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. • The EDGE2D-EIRENE predictions of D α and D γ emissions in JET-ILW are compared to experiment. • EDGE2D-EIRENE under-predicts the n e and overestimates the T e in the near-SOL. • The EDGE2D-EIRENE predicted evolution of D γ / D α qualitatively agrees with experiment. • The Balmer-line diagnostics offers easy access to monitoring the divertor conditions.
Authors
- A. Meigs (ORCID: https://orcid.org/0000-0002-8071-864X)
- D. Borodin (ORCID: https://orcid.org/0000-0001-8354-1387)
- I.S. Carvalho (ORCID: https://orcid.org/0000-0002-2458-8377)
- N. Horsten (ORCID: https://orcid.org/0009-0004-7396-9776)
- B. Lomanowski (ORCID: https://orcid.org/0000-0003-2226-2004)
- S. Aleiferis (ORCID: https://orcid.org/0000-0001-7529-470X)
- B. Thomas (ORCID: https://orcid.org/0000-0002-4035-0721)
- J. Karhunen (ORCID: https://orcid.org/0000-0001-5443-518X)
- D. Reiter (ORCID: https://orcid.org/0000-0001-5635-7103)
- K. Lawson (ORCID: https://orcid.org/0000-0002-1251-6392)
- I. Jepu (ORCID: https://orcid.org/0000-0001-8567-3228)
- A. Huber (ORCID: https://orcid.org/0000-0002-3558-8129)
- D. Douai (ORCID: https://orcid.org/0009-0002-6980-9927)
- M. Groth (ORCID: https://orcid.org/0000-0001-7397-1586)
- D. Harting (ORCID: https://orcid.org/0000-0002-4995-6607)
- Vesa‐Pekka Rikala (ORCID: https://orcid.org/0000-0003-1957-7267)
- S. Menmuir (ORCID: https://orcid.org/0000-0003-3250-0256)
- G. Corrigan
- C. Lowry
- A. Shaw
Publication Details
- Journal
- Nuclear Materials and Energy
- Published
- 2025-02-10
- DOI
- https://doi.org/10.1016/j.nme.2025.101893
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 0.00