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3 results on '"divertor Thomson scattering"'

1. Validation of EDGDE2D-EIRENE predicted 2D distributions of electron temperature and density against divertor Thomson scattering measurements in the low-field side divertor leg in DIII-D

Author

M. Groth, A.G. McLean, W.H. Meyer, A.W. Leonard, S.L. Allen, G. Corrigan, M.E. Fenstermacher, D. Harting, C.J. Lasnier, F. Scotti, H.Q. Wang, and J.G. Watkins

Subjects
Divertor plasma, DIII-D, Divertor Thomson Scattering, EDGE2D-EIRENE, Nuclear engineering. Atomic power, TK9001-9401
Abstract

Comparisons of profiles of the electron temperature (Te), density (ne) and pressure (pe) measured with Divertor Thomson Scattering in DIII-D low-confinement mode discharges to predictions from the edge fluid code EDGE2D-EIRENE [1] show that the models implemented in EDGE2D-EIRENE predict the measurements within their collective uncertainties if the Te at the separatrix (Te,sep) is 10 eV, or higher. The simulations do not predict, however, the peaked Te and ne profiles measured adjacent to the target plate when Te,sep, is below 10 eV, i.e., for the plasma downstream from the region of ionization of deuterium atoms. Inclusion of cross-field drifts and a fivefold reduction of radial transport cannot reconcile the discrepancy between the measurements and predictions.

Published
2023
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2. Experimental investigation of L- and H-mode detachment via the divertor Thomson scattering at ASDEX Upgrade

Abstract

The capabilities of the newly installed divertor Thomson Scattering (DTS) diagnostic (Kurzan et al 2021 J. Inst. 16 C09012) at ASDEX Upgrade (AUG) have been demonstrated by measuring 2D electron densities n e and temperatures T e from attached to fully detached divertor conditions in L- and H-mode. The collected dataset is a breakthrough for divertor studies at AUG in which such measurements have been so far missing. Besides highlighting the strengths and limits of the DTS system, this work provides confirmations and new insights into detachment physics. The transition between partial and pronounced detachment correlates with a 2D redistribution of the electron density from the inner to the outer divertor in both L- and H-mode. In pronounced detachment, a strong parallel pressure gradient could be confirmed throughout the complete SOL. Finally, measurements of n e and T e of a stable X-point radiator revealed local temperatures as low as 1 eV within the confined plasma, whereas the pressure is shown to be constant on closed field lines.

Published
2022

3. Experimental investigation of L- and H-mode detachment via the divertor Thomson scattering at ASDEX Upgrade

Author

M. Cavedon, B. Kurzan, M. Bernert, D. Brida, R. Dux, M. Griener, S. Henderson, E. Huett, T. Nishizawa, T. Lunt, O. Pan, U. Stroth, M. Wischmeier, E. Wolfrum, null the ASDEX Upgrade Team, Cavedon, M, Kurzan, B, Bernert, M, Brida, D, Dux, R, Griener, M, Henderson, S, Huett, E, Nishizawa, T, Lunt, T, Pan, O, Stroth, U, Wischmeier, M, Wolfrum, E, and ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society

Subjects
H-mode, Nuclear and High Energy Physics, divertor Thomson scattering, detachment, divertor, L-mode, Paper, Condensed Matter Physics, ddc
Abstract

The capabilities of the newly installed divertor Thomson Scattering (DTS) diagnostic (Kurzan et al 2021 J. Inst. 16 C09012) at ASDEX Upgrade (AUG) have been demonstrated by measuring 2D electron densities n e and temperatures T e from attached to fully detached divertor conditions in L- and H-mode. The collected dataset is a breakthrough for divertor studies at AUG in which such measurements have been so far missing. Besides highlighting the strengths and limits of the DTS system, this work provides confirmations and new insights into detachment physics. The transition between partial and pronounced detachment correlates with a 2D redistribution of the electron density from the inner to the outer divertor in both L- and H-mode. In pronounced detachment, a strong parallel pressure gradient could be confirmed throughout the complete SOL. Finally, measurements of n e and T e of a stable X-point radiator revealed local temperatures as low as 1 eV within the confined plasma, whereas the pressure is shown to be constant on closed field lines.

Published
2022

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