SOLPS-ITER simulations of high power exhaust for CFETR divertor with full drifts

Nuclear Fushion

article

Hang Si¹  Rui Ding¹  Ilya Senichenkov²  Vladimir Rozhansky²  Pavel Molchanov²  Xiaoju Liu¹  Guozhang Jia¹  Chaofeng Sang³  Shifeng Mao⁴  Vincent Chan⁴ 

[1] Institute of Plasma Physics Chinese Academy of Sciences;Peter the Great Saint Petersburg Polytechnic University;Dalian University of Technology;University of Science and Technology of China

关键词: divertor;    power handling;    modeling;    CFETR;   

DOI  :  10.1088/1741-4326/ac3f4b

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

One of the major challenges for the Gigawatt-class Chinese Fusion Engineering Testing Reactor (CFETR) is to efficiently handle huge power fluxes on plasma-facing components , especially the divertor targets. This work investigates the effects of two candidate radiation impurity species, argon (Ar) and neon (Ne), with two different divertor geometries (baseline and long leg divertor geometry) on the reduction of steady-state power load to divertor targets in CFETR by using the SOLPS-ITER code package with full drifts and kinetic description of neutrals. The modeling results show clearly that increasing the seeding rate of Ar or Ne with fixed fueling gas D₂ injection rate reduces the target electron temperature and heat flux density for the baseline divertor geometry, which can be reduced further by higher D₂ injection rate. With a high impurity seeding rate, partial detachment with steady-state power load at the divertor target below the engineering limit of 10 MW m⁻² is demonstrated. In addition, the radiation efficiency for Ar is better than that for Ne. Increasing the divertor leg length reduces the electron temperature and heat load at the targets. This modeling, therefore, suggests that a long leg divertor design with Ar seeding impurity is appropriate to meet the CFETR divertor requirements.

【 授权许可】

Unknown