Speaker
Dr
Yves Peysson
(CEA)
Description
The sudden termination of a plasma discharge known as a major disruption is a well-identified difficulty from the beginning of tokamak research, which remains still today particularly problematic for the design of a reliable fusion reactor. The key questions are principally related to the growth rate of relativistic electron population, closely linked to the level of the critical electrical field for an electron to run-away, and the upper energy limit that it can reach. Recently, very important achievements have been obtained in this domain. The introduction of the synchrotron radiation reaction force in kinetic calculations is shown to limit the upper energy of the runaway beam to 20-30 MeV consistent with observations [1]. Refined studies have also included the effect of bremsstrahlung radiation [2]. The calculation of the runaway avalanche growth rate has been improved by considering accurately the magnetic field inhomogeneity [3] and the screening effect of partially ionized impurities [4]. With the development of a synthetic diagnostic for the synchrotron radiation [5], numerical tools have reached the required level to perform realistic kinetic simulations of the runaway electron population for assessing effective control capabilities of existing techniques for ITER. A review of the progresses and challenges is performed.
1. J. Decker, et al., Plasma Phys. Control. Fusion 58 (2016) 025016
2. O. Embreus, et al., New J. Phys. 18 (2016) 093023
3. E. Nilsson, et al., Plasma Phys. Control. Fusion 57 (2015) 095006
4. L. Hesslow, et al., Phys. Rev. Letter 118 (2017) 255001
5. M. Hoppe, et al., Nucl. Fusion 58 (2018) 026032
| Country or International Organization | France |
|---|---|
| Paper Number | TH/P8-14 |
Primary author
Dr
Yves Peysson
(CEA)
Co-authors
Dr
Adam Budai
(INT, Budapest University of Technology and Economics, Budapest, Hungary)
Dr
Adam Stahl
(SeUChalmers)
Prof.
Alain Brizard
(Department of Physics, Saint Michael's College, Colchester, Vermont 05439, USA)
Mr
Alexander Shevelev
(RuIoffe)
Dr
Boglarka Erdos
(INT, Budapest University of Technology and Economics, Budapest, Hungary)
Dr
Cedric Reux
(CEA, IRFM, F-13108 Saint Paul-lez-Durance, France.)
Dr
Cristian Sommariva
(FrCEAIRFM)
Dr
Eero Hirvijoki
(SeUChalmers)
Dr
Emelie Nilsson
(FrCEAIRFM)
Dr
Eric Nardon
(CEA)
Dr
Francois SAINT-LAURENT
(CEA)
George Wilkie
(University of Maryland)
Dr
Gergely Papp
(Max Planck Institute for Plasma Physics)
Dr
Gergo Pokol
(NTI, Budapest University of Technology and Economics, Hungary)
Dr
Giorgos Anastassiou
(National Technical University of Athens, Zografou, Athens 15773, Greece)
Prof.
Hizanidis Kiriakos
(National Technical University of Athens, Zografou, Athens 15773, Greece)
Dr
Jan Mlynar
(Institute of Plasma Physics, Czech Academy of Sciences)
Dr
Jean-François Artaud
(FrCEAIRFM)
Dr
Joan Decker
(ChSPC)
Dr
Konsta Sarkimaki
(FiUAalto)
Dr
Linea Hesslow
(SeUChalmers)
Dr
Mattias Hoppe
(SeUChalmers)
Dr
Michael Lehnen
(ITER Organization)
Dr
Milos Vlainic
(BeGhent)
Dr
Ola Embreus
(SeUChalmers)
Mr
Ondrej Ficker
(Institute of Plasma Physics of the Czech Academy of Sciences)
Dr
Panagiotis Zestanakis
(National Technical University of Athens, Zografou, Athens 15773, Greece)
Dr
Philipp Lauber
(IPP Garching)
Dr
Richard Paprok
(CzIPP)
Dr
Robert Granetz
(MIT)
Dr
Roland Lohner
(INT, Budapest University of Technology and Economics, Budapest, Hungary)
Dr
Roy Alexander Tinguely
(UsPSFC)
Dr
Sarah Newton
(Chalmers University of Technology)
Dr
Taina Kurki-Suonio
(Aalto University)
Prof.
Tünde Fülöp
(Chalmers University of Technology)
Dr
Yannis Kominis
(National Technical University of Athens, Zografou, Athens 15773, Greece)
