High voltage, sub nanosecond feedthrough design for liquid breakdown studies

Michael Cevallos, James Dickens, Andreas Neuber, Herman Krompholz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Experiments in self-breakdown mode and pulsed breakdown at high over-voltages in standard electrode geometries are performed for liquids to gain a better understanding of their fundamental breakdown physics. Different liquids of interest include liquids such as super-cooled liquid nitrogen, oils, glycerols and water. A typical setup employs a discharge chamber with a cable discharge into a coaxial system with axial discharge, and a load line to simulate a matched terminating impedance, thus providing a sub-nanosecond response. This study is focused on the feed-through design of the coaxial cable into this type of discharge chamber, with the feed-through being the critical element with respect to maximum hold-off voltage. Diverse feedthroughs were designed and simulated using Maxwell 3-D Field Simulator Version 5. Several geometrically shaped feed-through transitions were simulated, including linearly and exponentially tapered, to minimize electrostatic fields, thus ensuring that the discharge occurs in the volume of interest and not between the inner and outer conductor at the transition from the insulation of the coaxial cable to the liquid. All feedthroughs are designed to match the incoming impedance of the coaxial cable. The size of the feedthroughs will vary from liquid to liquid in order to match the coaxial cable impedance of 50Ω. The discharge chamber has two main ports where the feed-through will enter the chamber. Each feed-through is built through a flange that covers the two main ports. This allows the use of the same discharge chamber for various liquids by changing the flanges on the main ports to match the particular liquid. The feedthroughs were designed and built to withstand voltages of up to 200 kV. The feedthroughs are also fitted with transmission line type current sensors and capacitive voltage dividers with fast amplifiers/attenuators in order to attain a complete range of information from amplitudes of 0.1mA to 1 kA with a temporal resolution of 300 ps.

Original languageEnglish
Title of host publicationBEAMS 2002 - 14th International Conference on High-Power Particle Beams
PublisherIEEE Computer Society
Pages73-76
Number of pages4
ISBN (Print)9780735401075
DOIs
StatePublished - 2002
Event14th International Conference on High-Power Particle Beams, BEAMS 2002 and the 5th International Conference on Dense Z-Pinches, DZP 2002 - Albuquerque, NM, United States
Duration: Jun 23 2002Jun 28 2002

Publication series

NameBEAMS 2002 - 14th International Conference on High-Power Particle Beams
Volume1

Conference

Conference14th International Conference on High-Power Particle Beams, BEAMS 2002 and the 5th International Conference on Dense Z-Pinches, DZP 2002
CountryUnited States
CityAlbuquerque, NM
Period06/23/0206/28/02

Fingerprint Dive into the research topics of 'High voltage, sub nanosecond feedthrough design for liquid breakdown studies'. Together they form a unique fingerprint.

Cite this