UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas

Andreas Holm; Mathias Groth; Adam McLean; Filippo Scotti; Thomas D. Rognlien; William H. Meyer; Morgan W. Shafer; Robert S. Wilcox; Eric M. Hollmann

doi:10.1016/j.nme.2022.101337

UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas

Andreas Holm^*, Mathias Groth, Adam McLean, Filippo Scotti, Thomas D. Rognlien, William H. Meyer, Morgan W. Shafer, Robert S. Wilcox, Eric M. Hollmann

^*Corresponding author for this work

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Abstract

UEDGE-CRUMPET simulations indicate the impact of the molecular hydrogenic isotopologue effect under high-recycling LFS divertor conditions in DIII-D to be negligible for electron density and temperature profiles at the LFS target plate. A 30% decrease in molecular content, accompanied by a 10% increase in atomic content, is predicted for deuterium compared to hydrogen. The predicted isotopologue effect on the radiative power balance, validated with calibrated spectroscopy, is found to be small despite a 20% increase in LFS divertor molecular band emission for deuterium compared to hydrogen. The predictions and measurements show a negligible contribution of molecularly-induced atomic and direct molecular emission to the total radiative power balance under high-recycling conditions, consistent with previous EDGE2D-EIRENE investigations. The UEDGE-CRUMPET simulations were performed using effective hydrogen and deuterium rates considering molecular breakup and excitation processes for H₂ and D₂, calculated by the CRUMPET collisional-radiative model.

Original language	English
Article number	101337
Journal	Nuclear Materials and Energy
Volume	34
DOIs	https://doi.org/10.1016/j.nme.2022.101337
Publication status	Published - Mar 2023
MoE publication type	A1 Journal article-refereed

Keywords

Balmer-alpha
Collisional-radiative
CRUMPET
DIII-D
Edge-fluid simulations
Fulcher
Isotope effect
Lyman-alpha
Lyman–Werner
Molecules
UEDGE

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@article{b9145e1dd1964017bad32647e2b13e5a,

title = "UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas",

abstract = "UEDGE-CRUMPET simulations indicate the impact of the molecular hydrogenic isotopologue effect under high-recycling LFS divertor conditions in DIII-D to be negligible for electron density and temperature profiles at the LFS target plate. A 30% decrease in molecular content, accompanied by a 10% increase in atomic content, is predicted for deuterium compared to hydrogen. The predicted isotopologue effect on the radiative power balance, validated with calibrated spectroscopy, is found to be small despite a 20% increase in LFS divertor molecular band emission for deuterium compared to hydrogen. The predictions and measurements show a negligible contribution of molecularly-induced atomic and direct molecular emission to the total radiative power balance under high-recycling conditions, consistent with previous EDGE2D-EIRENE investigations. The UEDGE-CRUMPET simulations were performed using effective hydrogen and deuterium rates considering molecular breakup and excitation processes for H2 and D2, calculated by the CRUMPET collisional-radiative model.",

keywords = "Balmer-alpha, Collisional-radiative, CRUMPET, DIII-D, Edge-fluid simulations, Fulcher, Isotope effect, Lyman-alpha, Lyman–Werner, Molecules, UEDGE",

author = "Andreas Holm and Mathias Groth and Adam McLean and Filippo Scotti and Rognlien, {Thomas D.} and Meyer, {William H.} and Shafer, {Morgan W.} and Wilcox, {Robert S.} and Hollmann, {Eric M.}",

note = "Funding Information: This work was supported by US DOE under contract nos. DE-FC02-04ER54698, DE-AC52-07NA27344, and DE-AC05-00OR22725. This work was supported by the Academy of Finland under grant no. 13330050. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Funding Information: This work was supported by US DOE under contract nos. DE-FC02-04ER54698 , DE-AC52-07NA27344 , and DE-AC05-00OR22725 . This work was supported by the Academy of Finland under grant no. 13330050 . Publisher Copyright: {\textcopyright} 2023 The Authors",

year = "2023",

month = mar,

doi = "10.1016/j.nme.2022.101337",

language = "English",

volume = "34",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier Science",

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AU - Holm, Andreas

AU - Groth, Mathias

AU - McLean, Adam

AU - Scotti, Filippo

AU - Rognlien, Thomas D.

AU - Meyer, William H.

AU - Shafer, Morgan W.

AU - Wilcox, Robert S.

AU - Hollmann, Eric M.

N1 - Funding Information: This work was supported by US DOE under contract nos. DE-FC02-04ER54698, DE-AC52-07NA27344, and DE-AC05-00OR22725. This work was supported by the Academy of Finland under grant no. 13330050. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Funding Information: This work was supported by US DOE under contract nos. DE-FC02-04ER54698 , DE-AC52-07NA27344 , and DE-AC05-00OR22725 . This work was supported by the Academy of Finland under grant no. 13330050 . Publisher Copyright: © 2023 The Authors

PY - 2023/3

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N2 - UEDGE-CRUMPET simulations indicate the impact of the molecular hydrogenic isotopologue effect under high-recycling LFS divertor conditions in DIII-D to be negligible for electron density and temperature profiles at the LFS target plate. A 30% decrease in molecular content, accompanied by a 10% increase in atomic content, is predicted for deuterium compared to hydrogen. The predicted isotopologue effect on the radiative power balance, validated with calibrated spectroscopy, is found to be small despite a 20% increase in LFS divertor molecular band emission for deuterium compared to hydrogen. The predictions and measurements show a negligible contribution of molecularly-induced atomic and direct molecular emission to the total radiative power balance under high-recycling conditions, consistent with previous EDGE2D-EIRENE investigations. The UEDGE-CRUMPET simulations were performed using effective hydrogen and deuterium rates considering molecular breakup and excitation processes for H2 and D2, calculated by the CRUMPET collisional-radiative model.

AB - UEDGE-CRUMPET simulations indicate the impact of the molecular hydrogenic isotopologue effect under high-recycling LFS divertor conditions in DIII-D to be negligible for electron density and temperature profiles at the LFS target plate. A 30% decrease in molecular content, accompanied by a 10% increase in atomic content, is predicted for deuterium compared to hydrogen. The predicted isotopologue effect on the radiative power balance, validated with calibrated spectroscopy, is found to be small despite a 20% increase in LFS divertor molecular band emission for deuterium compared to hydrogen. The predictions and measurements show a negligible contribution of molecularly-induced atomic and direct molecular emission to the total radiative power balance under high-recycling conditions, consistent with previous EDGE2D-EIRENE investigations. The UEDGE-CRUMPET simulations were performed using effective hydrogen and deuterium rates considering molecular breakup and excitation processes for H2 and D2, calculated by the CRUMPET collisional-radiative model.

KW - Balmer-alpha

KW - Collisional-radiative

KW - CRUMPET

KW - DIII-D

KW - Edge-fluid simulations

KW - Fulcher

KW - Isotope effect

KW - Lyman-alpha

KW - Lyman–Werner

KW - Molecules

KW - UEDGE

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U2 - 10.1016/j.nme.2022.101337

DO - 10.1016/j.nme.2022.101337

M3 - Article

AN - SCOPUS:85147198923

SN - 2352-1791

VL - 34

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101337

ER -

UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas

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New Study Findings from Aalto University Illuminate Research in Nuclear Materials and Energy (UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas)

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UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas

Abstract

Keywords

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MoPEF: Molecules and Photons in the edge of fusion plasmas

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New Study Findings from Aalto University Illuminate Research in Nuclear Materials and Energy (UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas)

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