Assessment of filtered cameras for quantitative 2D analysis of divertor conditions during detachment in JET L-mode plasmas

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

doi:10.1088/1361-6587/ac0b9e

Assessment of filtered cameras for quantitative 2D analysis of divertor conditions during detachment in JET L-mode plasmas

Journal Article · Thu Jul 01 00:00:00 EDT 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac0b9e· OSTI ID:1860560

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

Univ. of Helsinki (Finland); Aalto Univ., Otaniemi (Finland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Aalto Univ., Otaniemi (Finland)
National Center for Scientific Research, Athens (Greece)
Inst. of Superior Tecnico (IST), Lisbon (Portugal)
Culham Science Centre, Abingdon (United Kingdom)

We report that estimates for 2D distributions of electron temperature, T_e, electron density, n_e, and atomic deuterium density, n_o, in the JET divertor volume have been inferred from deuterium Balmer line intensity ratios obtained from tomographic reconstructions of divertor camera measurements. This enables also investigation of ionization, S_ion, and recombination, S_rec, rates. The analysis shows a decrease of T_e to 0.5–1.0 eV throughout the outer divertor during detachment in low-confinement (L-mode) plasmas. Simultaneously, the high-n_e region and the n₀ distribution in the outer divertor are observed to elongate and shift from the outer strike point towards the X-point. The observations are in qualitative agreement and follow the same sequence with modelling predictions of EDGE2D-EIRENE simulations of a density scan. While the method was found to provide good representation of the evolution of volumetric recombination during detachment, in agreement with the simulations, the movement of the ionization front upstream could not be followed due to lack of spatial overlap between the ionization region and the necessary emission distributions. Consequently, the representation of the ionization conditions and the particle balance in the detached outer divertor are compromised.

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:: 1860560

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 8 Vol. 63; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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