A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

Ku, S.; Chang, C. S.; Hager, R.; Churchill, R. M.; Tynan, G. R.; Cziegler, I.; Greenwald, M.; Hughes, J.; Parker, S. E.; Adams, M. F.; D'Azevedo, E.; Worley, P.

doi:10.1063/1.5020792

Title: A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

Journal Article · Wed Apr 18 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5020792· OSTI ID:1436764

Ku, S. ^[1];

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^[1]; Churchill, R. M. ^[1]; Tynan, G. R. ^[2];

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^[4];

^[4]; Parker, S. E. ^[5]; Adams, M. F. ^[6];

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California San Diego, La Jolla, CA (United States)
Univ. of California San Diego, La Jolla, CA (United States); Univ. of York, York (United Kingdom)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
Univ. of Colorado, Boulder, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
PHWorley Consulting, Oak Ridge, TN (United States)

© 2018 Author(s). A fast edge turbulence suppression event has been simulated in the electrostatic version of the gyrokinetic particle-in-cell code XGC1 in a realistic diverted tokamak edge geometry under neutral particle recycling. The results show that the sequence of turbulent Reynolds stress followed by neoclassical ion orbit-loss driven together conspire to form the sustaining radial electric field shear and to quench turbulent transport just inside the last closed magnetic flux surface. The main suppression action is located in a thin radial layer around ψ0.96-0.98, where ψNis the normalized poloidal flux, with the time scale ~0.1 ms.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1436764

Alternate ID(s):: OSTI ID: 1433561; OSTI ID: 1465457

Journal Information:: Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 70 works

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