Experimental distinction of the molecularly induced Balmer emission contribution and its application for inferring molecular divertor density with 2D filtered camera measurements during detachment in JET L-mode plasmas

Karhunen, J.; Holm, A.; Lomanowski, B.; Solokha, V.; Aleiferis, S.; Carvalho, P.; Groth, M.; Lawson, K. D.; Meigs, A. G.; Shaw, A.

doi:10.1088/1361-6587/ac6ae3

Experimental distinction of the molecularly induced Balmer emission contribution and its application for inferring molecular divertor density with 2D filtered camera measurements during detachment in JET L-mode plasmas

Journal Article · Mon May 23 00:00:00 EDT 2022 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac6ae3· OSTI ID:1876275

^[1]; ^[2]; ^[3]; ^[2]; Aleiferis, S. ^[4]; Carvalho, P. ^[5]; ^[2]; ^[6]; Meigs, A. G. ^[6]; Shaw, A. ^[6]

Culham Science Centre, Abingdon (United Kingdom); University of Helsinki (Finland)
Aalto University, Espoo (Finland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Culham Science Centre, Abingdon (United Kingdom); National Center for Scientific Research, Athens (Greece)
Culham Science Centre, Abingdon (United Kingdom); Instituto Superior Técnico, Lisbon (Portugal)
Culham Science Centre, Abingdon (United Kingdom)

A previously presented model for generating 2D estimates of the divertor plasma conditions at JET from deuterium Balmer line intensity ratios, obtained from tomographic reconstructions of divertor camera images, was amended to consider also the Balmer emission arising from molecular processes. Utilizing the AMJUEL and H2VIBR atomic and molecular databases of EIRENE enabled also inference of the molecular divertor density from the distinguished molecularly induced emission. Analysis of a JET L-mode density scan suggests the molecularly induced emission accounting for up to 60%–70% and 10%–20% of the Balmer Dα and Dγ intensities, respectively, at the onset of detachment, while electron-ion recombination becomes increasingly dominant with deepening detachment. Similar observations were made by post-processing EDGE2D-EIRENE simulations, which indicated significant roles of molecular D$$^{+}_{2}$$ ions and vibrational excitation of the D₂ molecules as precursors for the molecularly induced emission. The experimentally inferred molecular density at the outer strike point was found to increase monotonously with decreasing strike point temperature, reaching approximately 30%–50% of the local electron density at n_{mol, osp} = 1–2 X 10²⁰ m^-3 at T_e,osp ≈ 0.7 eV. A further steep increase by a factor of 3–5 was observed with decrease of T_e,osp to 0.5 eV. The observations are in qualitative and reasonable quantitative agreement with EDGE2D-EIRENE predictions of n_{mol, osp} within the uncertainties of the experimental data.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Euratom Research and Training Programme; USDOE Office of Science (SC)

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1876275

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 7 Vol. 64; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Experimental distinction of the molecularly induced Balmer emission contribution and its application for inferring molecular divertor density with 2D filtered camera measurements during detachment in JET L-mode plasmas

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