Verification of 5D continuum gyrokinetic code COGENT: Studies of kinetic drift wave instability

Lee, Wonjae; Dorf, M. A.; Dorr, M. R.; Cohen, R. H.; Rognlien, T. D.; Hittinger, J. A.  F.; Umansky, M. V.; Krasheninnikov, S. I.

doi:10.1002/ctpp.201700161

Title: Verification of 5D continuum gyrokinetic code COGENT: Studies of kinetic drift wave instability

Journal Article · Tue Apr 10 00:00:00 EDT 2018 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201700161· OSTI ID:1476212

Lee, Wonjae ^[1]; Dorf, M. A. ^[2]; Dorr, M. R. ^[3]; Cohen, R. H. ^[4]; Rognlien, T. D. ^[2]; Hittinger, J. A. F. ^[3]; Umansky, M. V. ^[2]; Krasheninnikov, S. I. ^[1]

Univ. of California, San Diego, CA (United States). Mechanical and Aerospace Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Fusion Energy Science Program
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Fusion Energy Science Program. Center for Applied Scientific Computing
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

COGENT (Continuum Gyrokinetic Edge New Technology) is a kinetic plasma simulation code that is being developed by the edge simulation laboratory (ESL) collaboration. The original version of the code has been developed in a 4D phase space (2D configuration space and 2D velocity space) to address kinetic plasma phenomena in a complex magnetic field geometry including the core, magnetic separatrix, and scrape-off layer regions. This paper is focused on extending the original 4D phase space to a 5D phase space (3D2V) to address full kinetic turbulences in a tokamak edge region. Here, we report on the current status of 5D COGENT, which presently operates in a shear-less, simple slab geometry. As a verification study, we use the problems of collision-less drift wave instability (universal instability) including its modification in the presence of collisional effects. The simulation model includes the gyrokinetic equations for ion and electron species coupled to the long-wavelength limit of the gyro-Poisson equation. Collisional effects are represented by the Krook collision model. Linear analytical results for the drift mode growth rate and real frequency are recovered, and the non-linear stage is modelled and analysed as well. In addition, extensive 5D runs have been performed to address the effects of the drift wave instability on blob/filamentary structures characteristic of a tokamak edge. Finally, a helical-shaped potential perturbation is observed to grow exponentially in time while spinning around the filament axis with electron drift frequency.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, San Diego, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344; FG02-04ER54739; SC0016548

OSTI ID:: 1476212

Alternate ID(s):: OSTI ID: 1432721

Report Number(s):: LLNL-JRNL-746119; 930713

Journal Information:: Contributions to Plasma Physics, Vol. 58, Issue 6-8; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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References (8)

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