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Abstract
It has been observed that the presence of a dense magnetized background plasma can greatly influence the synchrotron emission associated with relativistic electrons. The plasmas studied are produced by electron cyclotron resonance heating in a magnetic mirror geometry. After microwave turnoff, when the background plasma is not present, the usual synchrotron radiation associated with a tenuous distribution of relativistic electrons is observed; during microwave heating when a dense magnetized background plasma is present, the synchrotron intensity may be considerably decreased from the vacuum intensity. The largest decreases are observed at frequencies below the nonrelativistic electron gyrofrequency ωc, in qualitative agreement with the predictions of a test particle model for the synchrotron emission process. The decreases near nωc are due to the absorption of the synchrotron extraordinary mode via cyclotron damping in the finite temperature background plasma. At frequencies above the upper hybrid frequency ωuh(ωuh2 = ωp2+ωc2 the decrease arises because the synchrotron emission occurs into a cutoff mode of the background plasma.
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