Performance optimization of indirectly heated cathode based electron gun by controlling high voltage surface flashover and beam positioning at target plane

Goel, Vanya; Roy, Amitava; Maiti, Namita

doi:10.1016/j.vacuum.2021.110759

Cited by 4 publications

(2 citation statements)

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“…The schematic diagram of simulation model of indirectly heated cathode-based electron gun is shown in figure 1. The detailed structural specifications are reported in [5]. 3-D modelling and design of the different components of electron gun has been carried out.…”

Section: Simulation Model Of Indirectly Heated Cathode-based Electron...mentioning

confidence: 99%

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3-D analysis of electron beam shape at target plane through parametric variation of an indirectly heated cathode-based electron gun

Goel

Roy

Maiti

2023

J. Phys.: Conf. Ser.

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In this paper, a detailed 3-D analysis of the electron beam shape at the target plane of high power (60 kW, 60 kV, 1 A) 2700-bent indirectly heated cathode-based electron gun has been successfully carried out. This work will help analyse individual electron beam trajectories in the actual 3-D plane to ensure optimum electron beam bending and focusing at the target plane. Moreover, due to the presence of an additional electrode in an indirectly heated cathode-based electron gun i.e., a filament which is resistively heated and an indirectly heated solid cathode (heated through electron bombardment), this analysis becomes even more imperative. The work carried out in this paper will ensure better performance, characterization, and optimization of the 2700-bent indirectly heated cathode-based electron gun. Rigorous simulation work has been carried out by performing 3-D electrostatic, electromagnetic, and particle tracking simulations using CST Studio Particle Tracking Module. Adaptive mesh refinement has been utilized to ensure high accuracy of the results obtained. An optimum filament-solid cathode interspacing was found, using strip-shaped filament by providing a higher negative potential to the grid cup. It led to a well-focused 2700-bent electron beam, exhibiting minimum electron beam emittance at the target plane.

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Section: Simulation Model Of Indirectly Heated Cathode-based Electron...mentioning

confidence: 99%

“…Uniform magnetic field was applied by employing Helmholtz coil configuration. For the required 270 0 bent electron beam at the crucible, an optimum Helmholtz coil current of 75 mA was applied to provide bending beam radius of around 198 mm [5].…”

Section: -D Analysis Of Electron Beammentioning

confidence: 99%