Erlangen 2018 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Pulsed Power - Laser-Beam Matter Interaction
K 4.1: Hauptvortrag
Mittwoch, 7. März 2018, 14:00–14:30, MB HS
Experimental Results from the Development of a Triggered Vacuum Switch (TVS) at the Pohang Accelerator Laboratory (PAL) — •Klaus Frank1, Wung Hoa Park2, Suk Ho An2, and Byung Joon Lee2 — 1Physics Department University of Erlangen Nuremberg, Erlangen,Germany — 2Pohang Accelerator Laboratory, Pohang, South Korea
The TVS is an extremely robust devices that can survive over-voltage, overcurrent, and reverse-current faults. At the Pohang Accelerator Laboratory in 2015 started the development of a non-sealed-off TVS prototype. The experimental set-up consists of the 6 * rod prototype TVS switch, a charging circuit with a capacitor bank with C = 16.63 µF, which has at 20 kV charging voltage a total stored charge of 0.3 C or a total energy of 3.3 kJ. The peak current Ip is 88 kA. Introductorily a short review of the history of TVS development is given. For better understanding of triggering and breakdown the basic model of TVS breakdown is briefly described. Usually the trigger unit is at an elevated position with regard to the cathode surface. Therefore it is inevitably exposed to metal vapor deposition from the main discharge plasma. At PAL a second position of the trigger unit was studied. The trigger unit is positioned in a recess of the cathode. Lifetime comparisons of both trigger positions are presented. In parallel, the metallic layer deposition on the ceramic disc of the trigger is investigated by several methods of thickness analysis. Finally an outlook for future experiments is given.