Modeling, Simulations, & High-Performance Computing

As home of one of the nation’s most advanced environments for high-performance computing (HPC), modeling, and simulation, LLE enables scientists to understand and predict the behavior of matter under extreme conditions. These capabilities are essential for advancing fusion research, stockpile stewardship, and high-energy-density physics—while training the next generation of computational scientists.

Experiments on powerful laser facilities like OMEGA generate vast amounts of data about plasmas, shocks, and materials compressed to pressures found inside stars and planets. To complement those experiments, LLE leverages state-of-the-art supercomputers, modern software, and advanced simulation frameworks allowing researchers to:

Recreate conditions too rare or extreme to measure directly in the lab
Explore parameter spaces and optimize experimental designs efficiently
Predict the performance of fusion targets and laser systems with high precision

Modeling and simulation serve as a bridge between theory and experiment, helping scientists test hypotheses, reduce costs, and accelerate discovery.

Advanced Computational Modeling for ICF

LLE is a world leader in multiphysics modeling for direct-drive inertial confinement fusion (ICF). ICF implosions, like a supernova explosion, are rich in physics, combining thermonuclear fusion processes, radiation, thermal conduction, and laser–plasma coupling with complex material properties.

Working in 1D, 2D, and 3D, we are continually improving codes to model our experiments. Some current development projects include the addition of a broadband laser capability in draco (2D); improved laser–coupling modeling in Lawrence Livermore National Laboratory’s (LLNL’s) code hydra (1D through 3D) in collaboration with LLNL; and developing a new higher-order code, cygnus, written in MIT’s Julia language.

Designing for Broadband Laser-Driven ICF

Recent investigations have demonstrated that a broadband laser can couple significantly more energy to an imploding target than a single-frequency laser. LLE’s integrated modeling capabilities explore designs for use with broadband lasers for future facilities at 250-kJ and 3-MJ driver energies and are collaborating on FLUX experiments, which will measure the impact of broadband lasers on both laser imprint and laser–plasma interactions.

Design, Modeling, and Analysis of ICF Experiments

Integrated modeling capabilities support the planning, execution, and analysis of experiments on OMEGA, OMEGA EP, and the National Ignition Facility. These efforts include optimization of cryogenic implosions, targeted studies of key physical processes, statistical modeling based on extensive 2D implosion data, and the use of experimental results to advance diagnostic development and target design techniques.

Target Microstructure and ICF

Heterogeneous materials, such as plastic foams saturated with deuterium–tritium fuel, offer significant advantages over traditional solid-shell targets: Designers can optimize for laser absorption and in-flight stability by tuning the structure of the plastic foam. These materials, which can be 3D printed, provide a potential advantage in terms of manufacture. Both experiments (NIF and OMEGA) and modeling are being used to explore the properties of these materials and develop them for future use in ICF.

Plasma-Physics Simulations

Detailed modeling of instabilities, turbulence, and laser–plasma interactions enables researchers to design experiments that improve performance and stability.

Simulations of Materials Under Extreme Conditions

Simulations reveal how matter responds at millions of atmospheres of pressure, informing both planetary science and national security applications.

Conesus supercomputer at the University of Rochester.

Meet Conesus, a Top 500 Energy-Efficient Supercomputer

Conesus, optimized for large-scale physics simulations, features:

Parallel processing power to run multidimensional models spanning billions of grid points
High-throughput storage to handle massive simulation outputs
Advanced visualization tools that allow scientists to interpret and communicate complex phenomena

This infrastructure is continuously upgraded to match the demands of larger, more sophisticated models and the data rates from world-class laser experiments.

More about Conesus

Students receive hands-on training in HPC and modeling, gaining skills that are critical for careers in government, academia, and the private sector.