191 citations · 517 across the 31 of their papers we have counts for
31 papers
Ultrafast Radiographic Imaging and Tracking: An overview of instruments, methods, data, and applications
Zhehui Wang, Andrew F. T. Leong, Angelo Dragone +25
Ultrafast radiographic imaging and tracking (U-RadIT) use state-of-the-art ionizing particle and light sources to experimentally study sub-nanosecond dynamic processes in physics,…
Picosecond X-ray Imaging of Shockwaves with Non-Rankine-Hugoniot Behavior
Christopher S. Campbell, Mirza Akhter, Samuel Clark +3
The first-known observation of plasma-induced cavitation bubbles and expanding shockwaves in liquid during plasma initiation timescales reveals deviation from expected Rankine-Hugo…
Needs, trends, and advances in scintillators for radiographic imaging and tomography
Zhehui Wang, Christophe Dujardin, Matthew S. Freeman +17
Scintillators are important materials for radiographic imaging and tomography (RadIT), when ionizing radiations are used to reveal internal structures of materials. Since its inven…
Efficiency Studies of Fast Neutron Tracking using MCNP
Pinghan Chu, Michael R. James, Zhehui Wang
Fast neutron identification and spectroscopy is of great interest to nuclear physics experiments. Using the neutron elastic scattering, the fast neutron momentum can be measured. (…
Efficient Spiking Neural Networks with Radix Encoding
Zhehui Wang, Xiaozhe Gu, Rick Goh +2
Spiking neural networks (SNNs) have advantages in latency and energy efficiency over traditional artificial neural networks (ANNs) due to its event-driven computation mechanism and…
Entangled-photon interferometry for plasmas
Zhehui Wang, Yanhua Shih
Sub-picosecond coincidence timing from nonlocal intensity interference of entangled photons allows quantum interferometry for plasmas. Using a warm plasma dispersion relation, we c…
Neural Network for 3D ICF Shell Reconstruction from Single Radiographs
Bradley T. Wolfe, Zhizhong Han, Jonathan S. Ben-Benjamin +8
In inertial confinement fusion (ICF), X-ray radiography is a critical diagnostic for measuring implosion dynamics, which contains rich 3D information. Traditional methods for recon…
Billion-pixel X-ray camera (BiPC-X)
Zhehui Wang, Kaitlin Anagnost, Cris W. Barnes +11
The continuing improvement in quantum efficiency (above 90% for single visible photons), reduction in noise (below 1 electron per pixel), and shrink in pixel pitch (less than 1 mic…
Time-lens Photon Doppler Velocimetry (TL-PDV)
Pinghan Chu, Velat Kilic, Mark A. Foster +1
We describe a time lens to expand the dynamic range of photon Doppler velocimetry (PDV) systems. The principle and preliminary design of a time-lens PDV (TL-PDV) are explained and…
Strong scattering and parallel guiding of ultracold neutrons
Zhehui Wang, Marcel Demarteau, C. L. Morris +1
For ultracold neutrons with a kinetic energy below 10 neV, strong scattering, characterized by , can be obtained in metamaterials of C and Li. Here a…
Monte Carlo Modeling and Design of Photon Energy Attenuation Layers (PALs) for 10-30x Quantum Yield Enhancement in Si-based Hard X-ray Detectors
Eldred Lee, Michael R. James, Kaitlin M. Anagnost +3
High-energy (>20keV) X-ray photon detection at high quantum yield, high spatial resolution and short response time has long been an important area of study in physics. Scintillatio…
Ultrafast X-ray imaging of pulsed plasmas in water
Christopher Campbell, Xin Tang, Yancey Sechrest +3
Pulsed plasmas in liquids exhibit complex interaction between three phases of matter (liquids, gas, plasmas) and are currently used in a wide range of applications across several f…
EDCompress: Energy-Aware Model Compression for Dataflows
Zhehui Wang, Tao Luo, Joey Tianyi Zhou +1
Edge devices demand low energy consumption, cost and small form factor. To efficiently deploy convolutional neural network (CNN) models on edge device, energy-aware model compressi…
High-Speed Imaging of Transition from Fluid Breakup to Phase Explosion in Electric Explosion of Tungsten Wires in Air
Yancey Sechrest, Christopher Campbell, Xin Tang +2
High-speed visible imaging of sub-microsecond electric explosion of wires at the low specific energy deposition threshold reveals three distinct modes of wire failure as capacitor…
Asynchronous and Load-Balanced Union-Find for Distributed and Parallel Scientific Data Visualization and Analysis
Jiayi Xu, Hanqi Guo, Han-Wei Shen +5
We present a novel distributed union-find algorithm that features asynchronous parallelism and k-d tree based load balancing for scalable visualization and analysis of scientific d…
Two-photon X-ray Ghost Microscope
Thomas A. Smith, Zhehui Wang, Yanhua Shih
X-ray imaging allows for a non-invasive image of the internal structure of an object. The most common form of X-ray imaging, projectional radiography, is simply a projection or "sh…
Microparticle cloud imaging and tracking for data-driven plasma science
Zhehui Wang, Jiayi Xu, Yao E. Kovach +5
Large data sets give rise to the `fourth paradigm' of scientific discovery and technology development, extending other approaches based on human intuition, fundamental laws of phys…
Hollow pellet injection for magnetic fusion
Zhehui Wang, M. A. Hoffbauer, E. M. Hollmann +7
Precise delivery of mass to burning plasmas is a problem of growing interest in magnetic fusion. The answers to how much mass is necessary and sufficient can vary depending on para…
The ISTI Rapid Response on Exploring Cloud Computing 2018
Carleton Coffrin, James Arnold, Stephan Eidenbenz +45
This report describes eighteen projects that explored how commercial cloud computing services can be utilized for scientific computation at national laboratories. These demonstrati…
Monte Carlo Simulations of Trapped Ultracold Neutrons in the UCNτ Experiment
Nathan Callahan, Chen-Yu Liu, Francisco Gonzalez +37
In the UCNτ experiment, ultracold neutrons (UCN) are confined by magnetic fields and the Earth's gravitational field. Field-trapping mitigates the problem of UCN loss on material s…
Measurement of high-temperature microparticle acceleration through imaging
Pinghan Chu, Bradley T. Wolfe, Zhehui Wang
Microparticles ranging from sub-microns to millimeter in size are a common form of matter in magnetic fusion environment, and they are highly mobile due to their small mass. Differ…
Quantum Image Processing and Its Application to Edge Detection: Theory and Experiment
Xi-Wei Yao, Hengyan Wang, Zeyang Liao +12
Processing of digital images is continuously gaining in volume and relevance, with concomitant demands on data storage, transmission and processing power. Encoding the image inform…
Random on-board pixel sampling (ROPS) X-ray Camera
Zhehui Wang, O. Iaroshenko, S. Li +7
Recent advances in compressed sensing theory and algorithms offer new possibilities for high-speed X-ray camera design. In many CMOS cameras, each pixel has an independent on-board…
Position-sensitive detection of ultracold neutrons with an imaging camera and its implications to spectroscopy
Wanchun Wei, L. J. Broussard, M. A. Hoffbauer +29
Position-sensitive detection of ultracold neutrons (UCNs) is demonstrated using an imaging charge-coupled device (CCD) camera. A spatial resolution less than 15 m has been achie…