X-ray imaging in an environment with high-neutron background on National Ignition Facility Page: 3 of 8
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X-ray imaging in an environment with high-neutron background on
National Ignition Facility
V.A. Smalyuk a, J. Ayers a, P. M. Bell a, J.-L. Bourgade b, D. K. Bradley a, J. Celeste a, C. Cerjana, S.
Darbon b, J. Emig a, B. Felker a, C. Hagmanna, J. Holder a, N. Izumi a, J. D. Kilkenny , J. Moody a, K.
Piston a, A. Rousseau b, C. Sorce a, R. Tommasini
aLLNL, 7000 East Ave, Livermore, USA 94550; bCEA, France; CGA, San Diego, CA
ABSTRACT
X-ray imaging instruments will operate in a harsh ionizing radiation background environment on implosion experiments
at the National Ignition Facility. These backgrounds consist of mostly neutrons and gamma rays produced by inelastic
scattering of neutrons. Imaging systems based on x-ray framing cameras with film and CCD's have been designed to
operate in such harsh neutron-induced background environments. Some imaging components were placed inside a
shielded enclosure that reduced exposures to neutrons and gamma rays. Modeling of the signal and noise of the x-ray
imaging system is presented.
Keywords: x-ray imaging, neutron-induced backgrounds
1. INTRODUCTION
Time-gated, x-ray imaging [1] is an essential part of the National Ignition Campaign (NIC) [2], currently underway
on the National Ignition Facility (NIF) [3].Pinhole array at 27 cm from TCC
IL
Target chamber wall
Optical relay system
Gated detector on
the line of sightGated Electronic recording
system with CCD in a
h cld eCnclosureDiagnostic Insertion Module (DIM)
U-
Figure 1: ARIANE consists of a 8- m diameter pinhole array at 27 cm from TCC, a framing camera outside target chamber wall at 7
meters from TCC, optical relay system, shielded enclosure, and a gated recording system with CCD inside this enclosure for
additional gating of the optical light at the output of the framing camera.TCC
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Smalyuk, V A; Ayers, J; Bell, P M; Bourgade, J -; Bradley, D K; Celeste, J et al. X-ray imaging in an environment with high-neutron background on National Ignition Facility, article, July 25, 2011; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc872849/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.