Design of master oscillator for frequency locking of a complex of megawatt level microwave sources

Abstract

We present the results of the development of a highly stable gyrotron (with long‐term stability of an operating frequency of 170 GHz being equal to 10−9) for experiments on frequency locking and control of megawatt power sources. The electron‐optical and electrodynamic systems of the gyrotron are calculated and optimized, including the magnetron‐injection gun, interaction space, collector, and quasioptical converter of radiation into a Gaussian wave beam. Main requirements for such systems are described along with their specific features, which allow one to develop a relatively simple, low cost, and reliable master generator for synchronization of a large number of continuous‐wave megawatt gyrotrons. This reveals new possibilities for creation of gyrotron complexes capable of generation coherent radiation of nearly unlimited power levels.

Russian Gyrotrons: Achievements and Trends

“…Recent theoretical works [58]- [61] show that this approach makes it technically possible to increase the power of megawatt devices by about 2 times and efficiency by 1.5 times. For experimental test of this goal a stabilized 30 kW / 170 GHz gyrotron-driver has been developed at IAP RAS [62] and principal tests to be carry out at the beginning of 2021.…”

Concept design of the megawatt power level gyrotron stabilized by a low-power signal for DEMO project

“…Following this way, to make the next step in CF design, it is necessary to solve two problems: create the new high-stable master oscillator and develop the new powerful gyrotron, both with the frequency close to 230 GHz. The first task now seems to be not difficult due to the recent experience in some previous works, such as developing a master-oscillator with frequency f = 170 GHz [9] and proof-of-principal experiment with precise frequency stabilization in the gyrotron with operation frequency f = 250 GHz [10]. At the same time, increasing the gyrotron frequency from 170 to 230 GHz in DEMO project while keeping its output power faced some new problems, which were not so critical in the previous gyrotrons for ITER.…”