Abstract Details
Abstracts
Author: David Zarzoso
Requested Type: Consider for Invited
Submitted: 2023-03-23 16:49:22
Co-authors: H. Betar, B. Clavier, D. del-Castillo-Negrete
Contact Info:
CNRS
31 chemin Joseph Aiguier
Marseille, 13009
France
Abstract Text:
The confinement of energetic particles (EP) is crucial to ensure the transfer of energy to the thermal plasma and to achieve self-sustained fusion reactions. Together with EP, turbulence is another major element in the description of a fusion plasma. When both EP and turbulence co-exist, their mutual interplay cannot be neglected. Whereas the impact of EP on turbulence has extensively been analyzed, the effect of turbulence of EP trajectories and transport has only been studied in a few publications, most of them using the gyro-kinetic approach [1]. In this presentation, we use a new GPU-accelerated code called TAPAS (for Toroidal Accelerated PArticle Simulator) [2] that was developed to study the transport in the presence of turbulence and electromagnetic perturbations. Owing to its efficiency of parallelization, TAPAS has the capability of solving a large number of full-orbit trajectories (~109) while being coupled to 3D perturbations from external codes. Here we use the perturbation from the gyro-kinetic GYSELA5D code [3] to study the transport and the losses of EP in the presence of an Ion Temperature Gradient driven turbulence. A parametric study is performed on the energy of particles, highlighting the difference between the two approaches, full-orbit versus guiding-center, in the presence and in the absence of collisions. Through the simulations presented here, we provide evidence of the non-invariance of the magnetic moment for particles with supra-thermal energy, analyzing the role of the properties of the turbulence (frequency and mode numbers), the trajectories of the particles and the energy exchange between particles and turbulent modes. Our results can have significant consequences regarding the use of gyro-kinetic codes for EP transport.
[1] T. Hauff et al Phys. Rev. Lett. 102 (7), 075004 (2009)
[2] D. Zarzoso et al Plasma Phys. Control. Fusion 64 044003 (2022)
[3] V. Grandgirard et al Comp. Phys. Comm. 207 35–68 (2016)
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