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 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.

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Divertor visible spectroscopy, EDGE2D, EIRENE, Fusion, Scrape-off layer

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10.1016/j.nme.2025.101893

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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, 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

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https://urn.fi/URN:NBN:fi:aalto-202502282624

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[article-cris] Perustieteiden korkeakoulu / SCI

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

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