Feasibility of fluorescence-based imaging of high-energy-density hydrodynamics experiments

Abstract

Experiments conducted on the LANL Trident two-beam facility show the viability of fluorescence-based imaging as a diagnostic in high-energy-density (HED) hydrodynamics experiments. Passive fluorescence experiments using titanium-pumped scandium-oxide, or iron-pumped manganese-oxide, show that fluorescence emission can be produced at sufficient intensities to be useful. Dynamic experiments, designed to demonstrate particle tracking in time for particle imaging velocimetry (PIV), were marginally successful in that only very large particulates could be definitively observed. However, our results indicate that experiments conducted on facilities offering a greater energy would be less susceptible to the limitations confronted in this study and thus, significantly enhance the prospect of PIV as an effective diagnostic tool in HED experiments.

Design and scale-up of sonochemical reactors for food processing and other applications

“…However, the results were unreliable because bubbles of different sizes are distributed randomly in the liquid medium. To overcome this problem, the reactor media is seeded with fluorescent tracers (Kumar et al, 2007;Lanier et al, 2003). Boldo et al (2004) reported the use of the PIV measurement approach to determine liquid circulation velocity and vibration amplitude using the time-averaging holography method.…”

Demonstration of x-ray fluorescence imaging of a high-energy-density plasma

“…XRFI has previously been considered as a diagnostic for high energy density experiments 2 and a previous experiment a) Contributed paper, published as part of the Proceedings of the 20th Topical Conference on High-Temperature Plasma Diagnostics, Atlanta, Georgia, USA, June 2014. b) macdonm@umich.edu by Lanier et al 3 showed that x-ray fluorescence signals can be imaged, but no shock was observed due to the large dopant particles used. Here we present the results from experiments at the Trident Laser Facility at Los Alamos National Lab 4 using XRFI to image a shock in a planar geometry.…”

Imaging scattered x-ray radiation for density measurements in hydrodynamics experiments on NIF

“…This technique is known as particle imaging velocimetry (PIV), which is commonly used in fluid flow experiments [3]. Previous studies have had difficulties producing dopant granules small enough to move freely with the flowing material, a condition known as hydrodynamic invisibility [4]. Achieving hydrodynamic invisibility will require smaller dopant granules, in turn requiring an imaging system with higher spatial resolution to track individual particles.…”

“…t the photoabsorption the several-keV range n the scattering cross DP experiment by inpant. Developing this rammatic applications aging in NIF hydrodynamic experiments [4] to cross validation of temfrom x-ray Thomson scattering [5]. ty system by induced fluorescence was first proposed by Lanier et al [6].…”

“…Lanier et al to derive the fluorescent intensity for a given volume element within the target [4]. Here the appropriate changes have been made for the specified target geometry.…”