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

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

doi:10.1017/S002237782400045X

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

Journal Article · Mon Apr 22 00:00:00 EDT 2024 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S002237782400045X· OSTI ID:2339901

; Bold, D.; Dudson, B.

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; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2339901

Alternate ID(s):: OSTI ID: 2375425

Report Number(s):: LLNL-JRNL-849204; 905900216; PII: S002237782400045X

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

Publisher:: Cambridge University Press (CUP)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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