Oak Ridge National Laboratory (ORNL), U.S. Dept. of Energy
The prospect of simulating a fusion plasma is a step closer to reality thanks to a new computational tool developed by scientists in fusion physics, computer science and mathematics at Oak Ridge National Laboratory.
Harnessing fusion power on Earth requires strong magnetic fields to hold and squeeze a super-heated gas, and the large scale experiments capable of such extreme conditions can take decades to build.
Through simulation, a team led by ORNL's David Green hopes to perform virtual investigations of how fusion devices behave using high-performance computing.
"The mathematics underlying a fusion plasma are so complex that traditional approaches test the limits of even today's largest supercomputers," Green said. The team has tested a new approach on ORNL's Summit supercomputer and they expect that its combination with ORNL's upcoming exascale Frontier supercomputer will make a virtual fusion device possible.
Machine learning for analysis of atomic spectral data
M Cianciosa, KJH Law, EH Martin, DL Green
Journal of Quantitative Spectroscopy and Radiative (2020)
DOI: 10.1016/j.jqsrt.2019.106671
Contact information:
David L Green
greendl1@ornl.gov
Phone: 865.241.2752
Researchers at the University of Basel have identified and coherently controlled so called forbidden vibrational transitions in individual trapped nitrogen molecular ions without destroying them. Using quantum logic spectroscopy, a single calcium ion served as messenger, letting the team probe the molecule repeatedly and determine its fundamental vibrational frequency ten times more precisely than before.
Odd-parity magnets host an intrinsic hidden Zeeman field that lifts Kramers degeneracy without any applied field, researchers report. Using an f-wave magnet model on a triangular lattice, the team shows how non-relativistic spin splitting and this hidden field combine to stabilize s-wave superconductivity far beyond the Pauli limit.
Rhombohedral hexalayer graphene, in which six carbon sheets are stacked with a slight lateral offset like staircase steps, hosts both superconductivity and electrically controllable orbital magnetism, researchers report in Nature Physics. The arrangement yields a rich collection of quantum states in a simple carbon-based material, positioning rhombohedral multilayer graphene as a platform for probing the fundamental mechanisms of superconductivity and magnetism and potentially for new ways of…
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