Resonance frequency broadening of wave-particle interaction in tokamaks due to Alfvenic eigenmode

Autor(es)

Meng, G. ^{[1, 2, 3]} ; Gorelenkov, N. N. ^[1] ; Duarte, V. N. ^{[4, 1]} ; Berk, H. L. ^[5] ; White, R. B. ^[1] ; Wang, X. G. ^{[2, 3, 6]}

Afiliação do(s) autor(es)

^[1] Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 - USA

^[2] Peking Univ, Fus Simulat Ctr, Beijing 100871 - Peoples R China

^[3] Peking Univ, State Key Lab Nucl Phys & Technol, Sch Phys, Beijing 100871 - Peoples R China

^[4] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo, SP - Brazil

^[5] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 - USA

^[6] Harbin Inst Technol, Dept Phys, Harbin 150001, Heilongjiang - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: NUCLEAR FUSION; v. 58, n. 8 AUG 2018.
• Citações Web of Science: 7

Resumo

We use the guiding center code ORBIT to study the broadening of resonances and the parametric dependence of the resonance frequency broadening width Delta Omega on the nonlinear particle trapping frequency w(b) of wave-particle interaction with specific examples using realistic equilibrium DIII-D shot 159243 (Collins et al 2016 Phys. Rev. Lett. 116 095001). When the mode amplitude is small, the pendulum approximation for energetic particle dynamics near the resonance is found to be applicable and the ratio of the resonance frequency width to the deeply trapped bounce frequency Delta Omega/w(b) equals 4, as predicted by theory. It is found that as the mode amplitude increases, the coefficient a = Delta Omega/w(b) becomes increasingly smaller because of the breaking down of the nonlinear pendulum approximation for the wave-particle interaction. (AU)

• Processo FAPESP: 14/03289-4 - Teoria quase-linear da interação de partículas energéticas com automodos de Alfvén induzidos por toroidicidade
• Beneficiário: Vinícius Njaim Duarte
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 12/22830-2 - Modos acústicos geodésicos e contínuo de Alfvén em colunas de plasma com rotação
• Beneficiário: Vinícius Njaim Duarte
• Linha de fomento: Bolsas no Brasil - Doutorado