ELM sputter erosion modeling of a tungsten coated small angle slot divertor in DIII-D

Nuclear Fushion

article

J.N. Brooks¹  T. Sizyuk²  G. Sinclair³  T. Abrams³  A. Hassanein¹ 

[1] Purdue University;Argonne National Laboratory;General Atomics

关键词: tungsten divertor;    ELM sputter erosion;    DIII-D small angle slot divertor;    plasma/surface interaction modeling;   

DOI  :  10.1088/1741-4326/acaf3a

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

We modeled plasma edge localized mode (ELM) sputter erosion for a Small Angle Slot divertor with a tungsten coated region (SAS-VW), designed for experiments in the DIII-D tokamak, and proposed for use in future advanced tokamaks. The simulations use a free-streaming, 1000 eV, C⁺⁶ and D⁺¹ ELM impingement model, with SOLPS-ITER, ITMC-DYN, and REDEP/WBC code packages for background plasma, material response, and erosion/redeposition respectively. The results show ELM'ing plasma gross and net tungsten erosion fluxes of the mixed-material C/W surface peaking at the slot entrance region, and an order of magnitude higher than for non-ELMs. The per-pulse erosion, however, remains low, of order 0.5 nm, due to expected moderate ELM frequencies and duration in DIII-D. The ELMs result in a ∼25 xhigher peak sputtered W current leaving the divertor slot region, towards the core plasma, compared to the ELM-free plasma case. The time-integrated escape current, however, may not significantly affect core plasma high-Z contamination concerns, for a 1% ELM duty factor, but may be an issue for higher frequency ELMs. In general, the modeling results appear favorable for effective testing of the SAS-VW divertor in DIII-D, and extrapolation to innovative divertor designs in future ITER-like and DEMO fusion devices.

【 授权许可】

Unknown