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

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

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 emi...

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Main Authors: 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
Format: Article
Language:English
Published: Elsevier 2025-03-01
Series:Nuclear Materials and Energy
Subjects:
Fusion
Scrape-off layer
Divertor visible spectroscopy
EDGE2D
EIRENE
Online Access:http://www.sciencedirect.com/science/article/pii/S235217912500033X
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Summary: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.
ISSN:2352-1791

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