Work

Particle in cell investigation on two multipacting diffusion modes on insulating dielectric surface in vacuum flashover process

Year: 2025

Type: article

Abstract: Vacuum surface flashover is a weak link and bottleneck issue in high-power pulse devices, and secondary electron emission avalanche (SEEA) is one of several physical phenomena required for the development of cathode-initiated flashover. The traditional theory holds that SEEA starts near the cathode triple junction (CTJ), and the high space charge density region spreads along the dielectric surface toward the anode. Xu et al. [Phys. Plasmas 29(11), 113901 (2022)] found in his experiments that the high space charge density region may also spread from the cathode to the anode or from the middle of the gap to both ends, and the physical mechanism behind this phenomenon is well worth exploring. The paper adopts the particle-in-cell simulation method to study the dynamic behavior of electrons after emission from the triple junction. The simulation reveals that when explosive emission occurs at the CTJ, a high-density electron region appears at a position far from the CTJ and spreads toward the electrode along the dielectric surface. This phenomenon is investigated through a combination of numerical simulation and theoretical analysis in the study.

Source: Journal of Applied Physics

DOI: 10.1063/5.0275587

Authors: Laqun Liu, Feng Li, Ye Dong

Institutions: University of Electronic Science and Technology of China, China Academy of Engineering Physics, Institute of Fluid Physics, Institute of Applied Physics and Computational Mathematics

Language: English

Topic: Pulsed Power Technology Applications

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funder: National Natural Science Foundation of China