Abstract
The first results from the Mk-6 Strathclyde University electron cyclotron maser are presented. The maser is based upon a lightweight two-electrode system making use of a field-immersed, field-emission cold cathode with conventional pulsed coils producing the required spatially homogeneous magnetic field. The maser was operated in the W band (75-110 GHz) and single-mode oscillation in the TE03 mode was observed. This had a centre frequency of 96 GHz and developed up to 100 kW in a 400 ns pulse. Multimode oscillation was subsequently observed, on tuning the intracavity B field with the simultaneous excitation of the TE13 mode (centred at 81 GHz) and the TE42 mode (centred at 88 GHz).
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