Spectroscopic camera analysis of the roles of molecularly assisted reaction chains during detachment in JET L-mode plasmas

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

doi:10.1016/j.nme.2022.101314

Spectroscopic camera analysis of the roles of molecularly assisted reaction chains during detachment in JET L-mode plasmas

Journal Article · Fri Dec 02 00:00:00 EST 2022 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2022.101314· OSTI ID:1985349

Karhunen, J. ^[1]; Holm, A. ^[2]; ^[1]; ^[1]; ^[2]; Lawson, K. D. ^[1]; ^[3]; ^[1]; Shaw, A. ^[1]; ^[2]

United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)
Aalto Univ., Otaniemi (Finland)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The roles of the molecularly assisted ionization (MAI), recombination (MAR) and dissociation (MAD) reaction chains with respect to the purely atomic ionization and recombination processes were studied experimentally during detachment in low-confinement mode (L-mode) plasmas in JET with the help of experimentally inferred divertor plasma and neutral conditions, extracted previously from filtered camera observations of deuterium Balmer emission, and the reaction coefficients provided by the ADAS, AMJUEL and H2VIBR atomic and molecular databases. The direct contribution of MAI and MAR in the outer divertor particle balance was found to be inferior to the electron–atom ionization (EAI) and electron–ion recombination (EIR). Near the outer strike point, a strong atom source due to the D$$^+_2$$ -driven MAD was, however, observed to correlate with the onset of detachment at outer strike point temperatures of T_e,osp = 0.9 –2.0 eV via increased plasma-neutral interactions before the increasing dominance of EIR at T_e,osp < 0.9 eV, followed by increasing degree of detachment. The analysis was supported by predictions from EDGE2D-EIRENE simulations which were in qualitative agreement with the experimental observations.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: European Commission; European Union; USDOE

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1985349

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Journal Issue: 1 Vol. 34; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (27)

Models and Numerics in the Multi-Fluid 2-D Edge Plasma Code EDGE2D/U Simonini, R.; Corrigan, G.; Radford, G. Contributions to Plasma Physics, Vol. 34, Issue 2-3 https://doi.org/10.1002/ctpp.2150340242	journal	January 1994
Survey of atomic processes in edge plasmas Janev, R. K.; Post, D. E.; Langer, W. D. Journal of Nuclear Materials, Vol. 121 https://doi.org/10.1016/0022-3115(84)90096-5	journal	May 1984
Plasma recombination and divertor detachment Krasheninnikov, S. I.; Pigarov, A. Yu.; Sigmar, D. J. Physics Letters A, Vol. 214, Issue 5-6 https://doi.org/10.1016/0375-9601(96)00185-5	journal	May 1996
Hydrogen molecules in the divertor of ASDEX Upgrade Fantz, U.; Reiter, D.; Heger, B. Journal of Nuclear Materials, Vol. 290-293 https://doi.org/10.1016/S0022-3115(00)00638-3	journal	March 2001
Progress in two-dimensional plasma edge modelling Reiter, D. Journal of Nuclear Materials, Vol. 196-198 https://doi.org/10.1016/S0022-3115(06)80014-0	journal	December 1992
Molecular contribution to the Dα emission in the divertor of the ASDEX Upgrade experiment Menmuir, S.; Rachlew, E.; Fantz, U. Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 105, Issue 3 https://doi.org/10.1016/j.jqsrt.2006.12.004	journal	July 2007
Role of molecular effects in divertor plasma recombination Kukushkin, A. S.; Krasheninnikov, S. I.; Pshenov, A. A. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.12.030	journal	August 2017
Molecular activated recombination in divertor simulation plasma on GAMMA 10/PDX Sakamoto, M.; Terakado, A.; Nojiri, K. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.05.001	journal	August 2017
EDGE2D-EIRENE predictions of molecular emission in DIII-D high-recycling divertor plasmas Groth, M.; Hollmann, E. M.; Jaervinen, A. E. Nuclear Materials and Energy, Vol. 19 https://doi.org/10.1016/j.nme.2019.02.035	journal	May 2019
Physics of ultimate detachment of a tokamak divertor plasma Krasheninnikov, S. I.; Kukushkin, A. S. Journal of Plasma Physics, Vol. 83, Issue 5 https://doi.org/10.1017/S0022377817000654	journal	September 2017
Development of a mirror-based endoscope for divertor spectroscopy on JET with the new ITER-like wall (invited) Huber, A.; Brezinsek, S.; Mertens, Ph. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4731759	journal	October 2012
Effect of reflections on 2D tomographic reconstructions of filtered cameras and on interpreting spectroscopic measurements in the JET ITER-like wall divertor Karhunen, J.; Carr, M.; Harrison, J. R. Review of Scientific Instruments, Vol. 90, Issue 10 https://doi.org/10.1063/1.5118885	journal	October 2019
Impact of carbon and tungsten as divertor materials on the scrape-off layer conditions in JET Groth, M.; Brezinsek, S.; Belo, P. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093016	journal	August 2013
Spectroscopic measurement of atomic and molecular deuterium fluxes in the DIII-D plasma edge Hollmann, E. M.; Brezinsek, S.; Brooks, N. H. Plasma Physics and Controlled Fusion, Vol. 48, Issue 8 https://doi.org/10.1088/0741-3335/48/8/009	journal	July 2006
Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation Agostini, M.; Vianello, N.; Carraro, L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab4122	journal	September 2019
Development and simulation of multi-diagnostic Bayesian analysis for 2D inference of divertor plasma characteristics Bowman, C.; Harrison, J. R.; Lipschultz, B. Plasma Physics and Controlled Fusion, Vol. 62, Issue 4 https://doi.org/10.1088/1361-6587/ab759b	journal	February 2020
A novel hydrogenic spectroscopic technique for inferring the role of plasma–molecule interaction on power and particle balance during detached conditions Verhaegh, K.; Lipschultz, B.; Bowman, C. Plasma Physics and Controlled Fusion, Vol. 63, Issue 3 https://doi.org/10.1088/1361-6587/abd4c0	journal	January 2021
Assessment of filtered cameras for quantitative 2D analysis of divertor conditions during detachment in JET L-mode plasmas Karhunen, J.; Lomanowski, B.; Solokha, V. Plasma Physics and Controlled Fusion, Vol. 63, Issue 8 https://doi.org/10.1088/1361-6587/ac0b9e	journal	July 2021
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. Plasma Physics and Controlled Fusion, Vol. 64, Issue 7 https://doi.org/10.1088/1361-6587/ac6ae3	journal	May 2022
Investigation of atomic and molecular processes in H _α emission through modelling of measured H _α emissivity profile using DEGAS2 in the ADITYA tokamak Dey, Ritu; Chowdhuri, M. B.; Ghosh, Joydeep Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab0f01	journal	May 2019
A spectroscopic inference and SOLPS-ITER comparison of flux-resolved edge plasma parameters in detachment experiments on TCV Perek, A.; Wensing, M.; Verhaegh, K. Nuclear Fusion, Vol. 62, Issue 9 https://doi.org/10.1088/1741-4326/ac7813	journal	July 2022
Inference of molecular divertor density from filtered camera analysis of molecularly induced Balmer line emission during detachment in JET L-mode plasmas Karhunen, J.; Holm, A.; Lomanowski, B. Journal of Instrumentation, Vol. 17, Issue 01 https://doi.org/10.1088/1748-0221/17/01/C01032	journal	January 2022
Dissociative attachment and vibrational excitation in low-energy collisions of electrons with H 2 and D 2 Bardsley, J. N.; Wadehra, J. M. Physical Review A, Vol. 20, Issue 4 https://doi.org/10.1103/PhysRevA.20.1398	journal	October 1979
Dissociative Electron Attachment Cross Sections for H 2 and D 2 Krishnakumar, E.; Denifl, S.; Čadež, I. Physical Review Letters, Vol. 106, Issue 24 https://doi.org/10.1103/PhysRevLett.106.243201	journal	June 2011
Large Isotope Effect in the Formation of H − or D − by Electron Impact on H 2 , HD, and D 2 Rapp, D.; Sharp, T. E.; Briglia, D. D. Physical Review Letters, Vol. 14, Issue 14 https://doi.org/10.1103/PhysRevLett.14.533	journal	April 1965
Collisional Radiative Kinetics of Molecular Assisted Recombination in Edge Plasmas Pigarov, A. Yu. Physica Scripta, Vol. T96, Issue 1 https://doi.org/10.1238/Physica.Topical.096a00016	journal	January 2002
Evaluation of State-Resolved Reaction Probabilities and Their Application in Population Models for He, H, and H2 Wünderlich, Dirk; Fantz, Ursel Atoms, Vol. 4, Issue 4 https://doi.org/10.3390/atoms4040026	journal	September 2016

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