NDLI: Cygnus PFL switch jitter

Content Provider	IEEE Xplore Digital Library
Author	Mitton, C. Corrow, G. Hansen, M. Henderson, D. Nelson, D. Ormond, E. Cordova, S. Molina, I. Smith, J.
Copyright Year	2007
Description	Author affiliation: Sandia National Laboratories, P.O. Box 238, Mail Stop 944, Mercury, NV 89023 USA (Nelson, D.; Ormond, E.; Cordova, S.; Molina, I.) \|\| Los Alamos National Laboratory, P.O. Box 1663, Mail Stop D-410, NM 87545 USA (Smith, J.) \|\| National Security Technologies, 2621 Losee Rd., North Las Vegas, NV 89030 USA (Mitton, C.; Corrow, G.; Hansen, M.; Henderson, D.)
Abstract	The Cygnus Dual Beam Radiographic Facility consists of two identical radiographic sources: Cygnus 1 and Cygnus 2. Each source has the following X-ray output: 1-mm diameter spot size, 4 rads at 1 m, 50-ns full-width-half-maximum. The diode pulse has the following electrical specifications: 2.25 MV, 60 kA, 60 ns. This Radiographic Facility is located in an underground tunnel test area at the Nevada Test Site (NTS). The sources were developed to produce high-resolution images on subcritical tests performed at NTS. Subcritical tests are single-shot, high-value events. For this application, it is desirable to maintain a high level of reproducibility in source output. The major components of the Cygnus machines are Marx generator, water-filled pulse forming line (PFL), water-filled coaxial transmission line, three-cell inductive voltage adder, and rod-pinch diode. A primary source of fluctuation in Cygnus shot-to-shot performance may be jitter in breakdown of the main PFL switch, which is a “self-break” switch. The PFL switch breakdown time determines the peak PFL charging voltage, which ultimately affects the source X-ray spectrum and dose. Therefore, PFL switch jitter may contribute to shot-to-shot variation in these parameters, which are crucial to radiographic quality. In this paper we will present PFL switch jitter analysis for both Cygnus machines and present the correlation with dose. For this analysis, the PFL switch on each machine was maintained at a single gap setting, which has been used for the majority of shots at NTS. In addition the PFL switch performance for one larger switch gap setting will be examined.
Starting Page	415
Ending Page	419
File Size	957865
Page Count	5
File Format	PDF
ISBN	9781424409136
DOI	10.1109/PPPS.2007.4651871
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Jitter Radiography Monitoring Correlation Diagnostic radiography Electric breakdown
Content Type	Text
Resource Type	Article

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