Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 15: HEPP V
P 15.5: Talk
Wednesday, February 28, 2024, 15:45–16:10, ELP 6: HS 3
Investigation of radiation distribution and scaling for power exhaust in W7-X — •Gabriele Partesotti1, Felix Reimold1, Glen Wurden2, Daihong Zhang1, and Byron Peterson3 — 1Max-Planck Institute for Plasma Physics, Greifswald, Germany — 2Los Alamos National Lab, Los Alamos (NM), USA — 3National Institute for Fusion Science, Toki, Japan
Radiation emission is one of the main heat loss channels for magnetically confined fusion plasmas. In terms of performance, its effect can be either beneficial - e.g. mitigation of power load on the plasma-facing components - or detrimental - e.g. core cooling, radiation collapse. Still, the toroidal distribution of radiated power in a stellarator machine and its behavior in the island divertor are not fully understood yet. In light of this, the present work aims to study the three-dimensional characteristics of radiation in the stellarator geometry of Wendelstein 7-X (W7-X), and its sensitivity to magnetic configuration and plasma parameters. The analysis begins with an introduction of the diagnostic systems, including both resistive and infrared imaging bolometers. It follows a description of the principal features of the W7-X edge radiation resulting from EMC3-EIRENE simulations. Based on these findings, a new concept of Compact Bolometer Camera (CBC) is designed and tested to improve diagnostic coverage and assess poloidal and toroidal radiation asymmetries. Finally, the toroidal variation of the radiated power distribution is investigated by comparing local measurements with projected tomographic reconstructions.
Keywords: radiation; bolometer; diagnostic; fusion; IRVB