Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BO04: ICF Diagnostics
9:30 AM–12:18 PM,
Monday, October 17, 2022
Room: Ballroom 111 A
Chair: Kevin Meaney, LANL
Abstract: BO04.00007 : Thin coded apertures for high-energy neutron and x-ray imaging*
10:42 AM–10:54 AM
Presenter:
Matthew P Selwood
(Lawrence Livermore Natl Lab / University of York)
Authors:
Matthew P Selwood
(Lawrence Livermore Natl Lab / University of York)
David N Fittinghoff
(Lawrence Livermore Natl Lab)
Graeme G Scott
(Lawrence Livermore Natl Lab)
Chris Spindloe
(Scitech Precision)
Petr L Volegov
(Lawrence Livermore Natl Lab)
Jackson G Williams
(Lawrence Livermore Natl Lab)
Chris D Murphy
(University of York)
Here we demonstrate a coded aperture with scatter and partial attenuation included (CASPA) and compare it to the more common method of pinhole imaging. We confirm the well-known throughput increase of coded apertures, and show that the decoding algorithm relaxes the need for a thick substrate. This may allow for thinner, easier to align and potentially cheaper alternatives to be fielded. We explore CASPAs for ICF experiments fielded at the NIF using Geant4 simulations to discuss the viability of this technique to measure neutron or x-ray implosion asymmetries, and test the feasibility of using these CASPAs for high repetition rate, short pulse laser-driven neutron experiments.
*This work was partially performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA2734, and funded by the LLNL LDRD program under tracking code 22-ERD-022.
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