SMuK 2023 – scientific programme
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.33: Poster
Wednesday, March 22, 2023, 17:30–19:00, HSZ EG
Modeling of diagnostics for radiated power studies in Wendelstein 7-X — •G. Partesotti1, F. Reimold1, A. Demby2, G. Wurden3, and D. Zhang1 — 1IPP, HGW, DE — 2UW-Madison, WI, US — 3LANL, NM, US
In the field of magnetically confined fusion plasmas, stellarators like Wendelstein 7-X promise a more stable, steady-state operation, at the cost of increased, three-dimensional complexity of the magnetic field geometry. One of the many implications is the asymmetric distribution of impurities, which in turn causes radiative losses in the plasma to follow an inherently 3-D asymmetric pattern [1,2].
Given that radiation is a primary power dissipation mechanism, reliably estimating and predicting these patterns is crucial to accurately control the heat load on the divertor targets, so as to mitigate erosion and avoid exceeding material limits. For this purpose, it is therefore necessary to develop adequate 3-D signal post-processing techniques and diagnostic tools.
This contribution describes how the response of infra-red and resistive foil bolometer cameras was modeled with ray tracing [3], and how the so-obtained synthetic measurements can be combined to improve radiation tomography in W7-X. First, a set of emc3-calculated radiation patterns is studied to assess the 3-D aspects of the radiation distribution. Then, Gaussian Process Tomography is applied, combining physical and experimental constraints from multiple diagnostics and a newly designed Compact Bolometer Camera [4].
[1] Braun 2010, [2] Zhang 2021, [3] Carr 2018, [4] Moser 2020