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

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 D 2- ion D + elastic collisions and neutral-neutral collisions on the divertor plasma solution are assessed.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3]
  1. General Atomics, San Diego, CA (United States); Dalian Univ. of Technology, Dalian (People's Republic of China)
  2. Univ. of Toronto, Toronto (Canada)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 2; Related Information: C.F. Sang, P.C. Stangeby, H.Y. Guo, A.W. Leonard, B. Covele, L.L. Lao, A.L. Moser, and D.M. Thomas, "SOLPS Modeling of the Effect on Plasma Detachment of Closing the Lower Divertor in DIII-D", Plasma Phys. control Fusion 59, 025009 (10pp) (2017); Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
University of Toronto, Institute for Aerospace Studies, 4925 Dufferin St. Toronto, M3H5T6, Canada
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; divertor; detachment; modeling; DIII-D
OSTI Identifier:
1372093
Alternate Identifier(s):
OSTI ID: 1336509