Comparison of DIVIMP and EDGE2D-EIRENE tungsten transport predictions in JET edge plasmas

H. A. Kumpulainen; M. Groth; M. Fontell; A. E. Jaervinen; G. Corrigan; D. Harting

doi:10.1016/j.nme.2020.100784

Comparison of DIVIMP and EDGE2D-EIRENE tungsten transport predictions in JET edge plasmas

H. A. Kumpulainen^*, M. Groth, M. Fontell, A. E. Jaervinen, G. Corrigan, D. Harting

^*Corresponding author for this work

Not published at VTT

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Abstract

The average tungsten concentrations in the pedestal region (c_W) predicted by the Monte Carlo code DIVIMP and the coupled multi-fluid plasma/kinetic neutral code EDGE2D-EIRENE are found to agree within a factor of 2 for a range of JET-ILW L-mode and H-mode plasma conditions. Under attached divertor conditions with c_W exceeding 10⁻⁶, the c_W predicted by DIVIMP is consistently ~50% higher than by EDGE2D-EIRENE. In colder plasma scenarios with c_W <10^-6, stochastic variations exceed the systematic disagreement between the two codes. The average tungsten charge predicted by EDGE2D-EIRENE in the upstream scrape-off layer is lower by 40–50% due to the bundling of the 74 tungsten ion charge states into 6 fluid species, which explains the reduced tungsten accumulation in the main plasma compared to the DIVIMP predictions.

Original language	English
Article number	100784
Journal	Nuclear Materials and Energy
Volume	25
DOIs	https://doi.org/10.1016/j.nme.2020.100784
Publication status	Published - Dec 2020
MoE publication type	A1 Journal article-refereed

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Keywords

Code validation
Impurity transport
Joint European Torus
Monte Carlo simulation
Scrape-off layer
Tungsten

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2020.100784Licence: CC BY

Cite this

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title = "Comparison of DIVIMP and EDGE2D-EIRENE tungsten transport predictions in JET edge plasmas",

abstract = "The average tungsten concentrations in the pedestal region (cW) predicted by the Monte Carlo code DIVIMP and the coupled multi-fluid plasma/kinetic neutral code EDGE2D-EIRENE are found to agree within a factor of 2 for a range of JET-ILW L-mode and H-mode plasma conditions. Under attached divertor conditions with cW exceeding 10−6, the cW predicted by DIVIMP is consistently \textasciitilde{}50\% higher than by EDGE2D-EIRENE. In colder plasma scenarios with cW <10-6, stochastic variations exceed the systematic disagreement between the two codes. The average tungsten charge predicted by EDGE2D-EIRENE in the upstream scrape-off layer is lower by 40–50\% due to the bundling of the 74 tungsten ion charge states into 6 fluid species, which explains the reduced tungsten accumulation in the main plasma compared to the DIVIMP predictions.",

keywords = "Code validation, Impurity transport, Joint European Torus, Monte Carlo simulation, Scrape-off layer, Tungsten",

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note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: {\textcopyright} 2020",

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doi = "10.1016/j.nme.2020.100784",

language = "English",

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AU - Kumpulainen, H. A.

AU - Groth, M.

AU - Fontell, M.

AU - Jaervinen, A. E.

AU - Corrigan, G.

AU - Harting, D.

N1 - Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: © 2020

PY - 2020/12

Y1 - 2020/12

N2 - The average tungsten concentrations in the pedestal region (cW) predicted by the Monte Carlo code DIVIMP and the coupled multi-fluid plasma/kinetic neutral code EDGE2D-EIRENE are found to agree within a factor of 2 for a range of JET-ILW L-mode and H-mode plasma conditions. Under attached divertor conditions with cW exceeding 10−6, the cW predicted by DIVIMP is consistently ~50% higher than by EDGE2D-EIRENE. In colder plasma scenarios with cW <10-6, stochastic variations exceed the systematic disagreement between the two codes. The average tungsten charge predicted by EDGE2D-EIRENE in the upstream scrape-off layer is lower by 40–50% due to the bundling of the 74 tungsten ion charge states into 6 fluid species, which explains the reduced tungsten accumulation in the main plasma compared to the DIVIMP predictions.

AB - The average tungsten concentrations in the pedestal region (cW) predicted by the Monte Carlo code DIVIMP and the coupled multi-fluid plasma/kinetic neutral code EDGE2D-EIRENE are found to agree within a factor of 2 for a range of JET-ILW L-mode and H-mode plasma conditions. Under attached divertor conditions with cW exceeding 10−6, the cW predicted by DIVIMP is consistently ~50% higher than by EDGE2D-EIRENE. In colder plasma scenarios with cW <10-6, stochastic variations exceed the systematic disagreement between the two codes. The average tungsten charge predicted by EDGE2D-EIRENE in the upstream scrape-off layer is lower by 40–50% due to the bundling of the 74 tungsten ion charge states into 6 fluid species, which explains the reduced tungsten accumulation in the main plasma compared to the DIVIMP predictions.

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KW - Impurity transport

KW - Joint European Torus

KW - Monte Carlo simulation

KW - Scrape-off layer

KW - Tungsten

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JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

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ER -

Comparison of DIVIMP and EDGE2D-EIRENE tungsten transport predictions in JET edge plasmas

Abstract

Funding

Keywords

UN SDGs

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