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

Abstract

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.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [1]
+ Show Author Affiliations
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Varian, Las Vegas, NV (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Pacific Biosciences, Menlo Park, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1260504
Alternate Identifier(s):
OSTI ID: 1239612
Report Number(s):
LLNL-JRNL-661457
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 2; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; cameras; x-ray imaging; x-ray lasers; electrons; x-rays

Citation Formats

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., and Bell, P. M. Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging. United States: N. p., 2016. Web. doi:10.1063/1.4941754.
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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. Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging. United States. https://doi.org/10.1063/1.4941754
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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., and Bell, P. M. Fri . "Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging". United States. https://doi.org/10.1063/1.4941754. https://www.osti.gov/servlets/purl/1260504.
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@article{osti_1260504,
title = {Advances in x-ray framing cameras at the National Ignition Facility to improve quantitative precision in x-ray imaging},
author = {Benedetti, L. R. and Holder, J. P. and Perkins, M. and Brown, C. G. and Anderson, C. S. and Allen, F. V. and Petre, R. B. and Hargrove, D. and Glenn, S. M. and Simanovskaia, N. and Bradley, D. K. and Bell, P. M.},
abstractNote = {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.},
doi = {10.1063/1.4941754},
journal = {Review of Scientific Instruments},
number = 2,
volume = 87,
place = {United States},
year = {Fri Feb 26 00:00:00 EST 2016},
month = {Fri Feb 26 00:00:00 EST 2016}
}
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https://doi.org/10.1063/1.4941754
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    Works referencing / citing this record:

    Development of a gated X-ray imager with multiple views and spectral selectivity for observing plasma evolution in hohlraums
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    Using time-resolved penumbral imaging to measure low hot spot x-ray emission signals from capsule implosions at the National Ignition Facility
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