Runaway electron plateau current profile reconstruction from synchrotron imaging and Ar-II line polarization angle measurements in DIII-D

Marini, C.; Hollmann, E. M.; Tang, S. W.; Herfindal, J. L.; Shiraki, D.; Wilcox, R. S.; del-Castillo-Negrete, D.; Yang, M.; Eidietis, N.; Hoppe, M.

doi:10.1088/1741-4326/ad4db6

Title: Runaway electron plateau current profile reconstruction from synchrotron imaging and Ar-II line polarization angle measurements in DIII-D

Journal Article · 06 June 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad4db6 · OSTI ID:2426998

; Hollmann, E. M.;

;

; Shiraki, D.;

;

; Yang, M.;

;

Abstract Current profile reconstructions are obtained for high current ( $I_{p} ≃ 550$ kA) post-disruption runaway electron (RE) plateau plasmas in DIII-D. Two novel methods of measuring the RE current profile in high-current RE plateaus are introduced and compared: localization of the q = 2 rational surface using visible synchrotron emission (SE) imaging and the measurement of the polarization angle of line-integrated Ar-II line emission. The two methods are found to be consistent with each other within the data uncertainties. Different simulations of the RE current profile are compared with the measurements: the toroidal fluid RE model is found to best fit the data, within the measurement uncertainties. In addition to introducing two novel methods to measure the RE current profile and validating present simulation capabilities, this work demonstrates that instabilities can grow at q = 2 and q = 1 surfaces without necessarily causing a RE final loss instability. Numerical simulations are also presented to elucidate the role of these instabilities on synchrotron emission.

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Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI ID:: 2426998

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 7 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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