location: Current position: Home >> Scientific Research >> Paper Publications

Modelling the effect of divertor closure on detachment onset in DIII-D with the SOLPS code

Hits:

Indexed by:期刊论文

Date of Publication:2018-07-01

Journal:CONTRIBUTIONS TO PLASMA PHYSICS

Included Journals:SCIE、CPCI-S

Volume:58

Issue:6-8,SI

Page Number:725-731

ISSN No.:0863-1042

Key Words:closure; detachment; divertor; SOLPS

Abstract:SOLPS modelling has shown that divertor plasma detachment occurs at a lower upstream separatrix density in the more closed DIII-D upper divertor than the open lower divertor, demonstrating the utility of the divertor closure in widening the range of acceptable densities for adequate heat handling. To achieve reduced heat flux and erosion at the plasma-facing components, future devices will need to operate in at least partially detached divertor conditions . Two-dimensional fluid plasma models coupled to Monte Carlo neutral transport simulations, such as SOLPS, have been widely used to predict the onset of detachment. In modelling the DIII-D discharges, the cross-field transport coefficients are constrained to reproduce the experimental upstream profiles. The closed divertor has been modelled with the same input parameters of the open divertor, allowing a direct comparison of the target conditions in both geometries. SOLPS simulations indicate that a higher molecular density correlates strongly with lower electron temperatures. The increased closure of the upper divertor improves the trapping of neutrals, thereby reducing the power density deposited at the target and facilitating detachment, in agreement with experimental observations.

Pre One:Modeling of fuel retention and hydrogen-isotope exchange removal from the pre-damaged tungsten material

Next One:The effects of particle recycling on the divertor plasma: A particle-in-cell with Monte Carlo collision simulation