Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas

JET Contributors

doi:10.1016/j.nme.2025.101893

Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas

JET Contributors

Power Exhaust and Particle Control

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

Abstract

Spectroscopic measurements of the hydrogenic Balmer-α and Balmer-γ line emission in JET-ILW low-confinement mode (L-mode) deuterium plasmas are used to assess the onset of volume recombination in the low-field side (LFS) divertor. The evolution of the EDGE2D-EIRENE predicted Balmer-γ to Balmer-α emission ratio from low-recycling to detached conditions is in qualitative agreement with the measured ratio. In low-recycling conditions the EDGE2D-EIRENE predicted line-emission is within 30% of measured emission, in high-recycling within 20%t, and in detached conditions lower by a factor of 2.5.

Original language	English
Article number	101893
Journal	Nuclear Materials and Energy
Volume	42
DOIs	https://doi.org/10.1016/j.nme.2025.101893
State	Published - Mar 2025

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.

Keywords

Divertor visible spectroscopy
EDGE2D
EIRENE
Fusion
Scrape-off layer

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10.1016/j.nme.2025.101893

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title = "Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas",

abstract = "Spectroscopic measurements of the hydrogenic Balmer-α and Balmer-γ line emission in JET-ILW low-confinement mode (L-mode) deuterium plasmas are used to assess the onset of volume recombination in the low-field side (LFS) divertor. The evolution of the EDGE2D-EIRENE predicted Balmer-γ to Balmer-α emission ratio from low-recycling to detached conditions is in qualitative agreement with the measured ratio. In low-recycling conditions the EDGE2D-EIRENE predicted line-emission is within 30\% of measured emission, in high-recycling within 20\%t, and in detached conditions lower by a factor of 2.5.",

keywords = "Divertor visible spectroscopy, EDGE2D, EIRENE, Fusion, Scrape-off layer",

author = "\{JET Contributors\} and Rikala, \{Vesa Pekka\} and M. Groth and Meigs, \{A. G.\} and D. Reiter and B. Lomanowski and A. Shaw and S. Aleiferis and G. Corrigan and Carvalho, \{I. S.\} and D. Harting and N. Horsten and I. Jepu and J. Karhunen and Lawson, \{K. D.\} and C. Lowry and S. Menmuir and B. Thomas and D. Borodin and D. Douai and A. Huber",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2025",

month = mar,

doi = "10.1016/j.nme.2025.101893",

language = "English",

volume = "42",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

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TY - JOUR

T1 - Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas

AU - JET Contributors

AU - Rikala, Vesa Pekka

AU - Groth, M.

AU - Meigs, A. G.

AU - Reiter, D.

AU - Lomanowski, B.

AU - Shaw, A.

AU - Aleiferis, S.

AU - Corrigan, G.

AU - Carvalho, I. S.

AU - Harting, D.

AU - Horsten, N.

AU - Jepu, I.

AU - Karhunen, J.

AU - Lawson, K. D.

AU - Lowry, C.

AU - Menmuir, S.

AU - Thomas, B.

AU - Borodin, D.

AU - Douai, D.

AU - Huber, A.

PY - 2025/3

Y1 - 2025/3

N2 - Spectroscopic measurements of the hydrogenic Balmer-α and Balmer-γ line emission in JET-ILW low-confinement mode (L-mode) deuterium plasmas are used to assess the onset of volume recombination in the low-field side (LFS) divertor. The evolution of the EDGE2D-EIRENE predicted Balmer-γ to Balmer-α emission ratio from low-recycling to detached conditions is in qualitative agreement with the measured ratio. In low-recycling conditions the EDGE2D-EIRENE predicted line-emission is within 30% of measured emission, in high-recycling within 20%t, and in detached conditions lower by a factor of 2.5.

AB - Spectroscopic measurements of the hydrogenic Balmer-α and Balmer-γ line emission in JET-ILW low-confinement mode (L-mode) deuterium plasmas are used to assess the onset of volume recombination in the low-field side (LFS) divertor. The evolution of the EDGE2D-EIRENE predicted Balmer-γ to Balmer-α emission ratio from low-recycling to detached conditions is in qualitative agreement with the measured ratio. In low-recycling conditions the EDGE2D-EIRENE predicted line-emission is within 30% of measured emission, in high-recycling within 20%t, and in detached conditions lower by a factor of 2.5.

KW - Divertor visible spectroscopy

KW - EDGE2D

KW - EIRENE

KW - Fusion

KW - Scrape-off layer

UR - https://www.scopus.com/pages/publications/85217394541

U2 - 10.1016/j.nme.2025.101893

DO - 10.1016/j.nme.2025.101893

M3 - Article

AN - SCOPUS:85217394541

SN - 2352-1791

VL - 42

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101893

ER -

Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas

Abstract

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Keywords

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