Alfredo Idini

Enhanced performance in fusion plasmas through turbulence suppression by megaelectronvolt ions

Aymerich E.;Cannas B.;Fanni A.;Minucci S.;Pau A.;Sias G.;
2022-01-01

Abstract

Alpha particles with energies on the order of megaelectronvolts will be the main source of plasma heating in future magnetic confinement fusion reactors. Instead of heating fuel ions, most of the energy of alpha particles is transferred to electrons in the plasma. Furthermore, alpha particles can also excite Alfvénic instabilities, which were previously considered to be detrimental to the performance of the fusion device. Here we report improved thermal ion confinement in the presence of megaelectronvolts ions and strong fast ion-driven Alfvénic instabilities in recent experiments on the Joint European Torus. Detailed transport analysis of these experiments reveals turbulence suppression through a complex multi-scale mechanism that generates large-scale zonal flows. This holds promise for more economical operation of fusion reactors with dominant alpha particle heating and ultimately cheaper fusion electricity.
2022
Inglese
18
7
776
782
7
https://www.nature.com/articles/s41567-022-01626-8
Esperti anonimi
scientifica
Alpha particles; Energy; Fast ions; Fusion devices; Fusion plasmas; Fusion reactors; Heating fuels; Ion confinements; Ions; Magnetic confinement fusions; Performance; Thermal ions; Turbulence; Turbulence suppression
Goal 7: Affordable and clean energy
Mazzi, S.; Garcia, J.; Zarzoso, D.; Kazakov, Y. O.; Ongena, J.; Dreval, M.; Nocente, M.; Stancar, Z.; Szepesi, G.; Eriksson, J.; Sahlberg, A.; Benkadd ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
1217
open
   Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
   EUROfusion
   European Commission
   Horizon 2020 Framework Programme
   633053
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