Accelerated architecture of America's fastest supercomputer boosts QCD simulations | 9/21/2018 | Staff
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In pursuit of numerical predictions for exotic particles, researchers are simulating atom-building quark and gluon particles over 70 times faster on Summit, the world's most powerful scientific supercomputer, than on its predecessor Titan at the US Department of Energy's (DOE's) Oak Ridge National Laboratory (ORNL). The interactions of quarks and gluons are computed using lattice quantum chromodynamics (QCD)—a computer-friendly version of the mathematical framework that describes these strong-force interactions.

With new algorithms and optimizations for GPU-based systems like Summit, computational physicists Balint Joo of DOE's Jefferson Lab and Kate Clark of GPU developer NVIDIA are combining two open-source QCD codes, Chroma and the QUDA library for GPUs, on Summit. Located at the Oak Ridge Leadership Computing Facility (OLCF), Summit is a 200-petaflop, IBM AC922 system that launched in June as the top-ranking system on the Top500 list.

Calculations - Particles - Experiment - Advances - QCD

QCD calculations can help reveal elusive, short-lived particles that are difficult to capture in experiment. Advances in QCD applications for this new generation of supercomputing will benefit the team, led by physicist Robert Edwards of Jefferson Lab, in its quest to discover the properties of exotic particles.

"We get predictions from QCD," Joo said. "Where there are theoretical unknowns, computational calculations can give us energy states and particle decays to look for in experiments."

Edwards - Joo - Particle - Accelerator - Experiment

Edwards and Joo work closely with a particle accelerator experiment at Jefferson Lab called GlueX that is bridging theoretical predictions from QCD and experimental evidence.

"GlueX is a flagship experiment of the recently completed $338 million upgrade of the CEBAF Accelerator of Jefferson Lab. The experiment in the new Hall D of the lab is using the electron beam to create an intense polarized photon beam to produce particles, including possibly exotic mesons," Edwards said. "Our QCD computations are informing and guiding these experimental searches."

Team - Access - Summit

The team received early access to Summit to test the...
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