Gyrokinetic benchmark of the electron temperature-gradient instability in the pedestal region

Hassan, Ehab; Hatch, D. R.; Guttenfelder, W.; Chen, Y.; Parker, S.

doi:10.1063/5.0043006

Gyrokinetic benchmark of the electron temperature-gradient instability in the pedestal region

Journal Article · Fri Jun 18 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0043006· OSTI ID:1807267

^[1]; ^[2]; ^[3]; Chen, Y. ^[4]; Parker, S. ^[4]

Univ. of Texas, Austin, TX (United States); Ain Shams Univ., Cairo (Egypt); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Texas, Austin, TX (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Colorado, Boulder, CO (United States)

Transport from turbulence driven by the electron temperature-gradient (ETG) instability is likely a major source of electron heat losses through the pedestal. Due to extreme gradients and strong shaping, ETG instabilities in the pedestal are distinct from those in the core, having, for example, multiple branches (toroidal and slab) in different wavenumber ranges. Due to its importance for pedestal transport, and its rather exotic character, a rigorous multi-code benchmarking exercise is imperative. In this work, we describe such an exercise, wherein we have carried out a detailed comparison of local linear pedestal ETG simulations using three gyrokinetic codes, CGYRO, GEM, and GENE and testing different geometric parameters (such as circular, Miller, and equilibrium EFIT geometry). The resulting linear frequencies, growth rates, and eigenfunctions show very good agreement between the codes in the three types of employed geometries. A nonlinear benchmark between CGYRO and GENE is also described, exhibiting good agreement (a maximum of 20% difference in the heat fluxes computed) at two locations in the pedestal. This lays the foundation for confidently modeling ETG turbulence in the pedestal

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; SC0018148; FG02-04ER54742; SC0018271; SC0017992; AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1807267

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 28; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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