Numerical Simulation of MIG for 42 GHz, 200 kW Gyrotron

Abstract

A triode type magnetron injection gun (MIG) of a 42 GHz, 200 kW gyrotron for an Indian TOKAMAK system is designed by using the commercially available code EGUN. The operating voltages of the modulating anode and the accelerating anode are 29 kV and 65 kV respectively. The operating mode of the gyrotron is TE 03 and it is operated in fundamental harmonic. The simulated results of MIG obtained with the EGUN code are validated with another trajectory code TRAK.

Numerical Simulation of a Double-anode Magnetron Injection Gun for 110 GHz, 1 MW Gyrotron

“…The numerical calculations have been performed with 32 beamlets. In general, the results of EGUN and TRAK agree very well [14]. The electron beam parameters have been evaluated by the in-house developed code MIGANS.…”

“…To reduce the space charge influence, ϕ (angle between the emitter surface and the magnetic field line) should be greater than 25°. In this case the laminar beam is formed and, therefore, the velocity spread growth with beam current is reduced [6][7][8]14]. Figure 2 shows the laminar beam profile near the cathode.…”

“…have been obtained from the analytical trade-off equations [9][10][11]. The commercially available code EGUN [12] and the in-house developed code MIGANS [13,14] have been used for the design optimization of the MIG. MIGANS is basically a post processor of the EGUN code and is used to find out the different electron beam parameters like a ¼ b ?…”

Design of 95 GHz, 2 MW Gyrotron for Communication and Security Applications

“…are obtained from the analytical trade-off equations [20,21]. The commercially available code EGUN [22] and the in-house developed code MIGSYN and MIGANS [23] are used for the design optimization of the MIG. MIGANS is basically a post processor of the EGUN code and is used to find out the different electron beam parameters like beam velocity ratio, the average transverse velocity spread, the larmor radius (r l ), etc.…”

Simulation of Filament Heater for Uniform Emission from Dispenser Cathode

“…The estimation of cathode dimension and its specification are decided from MIG design using EGUN code [13]. In addition to MIG design, trade-off expression, necessity and technological limits are used to estimate the geometry and material of the filament heater, cathode upper support, cathode lower support and potting material [12][13][14]. Based on above appraisal, initial design of toroid type filament heater is carried out using 3D ANSYS software [15].…”