Abstract
Some properties of a glow discharge tube in a magnetic field as a detector of electromagnetic radiation at millimetre wavelengths were investigated. The dependence of the detected voltage on the magnetic field in the vicinity of the cyclotron resonance was found to be of Lorentzian shape. This shape is also derived theoretically from a suggested model for the electrons in a glow discharge. The detected voltage, noise level, and noise equivalent power (NEP) were measured as a function of discharge current at cyclotron resonance conditions. Up to a discharge current of 600 mu A the noise level was constant and equal to the noise level at zero magnetic field. The detected voltage and NEP had a broad maximum around 400-500 mu A. The flow discharge tube operating at cyclotron resonance conditions was found to be better than the conventional crystal detector (1N53D) with respect to NEP and modulation frequency response.
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