Initial Fulcher band observations from high resolution spectroscopy in the MAST-U divertor

Osborne, N.; Verhaegh, K.; Bowden, M. D.; Wijkamp, T.; Lonigro, N.; Ryan, P.; Pawelec, E.; Lipschultz, B.; Soukhanovskii, V.; van den Biggelaar, T.

doi:10.1088/1361-6587/ad1654

Title: Initial Fulcher band observations from high resolution spectroscopy in the MAST-U divertor

Journal Article · 27 December 2023 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ad1654 · OSTI ID:2283286

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University of Liverpool (United Kingdom); Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
University of Liverpool (United Kingdom)
Eindhoven University of Technology (Netherlands)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); University of York (United Kingdom)
University of Opole, Opole (Poland)
University of York (United Kingdom)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

High resolution D$$^*_2$$ Fulcher band spectroscopy was used in the MAST-U divertors during Super-X and (shorter-legged) elongated divertor density ramps with D₂ fuelling from the mid-plane high-field side. In the Super-X case, the upper divertor showed ground state rotational temperatures of the D₂ molecules increasing from ~6000 K, starting at the detachment onset, to ~9000 K during deepening detachment. This was correlated with the movement of the Fulcher emission region towards the X-point, which is in turn correlated with the movement of the ionisation source. The increase in rotational temperature occurred throughout the divertor except near the divertor entrance, where ionisation was still the dominant process. Qualitative agreement was obtained between the lower and upper divertor. Similar rotational temperatures were obtained in the elongated divertor before the detachment onset, although the increase in rotational temperature during detachment was less clearly observed as less deep detachment was obtained. The measured vibrational distribution of the upper Fulcher state does not agree with a ground state Boltzmann distribution but shows a characteristically elevated population in the ν = 2 and ν = 3 bands in particular; which is strongly correlated to the rotational temperature.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Engineering and Physical Sciences Research Council (EPSRC); European Union

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2283286

Report Number(s):: LLNL--JRNL-858521; 1089083

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 2 Vol. 66; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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