Using the diluted S1813 UV photoresist as a sacrificial layer, we successfully fabricate a superconducting suspended parallel-plate capacitor, in which the top layer of aluminum film acts as a membrane mechanical reso...Using the diluted S1813 UV photoresist as a sacrificial layer, we successfully fabricate a superconducting suspended parallel-plate capacitor, in which the top layer of aluminum film acts as a membrane mechanical resonator. Together with a superconducting octagonal spiral inductor, this parallel-plate capacitor constitutes a superconducting microwave resonator. At m K temperature, the transmission characteristic and spectrum of the microwave resonator are measured.Sideband frequencies caused by the vibration of the membrane mechanical resonator are clearly demonstrated. By downconverting with a mixer, the dependence of fundamental frequency and its harmonics on the input microwave power are clearly demonstrated, which is consistent with the numerical simulation.展开更多
为提升采用CO2气体作为灭弧介质的高压断路器大电流开断能力,对真空间隙与CO2气体间隙串联开断过程进行研究。通过建立12 k V真空间隙与72.5 k V CO2气体间隙组成的串联间隙电弧黑盒模型,分析两间隙承担暂态恢复电压起始时刻不同时两间...为提升采用CO2气体作为灭弧介质的高压断路器大电流开断能力,对真空间隙与CO2气体间隙串联开断过程进行研究。通过建立12 k V真空间隙与72.5 k V CO2气体间隙组成的串联间隙电弧黑盒模型,分析两间隙承担暂态恢复电压起始时刻不同时两间隙协同作用关系;研究两间隙并联分压电容对间隙间电压分布特性的影响;对比串联间隙与单一气体间隙开断性能的差异。仿真结果表明：真空间隙先承担恢复电压有利于CO2气体间隙介质强度快速恢复,真空间隙提前15～30μs承担恢复电压时串联间隙表现出较好的协同开断效果;两间隙在不同时刻承担恢复电压时设置合适的分压电容可优化间隙间的恢复电压分布特性。CO2气体间隙串联真空间隙后可提升其大电流开断能力,为环保型高压断路器设计提供可借鉴方法。展开更多
To improve the performance of a metal ion plasma jet in vacuum discharge, an anode-insulated cone-cylinder electrode with insulating sleeve is proposed in this paper. Discharge characteristics and generation character...To improve the performance of a metal ion plasma jet in vacuum discharge, an anode-insulated cone-cylinder electrode with insulating sleeve is proposed in this paper. Discharge characteristics and generation characteristics of plasma of the electrode are investigated, effects of diameter of insulating sleeve, variety of cathode material and length of the insulating sleeve on characteristics of metal ion plasma jet are discussed. Results indicate that a directional and steady plasma jet is formed by using the novel electrode with insulating sleeve under high vacuum conditions. Moreover, the properties of metal ion plasma jet are improved by using the aluminum cathode and thin and long insulating sleeve. The study provides strong support for research of vacuum metal ion plasma thruster and ion implantation technology.展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2016YFA0301801)the National Natural Science Foundation of China(Grant Nos.11474154 and 61521001)the Priority Academic Development Program of Jiangsu Higher Education Institutions and Dengfeng Project B of Nanjing University,China
文摘Using the diluted S1813 UV photoresist as a sacrificial layer, we successfully fabricate a superconducting suspended parallel-plate capacitor, in which the top layer of aluminum film acts as a membrane mechanical resonator. Together with a superconducting octagonal spiral inductor, this parallel-plate capacitor constitutes a superconducting microwave resonator. At m K temperature, the transmission characteristic and spectrum of the microwave resonator are measured.Sideband frequencies caused by the vibration of the membrane mechanical resonator are clearly demonstrated. By downconverting with a mixer, the dependence of fundamental frequency and its harmonics on the input microwave power are clearly demonstrated, which is consistent with the numerical simulation.
文摘为提升采用CO2气体作为灭弧介质的高压断路器大电流开断能力,对真空间隙与CO2气体间隙串联开断过程进行研究。通过建立12 k V真空间隙与72.5 k V CO2气体间隙组成的串联间隙电弧黑盒模型,分析两间隙承担暂态恢复电压起始时刻不同时两间隙协同作用关系;研究两间隙并联分压电容对间隙间电压分布特性的影响;对比串联间隙与单一气体间隙开断性能的差异。仿真结果表明：真空间隙先承担恢复电压有利于CO2气体间隙介质强度快速恢复,真空间隙提前15～30μs承担恢复电压时串联间隙表现出较好的协同开断效果;两间隙在不同时刻承担恢复电压时设置合适的分压电容可优化间隙间的恢复电压分布特性。CO2气体间隙串联真空间隙后可提升其大电流开断能力,为环保型高压断路器设计提供可借鉴方法。
基金supported by National Natural Science Foundation of China(No.51577011)
文摘To improve the performance of a metal ion plasma jet in vacuum discharge, an anode-insulated cone-cylinder electrode with insulating sleeve is proposed in this paper. Discharge characteristics and generation characteristics of plasma of the electrode are investigated, effects of diameter of insulating sleeve, variety of cathode material and length of the insulating sleeve on characteristics of metal ion plasma jet are discussed. Results indicate that a directional and steady plasma jet is formed by using the novel electrode with insulating sleeve under high vacuum conditions. Moreover, the properties of metal ion plasma jet are improved by using the aluminum cathode and thin and long insulating sleeve. The study provides strong support for research of vacuum metal ion plasma thruster and ion implantation technology.
