Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging

Benedetti, L. R.; Holder, J. P.; Perkins, M.; Brown, C. G.; Anderson, C. S.; Allen, F. V.; Petre, R. B.; Hargrove, D.; Glenn, S. M.; Simanovskaia, N.; Bradley, D. K.; Bell, P. M.

doi:10.1063/1.4941754

Title: Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging

Journal Article · Fri Feb 26 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4941754· OSTI ID:1260504

Benedetti, L. R. ^[1]; Holder, J. P. ^[1]; Perkins, M. ^[2]; Brown, C. G. ^[1]; Anderson, C. S. ^[1]; Allen, F. V. ^[1]; Petre, R. B. ^[1]; Hargrove, D. ^[1]; Glenn, S. M. ^[1]; Simanovskaia, N. ^[3]; Bradley, D. K. ^[1]; Bell, P. M. ^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Varian, Las Vegas, NV (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Pacific Biosciences, Menlo Park, CA (United States)

We describe an experimental method to measure the gate profile of an x-ray framing camera and to determine several important functional parameters: relative gain (between strips), relative gain droop (within each strip), gate propagation velocity, gate width, and actual inter-strip timing. Several of these parameters cannot be measured accurately by any other technique. This method is then used to document cross talk-induced gain variations and artifacts created by radiation that arrives before the framing camera is actively amplifying x-rays. Electromagnetic cross talk can cause relative gains to vary significantly as inter-strip timing is varied. This imposes a stringent requirement for gain calibration. If radiation arrives before a framing camera is triggered, it can cause an artifact that manifests as a high-intensity, spatially varying background signal. Furthermore, we have developed a device that can be added to the framing camera head to prevent these artifacts.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1260504

Alternate ID(s):: OSTI ID: 1239612

Report Number(s):: LLNL-JRNL-661457; RSINAK

Journal Information:: Review of Scientific Instruments, Vol. 87, Issue 2; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Development of a gated X-ray imager with multiple views and spectral selectivity for observing plasma evolution in hohlraums Wang, Qiangqiang; Deng, Bo; Cao, Zhurong Review of Scientific Instruments, Vol. 90, Issue 7 https://doi.org/10.1063/1.5066319	journal	July 2019
Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility Bishel, D. T.; Bachmann, B.; Yi, A. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037073	journal	October 2018
Understanding ICF hohlraums using NIF gated laser-entrance-hole images Chen, Hui; Woods, D. T.; Jones, O. S. Physics of Plasmas, Vol. 27, Issue 2 https://doi.org/10.1063/1.5128501	journal	February 2020
Using multiple x-ray emission images of inertially confined implosions to identify spatial variations and estimate confinement volumes (invited) Benedetti, Laura Robin; Bradley, D. K.; Khan, S. F. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039381	journal	October 2018
Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility Pickworth, L. A.; Hammel, B. A.; Smalyuk, V. A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5025188	journal	May 2018
Variable convergence liquid layer implosions on the National Ignition Facility Zylstra, A. B.; Yi, S. A.; Haines, B. M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5016349	journal	May 2018
The National Ignition Facility modular Kirkpatrick-Baez microscope Pickworth, L. A.; Ayers, J.; Bell, P. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4960417	journal	August 2016
Observation of hohlraum-wall motion with spectrally selective x-ray imaging at the National Ignition Facility Izumi, N.; Meezan, N. B.; Divol, L. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4960758	journal	August 2016
Resolving hot spot microstructure using x-ray penumbral imaging (invited) Bachmann, B.; Hilsabeck, T.; Field, J. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959161	journal	August 2016
Comparison of implosion core metrics: A 10 ps dilation X-ray imager vs a 100 ps gated microchannel plate Nagel, S. R.; Benedetti, L. R.; Bradley, D. K. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959917	journal	August 2016
Beryllium capsule implosions at a case-to-capsule ratio of 3.7 on the National Ignition Facility Zylstra, A. B.; Yi, S. A.; MacLaren, S. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5041285	journal	October 2018

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