Time-dependent collisional radiative modeling of tungsten in the magnetic sheath for erosion diagnosis

Nuclear Fushion

article

C.A. Johnson¹  D.A. Ennis¹  S.D. Loch¹  C.P. Ballance³ 

[1] Auburn University;Oak Ridge Institute for Science and Education;Queens University Belfast

关键词: tungsten;    S/XB;    ColRadPy;    collisional radiative;    metastable state;    erosion;   

DOI  :  10.1088/1741-4326/ace3d9

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

Tungsten is the material of choice for the divertors in ITER, SPARC and future fusion reactors. Accurate diagnosis of tungsten erosion and migration is important for first wall life time, slag production and core performance. The addition of a magnetic presheath requires time-dependent collisional radiative effects to be included for accurate neutral tungsten collisional radiative modeling. Gross erosion measurements could be modified by a factor of 10 due to the inclusion of time-dependent effects for ITER relevant divertor conditions. A simple sputtering model and sheath density model are developed to investigate time-dependent collisional radiative effects. Neutral tungsten spectral lines populated from different metastable levels depend on model parameters leading to potential spectroscopic diagnostics of plasma parameters. Electron temperatures inferred from spectroscopic line ratios are in agreement with Langmuir probe measurements in the Compact Toroidal Hybrid.

【 授权许可】

Unknown