Speaker
Description
The transport of supra-thermal particles in fusion plasmas can only be inadequately described with a local and 1-d radial-diffusive transport model due to the broad orbits and resonances that occur. A general gyrokinetic transport theory has been developed in recent years - the Phase Space Zonal Structure transport theory [1, 2, 3, 4], which extends the conventional transport equations into Phase Space and consistently evolves a (nonlinear) equilibrium referred to as the Zonal State. This new theory is currently implemented in a transport code (ATEP-3D)[5, 6] that has been developed to describe the fluxes in the three dimensional constants-of-motion (CoM) space as calculated from single particle trajectories determined from a pre-calculated perturbed Hamiltonian. Sources and sinks are modeled inside simulations as well, in order to properly simulate the evolution of the energetic particle (EP) distribution, and the eventual stationary distribution arising from the balance of sources and sinks in the presence of a spectrum of unstable modes. Comparison with well-established Monte-Carlo codes for the slowing down of EPs will be shown. Various models for describing the phase-space transport of particles due to their interaction with a spectrum of un-
stable modes are discussed.
Authors:
T. Sterkl (1), Ph. Lauber (1), M. Falessi (2), G. Meng (1), T. Hayward-Schneider (1), V.-A. Popa (1), R. Stucchi (1)
(1) Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, Germany
(2) ENEA, Fusion and Nuclear Safety Department, C. R. Frascati, I-00044 Frascati (Rome), Italy
email: tristan.sterkl@ipp.mpg.de
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and
Training Programme (Grant Agreement No 101052200 EUROfusion). Views and opinions expressed are however those of the author(s) only and do
not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can
be held responsible for them.
References
[1] Falessi M V and Zonca F 2019 Physics of Plasmas 26 022305 URL https://doi.org/10.1063/1.5063874
[2] Zonca F, Chen L, Falessi M V and Qiu Z 2021 Journal of Physics: Conference Series 1785 012005 URL https://dx.doi.org/10.1088/
1742-6596/1785/1/012005
[3] Falessi M V, Chen L, Qiu Z and Zonca F 2023 New Journal of Physics 25 123035 URL https://dx.doi.org/10.1088/1367-2630/ad127d
[4] F Zonca et al 2025 Proc. 30th IAEA FEC, Chengdu, China (2025)
[5] Lauber P, Falessi M, Meng G, Hayward-Schneider T, Popa V A, Zonca F and Schneider M 2024 Nuclear Fusion 64 096010 URL https:
//dx.doi.org/10.1088/1741-4326/ad6336
[6] Meng G, Lauber P, Lu Z, Bergmann A and Schneider M 2024 Nuclear Fusion URL http://iopscience.iop.org/article/10.1088/
1741-4326/ad5190