Abstract
Abstract The change in oscillating characteristics of a tunable (20-100GHz) gyrotron was studied with the change of cavity wall material, all other dimensions and operating parameters remaining constant. The gyrotron was based on a two-electrode electron gun consisting of a field emission, field-immersed cold cathode and a shaped anode cavity. The construction material of the cavity was changed from stainless-steel (σ=l-39×106Q−1m−1) to oxygen-free, high conductivity (OFHC) copper (σ= 5.92×107 Ω −1m−1with an associated 6-5-fold increase in the cavity ohmic quality factor for all modes. It was possible to determine, by measuring the relative millimetre wave output power and pulse duration, the optimum anode-cathode separation. This experimentally determined that the relativistic electron beam production was unaltered with the change in cavity construction material. The maser was operated with an anode-cathode separation of 15 cm and millimetre wave pulse duration of 150 ns at an intra-cavity B field of 10T...
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