Measurement of frequency shift in a gyrotron oscillator

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Abstract
A ballistic model of the interaction mechanism in gyrotron amplifiers and oscillators has been discussed in prior communications. It is the objective of the present contribution to support such purely theoretical investigations with some experimental evidence. In this connection it has been decided to measure the output frequency of a gyrotron oscillator and note its shift from the resonance frequency of the cavity when ‘cold’. According to the ballistic interaction model the frequency shift is a function of the beam current, the anode voltage and the axial magnetic field. It is shown that, except for a single parameter which depends on the exact value of the electromagnetic energy stored in the cavity, reasonable agreement can be achieved between theoretical predictions and the corresponding experimental results. A single-cavity gyrotron oscillator operating in a TE02 mode has been used in the investigations.

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