SOLPS 5.0 simulations of the high-field side divertor detachment of L-mode plasmas in ASDEX upgrade with convection-dominated radial SOL transport

J. Karhunen; M. Groth

doi:10.1016/j.nme.2019.02.040

SOLPS 5.0 simulations of the high-field side divertor detachment of L-mode plasmas in ASDEX upgrade with convection-dominated radial SOL transport

, J. Karhunen^*, M. Groth

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

SOLPS 5.0 simulations assuming convection-dominated radial ion transport show qualitative and quantitative agreement with measurements of detached high-field side (HFS) divertor conditions for unseeded low-power L-mode plasmas in ASDEX Upgrade, while simultaneously maintaining a reasonable match to the density and temperature measurements at the low-field side (LFS) and HFS midplanes within the scatter of the data. The decreased diffusive transport from the high-density region in the HFS divertor volume across the separatrix into the core enables spatial extension of the high-density front to above the X-point in agreement with spectroscopic measurements. The suppressed ion fuelling from this region into the core plasma allows increasing the neutral D ₂ fuelling to experimental levels, leading to agreement with the measured sub-divertor neutral fluxes within 30%. Detachment of the HFS divertor is observed as a significant decrease of the target ion flux and as reproduction of the characteristic roll-over behaviour of the integrated target ion current at increasing upstream density.

Original language	English
Pages (from-to)	279-286
Number of pages	8
Journal	Nuclear Materials and Energy
Volume	19
DOIs	https://doi.org/10.1016/j.nme.2019.02.040
Publication status	Published - 1 May 2019
MoE publication type	A1 Journal article-refereed

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10.1016/j.nme.2019.02.040

1-s2.0-S2352179118301923-mainFinal published version, 1.82 MBLicence: CC BY-NC-ND

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, & Karhunen, J., & Groth, M. (2019). SOLPS 5.0 simulations of the high-field side divertor detachment of L-mode plasmas in ASDEX upgrade with convection-dominated radial SOL transport. Nuclear Materials and Energy, 19, 279-286. https://doi.org/10.1016/j.nme.2019.02.040

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abstract = "SOLPS 5.0 simulations assuming convection-dominated radial ion transport show qualitative and quantitative agreement with measurements of detached high-field side (HFS) divertor conditions for unseeded low-power L-mode plasmas in ASDEX Upgrade, while simultaneously maintaining a reasonable match to the density and temperature measurements at the low-field side (LFS) and HFS midplanes within the scatter of the data. The decreased diffusive transport from the high-density region in the HFS divertor volume across the separatrix into the core enables spatial extension of the high-density front to above the X-point in agreement with spectroscopic measurements. The suppressed ion fuelling from this region into the core plasma allows increasing the neutral D 2 fuelling to experimental levels, leading to agreement with the measured sub-divertor neutral fluxes within 30{\%}. Detachment of the HFS divertor is observed as a significant decrease of the target ion flux and as reproduction of the characteristic roll-over behaviour of the integrated target ion current at increasing upstream density.",

author = "J. Karhunen and M. Groth and Coster, {D. P.} and D. Carralero and L. Guimarais and V. Nikolaeva and S. Potzel and T. P{\"u}tterich and F. Reimold and A. Scarabosio and E. Viezzer and M. Wischmeier",

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AU - Karhunen, J.

AU - Groth, M.

AU - Coster, D. P.

AU - Carralero, D.

AU - Guimarais, L.

AU - Nikolaeva, V.

AU - Potzel, S.

AU - Pütterich, T.

AU - Reimold, F.

AU - Scarabosio, A.

AU - Viezzer, E.

AU - Wischmeier, M.

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