHz) mixing or second harmonic (70GHz) mixing. It was obtained that when the device discharged under low runaway condition, the received signal emission at second harmonic mixing showed that it was the thermal emission associated with electron temperature; while under runaway condition, the receiving of emission at fundamental mixing showed that it was the nonthermal emission of the runaway electrons.
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