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Strategic Deterrence

Researchers focus on how tantalum behaves at high pressure and temperature

Lawrence Livermore National Laboratory (LLNL) researchers have explored high-pressure behavior of shock-compressed tantalum at the Omega Laser Facility at the University of Rochester’s Laboratory for Laser Energetics (LLE). The work showed tantalum did not follow the predicted phase changes at high pressure and instead maintained the body-centered cubic (BCC) phase until…

LLNL earn 'A' grade in OPCW biomedical proficiency test

It wasn’t an easy road, but Lawrence Livermore National Laboratory (LLNL) Forensic Science Center scientists earned an “A” grade in the Organisation for the Prohibition of Chemical Weapons’ (OPCW) recent biomedical proficiency test. In addition to the usual complexity of the sample preparations and analysis, the Livermore scientists received their proficiency test samples…

LLNL delivers eight Scorpius pulsed-power modules to Los Alamos

Lawrence Livermore National Laboratory (LLNL) recently delivered eight prototype pulsed-power modules for testing to Los Alamos National Laboratory (LANL), marking completion of a key milestone in a multi-lab effort to develop Scorpius, a next-generation particle accelerator for X-ray imaging. The line replaceable units (LRU) will provide the precise energy pulses needed…

Shining a Bright Light on Plutonium

As the nation’s adversaries move to close the gap in weapon capabilities, Lawrence Livermore’s mission remains focused on supporting stockpile stewardship. Assessing weapon readiness becomes more challenging, however, with an aging stockpile and a workforce decades removed from the last live nuclear weapon tests. Computer simulations can model weapon behavior but require…

LLNL hosts Test Site Verification Team orientation

Lawrence Livermore National Laboratory (LLNL) hosted an in-person orientation meeting recently for members of the National Nuclear Security Administration’s (NNSA) Test Site Verification Team (TSVT). TSVT is sponsored by NNSA’s Office of Nuclear Verification (ONV) Nuclear Compliance Verification (NCV) Program. The TSVT is led by Kim Knight from LLNL and Emily Schultz…

LLNL's Forensic Science Center earns 'A' grade in OPCW environmental test

This fall, a score of scientists from Lawrence Livermore National Laboratory's (LLNL) Forensic Science Center (FSC) will start two weeks of long days to undertake the Organisation for the Prohibition of Chemical Weapons (OPCW) environmental proficiency test. Livermore scientists have been taking the proficiency tests each October since 2001, with LLNL serving as one of two…

LLNL delivers eight Scorpius pulsed-power modules to Los Alamos

Lawrence Livermore National Laboratory (LLNL) recently delivered eight prototype pulsed-power modules for testing to Los Alamos National Laboratory (LANL), marking completion of a key milestone in a multi-lab effort to develop Scorpius, a next-generation particle accelerator for X-ray imaging. The line replaceable units (LRU) will provide the precise energy pulses needed…

LLNL and KCNSC team up to accelerate design-to-deployment with new polymer production enclave

A polymer production enclave, in partnership with the Kansas City National Security Campus (KCNSC) and Lawrence Livermore National Laboratory (LLNL), is on budget and on schedule to bring modern technology into the Nuclear Security Enterprise. The enclave will enable rapid development of design and production processes of polymer parts for modernization programs. This…

LLNL and KCNSC team up to accelerate design-to-deployment with new polymer production enclave

A polymer production enclave, in partnership with the Kansas City National Security Campus (KCNSC) and Lawrence Livermore National Laboratory (LLNL), is on budget and on schedule to bring modern technology into the Nuclear Security Enterprise. The enclave will enable rapid development of design and production processes of polymer parts for modernization programs. This…

Nuclear forensics international group holds 25th anniversary meeting

Several Lawrence Livermore National Laboratory (LLNL) scientists played key roles in the 25th annual meeting of the Nuclear Forensics International Technical Working Group (ITWG), which met last month. The event, which was conducted in a virtual setting for the first time, was attended by more than 100 experts from 30 countries and highlighted the group’s notable…

LLNL team conducts thermal, shock, vibration tests on W80-4 mock unit

A Lawrence Livermore National Laboratory (LLNL) team has conducted the first series of combined environment ground tests on a W80-4 test article to ensure that the warhead will survive thermal, shock and vibration environments that the system could be exposed to when it is in the stockpile. The Nuclear Explosive Package Engineering Test (NEPET), which began with a…

S&TR Magazine Highlights the Inertial Confinement Fusion (ICF) Program

The last U.S. underground nuclear explosive tests, which were key to assessing the design and viability of the country’s nuclear weapons, occurred over 27 years ago. However, the need for deeper understanding of the complex physical processes that drive nuclear weapon performance and for putting stockpile design and assessment on a solid science-based foundation continue…

Lawrence Livermore team looks at nuclear weapon effects for near-surface detonations

A Lawrence Livermore National Laboratory (LLNL) team has taken a closer look at how nuclear weapon blasts close to the Earth’s surface create complications in their effects and apparent yields. Attempts to correlate data from events with low heights of burst revealed a need to improve the theoretical treatment of strong blast waves rebounding from hard surfaces. This led…

Lawrence Livermore team looks at nuclear weapon effects for near-surface detonations

A Lawrence Livermore National Laboratory (LLNL) team has taken a closer look at how nuclear weapon blasts close to the Earth’s surface create complications in their effects and apparent yields. Attempts to correlate data from events with low heights of burst revealed a need to improve the theoretical treatment of strong blast waves rebounding from hard surfaces. This led…

WCI Test News 4

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WCI Test News 3

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WCI Test News 2

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WCI Test News 1

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Research describes slow and fast light in plasma

Slow and fast light, or large changes in the group velocity of light, have been observed in a range of optical media, but the fine control over the refractive index necessary to induce an observable effect has not been achieved in a plasma. In a paper published in Physical Review Letters, scientists from Lawrence Livermore National Laboratory (LLNL) and the Laboratory for…

Scientists identify key trends in high-energy-density mixing layers

Imagine a bottle of salad dressing containing oil and vinegar. The oil has a lower density than vinegar, so it floats on the vinegar. The oil will not stay trapped under the vinegar if the bottle is flipped upside down. It will bubble up through the vinegar until a stable state is restored. This simple physical process is known as Rayleigh–Taylor instability, and it can be…