Secondary electron emission characteristics of 3D-printed ceramic insulators with functionally graded lattice structures
Abstract
The presence of a macroscopic interface between ceramic insulators and vacuum inevitably leads to multipactor under high electric fields, which is a significant threat to various electronic and electrical devices, as it is typically regarded as a precursor to electrical breakdown. In this study, we report a strategy using functionally graded lattice structures (FGLS) to manipulate the multipactor of the ceramic surface. First, particle-in-cell simulations were conducted to study the secondary electron avalanche process. Simulation results indicated that the interaction between electrons and FGLS hinders the development of secondary electron avalanche. Also, a few positive charges can be accumulated on the ceramic surface since FGLS eliminates the macroscopic interface between insulators and vacuum. Subsequently, stereolithography 3D printing technology was adopted to fabricate ceramic insulators with FGLS, and a further experimental characterization verifies the reduction of secondary electron yield, especially for surfaces with finer structures.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Chao Wang
Yu-Long Yang
Key Laboratory of Power Electronics and Motion Control of Anhui Higher Education Institutions, Anhui University of Technology 1 , Ma'anshan 243000,
Xin-Ru Shi
Key Laboratory of Power Electronics and Motion Control of Anhui Higher Education Institutions, Anhui University of Technology 1 , Ma'anshan 243000,
Wen-Dong Li
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University 2 , Xi'an, Shaanxi 710049,
Guang-Yu Sun
École Polytechnique Fédérale de Lausanne (EPFL) 2 , Lausanne CH-1025,
Si-Le Chen
Key Laboratory of Power Electronics and Motion Control of Anhui Higher Education Institutions, Anhui University of Technology 1 , Ma'anshan 243000,
Song-Lin Ran
Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education 4 , Ma'anshan 243000,
Guan-Jun Zhang
State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University 1 , Xi'an, Shaanxi 710049,
Zhao-Quan Chen
Key Laboratory of Power Electronics and Motion Control of Anhui Higher Education Institutions, Anhui University of Technology 1 , Ma'anshan 243000,