研究目的
Investigating the evolution of plasma distribution and cathode sheath dynamics during current zero transition in a vacuum interrupter using a two-dimensional set of miniature Langmuir probes.
研究成果
The proposed two-dimensional Langmuir probe array allows for the reconstruction of the 2D plasma electron density distribution and its evolution near and just after current zero transition in a single pulse in real-time mode. The expansion velocity of the cathode-plasma sheath was found to be close to 1 mm/μs, and the electron density of the post-arc plasma was below 10^12 cm^-3.
研究不足
The study is limited by the pulse-to-pulse variation in the experiments and the dependence of the results on the presence and location of the anode spot during the arc operation.
1：Experimental Design and Method Selection:
A two-dimensional array of Langmuir probes was used to trace the electron saturation current from the plasma just before and after current zero during the transient recovery voltage rise in a gap with copper-chromium electrodes.
2：Sample Selection and Data Sources:
The study focused on the plasma density distribution and cathode sheath dynamics in a vacuum interrupter.
3：List of Experimental Equipment and Materials:
The probe set consisted of 9 single probes arranged in a 3x3 rectangular array, made of molybdenum wire with a diameter of
4：2 mm. Experimental Procedures and Operational Workflow:
Probes were biased positively to trace the electron saturation current from the plasma. The electron plasma density was calculated from the probe current.
5：Data Analysis Methods:
The electron plasma density was reconstructed from the probe current using a known expression for the electron saturation current density.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
