Picosecond imaging of inertial confinement fusion plasmas using electron pulse-dilation

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

doi:10.1117/12.2270483

20 February 2017 Picosecond imaging of inertial confinement fusion plasmas using electron pulse-dilation

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

Author Affiliations +

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 103280S (2017) https://doi.org/10.1117/12.2270483
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

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.

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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, and T. M. Chung "Picosecond imaging of inertial confinement fusion plasmas using electron pulse-dilation", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103280S (20 February 2017); https://doi.org/10.1117/12.2270483

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