Accession Number : ADA638711


Title :   Picosecond High Pressure Gas Switch Experiment


Descriptive Note : Conference paper


Corporate Author : LAWRENCE LIVERMORE NATIONAL LAB CA


Personal Author(s) : Cravey, W R ; Freytag, E K ; Goerz, D A ; Poulsen, P ; Pincosy, P A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a638711.pdf


Report Date : Jun 1993


Pagination or Media Count : 6


Abstract : A High Pressure Gas Switch has been developed and tested at LLNL. Risetimes on the order of 200 picoseconds have been observed at 1 kHz prf and 1 atmosphere pressures. Calculations show that switching closure times on the order of tens of picoseconds can be achieved at higher pressures and electric fields. A voltage hold-off of 1 MV /em has been measured at 10 atmospheres and several MV /em appears possible with the HPGS. With such high electric field levels, energy storage of tens of Joules in a reasonably sized package is achievable. Initial HPGS performance has been characterized using the WASP 1 pulse generator at LLNL. A detailed description of the switch used for initial testing is given. Switch recovery times of 1-ms have been measured at 1 atmosphere. Data on the switching uniformity, voltage hold-off recovery, and pulse repeatability, is presented. In addition, a physics switch model is described and results are compared with experimental data. Modifications made to the WASP HV pulser in order to drive the HPGS will also be discussed. Recovery times of less than I ms were recorded without gas flow in the switch chambers. Low pressure synthetic air was used as the switch dielectric. Longer recovery times were required when it was necessary to over-voltage the switch.


Descriptors :   *HIGH PRESSURE , *SWITCHES , DIELECTRICS , ELECTRIC FIELDS , ENERGY STORAGE , GAS FLOW , LOW PRESSURE , PERFORMANCE(ENGINEERING) , PULSE GENERATORS , RECOVERY , REPETITION RATE , SPARK GAPS , SWITCHING , VOLTAGE


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE