Abstract
The microwave radiation from low-density plasmas following ohmic heating discharges in the B-3 stellarator has been studied. The observed spectrum was found to be consistent with a calculated spectrum of synchrotron radiation from runaway electrons accelerated by the applied electric field. The deviation of the radiation frequency from the electron cyclotron frequency is attributed to Doppler shift caused by motion of the emitting electrons along the magnetic field. The maximum observed frequency deviation corresponded, within 10 per cent, to the maximum electron velocity which was kinematically possible, over an electron energy range extending from 25 kilovolts to almost 1 MeV.
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