Numerical simulation of beam current control mechanism in the thermionic electron gun

Fan, Jikang; Peng, Yong; Xu, Junqiang; Xu, Huining; Yang, Dezhi; Li, Xiaopeng; Zhou, Qi

doi:10.1016/j.vacuum.2019.03.040

Cited by 15 publications

(2 citation statements)

References 24 publications

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“…It was attached on the back-end plate of a cylindricalshape ion source chamber. The electron gun was assembled with a W-filament electron emission cathode, Wehnelt cylinder, extraction electrodes and chassis [7]. The cathode was a spring-shape filament made of a 0.2 mm diameter tungsten wire.…”

Section: Methodsmentioning

confidence: 99%

Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun

Matsumoto

Nakano

Kisaki

et al. 2022

J. Phys.: Conf. Ser.

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Electron behaviour inside a low-energy electron gun based on a spring-shape filament were studied with experiment and Particle-In-Cell simulation. The energy range of the electron beam which we expected was from 1 to 20 eV. The analysis told that smaller size of filament is more useful to improve electron density in front of an extraction hole in the gun to enhance beam current. Relation between a space potential distribution in the gun and electron transport was also studied. A heater voltage to drive a filament for thermionic electron emissions has another role to form a spatial potential distribution in the gun. The potential guides electrons, which are at a distant area from the beam extraction hole, toward the hole. It can be a significant help to realize efficient electron extraction by a beam extraction electric field induced near the hole.

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Section: Methodsmentioning

confidence: 99%

Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun

Matsumoto

Nakano

Kisaki

et al. 2022

J. Phys.: Conf. Ser.

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show abstract

“…[8] Up to now, the most common thermionic material in emissive probes is tungsten filaments, which are also widely used in various electronic devices and systems such as vacuum tubes and electron guns. [9,10] However, the operating temperature of a tungsten filament is usually above 2200 K, and a tungsten filament in an incandescent state is always accompanied by intense evaporation loss. [11] As a result, the tungsten filament becomes thinner and thinner and its service life becomes shorter and shorter, which can inevitably affect the measurement results of plasma potential using a tungsten emissive probe.…”

Section: Introductionmentioning

confidence: 99%

Plasma potential measurements using an emissive probe made of oxide cathode

Li 李,

Ma 马,

Lu 陆

2024

Chinese Phys. B

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A novel emissive probe consisting of an oxide cathode coating is developed to achieve the low operating temperature and long service life of the emissive probe. Compared with the traditional tungsten emissive probe, the properties of the novel emissive probe are investigated in detail, including the operating temperature, the electron emission capability and the plasma potential measurement. Studies of the operating temperature and the electron emission capability show that the tungsten emissive probe usually works at a temperature of 1800-2200 K, while the oxide cathode emissive probe can function at about 1200-1400 K. In addition, the plasma potential measurements using the oxide cathode emissive probe with different techniques have also been accomplished in MW-ECR plasmas with different discharge powers. It is found that the reliable plasma potential can be obtained by using the improved inflection point (IIP) method and the hot probe with zero emission limit (HP-ZEL) method, while the floating point (FP) method is invalid for the oxide cathode emissive probe.

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Influence of the cathode position on beam current characteristics in the thermionic electron gun

Fan

Zhang

et al. 2022

Radiat Detect Technol Methods

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Numerical simulation of beam current control mechanism in the thermionic electron gun

Cited by 15 publications

References 24 publications

Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun

Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun

Plasma potential measurements using an emissive probe made of oxide cathode

Influence of the cathode position on beam current characteristics in the thermionic electron gun

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