Gyrokinetic modelling of the Alfven mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution

被引：5

作者：

Vannini, F. ^{[1
]}

Biancalani, A. ^{[2
]}

Bottino, A. ^{[1
]}

Hayward-Schneider, T. ^{[1
]}

Lauber, P. ^{[1
]}

Mishchenko, A. ^{[3
]}

Poli, E. ^{[1
]}

Rettino, B. ^{[1
]}

Vlad, G. ^{[4
]}

Wang, X. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, Boltzmann Str 2, D-85748 Garching, Germany

[2] Leonard Vinci Pole Univ, Res Ctr, F-92916 Paris, France

[3] Max Planck Inst Plasma Phys, Wendelstein Str 1, D-17491 Greifswald, Germany

[4] ENEA, FSN, CR Frascati, Via E Fermi 45, I-00044 Frascati, Italy

来源：

NUCLEAR FUSION | 2022年 / 62卷 / 12期

关键词：

Alfven instabilities; ASDEX Upgrade; isotropic slowing-down; equivalent Maxwellian; TAE; EPM; NEUTRAL BEAM INJECTION; ELECTROSTATIC OSCILLATIONS; ENERGETIC PARTICLES; INSTABILITIES; DRIVEN; WAVES; EIGENMODES; EXCITATION; STABILITY; LOSSES;

D O I：

10.1088/1741-4326/ac8b1e

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In the present paper, the evolution of the Alfven modes (AMs) is studied in a realistic ASDEX Upgrade equilibrium by analyzing the results of simulations with the global, electromagnetic, gyrokinetic particle-in-cell code ORB5. The energetic particles (EPs) are modelled both via the newly implemented isotropic slowing-down and with Maxwellian distribution functions. The comparison of the numerical results shows that modelling the EPs with the equivalent Maxwellian rather than with the slowing-down, does not significantly affect the frequency of the driven AM, while its growth rate appears to be underestimated with a quantitative difference as large as almost 30%. Additionally the choice of the isotropic slowing-down allows a better description of the nonlinear modification of the dominant AM frequency, while an equivalent Maxwellian underestimates it. A good comparison with the experimental spectrogram is found.

引用

页数：19