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Time-Resolved Imaging of the Plasma Development in a Triggered Vacuum Switch
박웅화,김무상,손윤규,Klaus Frank,이병준,Thilo Ackerman,Marcus Iberler 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.11
Triggered vacuum switches (TVS) are particularly used in pulsed power technology as closing switches for high voltages and high charge transfer. A non-sealed-off prototype was designed with a side-on quartz window to investigate the evolution of the trigger discharge into the main discharge. The image acquisition was done with a fast CCD camera PI-MAX2 from Princeton Instruments. The CCD camera has a maximum exposure time of 2 ns. The electrode configuration of the prototype is a conventional six-rod gap type, a capacitor bank with C = 16.63 μF, which corresponds at 20 kV charging voltage to a total stored charge of 0.3 C or a total energy of 3.3 kJ. The peak current is 88 kA. According to the tremendously highly different light intensities during the trigger and main discharge, the complete discharge is split into three phases: a trigger breakdown phase, an intermediate phase and a main discharge phase. The CCD camera images of the first phase show instabilities of the trigger breakdown, in phase 2 three different discharge modes are observed. After the first current maximum the discharge behavior is reproducible.
Research on a Trigger Device for a High-Performance Triggered Vacuum Switch
Wung-Hoa Park,Hyung Seop Kong,Byung-Joon Lee,Marius Dehmer,Marcus Iberler 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
We have done research to develop a trigger device for a high performance triggered vacuum switch (TVS) with the trigger device of a gas switch (GS). The trigger device is a critical component deciding the characteristics of initial plasma ignition in the TVS and the GS. Furthermore, the lifetime of the TVS is dominantly determined by the trigger device. In principle, the initial plasma generation of the TVS and the GS is explained by surface flashover. However, the structure of the GS trigger electrode is simpler than that of the TVS trigger device. We interested in the simple disc-type shape of the high dielectric ceramic used in the GS trigger device. In general, high dielectric ceramics are hard materials, and they can easily be cracked during machining. The simple disc-type shape is a remarkable advantage in the fabrication of a trigger device without cracks. However, although the GS trigger device has the structural merit, it could not be used in the TVS because the GS is operated at higher pressure than the TVS. In this research, we fabricated the GS trigger device and investigated the characteristics of the igniting plasma at a pressure of 10-6 mbar. In the follow-on research, this trigger device will be inserted into a TVS, and its operation will be investigated. This results of this research should contribute to the understanding of surface flashover in vacuum and lead to improved TVSs and GSs.