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Proceedings Paper

Picosecond imaging of inertial confinement fusion plasmas using electron pulse-dilation
Author(s): T. J. Hilsabeck; S. R. Nagel; J. D. Hares; J. D. Kilkenny; P. M. Bell; D. K. Bradley; A. K. L. Dymoke-Bradshaw; K. Piston; T. M. Chung
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Paper Abstract

Laser driven inertial confinement fusion (ICF) plasmas typically have burn durations on the order of 100 ps. Time resolved imaging of the x-ray self emission during the hot spot formation is an important diagnostic tool which gives information on implosion symmetry, transient features and stagnation time. Traditional x-ray gated imagers for ICF use microchannel plate detectors to obtain gate widths of 40-100 ps. The development of electron pulse-dilation imaging has enabled a 10X improvement in temporal resolution over legacy instruments. In this technique, the incoming x-ray image is converted to electrons at a photocathode. The electrons are accelerated with a time-varying potential that leads to temporal expansion as the electron signal transits the tube. This expanded signal is recorded with a gated detector and the effective temporal resolution of the composite system can be as low as several picoseconds. An instrument based on this principle, known as the Dilation X-ray Imager (DIXI) has been constructed and fielded at the National Ignition Facility. Design features and experimental results from DIXI will be presented.

Paper Details

Date Published: 20 February 2017
PDF: 6 pages
Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103280S (20 February 2017); doi: 10.1117/12.2270483
Show Author Affiliations
T. J. Hilsabeck, General Atomics (United States)
S. R. Nagel, Lawrence Livermore National Lab. (United States)
J. D. Hares, Kentech Instruments Ltd. (United Kingdom)
J. D. Kilkenny, General Atomics (United States)
P. M. Bell, Kentech Instruments Ltd. (United Kingdom)
D. K. Bradley, Kentech Instruments Ltd. (United Kingdom)
A. K. L. Dymoke-Bradshaw, Lawrence Livermore National Lab. (United States)
K. Piston, Kentech Instruments Ltd. (United Kingdom)
T. M. Chung, TMC2 Innovations LLC (United States)

Published in SPIE Proceedings Vol. 10328:
Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics
T. Goji Etoh; Hiroyuki Shiraga, Editor(s)

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