Global fluid turbulence simulations in the scrape-off layer of a stellarator island divertor

Shanahan, B.; Bold, D.; Dudson, B.

doi:10.1017/s002237782400045x

Title: Global fluid turbulence simulations in the scrape-off layer of a stellarator island divertor

Journal Article · 22 April 2024 · Journal of Plasma Physics

DOI: https://doi.org/10.1017/s002237782400045x · OSTI ID:2339901

^[1]; Bold, D. ^[1]; Dudson, B. ^[2]

Max Planck Institute for Plasma Physics, Greifswald (Germany)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Isothermal fluid turbulence simulations have been performed in the edge and scrape-off layer (SOL) of an analytic stellarator configuration with an island divertor, thereby providing numerical insight into edge turbulence in regions around islands in a stellarator. The steady-state transport follows the a curvature drive that is inverse to the major radius (1/R) toward the outboard side, but large fluctuations are present throughout the island divertor region, with the average wavelength of similar size to the island width. The system exhibits a prominent m = 2, n = 5 mode, where m is the poloidal mode number and n is the toroidal mode number, although other modes are present. The amplitude and radial extent of the density fluctuations are similar throughout the edge and SOL, but can decrease near island O-points. The fluctuations exhibit a predominantly positive skewness on the outboard midplane, indicating blob-like perturbations for the transport into the outer SOL. It is determined that a point on the separatrix is generally more correlated with regions outside of the SOL than a nearby reference point which does not lie on the separatrix.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; AC52-07NA27344. LLNL-JRNL-849204

OSTI ID:: 2339901

Alternate ID(s):: OSTI ID: 2375425

Report Number(s):: LLNL-JRNL-849204; 1074769; TRN: US2500350

Journal Information:: Journal of Plasma Physics, Vol. 90, Issue 2; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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