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

Vesa Pekka Rikala; M. Groth; A. G. Meigs; D. Reiter; B. Lomanowski; A. Shaw; S. Aleiferis; G. Corrigan; I. S. Carvalho; D. Harting; N. Horsten; I. Jepu; J. Karhunen; K. D. Lawson; C. Lowry; S. Menmuir; B. Thomas; D. Borodin; D. Douai; A. Huber; 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

Vesa Pekka Rikala^*, M. Groth, A. G. Meigs, D. Reiter, B. Lomanowski, A. Shaw, S. Aleiferis, G. Corrigan, I. S. Carvalho, D. Harting, N. Horsten, I. Jepu, J. Karhunen, K. D. Lawson, C. Lowry, S. Menmuir, B. Thomas, D. Borodin, D. Douai, A. HuberJET Contributors

^*Corresponding author for this work

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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
Pages (from-to)	1-10
Number of pages	10
Journal	Nuclear Materials and Energy
Volume	42
DOIs	https://doi.org/10.1016/j.nme.2025.101893
Publication status	Published - Mar 2025
MoE publication type	A1 Journal article-refereed

Keywords

Divertor visible spectroscopy
EDGE2D
EIRENE
Fusion
Scrape-off layer

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Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmasFinal published version, 3.56 MBLicence: CC BY

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Rikala, V. P., Groth, M., Meigs, A. G., Reiter, D., Lomanowski, B., Shaw, A., Aleiferis, S., Corrigan, G., Carvalho, I. S., Harting, D., Horsten, N., Jepu, I., Karhunen, J., Lawson, K. D., Lowry, C., Menmuir, S., Thomas, B., Borodin, D., Douai, D., ... JET Contributors (2025). Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas. Nuclear Materials and Energy, 42, 1-10. Article 101893. https://doi.org/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 = "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 and {JET Contributors}",

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

year = "2025",

month = mar,

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

language = "English",

volume = "42",

pages = "1--10",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

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Rikala, VP, Groth, M, Meigs, AG, Reiter, D, Lomanowski, B, Shaw, A, Aleiferis, S, Corrigan, G, Carvalho, IS, Harting, D, Horsten, N, Jepu, I, Karhunen, J, Lawson, KD, Lowry, C, Menmuir, S, Thomas, B, Borodin, D, Douai, D, Huber, A & JET Contributors 2025, 'Characterization of detachment inferred from the Balmer line ratios in JET-ILW low-confinement mode plasmas', Nuclear Materials and Energy, vol. 42, 101893, pp. 1-10. https://doi.org/10.1016/j.nme.2025.101893

TY - JOUR

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

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.

AU - JET Contributors

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 - http://www.scopus.com/inward/record.url?scp=85217394541&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2025.101893

DO - 10.1016/j.nme.2025.101893

M3 - Article

AN - SCOPUS:85217394541

SN - 2352-1791

VL - 42

SP - 1

EP - 10

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

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Keywords

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