Modeling ExB drift transport in conceptual slot divertor configurations

Meier, E. T.; Covele, B. M.; Guo, H. Y.; Leonard, A. W.; Thomas, D. M.

doi:10.1002/ctpp.201900151

Title: Modeling ExB drift transport in conceptual slot divertor configurations

Journal Article · Sat Feb 15 00:00:00 EST 2020 · Contributions to Plasma Physics

DOI:https://doi.org/10.1002/ctpp.201900151· OSTI ID:1601921

Meier, E. T. ^[1]; Covele, B. M. ^[2]; Guo, H. Y. ^[2]; Leonard, A. W. ^[2]; Thomas, D. M. ^[2]

Univ. of Washington, Seattle, WA (United States)
General Atomics, San Diego, CA (United States)

At DIII-D, a slot divertor concept, called small-angle-slot (SAS), is under development, aiming to enable detachment at relatively low plasma edge density. We report on simulations using the SOLPS-ITER two-dimensional edge code to examine the performance of conceptual “SAS 2” slot configurations. The focus of the analysis is on E × B drift effects on upstream density at detachment (UDD), with detachment marked by electron temperature T_e≤ 3 eV at the outer strike point (OSP). With toroidal field such that radial E × B drift carries particles from the OSP towards the private flux region (PFR), placing the OSP near the inner slot wall gives ≈20% lower UDD than having the OSP near the outer wall. The inner wall effectively traps the radial E × B drift flux, resulting in low T_e and associated radial electric field in the PFR, and thus small losses from the slot to the inner target via poloidal E × B drift flux. With toroidal field reversed such that radial E × B drift is reversed, OSP placement near the inner wall gives ≈10% lower UDD than OSP placement near the outer wall. Although radial E × B flux is from the OSP towards the outer wall, this flux largely escapes the slot, raising the UDD. Finally, a change in the slot shaping is suggested with the goal of eliminating such E × B-driven particle losses from the slot.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Technology Utilization (EE-34); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0019473; FC02-04ER54698

OSTI ID:: 1601921

Alternate ID(s):: OSTI ID: 1599915

Journal Information:: Contributions to Plasma Physics, Vol. 60, Issue 5-6; Conference: Plasma Edge Theory Workshop, San Diego, CA (United States), Aug. 19-21, 2019; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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