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Proceedings Paper

Picosecond optical MCPI-based imagers
Author(s): Robert A. Buckles; Robert L. Guyton; Patrick W. Ross
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Paper Abstract

We present the desired performance specifications for an advanced optical imager, which borrows practical concepts in high-speed microchannel plate (MCP) intensified x-ray stripline imagers and time-dilation techniques. With a four-fold speed improvement in state-of-the-art high-voltage impulse drivers, and novel atomic-layer deposition MCPs, we tender a design capable of 5 ps optical gating without the use of magnetic field confinement of the photoelectrons. We analyze the electron dispersion effects in the MCP and their implications for gating pulses shorter than the MCP transit time. We present a wideband design printed-circuit version of the Series Transmission Line Transformer (STLT) that makes use of 50-ohm coaxial 1.0 mm (110 GHz) and 1.85 mm (65 GHz) hermetically sealed vacuum feedthroughs and low-dispersion Teflon/Kapton circuit materials without the use of any vias. The STLT matches impedance at all interfaces with a 16:1 impedance (4:1 voltage) reduction, and delivers a dispersion-limited sharp impulse to the MCP strip. A comparison of microstrip design calculations is given, showing variances between method of moments, empirical codes, and finite element methods for broad, low-impedance traces. Prototype performance measurements are forthcoming.

Paper Details

Date Published: 15 October 2012
PDF: 13 pages
Proc. SPIE 8505, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion, 850502 (15 October 2012); doi: 10.1117/12.930314
Show Author Affiliations
Robert A. Buckles, National Security Technologies, LLC (United States)
Robert L. Guyton, National Security Technologies, LLC (United States)
Patrick W. Ross, National Security Technologies, LLC (United States)

Published in SPIE Proceedings Vol. 8505:
Target Diagnostics Physics and Engineering for Inertial Confinement Fusion
Perry Bell; Gary P. Grim, Editor(s)

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