Articolo in rivista, 2021, ENG, 10.1088/1741-4326/abfb14
Gobbin M.; Marrelli L.; Valisa M.; Li L.; Liu Y.Q.; Papp G.; Pautasso G.; McCarthy P.J.; the ASDEX Upgrade Team; the EUROfusion MST1 Team
CNR ISTP, Istituto per la Scienza e Tecnologia dei Plasmi, Sede di Padova - Consorzio RFX, Padova (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Italy; College of Science, Donghua University, Shanghai, China; General Atomics, San Diego, CA 92186-5608, United States of America; Max-Planck-Insitute for Plasma Physics, Garching, Germany; Department of Physics, University College Cork, Cork, Ireland.
The data collected during ASDEX Upgrade experiments in which external 3D fields have been deployed in the attempt of mitigating runaway electrons (RE) are interpreted by a numerical test particle approach. To this end the Hamiltonian guiding center code ORBIT has been used, with the implementation of the magnetic perturbation spectrum modeled by the code MARS-F, which also takes into account the plasma response to the applied 3D fields. In agreement with the observed phenomenology, ORBIT simulations show that the configuration of the currents in the top/bottom arrays of error field coils, which maximizes the plasma response to the external perturbations, is the one that most affects the high energy test electron trajectories in the edge region, thus leading to an enhancement of the energetic electron losses. This occurs in particular during the disruption, i.e. taking into account the increased toroidal electric field associated with the fast plasma cooling. Used in a predictive way, the numerical results suggest which coil configuration could further improve the RE mitigation.
Nuclear fusion 61 (6), pp. 066037-1–066037-14
runaways, 3D fields, plasma response, particle trajectories
Marrelli Lionello, Gobbin Marco, Valisa Marco
ID: 454809
Year: 2021
Type: Articolo in rivista
Creation: 2021-06-17 16:26:39.000
Last update: 2022-03-29 09:35:46.000
CNR authors
CNR institutes
External links
OAI-PMH: Dublin Core
OAI-PMH: Mods
OAI-PMH: RDF
URL: https://iopscience.iop.org/article/10.1088/1741-4326/abfb14/meta
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:454809
DOI: 10.1088/1741-4326/abfb14
Scopus: 2-s2.0-85107160899
ISI Web of Science (WOS): 000655328600001