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Trajectories of backscattered electrons have been studied, in respect of those electrons that transit through the rf cavity toward the MIG gun. They get reflected before they reach the cathode. On the return journey they can get reflected again from the collector region and thus get trapped. The transit back and forth through the rf cavity is a potential source of parasitic oscillations. An initial...
High power gyrotrons are used for electron cyclotron heating and current drive in tokamak plasmas. These sources operate with typical efficiencies between 35-50%. For gyrotrons producing one megawatt of RF power, at least one megawatt of electron beam power must be dissipated in the collector. To disperse this power over a larger region, a cyclically varying magnetic field sweeps the spent beam axially...
In gyrotrons with depressed collectors, some backscattered electrons go towards the RF cavity. Those reaching the cavity reduce the interaction efficiency and add excess heating load in a sensitive area; others are reflected back due to mirror effect. Mitigating the effects of backscattered electrons is critical for high power gyrotrons such as are needed for fusion research. This study provides a...
The main issues relating to design of depressed collectors for millimeter wave gyrotrons are discussed. A flow diagram is presented and the interlinking steps are outlined. Design studies are given for two kinds of gyrotrons on which severe constraints on the maximum radii of the collectors had been imposed; namely, for a cavity type and a quasioptical gyrotron. A collector efficiency of the order...
An approach to energy recovery from the spent beam of large-orbit gyrotron is outlined that uses a double magnetic cusp arrangement. The first cusp produces a large rotational velocity, while the second cusp unwinds the axis-encircling beam before it proceeds toward depressed collectors. The results of numerical simulations for beam transmission through the two cusps are summarized. An experimental...
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