SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D

Sang, C. F.; Stangeby, P. C.; Guo, H. Y.; Leonard, A. W.; Covele, B.; Lao, L. L.; Moser, A. L.; Thomas, D. M.

doi:10.1088/1361-6587/59/2/025009

SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D

Journal Article · Thu Dec 15 00:00:00 EST 2016 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/59/2/025009· OSTI ID:1372093

Sang, C. F. ^[1]; Stangeby, P. C. ^[2]; Guo, H. Y. ^[3]; Leonard, A. W. ^[3]; Covele, B. ^[3]; Lao, L. L. ^[3]; Moser, A. L. ^[3]; Thomas, D. M. ^[3]

General Atomics, San Diego, CA (United States); Dalian Univ. of Technology, Dalian (People's Republic of China); Gnereal Atomics
Univ. of Toronto, Toronto (Canada)
General Atomics, San Diego, CA (United States)

SOLPS modeling has been carried out to assess the effect of tightly closing the lower divertor in DIII-D, which at present is almost fully open, on the achievement of cold dissipative/detached divertor conditions. To isolate the impact of other factors on the divertor plasma solution and to make direct comparisons, most of the parameters including the meshes were kept as similar as possible. Only the neutral baffling was modified to compare a fully open divertor with a tightly closed one. The modeling shows that the tightly closed divertor greatly improves trapping of recycling neutrals, thereby increasing radiative and charge exchange losses in the divertor and reducing the electron temperature T_et and deposited power density q_dep at the target plate. Furthermore, the closed structure enables the divertor plasma to enter into highly dissipative and detached divertor conditions at a significantly lower upstream density. The effects of divertor closure on the neutral density and pressure, and their correlation with the divertor plasma conditions are also demonstrated. The effect of molecular D₂- ion D⁺ elastic collisions and neutral-neutral collisions on the divertor plasma solution are assessed.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Contributing Organization:: University of Toronto, Institute for Aerospace Studies, 4925 Dufferin St. Toronto, M3H5T6, Canada

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1372093

Alternate ID(s):: OSTI ID: 1336509
OSTI ID: 22718202

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 2 Vol. 59; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D

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