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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 487 records · Page 27
All sourcesNASA NTRSDOE OSTI
DOE OSTI2017

February 2017 - NIF Highlights

February was a very productive month with only 20 shot days on the calendar. There were 41 target shots performed for the HED, ICF, and the Discovery Science (DS) program. The DS program had a week dedicated to their experiments that was extraordinarily fruitful: 14 target shots were performed for five independent teams, each of whom had a unique experimental platform to field. The teams and the facility worked extraordinarily well to pull off this feat! Additionally, the facility developed high-energy laser operations on a demonstration quad to investigate taking NIF to a new level of performance, and the ICF program demonstrated a 40% increase in the yield from a capsule that had a new, 5-μm-diameter fill tube that apparently mitigates some of the issues that have affected implosions to date. Details follow below.

42 ENGINEERING↗
DOE OSTI2017

Magnet Lab Highlight: Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors

The alkali-doped fullerides provide the first example of a transition from a three-dimensional Mott insulator to a superconductor, enabling the effects of both dimensionality and electron correlation on superconductivity to be explored. Chemically the alkali species tunes the superconductivity in the vicinity of the the Mott transition via sample volume. Measuring the relationship between the superconducting transition temperature and upper critical field reveals a crossover from weak- to strong-coupling associated with the dynamical Jahn–Teller effect as the Mott transition is approached. The use of pulsed magnets is required because the upper critical field is enhanced in the vicinity of the Mott insulating phase, reaching 90 T for RbxCs3-xC60 — the highest among cubic crystals. This required close collaboration between Prof Kasahara’s group and the Mag Lab to design rf-measurements compatible with sample encapsulation in an inert atmosphere. The concomitant increase of pairing strength with lattice volume near the Mott transition suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity (with high-T C and high-H C2 ).

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2017

Highlights from BNL and RHIC 2014

This report provides an overview of activities performed with the Relativistic Heavy Ion Collider at Brookhaven National Laboratory.

43 PARTICLE ACCELERATORS↗
DOE OSTI2017

Highlights from BNL and RHIC 2015

This report provides an overview of the activities performed with the Relativistic Heavy Ion Collider at Brookhaven National Laboratory.

43 PARTICLE ACCELERATORS↗
DOE OSTI2017

NSF-DMR Highlight from NHMFL-PFF 2017

The alkali-doped fullerides provide the first example of a transition from a three-dimensional Mott insulator to a superconductor, enabling the effects of both dimensionality and electron correlations on superconductivity to be explored. Chemically, the alkali species tunes the superconductivity in the vicinity of the Mott transition by varying the unit cell volume.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2017

Rotary Valve & Beamline Highlights for Fiscal Year 2017

This Fiscal Year (FY) work was divided between continued testing and characterization work of the Rotary Valve (RV) and mechanical engineering support for the beamline hardware stands. This configuration is more like the final setup with the accelerator firing deuterons down the evacuated beamline toward the RV for interaction with the deuterium and neutron production. The beamline cells were part of an experiment to reduce the impact that RV gas would have on the beamline vacuum. This work will be reported separately from this report. Previous testing had been with the beamline at atmospheric pressure and now the goal was to get test results of the RV with it connected to a beamline that’s running at some level of vacuum.

42 ENGINEERING↗
DOE OSTI2018

Nuclear Nonproliferation and Security Program Office - HIGHLIGHTS 2017

The Nuclear Nonproliferation and Security (NNS) Program Office within the Global Security Directorate at Los Alamos supports the Laboratory’s mission of strategic deterrence through activities aimed at detecting and preventing nuclear proliferation and improving nuclear and radiological security. The program portfolio includes research and development, deployment activities, and policy support. In FY17, work for NNSA’s Defense Nuclear Nonproliferation office (DNN, or “NA-20”) made up 80% of the NNS portfolio; therefore, most of our work is aligned with DNN’s mission.

98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL P↗
DOE OSTI2018

Tevatron Highlights [Slides]

Run 0 1987 –1988: 1.8 TeV, CDF only, 4 $pb^{-1}$ Run I 1992 –1996: 1.8 TeV, CDF + D0: 120 $pb^{-1}$ Run II 2001 –2011: 1.96 TeV, 12 $fb^{-1}$. Added Main Injector, Recycler, helical orbits, magnet alignment … Max. Instantaneous L ≈4.3 x $10^{32} cm^{-2} s^{-1}$(30M collisions/s)

43 PARTICLE ACCELERATORS↗
DOE OSTI2019

ASC news highlight for HQ, 12/11/18

LLNL’s package management tool, Spack, has reduced software build times from weeks to hours for programmatic codes, and the tool’s popularity has grown beyond the NNSA laboratories. New workflow features and ongoing community-building efforts have led ECP and many top supercomputing sites worldwide to adopt Spack as their official deployment tool. With a community of over 330 Spack contributors, the maintenance burden for over 3,000 open source packages is now shared with other centers. This reduction of general ASC software maintenance costs frees up code development resources to address unique requirements specific to the stockpile stewardship mission.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2019

NIF Monthly Highlights for July 2019

July was a productive month for scientists at the National Ignition Facility, with a significant number of target shots performed, including many developing new platforms and taking first-of-their-kind data. The HED program, the ICF program, the National Security Applications Program and the Discovery Science users each achieved significant results. The facility itself also made tremendous progress towards commissioning several new capabilities for laser diagnostics, and target-physics diagnostic systems that measure x-ray and neutron data.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2017

Highlights from BNL and RHIC 2016

The Relativistic Heavy Ion Collider (RHIC) was designed and built at Brookhaven National Laboratory (BNL) and is one of the two remaining operating hadron colliders in the world, the other being the CERN LHC. There were also several previous facilities at BNL including the 30 GeV Alternating Gradient Synchrotron (AGS–now the RHIC injector) where the muon-neutrino, and CP violation were discovered and the 3 GeV Cosmotron where the $K^0_2$ was discovered. There have been many other discoveries at BNL.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2019

Center for Computing Research Highlights

Sandia has a legacy of leadership in the advancement of high performance computing (HPC) at extreme scales. First-of-a-kind scalable distributed-memory parallel platforms such as the Intel Paragon, ASCI Red (the world’s first teraflops computer), and Red Storm (co-developed with Cray) helped form the basis for one of the most successful supercomputer product lines ever: the Cray XT series. Sandia also has pioneered system software elements—including lightweight operating systems, the Portals network programming interface, advanced interconnection network designs, and scalable I/O— that are critical to achieving scalability on large computing systems.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2019

Highlights of the 2016 Summer Laboratory Student Intern Program at Sandia National Labs [Slides]

Combined picosecond (10 -12 s) and femtosecond (10 -15 s) laser pulses can give sensitive, low-noise measurements of important quantities in reacting flows, such as species concentrations and temperature. Emmanuel’s work focused on the development of an instrument for tailoring the time profile of picosecond laser pulses for use in nonlinear optical spectroscopic methods created from broad bandwidth femtosecond pulses. In addition to constructing the device, Emmanuel produced a LabView-based automation code, building off skills he developed in a previous CCI internship at Sandia.

42 ENGINEERING↗