Lawrence Livermore National Laboratory (LLNL) scientists and engineers have collected three awards among the top 100 industrial inventions worldwide.
With this year’s results, the Laboratory has now captured a total of 173 R&D 100 awards since 1978.
This year’s Livermore R&D 100 awards include a light-activated switch that could cut carbon emissions by more than 10 percent, an instrument that can be used to assess the threat level posed by a suspected nuclear weapon and next-generation workload management software for high-performance computing.
“Our talented researchers dedicate themselves to solving some of today’s most challenging problems,” said LLNL Director Kim Budil. “These awards serve as recognition that their innovative work has profound impact on industry, our nation and the world.”
Revolutionizing the smart grid
LLNL engineers and their industrial partner, Manteca, Calif.-based Opcondys Inc., shared a R&D 100 award for the Optical Transconductance Varistor (OTV), a light-activated switch that, if fully deployed, could reduce carbon emissions by more than 10 percent.
The OTV device significantly improves upon existing technologies by maintaining higher output power at higher switching frequencies and shorter pulse widths than is possible with other devices.
Shortening the transition from off-to-on and vice versa reduces energy losses to resistive heating for more efficient electricity conversion, with significant economic and environmental benefits.
The OTV is capable of sending high-voltage, direct-current power along grid lines and switching high voltages up to 10 times faster than today’s solid-state devices, something that could cut energy losses in half to save one billion kilowatt-hours of electricity per year. If widely adopted on the grid, the OTV could eliminate 750 million tons of greenhouse gasses annually by 2050.
Powered by laser diodes, the device is made from silicon carbide crystals capable of blocking at least 10-fold higher electric fields than regular silicon. The LLNL-patented technology is being commercialized by Opcondys Inc.
The Livermore OTV team is headed by materials scientist Lars Voss and includes physicist Paulius Grivickas, materials scientist Mihail Bora, optical engineer Hoang Nguyen, electrical engineers Lisa Wang and Rebecca Nikolic, mechanical engineer Craig Brooksby, engineering technical associate Brad Hickman, master opticians Eric Strang and Peter Thelin; electrical engineer Adam Conway, who has since left the Lab; and physicist George Caporaso, project engineer Dave Palmer and mechanical technologist Steve Hawkins, all of whom are now retired.
Detecting nuclear threats
Scientists from LLNL, Radiation Monitoring Devices Inc. of Watertown, Mass., the Johns Hopkins Applied Physics Laboratory and the Defense Threat Reduction Agency have developed an instrument to help emergency response teams quickly identify and assess nuclear threats.
The instrument, known as the Multiplicity Counter for Thermal and Fast Neutrons (MC-TF), uses the technique of neutron multiplicity to measure the quantity and determine the arrangement of any special nuclear material (SNM), such as plutonium and uranium.
The defining quality of SNM is the ability to sustain a fission chain. Fission chains result when neutrons from one fission bump into other nuclei and induce them to fission.
The neutrons that result from a fission chain come out closely spaced in time. They are correlated in time in much the same way raindrops are correlated in time with thunderstorms. Neutrons from SNM come in bursts like intense downpours. In contrast, neutrons from benign sources come in a steady stream, like raindrops in the Pacific Northwest during the winter.
A neutron multiplicity counter like the MC-TF does not simply record that a neutron was counted but also when. This pattern can provide a great deal of information about SNM size and configuration.
A field-deployable technology, the MC-TF leverages 90 state-of-the-art scintillators. Half are meant for fast neutron detection and the other half are for thermal neutron detection.
LLNL physicist Sean Walston collaborated on the development of the MC-TF instrument.
A software that manages workloads
Developed by LLNL computer scientists in collaboration with the University of Tennessee, Knoxville, Flux is a next-generation workload management software framework for supercomputing, high-performance computing (HPC) clusters, cloud servers and laptops.
Flux maximizes scientific throughput by assigning the scientific work requested by HPC users — also known as jobs or workloads — to available resources that complete the work, a method called scheduling.
Using its highly scalable breakthrough approaches of fully hierarchical scheduling and graph-based resource modeling, Flux manages a massive number of processors, memory, graphics processing units and other computing system resources — a key requirement for exascale computing and beyond.
A job is typically expressed in a script that contains a formal specification for resource requests, identifies applications (for instance, multi-physics simulation software to run simultaneously across resources) along with their input data and environment and describes how to deliver the output data.
Modern scientific computing campaigns contain numerous interconnected and dependent tasks with disparate resource requirements. The composition of these numerous interdependent tasks can be spread across many jobs, as well as within each job, and is often referred to as a scientific workflow (as distinct from a single job or workload).
Assigning resources to such modern workflows requires highly scalable scheduling as well as performance communication and coordination across hundreds of thousands of jobs, which could not be accomplished with traditional HPC schedulers. Flux solves this critical problem and has provided innovative solutions for modern workflows for many scientific and engineering disciplines, including COVID-19 modeling, cancer research and drug design, engineering and design optimization and large artificial intelligence workflows.
Workload management software such as Flux is critical for HPC users because it enables efficient execution of user-level applications while simultaneously providing the HPC facility with tools to maximize overall resource utilization.
The Livermore Flux team is led by computer scientist Dong Ahn and includes computer scientists Albert Chu, Jim Garlick, Mark Grondona, Stephen Herbein, Daniel Milroy, Christopher Moussa, Tapasya Patki, Thomas Scogland and Becky Springmeyer.
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