Validation of SOLPS-ITER simulations with kinetic, fluid, and hybrid neutral models for JET-ILW low-confinement mode plasmas

被引：10

作者：

Horsten, N. ^{[1
,2
]}

Groth, M. ^{[2
]}

Dekeyser, W. ^{[1
]}

Van Uytven, W. ^{[1
]}

Aleiferis, S. ^{[3
]}

Carli, S. ^{[1
]}

Karhunen, J. ^{[3
]}

Lawson, K. D. ^{[3
]}

Lomanowski, B. ^{[4
]}

Meigs, A. G. ^{[3
]}

Menmuir, S. ^{[3
]}

Shaw, A. ^{[3
]}

Solokha, V. ^{[2
]}

Thomas, B. ^{[3
]}

机构：

[1] Katholieke Univ Leuven, Dept Mech Engn, Celestijnenlaan 300A, B-3001 Leuven, Belgium

[2] Aalto Univ, Dept Appl Phys, Espoo, Finland

[3] UKAEA, Culham Sci Ctr, Abingdon OX14 3DB, England

[4] Oak Ridge Natl Lab, Oak Ridge, TN USA

来源：

NUCLEAR MATERIALS AND ENERGY | 2022年 / 33卷

关键词：

Plasma edge modeling; Neutral models; Code validation; JET; DIVERTOR SPECTROSCOPY; TRANSPORT; PROFILES; TARGET;

D O I：

10.1016/j.nme.2022.101247

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

For JET L-mode plasmas in low-recycling conditions (electron temperature at the outer strike point, T-e,T-ot >= 30 eV), SOLPS-ITER simulations agree within the error bars for the experimental profiles at the low-field side (LFS) divertor target. The peak Balmer-alpha (D-alpha) emission in the LFS divertor agrees within the error bars of the KS3 filterscope diagnostic, but is approximately 30% lower than the peak value of the KT1 spectrometer. Simulations have been performed with fluid, kinetic, and hybrid models for the neutrals. The large fluid-kinetic discrepancies of more than a factor 2 are successfully corrected by using a hybrid fluid-kinetic approach, for which kinetic atoms are transferred to the fluid population when the local Knudsen number of the atom becomes smaller than a user-defined transition Knudsen number Kn(t). The hybrid-kinetic discrepancies are limited to a few % for Kn(t) <= 100. When increasing the upstream density to high-recycling conditions, at the onset of detachment (T-e,T-ot asymptotic to 5 eV), the simulations predict more than a factor 2 lower peak ion saturation current to the LFS divertor than the experiments. Also the D-alpha emission is underpredicted with approximately a factor 2. For these high-recycling conditions, the fluid-kinetic discrepancies are limited to maximum 50%, which are again corrected by using the hybrid approach.

引用

页数：9

共 38 条

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