Resonant interaction between runaway electrons and the toroidal magnetic field ripple in TCV

the TCV team, T. Wijkamp (Corresponding author), A. Perek, I. Classen, R. Jaspers

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Samenvatting

This work explains the anomalously high runaway electron (RE) pitch angles inferred in the flat-top of dedicated Tokamak à Configuration Variable (TCV) experiments. Kinetic modelling shows that the resonant interaction between the gyromotion of the electrons and the toroidal magnetic field ripple will give rise to strong pitch angle scattering in TCV. The resulting increase in synchrotron radiation power losses acts as a RE energy barrier. These observations are tested experimentally by a magnetic field ramp-down, which gradually reduces the resonant parallel momentum at which the REs interact with the ripple. Resulting changes in synchrotron emission geometry and intensity are observed using three multi-spectral camera imaging systems, viewing the RE beam at distinct spatial angles in multiple wavelength ranges. Experimental reconstructions of the RE distribution in momentum- and real-space are consistent with kinetic model predictions.

Originele taal-2Engels
Artikelnummer016021
Aantal pagina's10
TijdschriftNuclear Fusion
Volume64
Nummer van het tijdschrift1
DOI's
StatusGepubliceerd - jan. 2024

Financiering

This work has been carried out within the framework of the EUROfusion Consortium, partially funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200 - EUROfusion). The Swiss contribution to this work has been funded by the Swiss State Secretariat for Education, Research and Innovation (SERI). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union, the European Commission or SERI. Neither the European Union nor the European Commission nor SERI can be held responsible for them. This work was supported in part by the Swiss National Science Foundation.

FinanciersFinanciernummer
European Commission or SERI
European Commission101052200 - EUROfusion
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Staatssekretariat für Bildung, Forschung und Innovation

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