NDLI: Operation of parallel rail-gap switches in a high-current, low-inductance crowbar switch

Content Provider	IEEE Xplore Digital Library
Author	Grabowski, C. Degnan, J.H. Domonkos, M. Ruden, E.L. Parker, J. Camacho, J.F. McCullough, J. Sommars, W. Wurden, G.A. Weber, T.E.
Copyright Year	2015
Description	Author affiliation: Directed Energy Directorate, Air Force Res. Lab., Kirtland AFB, NM, USA (Grabowski, C.; Degnan, J.H.; Domonkos, M.; Ruden, E.L.) \|\| Los Alamos Nat. Lab., Los Alamos, NM, USA (Wurden, G.A.; Weber, T.E.) \|\| Leidos, Inc., Albuquerque, NM, USA (Parker, J.; Camacho, J.F.; McCullough, J.; Sommars, W.)
Abstract	The Field-Reversed Configuration Heating Experiment (FRCHX) was designed to form closed-field-line magnetized target plasmas for magneto-inertial fusion and other high energy density plasma research. These plasmas are in a field-reversed configuration (FRC) and are formed via a reversed-field theta pinch on an already-magnetized background plasma. To extend the duration and uniformity of the pinch, the capacitor bank driving the reversed-field discharge is crowbarred near the current peak. Four parallel rail-gap switches are used on FRCHX for this application to ensure a low-inductance crowbar discharge path and to accommodate the large magnitude of the discharge current (often greater than 1 MA). Parallel operation of spark gap switches in a crowbarring arrangement, however, has often proved to be difficult due to the very low voltage present on the bank and across the switches at the time of peak current. This paper reports on the successful efforts made to develop a low-inductance crowbar switch for FRCHX and to ultimately enable successful triggering and operation of the four parallel rail-gap switches used in the crowbar. The design of the parallel switch assembly is presented first, followed by a description of the triggering scheme employed to ensure conduction of all four switches.
Starting Page	1
Ending Page	6
File Size	4402632
Page Count	6
File Format	PDF
e-ISBN	9781479984039
DOI	10.1109/PPC.2015.7296980
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inductance Discharges (electric) Plasmas Switches Capacitors Modulation Electrodes
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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