Speaker
Dr
Emmanuel Joffrin
(CEA)
Description
Disruption remains the major risk for the operation of ITER and fusion reactors. JET
is now equipped with three fast disruption mitigation valves (DMVs) located at different
poloidal and toroidal locations mimicking the ITER set-up of DMVs. In JET, massive gas
injection (MGI) from one DMV is systematically applied with 90% deuterium and 10%
Argon when a disruption event is detected for plasma current above 2MA or energy content
in excess of 5MJ total energy. Using the JET disruption mitigation system, the vessel forces
during vertical displacement of disruptions could be reduced by 40% and the asymmetric
forces fully mitigated.
In the past two years JET has developed a comprehensive scientific programme in
view of understanding and controlling disruptions in the metallic environment. In particular,
using the set of DMVs, important advances have been achieved in understanding the
efficiency of massive gas injection, the impact of the electro-magnetic loads and radiation
asymmetry. The need to mitigate disruptions up to high plasma current (4.5MA) has
prompted pragmatic approaches to disruption prediction. Modelling efforts has also been
carried out for a better understanding of the electromagnetic loads (halo currents) and
massive gas injection physics.
| Country or International Organization | France |
|---|---|
| Paper Number | EX/9-1 |
Primary author
Dr
Emmanuel Joffrin
(CEA)
Co-authors
Dr
Alessandro Pau
(Electrical and Electronic Engineering Dept.-University of Cagliari, Italy)
Dr
Alexandre Fil
(Princeton University)
Dr
Andrea Murari
(Consorzio RFX Padova)
Dr
Boniface N'Konga
(Laboratoire J.A.Dieudonné)
Dr
Carlo Sozzi
(Istituto di Fisica del Plasma CNR, Associazione EURATOM-ENEA)
Dr
Cedric Reux
(CEA, IRFM, F-13108 Saint Paul-lez-Durance, France.)
Mr
Dr. Paccagnella
(Consorzio RFX and Consiglio Nazionale delle Ricerche (CNR))
Dr
Eric Nardon
(CEA)
Dr
Fabio Villone
(ENEA/CREATE, DAEIMI, Università di Cassino, Italy)
Dr
Fernanda Rimini
(CCFE)
Gabriella Pautasso
(IPP, Garching, Germany)
Mr
Guy Matthews
(Culham Centre for Fusion Energy)
Dr
Henry Strauss
(HRS Fusion)
Dr
Jesus Vega
(CIEMAT)
Dr
Matteo Barruzo
(CCFE)
Dr
Michael Lehnen
(Forschungszentrum Jülich GmbH)
Dr
Peter Drewelow
(IPP)
Dr
Peter de Vries
(ITER Organization)
Prof.
Piero MARTIN
(Consorzio RFX)
Dr
Raul Moreno
(CIEMAT)
Dr
Sergei Gerasimov
(CCFE)
Dr
Stefan Jachmich
(Ecole royale Bruxelles)
Dr
Tim Hender
(CCFE)
Dr
Uron Kruezi
(CCFE)
Dr
Valeria riccardo
(CCFE)
Mr
riccardo roccella
(ITER Organization)
