Design and implementation of high magnification framing camera for NIF "ARIANE Light" Page: 3 of 14
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Design and implementation of high magnification framing camera for NIF "ARIANE Light"
Jay Ayers, Brian Felker, Vladimir Smalyuk, Nobohiko Izumi, Ken Piston, Joe Holder, Gary Power,
Fred Allen, Natalia Simanovska, Perry Bell, Dave Bradley, Zachary Lamb
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA
Gated X-Ray imagers have been used on many ICF experiments around the world for time resolved
imaging of the target implosions. ARIANE (Active Readout In A Neutron Environment) has been
developed for use in the National Ignition Facility and has been deployed in multiple phases.
Phase 1 (complete) known as ARIANE Ultra Light (Alignment proof of concept), Phase 2a known as
ARIANE Light (complete) (X-ray gated detector with electronic recording), Phase 2b (complete)
(X-ray gated detector with film recording) and Phase 3 known as ARIANE Heavy which is currently
under development. The ARIANE diagnostic is comprised of the following subsystems: pinhole
imaging system, filtering, detector head, detector head electronics, control electronics, CCD, and film
recording systems. The phased approach allows incremental increases in tolerance to neutron yield.
Phase 2a and 2b have been fielded successfully and captured gated implosion images on CCD and
film at yields up to 7 x 1014. As the yields in the NIF increase Phase 3 will be a longer term solution
incorporating indirect optical path, improved hardened advanced detectors and significant (tons) of
shielding. Design and Initial commissioning data for Phase 1-2b are presented here.
Lawrence Livermore National Laboratory is operated by Lawrence Livermore National Security, LLC,
for the U.S. Department of Energy, National Nuclear Security Administration under Contract
Time gated x-ray imaging  is essential for the National Ignition Campaign (NIC)  which is
currently underway at the National Ignition Facility (NIF) . Time gated imaging provides temporally
resolved images that are used for measuring shape, size and burn history of an imploding cryogenic
deuterium-tritium (DT) capsule as it is compressed during Inertial Confinement Fusion (ICF).
Studying the symmetry and the fuel size during implosion are two key parameters used to optimize
tuning experiments of the NIC [2,3]. As the yields increase new designs for time resolved x-ray
imaging systems are required. The most common of these are pinhole array framing cameras that
consist of a pinhole array that produces a large number of x-ray images onto a micro channel plate
(MCP). The temporal gating of the MCP allows the x-ray images to be captured at different times
allowing a reconstruction into a movie of the target shape size and burn history over a 1 ns time
scale. The x-rays are converted to electrons in the MCP. The resulting cascade of electrons are
accelerated through the MCP and multiplied to a high order [4,5]. After exiting the MCP the electrons
are converted to visible photons from the phosphor coating on the fiber optic face plate. The photons
are transmitted through the fiber optic face plate for recording onto an electronic CCD readout or film
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Ayers, M J; Felker, B; Smalyuk, V; Izumi, N; Piston, K; Holder, J et al. Design and implementation of high magnification framing camera for NIF "ARIANE Light", article, August 6, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc842311/m1/3/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.