Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade

The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation and the mode nonlinear evolution is not yet fully understood....

ver descrição completa

Detalhes bibliográficos
Autores: Wang, Hao, Lauber, Philipp, Todo, Yasushi, Suzuki, Yasuhiro, Li, Hanzheng, Idouakass, Malik, Wang, Jialei, Adulsiriswad, Panith, ASDEX Upgrade Team, Viezzer, Eleonora, Cruz Zabala, Diego José, García Muñoz, Manuel, Cano Megías, Pilar, Domínguez-Palacios Durán, Jesús José, Galdón Quiroga, Joaquín, Rivero Rodríguez, Juan Francisco, Sanchis Sánchez, Lucía
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2025
País:España
Recursos:Universidad de Sevilla (US)
Repositório:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:dnet:idus________::02ee6b6bc97af4ad07906f43a5c1d671
Acesso em linha:https://hdl.handle.net/11441/187200
https://doi.org/10.1038/s41598-024-82577-3
Access Level:Acceso aberto
Descrição
Resumo:The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation and the mode nonlinear evolution is not yet fully understood. In the present work, a first-principles simulation using the MEGA code investigated the mode properties in both the linear growth and nonlinear saturated phases. Here we show that the simulation successfully reproduced the excitation and coexistence of these two modes, and agreed with the experimental results well. Conclusive evidence showed that the resonance overlap is the excitation mechanism of the energetic-particle-driven geodesic acoustic mode. In the linear growth phase, energetic particles that satisfied different resonance conditions excited the Alfvén instability, which then caused energetic particle redistribution in phase space. These redistributed energetic particles caused resonance overlap, exciting the energetic-particle-driven geodesic acoustic mode in the nonlinear phase.

Registros relacionados