ER15-ENEA-03

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Theory and simulation of energetic particle dynamics and ensuing collective behaviors in fusion plasmas

[NonLinear Energetic particle Dynamics (NLED)]

Principal Investigator:

Fulvio Zonca

Project Participants:

Alessandro Biancalani, Alberto Bottino, Matthias Borchardt, Sergio Briguglio, Nakia Carlevaro, Claudio Di Troia, Remi Dumont, Matteo Faganello, Giuliana Fogaccia, Valeria Fusco, Xavier Garbet, Ralf Kleiber, Axel Könies, Philipp Lauber, Alexander Milovanov, Oleksiy Mishchenko, Giovanni Montani, Gregorio Vlad, Xin Wang

External Collaborators (not supported by NLED funding):

Ilija Chavdarovski (MPPC PostDoc Fellow), Michael Cole (PhD Student), Matteo Falessi (PhD Student), Thomas Hayward (PhD Student), Malik Idouakass (PhD Student), Pierluigi Migliano (PostDoc Fellow), Francesco Palermo (PostDoc Fellow), Mirjam Schneller (EUROfusion Fellow till Feb.1st 2016), Christoph Slaby (PhD Student), David Zarzoso (AMU Faculty)

Participating Research Institutions:

Aix Marseille Univerity, CEA Cadarache, ENEA Frascati, IPP Garching, IPP Greifswald

Objectives of the NLED project 2015-17

The main aim of this project proposal is to assess the essential physics elements for successful numerical simulation of Alfvénic fluctuations and energetic particle behaviors in fusion plasmas. A variety of numerical codes adopting both gyrokinetic as well as hybrid fluid-kinetic approaches will be employed to accomplish this task. Reference plasma scenarios, including these fundamental processes, will be extracted from experimental observations for carrying out numerical studies in conditions of practical interest. Meanwhile, the use of physical models of increasing complexity within numerical simulation codes will allow to clearly identify the importance of accounting for realistic plasma nonuniformity and magnetic field geometry for successful comparisons of numerical simulation results with experimental observations. Furthermore, benchmarking of codes developed for analyzing these physics in tokamak and stellarator devices will provide deeper insights.

Standardized numerical diagnostics, in particular for energetic-particle phase-space, have been developed as part of the 2014 NLED ER Project; and are foreseen as essential ingredient of this project proposal as well as prerequisite for verification of numerical simulation results and code benchmarking for both linear and nonlinear dynamics. Linear simulations will be focused on benchmarking numerical simulations of different types of Alfvénic oscillations with perturbative and non-perturbative fast particle drive; and on the analysis of electron- fishbone stability properties. Meanwhile, nonlinear simulations will address perturbative analyses of multi-mode (Alfvén Eigenmode) scenarios including realistic damping, as well as nonlinear electron-fishbone saturation and self-consistent supra-thermal electron transport. For long time-scale simulations, realistic energetic particle sources and collisions will be taken into account.

Main ongoing research activities in 2017

  • Based on results of previous years, develop simplified/analytical EP transport models.

  • Numerical study of strongly driven TAEs/BAEs in the nonlinear phase including background turbulence. Role of mode-mode couplings and generation of low-n quasi-modes.

  • Nonlinear simulation of electron-fishbones in the presence of self-consistent zonal structures. Comparisons with reduced nonlinear dynamic models.

  • Stability analysis of EP driven Alfvénic fluctuation in ITER-like plasmas with HYMAGYC. Benchmark with other codes within the NLED project.

  • Implement mode-mode coupling in stellarators in CKA-EUTERPE; and benchmark/application of nonlinear electron fluid model.

  • Effects of fast particles on DAW modes and address fast particle losses/redistributions in Stellarators and in W7-X/Helias reactors.

  • Continue investigation of nonlinear EGAM dynamics and its characterization. Comparison with experiments in JET. Interaction between EPs and tearing modes via the excitation of EGAMs.

Activity Reports from previous years

  • [1] 2014 NLED Activity Report. PDF
  • [2] 2015 NLED Activity Report. PDF
  • [3] 2016 NLED Mid-Term Report. PDF
  • [4] 2016 NLED Activity Report. PDF


Upcoming Web Seminars and Rehearsals

  • [1] NLED Seminar by Christoph Slaby: Benchmarking and extending the collision operator implemented in the EUTERPE code; January 11, (2017) at 10.00 am. (Information on presentations and material can be requested from presenting authors.)
  • [2] Second NLED Workshop, February 27 - March 1, 2017, by remote participation. Agenda. PDF (Information on presentations and material can be requested from presenting authors.)


Publications/presentations in 2017

  • [1] L. Chen and F. Zonca, On Energetic-Particle Excitations of Low-Frequency Alfvén Eigenmodes in Toroidal Plasma. Submitted to Physics of Plasmas 24, (2017). (50% NLED support)
  • [1] S. Briguglio, M. Schneller, X. Wang, C. Di Troia, T. Hayward-Schneider, V. Fusco, G. Vlad and G. Fogaccia, Saturation of Alfvén modes in tokamak plasmas investigated by Hamiltonian mapping techniques. Nucl. Fusion 57 (2017) 072001 (21pp).


Publications/presentations in 2016

Publications/presentations in 2015

Publications/presentations in 2014

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