News

Team improves polar direct drive fusion neutron sources for use in National Ignition Facility experiments

April 21, 2021- 
Scientists from Lawrence Livermore National Laboratory (LLNL) and the Laboratory for Laser Energetics (LLE) are working to improve polar direct drive (PDD) neutron sources on the National Ignition Facility (NIF), the world’s most energetic laser. PDD neutron sources are capsules filled with deuterium-tritium (DT) gas at ambient temperature and shot with robust laser pulses that do not...

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...

Air Force reservists a vital part of Lab's workforce

April 14, 2021- 
On April 14, 1948, President Harry Truman established the United States Air Force Reserve, a force comprised of people who would stand ready to serve during wartime. Today the Reserve performs 20 percent of the work in the Air Force including specialized missions such as weather reconnaissance, firefighting and personnel rescue. Lawrence Livermore National Laboratory (LLNL) is proud to have...

De Supinski named one of HPCwire’s 'People to Watch'

April 13, 2021- 
Bronis R. de Supinski, Lawrence Livermore National Laboratory’s (LLNL) chief technology officer (CTO) for Livermore Computing (LC), is one of the top influencers in the high performance computing industry for 2021, according to HPCwire. On April 7, the publication honored de Supinski as one of its "People to Watch," a group of 14 “innovators and visionaries building and deploying the...

LLNL’s Falgout named to 2021 Class of SIAM Fellows

April 9, 2021- 
The Society for Industrial and Applied Mathematics (SIAM) has selected Lawrence Livermore National Laboratory (LLNL) computational mathematician Rob Falgout as an esteemed member of its 2021 Class of SIAM Fellows. The prestigious honor recognizes Falgout, a Distinguished Member of the Technical Staff in LLNL’s Center for Applied Scientific Computing, for his “contributions to the theory...

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...

Pandemic drives down U.S. energy use in 2020

April 7, 2021- 
Americans used approximately 7 percent less energy in 2020, due in part to the COVID-19 pandemic, according to energy flow charts released by Lawrence Livermore National Laboratory (LLNL). Each year, LLNL releases flow charts that illustrate the nation's consumption and use of energy. Americans used 92.9 quads (quadrillion BTU) of energy, which is 7.2 quads less or 7 percent less than...

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...

Dreicer garners NNSA Gold Award

March 26, 2021- 
When Mona Dreicer learned she had been tapped to receive one of the National Nuclear Security Administration’s (NNSA) top awards, she had two reactions – she was surprised and she was honored. The deputy director of the Lab’s Center for Global Security Research (CGSR) for six years until her retirement in 2020, Dreicer has been named a recipient of the NNSA Administrator’s Distinguished...

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...

Novel deep learning framework for symbolic regression

March 18, 2021- 
Lawrence Livermore National Laboratory (LLNL) computer scientists have developed a new framework and an accompanying visualization tool that leverages deep reinforcement learning for symbolic regression problems, outperforming baseline methods on benchmark problems. The paper was recently accepted as an oral presentation at the International Conference on Learning Representations (ICLR...

Lab event encourages growth of women in data science

March 17, 2021- 
Coinciding with International Women’s Day on March 8, Lawrence Livermore National Laboratory’s 4th Women in Data Science (WiDS) regional event brought women together to discuss successes, opportunities and challenges of being female in a mostly male field. The Lab’s first-ever virtual WiDS gathering attracted dozens of LLNL data scientists as well as some from outside the Lab, and...

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...