NDLI: Self-magnetic-pinched diode studies for radiographic applications

Content Provider	IEEE Xplore Digital Library
Author	Hinshelwood, D. Cooperstein, G. Mosher, D. Ponce, D.M. Strasburg, S. Swanekamp, S.B. Stephanakis, S.J. Weber, B.V. Young, F.C. Critchley, A. Crotch, I. Threadgold, J.
Copyright Year	2004
Description	Author affiliation: Div. of Plasma Phys., Naval Res. Lab., Washington, DC, USA (Hinshelwood, D.; Cooperstein, G.)
Abstract	Summary form only given. The self-magnetic-pinch diode is a high-impedance (/spl sim/30-Ohm), low R/D (typically 4-mm/8-mm) pinched-beam diode that shows promise for high-power X-radiography. Ultimate development of this diode depends critically on the diode impedance behavior, the angular distribution of the electron beam on the anode converter, and the size of the resulting pinch. The first determines the operating range of applicable drivers, the second determines the conversion efficiency, and the last determines the radiographic spot size. Several approaches to improving performance are under study at AWE, SNL, and NRL, including optimized cathode geometry, structured anodes, and a possible plasma prefill. These studies require both informative diagnostics and effective code modeling capability. We have begun a combined experimental and theoretical study of this diode on the 1.8-MV Gamble II generator. A reentrant parallel load diverts most of the machine current, resulting in typical diode parameters of 1.7 MV and 30-60 kA. The electron-incidence-angle-distribution is diagnosed using an array of photodiodes and a low-Z converter. The spot size is diagnosed using a rolled edge and film (time-integrated) or and array of p-i-n's (time-resolved). Coarser features of the beam focusing are diagnosed using a fast scintillator behind the converter and a fast framing camera. Dense electrode plasmas are characterized using a holographic interferometer. Lower-density-regions of the electrode plasmas are measured using a sensitive quadrature interferometer and a multi-channel heterodyne interferometer.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	77649
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1339795
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Diodes Plasma diagnostics Plasma measurements Anodes Electrodes Plasma density Impedance Electron beams Diagnostic radiography Cathodes
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Condensed Matter Physics Atomic and Molecular Physics, and Optics

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Survey of plasma diagnostic techniques applicable to radiographic diodes

Characterization of a self-magnetic-pinched diode

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High-Power Pinched-Beam Diode Development for Radiographic Applications

Development of methods to measure the build quality of the self magnetic pinch radiographic diode

Self-magnetic-pinched diode studies for radiographic applications

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