Range and similarity of hollow cathode discharge in argon

Hou, Xinyu; Zou, Xiaobing; Li, Yutai; Zhang, Lunwei; Wang, Xinxin

doi:10.1049/hve.2019.0090

Cited by 3 publications

(1 citation statement)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface discharge, compared with other discharge forms, preferentially occurs along the dielectric surface when an intense voltage is applied on the solid‐bridging vacuum gap, usually called vacuum flashover [1, 2]. The solid‐vacuum interface has long been assumed as the weakest point in the vacuum insulation system, compared with the pure vacuum gap and the dielectric bulk.…”

Section: Introductionmentioning

confidence: 99%

Modelling vacuum flashover mitigation with complex surface microstructure: mechanism and application

Zhang

Sun

et al. 2020

High Voltage

View full text Add to dashboard Cite

The vacuum discharge along the dielectric surface, also called surface flashover, brings significant damages to the vacuum-solid insulation system. Here the authors implement shape-flexible, complex surface groove microstructures on the dielectric to mitigate the initiation of vacuum flashover. A particle-in-cell simulation is employed to reveal the real-time discharge development considering the blockage of the multipactor propagation as well as the space field distortion in the presence of specific surface microstructures. Electron trajectories within barriers are theoretically analysed to present how the barrier shape affects the discharge process, showing consistent results with the simulation. By analysing three parameters, namely the anode current, the surface average charge density and the flashover threshold, it is found that the effect of suppressing surface flashover remarkably augments when the groove number and depth rise up, while such effect gradually saturates when the groove depth reaches a critical value. Theoretical analyses are also provided for the decay factor as well as the optimal shape and trapezoid grooves are proved as the optimal shape distribution of microstructures. Furthermore, different secondary emission yield (SEY) distributions are considered with two kinds of structures, including the material with low-SEY inside and on the top surface of grooves.

show abstract

Section: Introductionmentioning

confidence: 99%

Modelling vacuum flashover mitigation with complex surface microstructure: mechanism and application

Zhang

Sun

et al. 2020

High Voltage

View full text Add to dashboard Cite

show abstract

High-Voltage Nanosecond Pulse Generator Based on Two-Stage Blumlein Transmission Line

Luo¹,

Zhao²,

Li³

2023

Lecture Notes in Electrical Engineering

View full text Add to dashboard Cite

Simulation of hollow cathode discharge in oxygen

Zhao¹,

Ha²,

Wang³

et al. 2022

Acta Phys. Sin.

View full text Add to dashboard Cite

The characteristics, the formations and loss mechanisms of different particles of hollow cathode discharge in oxygen at 266 Pa are investigated by using the fluid model. The model contains 11 kinds of particles and 48 reactions. Under this simulation condition, the negative glow regions corresponding to the surrounding cathodes overlap. The results show that there is a strong hollow cathode effect. The density distributions of different charged and active particles are calculated. The charged particle density is located mainly in the central region of the discharge cell. Electrons and O– are the main ingredients of negative charges in the discharge system, and their density peaks are 5.0 × 1011 cm–3 and 1.6 × 1011 cm–3, respectively and <inline-formula><tex-math id="Z-20220109205735">\begin{document}${\rm{O}}_2^+ $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="2-20211150_Z-20220109205735.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="2-20211150_Z-20220109205735.png"/></alternatives></inline-formula> is a main composition of positive charge in the discharge system with a peak density of 6.5 × 1011 cm–3. Abundant active oxygen particles exist in the discharge system, and their density is much higher than those of other charged particles. According to the densities of active particles, their magnitudes are ranked in the small-to-large order as O, O2(a1Δg), O(1D) and O3. Furthermore, the generation and consumption mechanism of electrons, O– and <inline-formula><tex-math id="Z-20220109205753">\begin{document}${\rm{O}}_2^+ $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="2-20211150_Z-20220109205753.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="2-20211150_Z-20220109205753.png"/></alternatives></inline-formula> are calculated in detail, and the generation and consumption paths of different active oxygen particles are also given. The results show that there is a complex coupling process among these particles. Each reaction generates a certain number of particles and consumes other particles at the same time, resulting in a dynamic balance among these particles.

show abstract

Range and similarity of hollow cathode discharge in argon

Cited by 3 publications

References 30 publications

Modelling vacuum flashover mitigation with complex surface microstructure: mechanism and application

Modelling vacuum flashover mitigation with complex surface microstructure: mechanism and application

High-Voltage Nanosecond Pulse Generator Based on Two-Stage Blumlein Transmission Line

Simulation of hollow cathode discharge in oxygen

Contact Info

Product

Resources

About