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Proceedings Paper

Streak camera performance with large-format CCD readout
Author(s): Richard A. Lerche; David S. Andrews; Perry M. Bell; Roger L. Griffith; Joseph W. McDonald; Peter Torres; Gene Vergel de Dios
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Paper Abstract

The ICF program at Livermore has a large inventory of optical streak cameras that were built in the 1970s and 1980s. The cameras include microchannel plate image-intensifier tubes (IIT) that provide signal amplification and early lenscoupled CCD readouts. Today, these cameras are still very functional, but some replacement parts such as the original streak tube, CCD, and IIT are scarce and obsolete. This article describes recent efforts to improve the performance of these cameras using today’s advanced CCD readout technologies. Very sensitive, large-format CCD arrays with efficient fiber-optic input faceplates are now available for direct coupling with the streak tube. Measurements of camera performance characteristics including linearity, spatial and temporal resolution, line-spread function, contrast transfer ratio (CTR), and dynamic range have been made for several different camera configurations: CCD coupled directly to the streak tube, CCD directly coupled to the IIT, and the original configuration with a smaller CCD lens coupled to the IIT output. Spatial resolution (limiting visual) with and without the IIT is 8 and 20 lp/mm, respectively, for photocathode current density up to 25% of the Child-Langmuir (C-L) space-charge limit. Temporal resolution (fwhm) deteriorates by about 20% when the cathode current density reaches 10% of the C-L space charge limit. Streak tube operation with large average tube current was observed by lluminating the entire slit region through a Ronchi ruling and measuring the CTR. Sensitivity (CCD electrons per streak tube photoelectron) for the various configurations ranged from 7.5 to 2,700 with read noise of 7.5 to 10.5 electrons. Optimum spatial resolution is achieved when the IIT is removed. Maximum dynamic range requires a configuration where a single photoelectron from the photocathode produces a signal that is 3 to 5 times the read noise.

Paper Details

Date Published: 6 February 2004
PDF: 11 pages
Proc. SPIE 5210, Ultrahigh- and High-Speed Photography, Photonics, and Videography, (6 February 2004); doi: 10.1117/12.508397
Show Author Affiliations
Richard A. Lerche, Lawrence Livermore National Lab. (United States)
David S. Andrews, Lawrence Livermore National Lab. (United States)
Perry M. Bell, Lawrence Livermore National Lab. (United States)
Roger L. Griffith, Lawrence Livermore National Lab. (United States)
Joseph W. McDonald, Lawrence Livermore National Lab. (United States)
Peter Torres, Lawrence Livermore National Lab. (United States)
Gene Vergel de Dios, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 5210:
Ultrahigh- and High-Speed Photography, Photonics, and Videography
Donald R. Snyder, Editor(s)

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