EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

JET Contributors

doi:10.1016/j.nme.2022.101273

EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

JET Contributors

Power Exhaust and Particle Control

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Abstract

EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET L-mode plasmas show that the divertor N I to N V radiation distributions are highly sensitive to the upstream electron density, and less sensitive to changes in the assumed cross-field particle diffusivity for nitrogen ions. The EDGE2D-EIRENE simulations reproduce the peak intensities of N I to N V as measured by vertically viewing divertor filterscopes to within 50 % for a narrow range of the upstream electron density within the experimental uncertainties, while the predicted profiles are narrower than the measured ones. Including nitrogen atoms only in the ERO2.0 simulations implies lower N III and N IV peak intensities by one and two thirds, respectively, compared to EDGE2D-EIRENE. If nitrogen is assumed to recycle exclusively as molecules instead of atoms, ERO2.0 predicts that the N III and N IV intensities in the divertor increase by up to a factor of two and that the time-averaged, volume-integrated number of N⁵⁺ to N⁷⁺ ions in the plasma also increases by approximately a factor of 2.

Original language	English
Article number	101273
Journal	Nuclear Materials and Energy
Volume	33
DOIs	https://doi.org/10.1016/j.nme.2022.101273
State	Published - Oct 2022

Funding

This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work made use of the Triton cluster, part of the Science-IT project at Aalto University. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work made use of the Triton cluster, part of the Science-IT project at Aalto University.

Funders	Funder number
European Commission	101052200 — EUROfusion
Aalto-Yliopisto

Keywords

EDGE2D-EIRENE
ERO2.0
JET
Nitrogen emission

UN SDGs

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

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10.1016/j.nme.2022.101273

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title = "EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas",

abstract = "EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET L-mode plasmas show that the divertor N I to N V radiation distributions are highly sensitive to the upstream electron density, and less sensitive to changes in the assumed cross-field particle diffusivity for nitrogen ions. The EDGE2D-EIRENE simulations reproduce the peak intensities of N I to N V as measured by vertically viewing divertor filterscopes to within 50 % for a narrow range of the upstream electron density within the experimental uncertainties, while the predicted profiles are narrower than the measured ones. Including nitrogen atoms only in the ERO2.0 simulations implies lower N III and N IV peak intensities by one and two thirds, respectively, compared to EDGE2D-EIRENE. If nitrogen is assumed to recycle exclusively as molecules instead of atoms, ERO2.0 predicts that the N III and N IV intensities in the divertor increase by up to a factor of two and that the time-averaged, volume-integrated number of N5+ to N7+ ions in the plasma also increases by approximately a factor of 2.",

keywords = "EDGE2D-EIRENE, ERO2.0, JET, Nitrogen emission",

author = "{JET Contributors} and R. M{\"a}enp{\"a}{\"a} and H. Kumpulainen and M. Groth and J. Romazanov and B. Lomanowski and S. Brezinsek and {Di Genova}, S. and J. Karhunen and K. Lawson and Meigs, {A. G.} and S. Menmuir and A. Shaw",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors",

year = "2022",

month = oct,

doi = "10.1016/j.nme.2022.101273",

language = "English",

volume = "33",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

TY - JOUR

T1 - EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

AU - JET Contributors

AU - Mäenpää, R.

AU - Kumpulainen, H.

AU - Groth, M.

AU - Romazanov, J.

AU - Lomanowski, B.

AU - Brezinsek, S.

AU - Di Genova, S.

AU - Karhunen, J.

AU - Lawson, K.

AU - Meigs, A. G.

AU - Menmuir, S.

AU - Shaw, A.

PY - 2022/10

Y1 - 2022/10

N2 - EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET L-mode plasmas show that the divertor N I to N V radiation distributions are highly sensitive to the upstream electron density, and less sensitive to changes in the assumed cross-field particle diffusivity for nitrogen ions. The EDGE2D-EIRENE simulations reproduce the peak intensities of N I to N V as measured by vertically viewing divertor filterscopes to within 50 % for a narrow range of the upstream electron density within the experimental uncertainties, while the predicted profiles are narrower than the measured ones. Including nitrogen atoms only in the ERO2.0 simulations implies lower N III and N IV peak intensities by one and two thirds, respectively, compared to EDGE2D-EIRENE. If nitrogen is assumed to recycle exclusively as molecules instead of atoms, ERO2.0 predicts that the N III and N IV intensities in the divertor increase by up to a factor of two and that the time-averaged, volume-integrated number of N5+ to N7+ ions in the plasma also increases by approximately a factor of 2.

AB - EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET L-mode plasmas show that the divertor N I to N V radiation distributions are highly sensitive to the upstream electron density, and less sensitive to changes in the assumed cross-field particle diffusivity for nitrogen ions. The EDGE2D-EIRENE simulations reproduce the peak intensities of N I to N V as measured by vertically viewing divertor filterscopes to within 50 % for a narrow range of the upstream electron density within the experimental uncertainties, while the predicted profiles are narrower than the measured ones. Including nitrogen atoms only in the ERO2.0 simulations implies lower N III and N IV peak intensities by one and two thirds, respectively, compared to EDGE2D-EIRENE. If nitrogen is assumed to recycle exclusively as molecules instead of atoms, ERO2.0 predicts that the N III and N IV intensities in the divertor increase by up to a factor of two and that the time-averaged, volume-integrated number of N5+ to N7+ ions in the plasma also increases by approximately a factor of 2.

KW - EDGE2D-EIRENE

KW - ERO2.0

KW - JET

KW - Nitrogen emission

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U2 - 10.1016/j.nme.2022.101273

DO - 10.1016/j.nme.2022.101273

M3 - Article

AN - SCOPUS:85140801071

SN - 2352-1791

VL - 33

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101273

ER -

EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

Abstract

Funding

Keywords

UN SDGs

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