1998年6月30日 · Experiments have investigated the behavior of explosive emission cathode gyrotrons using cylindrically symmetric coaxial diodes with centrally located knife-edged cathode and conical anode.

The cathode coil is installed on the Gyrotron below the cryomagnet in between cathode and cavity. The effect of cathode coil is observed gradually by varying the current from 0.5 to 2.0 A. As a results, the effect of uncontrolled growth of beam current was not observed and beam voltage can be increased safely up to 50 kV which is a required ...

The temperature-limited cathode current has important implications for operating a gyrotron. Rapid changes in beam current are not possible because the thermal time constant for changing cathode temperature is of the order of 30 sec to 1 min. Rapid changes in the gyrotron output power can be realized by rapid changes in beam voltage. The change in

Abstract—The gyrotron is the high power millimeter wave source in the electron cyclotron resonance heating system for the tokamak. The cathode power supply is one of the most important ancillary devices for gyrotron. Some interesting transient phenomena about the cathode voltage and the cathode current

Lanthanum hexaboride (LaB6) cathodes are also extensively used in a practical gyrotron (discussed in Chap. 2). To achieve electron emission, thermionic emitters are heated at high temperatures (> 1000 °C) through an indirect technique to isolate the rest tube from the applied potential across the filament.

2017年3月2日 · The cathode power supply is one of the most important ancillary devices for gyrotron. Some interesting transient phenomena about the cathode voltage and the cathode current was found in the gyrotron operation in the electron cyclotron resonance heating system for the Experimental Advanced Superconducting Tokamak.

Three-dimensional trajectory analysis can be complicated in a system whose cathode surface has inhomogeneities of similar size. As gyrotron EOSs are typically hundreds of millimeters long, a mesh accounting for such a cathode has a large number of cells, which is unacceptable for modern computational systems.

Simulations show that some ions generated within the gyrotron will bombard back to the cathode surface which may leads to degradation of the cathode as well as the gyrotron electron gun. for that the electron beam will be more dispersed compared with the original state, with the velocity dispersion increased by about 36% in this simulation.

Active methods of frequency stabilization in gyrotrons utilize automated control of the electron beam parameters by variation of the guiding magnetic field, accelerating (cathode) voltage, and modulating (anode) voltage.

These gyrotrons were purchased from GYCOM-NN, Russia, who also was responsible for the design. They operate with a Diode-Magnetron-Injection (MIG) electron gun with a lanthanum hexaboride (LaB6) cathode emitter.