The pattern of parallel edge plasma flows due to pressure gradients, recycling, and resonant magnetic perturbations in DIII-D

Frerichs, H.; Schmitz, Oliver; Evans, Todd; Feng, Y.; Reiter, D.

doi:10.1063/1.4926524

Title: The pattern of parallel edge plasma flows due to pressure gradients, recycling, and resonant magnetic perturbations in DIII-D

Journal Article · Mon Jul 13 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4926524· OSTI ID:1375953

Frerichs, H. ^[1]; Schmitz, Oliver ^[1];

^[2]; Feng, Y. ^[3]; Reiter, D. ^[4]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
General Atomics, San Diego, CA (United States)
Max-Planck Inst. for Plasma Physics, Greifswald (Germany)
Forschungszentrum Julich (Germany). Inst. for Energy and Climate Research (IEK) - Plasma Physics

High resolution plasma transport simulations with the EMC3-EIRENE code have been performed to address the parallel plasma flow structure in the boundary of a poloidal divertor configuration with non-axisymmetric perturbations at DIII-D. Simulation results show that a checkerboard pattern of flows with alternating direction is generated inside the separatrix. This pattern is aligned with the position of the main resonances (i.e. where the safety factor is equal to rational values q = m/n for a perturbation field with base mode number n): m pairs of alternating forward and backward flow channel exist for each resonance. The poloidal oscillations are aligned with the subharmonic Melnikov function, which indicates that the plasma flow is generated by parallel pressure gradients along perturbed field lines. Lastly, an additional scrape-off layer-like domain is introduced by the perturbed separatrix which guides field lines from the interior to the divertor targets, resulting in an enhanced outward flow that is consistent with the experimentally observed particle pump-out effect. However, while the lobe structure of the perturbed separatrix is very well reflected in the temperature profile, the same lobes can appear to be smaller in the flow profile due to a competition between high upstream pressure and downstream particle sources driving flows in opposite directions.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; SC0013911

OSTI ID:: 1375953

Alternate ID(s):: OSTI ID: 1228665

Journal Information:: Physics of Plasmas, Vol. 22, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U Frerichs, H.; Schmitz, O.; Waters, I. Physics of Plasmas, Vol. 23, Issue 6, Article No. 062517 https://doi.org/10.1063/1.4954816	journal	June 2016
Helical variation of density profiles and fluctuations in the tokamak pedestal with applied 3D fields and implications for confinement Wilcox, R. S.; Rhodes, T. L.; Shafer, M. W. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5024378	journal	May 2018
3D effects of neon injection positions on the toroidally symmetric/asymmetric heat flux distribution on EAST Liu, B.; Dai, S. Y.; Kawamura, G. Plasma Physics and Controlled Fusion, Vol. 62, Issue 3 https://doi.org/10.1088/1361-6587/ab6072	journal	January 2020
Field aligned flows driven by neutral puffing at MAST Waters, I.; Frerichs, H.; Silburn, S. Nuclear Fusion, Vol. 58, Issue 6 https://doi.org/10.1088/1741-4326/aab7ad	journal	April 2018

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