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31 August 2015 Optimizing the input and output transmission lines that gate the microchannel plate in a high-speed framing camera
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Abstract
We present new designs for the launch and receiver boards used in a high speed x-ray framing camera at the National Ignition Facility. The new launch board uses a Klopfenstein taper to match the 50 ohm input impedance to the ~10 ohm microchannel plate. The new receiver board incorporates design changes resulting in an output monitor pulse shape that more accurately represents the pulse shape at the input and across the microchannel plate; this is valuable for assessing and monitoring the electrical performance of the assembled framing camera head. The launch and receiver boards maximize power coupling to the microchannel plate, minimize cross talk between channels, and minimize reflections. We discuss some of the design tradeoffs we explored, and present modeling results and measured performance. We also present our methods for dealing with the non-ideal behavior of coupling capacitors and terminating resistors. We compare the performance of these new designs to that of some earlier designs.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John B. Lugten, Charles G. Brown Jr., Kenneth W. Piston, Bart V. Beeman, Fred V. Allen, Dustin T. Boyle, Christopher G. Brown, Jason G. Cruz, Douglas R. Kittle, Alexander A. Lumbard, Peter Torres III, Dana R. Hargrove, Laura Robin Benedetti, and Perry M. Bell "Optimizing the input and output transmission lines that gate the microchannel plate in a high-speed framing camera", Proc. SPIE 9591, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion IV, 95910L (31 August 2015); https://doi.org/10.1117/12.2189139
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