Scientists reject restrictive heat flux models using directly driven gold spheres

April 15, 2021- 
A team of scientists have conducted an analysis of directly driven gold sphere experiments to test heat transport models used in inertial confinement fusion (ICF) and high energy density (HED) modeling. It was found that overly restricting the heat flux caused disagreement with measurement. However, simulations with a reduced nonlocal heat transport model quantitatively matched the...

Lab team’s new interferometric instrument improves refractive index measurements at high pressure

April 9, 2021- 
In a paper recently published by Scientific Reports, a team of scientists from Lawrence Livermore National Laboratory (LLNL) describes a high-precision interferometer system, newly developed to measure the pressure dependence of the refractive index and its dispersion in diamond anvil cells (DACs). “Accurately measuring the index of a compressed sample in DACs is a powerful...

Different neutron energies enhance asteroid deflection

April 8, 2021- 
A research collaboration between Lawrence Livermore National Laboratory (LLNL) and the Air Force Institute of Technology (AFIT) investigates how the neutron energy output from a nuclear device detonation can affect the deflection of an asteroid. Scientists compared the resulting asteroid deflection from two different neutron energy sources, representative of fission and fusion neutrons...

LLNL researchers and business development executives capture best-ever three technology transfer awards

April 7, 2021- 
Researchers from Lawrence Livermore National Laboratory (LLNL) and their colleagues who help them commercialize technologies have won three national technology transfer awards this year. The trio of awards, from the Federal Laboratory Consortium (FLC), represent the most national awards that LLNL has ever won in one year’s competition over the past 36 years. Two of the awards will be...

Researchers discover unusual property in hydrogen fuel device that could be ultimate guide to self-improvement

April 6, 2021- 
Three years ago, scientists at the University of Michigan discovered an artificial photosynthesis device made of silicon and gallium nitride (Si/GaN) that harnesses sunlight into carbon-free hydrogen for fuel cells with twice the efficiency and stability of some previous technologies. Now, scientists at Lawrence Livermore and Lawrence Berkeley national laboratories – in collaboration...

COVID-19 HPC Consortium reflects on past year

April 1, 2021- 
COVID-19 HPC Consortium scientists and stakeholders met virtually on March 23 to mark the consortium’s one-year anniversary, discussing the progress of research projects and the need to pursue a broader organization to mobilize supercomputing access for future crises. The White House announced the launch of the public-private consortium, which provides COVID-19 researchers with free access...

Improved models of cloud drizzle-turbulence interactions could enhance future climate predictions

March 31, 2021- 
Large decks of closely spaced stratocumulus clouds hover over the ocean and cover vast areas — literally thousands of miles of the subtropical oceans — and linger for weeks to months. These marine clouds reflect more solar radiation than the surface of the ocean, providing a cooling effect on the Earth’s surface. Stratocumulus clouds are an important component of the Earth’s radiation...

Researchers isolate geometric effects and resonant scattering in the X-ray spectra of HED plasmas

March 29, 2021- 
For the first time, researchers have isolated in a controlled laboratory setting the effects of the plasma geometry in its X-ray emission spectrum – the energy distribution of the radiation the plasmas emit. The work also is the first experimental testbed of the theories describing a phenomenon known in astrophysics as resonant scattering. This phenomenon is found in a plasma of...

Scientists put additive manufactured foams to the test

March 25, 2021- 
Lawrence Livermore National Laboratory (LLNL) scientists recently published the results of a three-week experimental campaign at the Lab’s Jupiter Laser Facility to test the performance of laser-heated additive manufactured foams. The project helps support two major Laboratory focus areas, including helping to advance additive manufacturing and by enabling improvements in performance...

Lab researchers find elevated CO2 emissions increase plant carbon uptake but decrease soil carbon storage

March 24, 2021- 
Elevated carbon dioxide emissions from human activities increase the uptake of carbon by plants but may decrease storage in soil. An international team led by Lawrence Livermore National Laboratory (LLNL) scientists synthesized 108 elevated carbon dioxide (CO2) experiments in various ecosystems to find out how much carbon is absorbed by plants and soil. The research appears in the journal...

Natural variations help resolve a climate puzzle

March 22, 2021- 
New research shows that naturally occurring climate variations help to explain a long-standing difference between climate models and satellite observations of global warming. Satellite measurements of global-scale changes in atmospheric temperature began in late 1978 and continue to the present. Relative to most model simulations, satellite data has consistently shown less warming of...

Research uncovers missing physics in explosive hotspots

March 16, 2021- 
Research conducted on Lawrence Livermore National Laboratory’s (LLNL) supercomputer Quartz highlights findings made by scientists that reveal a missing aspect of the physics of hotspots in TATB (1,3,5-trimamino-2,4,6-trinitrobenzene) and other explosives. Hotspots are localized regions of elevated temperature that form from shock-induced collapse of microstructural porosity and are...

Greenland landscape history preserved under ice sheet

March 15, 2021- 
Greenland wasn’t always covered in ice. In fact, within the last 1.1 million years, Greenland had thriving vegetation and ecosystems. That is the conclusion of an international group of researchers, including a scientist from Lawrence Livermore National Laboratory (LLNL), that analyzed sediment at the base of the Camp Century ice core (1.4 kilometers deep) collected in 1966. The research...

No miracles required: Scientists, industry experts agree California’s carbon capture and storage can be a reality

March 12, 2021- 
When it comes to California implementing a carbon capture and storage program to reach the state’s goal of carbon neutrality by 2045, nothing too newfangled needs to take place. During a forum titled “Carbon Capture and Sequestration in California: Regional Insights and Community Attitudes,” a group of scientists, California policymakers and industry leaders came together to discuss the...

Stepped-up U.S. investment in fusion energy

March 12, 2021- 
An influential Department of Energy (DOE) advisory committee has recommended that the nation move aggressively toward the deployment of fusion energy, including investments in technology and equipment to support one of the core missions of LLNL’s National Ignition Facility (NIF) — laying the groundwork for the development of inertial fusion energy (IFE). The report, Powering the Future...

Ten-year anniversary of Fukushima observed

March 11, 2021- 
Ten years ago today, on March 11, 2011, a 9.0 Richter-scale earthquake and tsunami in Japan resulted in severe damage to the Fukushima Dai-ichi nuclear power plant and also led to releases of radioactivity into the environment. That same day, the U.S. Department of Energy (DOE) activated Lawrence Livermore National Laboratory’s National Atmospheric Release Advisory Center (NARAC)...

Research identifies a pressure-induced increase in efficiency, phase transition of thermoelectric materials

March 10, 2021- 
Researchers have shown how applying pressure to a specific thermoelectric material, TiNiSn, increases its efficiency and leads to a structural phase transition. Thermoelectric materials are materials that can provide energy without the need for mechanical parts by converting heat energy into electrical energy. Thus, research aimed at these materials can identify new, more efficient materials...

LLNL and NPS ink MOU for collaboration

March 10, 2021- 
Whether working informally or through a collaboration agreement, Lawrence Livermore National Laboratory (LLNL) and the Monterey-based Naval Postgraduate School (NPS) have enjoyed an enduring relationship for more than two decades. While the two institutions have worked together informally for years, until recently they had only one memorandum of understanding (MOU) spelling out their joint...

'Self-trained' deep learning to improve disease diagnosis

March 4, 2021- 
New work by computer scientists at Lawrence Livermore National Laboratory (LLNL) and IBM Research on deep learning models to accurately diagnose diseases from X-ray images with less labeled data won the Best Paper award for Computer-Aided Diagnosis at the SPIE Medical Imaging Conference on Feb. 19. The technique, which includes novel regularization and “self-training” strategies...

Doubling creation of antimatter using same laser energy

March 3, 2021- 
Lawrence Livermore National Laboratory (LLNL) scientists have achieved a near 100 percent increase in the amount of antimatter created in the laboratory. Using targets with micro-structures on the laser interface, the team shot a high-intensity laser through them and saw a 100 percent increase in the amount of antimatter (also known as positrons). The research appears in Applied Physics...