Transport and losses of fusion-born alpha particles in the presence of tearing modes using the new Toroidal Accelerated P article Simulator (TAPaS)

David Zarzoso, Diego Del-Castillo-Negrete, Rémi Lacroix, Pierre Eric Bernard, Stanislas Touzet

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5 Scopus citations

Abstract

The transport and losses of fusion-born alpha particles are studied in the presence of a single-helicity tearing mode, characterized by (m=2,n=1). The analysis is performed by means of the recently developed Toroidal Accelerated Particle Simulator (TAPaS). Although such modes have usually been believed to result only in a local flattening of the radial profiles, it is shown that the density profile can exhibit a global modification leading to significant losses of alpha particles. This is due to the fact that, although the magnetic field does not exhibit any chaotic behaviour, the trajectories of alpha particles do, as revealed by their Poincaré maps. Such results are in qualitative agreement with past observations and simulations of energetic particles generated by neutral beam injection in TFTR, DIII-D and AUG tokamaks. In-depth analysis is carried out to characterize the impact of the tearing mode on the transport and losses of fusion-born alpha-particles with a realistic density profile. The impact of the amplitude is evidenced. Moreover, the effect of the island rotation frequency is assessed based on a detailed analysis of the linear resonances in phase-space, in agreement with the simulation results. Finally, the probability density function of the exit time has been computed and the transport of alpha particles has been found to be anomalous.

Original languageEnglish
Article number044003
JournalPlasma Physics and Controlled Fusion
Volume64
Issue number4
DOIs
StatePublished - Apr 2022

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was granted access to the HPC resources of IDRIS under the allocation 2021-A0100512455 made by GENCI. D d-C-N was sponsored by the Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under Contract No. DE-AC05-00OR22725. Finally, TAPaS development, optimization and deployment on GPU accelerator were done within the framework of an advanced support program funded by IDRIS and GENCI.

Keywords

  • GPU acceleration
  • anomalous transport
  • energetic particle transport
  • magnetic fusion
  • particle orbits
  • plasma simulations

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