Optimizing detachment control using the magnetic configuration of divertors

Nuclear Fushion

article

C. Cowley¹  B. Lipschultz¹  D. Moulton²  B. Dudson¹ 

[1] York Plasma Institute, University of York;UKAEA-CCFE, Culham Science Centre;Lawrence Livermore National Laboratory

关键词: detachment;    divertors;    edge physics;    advanced divertors;    SOL;    SOLPS;    detachment control;   

DOI  :  10.1088/1741-4326/ac7a4c

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

As tokamak research moves to reactor conditions, the control of a stable, optimally-detached divertor plasma has become increasingly relevant. Simple predictions of such detachment control have been performed previously using the detachment location sensitivity (DLS) model (Lipschultzet al2016Nucl. Fusion56056007). In this study the DLS model is extended and combined with SOLPS-ITER simulations of isolated divertor grids to study the effects of alternate divertor magnetic field properties on detachment control. The DLS model predicts that divertors can achieve easier access to detachment through a long connection length, a high total flux expansion, and a high average magnetic field in the divertor compared with that at thex -point. SOLPS-ITER simulations suggest an even stronger impact of total flux expansion and connection length on detachment access than the DLS model predicts. In terms of detachment evolution, both simulation and modelling show a high gradient in the total magnetic field and low frac{{B}_{mathrm{p}mathrm{o}mathrm{l}}}{B}are able to more easily keep a detachment front at a desired poloidal location. Regions with no stable detachment front locations can arise for high magnetic field gradients directed towards the target. Significant differences have been found between impurity scan simulations and the DLS model. These differences may be attributed to sources and sinks of power and electron pressure, and should be explored further in future work.

【 授权许可】

Unknown