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

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
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2025

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 = "אנגלית",

volume = "42",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier Ltd.",

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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 - 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 - ???researchoutput.researchoutputtypes.contributiontojournal.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

Bibliographical note

Keywords

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