Speaker
Henry Strauss
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O3.105.pdf
Asymmetric wall force reduction in ITER and JET disruptions
H. Strauss1 , S. Jachmich2 , E. Joffrin3 V. Riccardo4 ,R. Paccagnella5 ,J. Breslau4 and JET Contributors ∗
1 HRS Fusion, West Orange NJ, USA 07052
2 EURATOM/UKAEA Fusion Association, Culham Science Centre, OX14 3DB, UK
3 IRFM, CEA centre de Cadarache, 13108 Saint-Paul-lez-Durance, France
4 Princeton Plasma Physics Laboratory, Princeton, NJ, USA 08570
5 Consorzio RFX and Istituto Gas Ionizzati del C.N.R., Padua, Italy
Asymmetric vertical displacement event (AVDE)
∆Fx, πB∆MIZ, vs. τCQ/τwall
disruptions in ITER should produce a relatively 1.4
1.2
small electromechanical force on the conducting
1
structures surrounding the plasma, in contrast to
0.8
MN
previous predictions based on JET data. This is 0.6
∆ Fx
71985
85858
shown in simulations [1, 2] with the M3D 3D MHD 0.4 90386
code [3] and confirmed in JET experiments [4] in 0.2
which the current was quenched with massive gas 0
1 10
τCQ/τwall
injection (MGI). In ITER the current quench (CQ)
time τCQ is less than or equal to the resistive wall
Figure 1: simulated asymmetric wall force
penetration time τwall . JET is in a different param-
∆Fx , and wall force estimated from MGI
eter regime, with τCQ /τwall > 1. JET simulations
shots, labeled with JET shot number.
were validated by comparison [1] to JET shot 71985
data and were in good agreement. The wall time τwall was then artificially increased, keeping
τCQ fixed, and it was found that the wall force decreased. The reduction of the asymmetric wall
force was also found in analysis of experimental data of JET MGI mitigated disruption shots,
although the published data only concerned the symmetric wall force [4]. Further simulations
[2] were carried out of ITER AVDEs. For τCQ /τwall ≤ 1, the force was 4MN, comparable to the
force in JET. A fast CQ may cause production of runaway electrons (REs). Simulations using a
modified version of M3D with a fluid RE model [5] will be presented.
Acknowledgment Work supported by USDOE and Euratom research and training programme 2014-
2018 under grant agreement No 633053, within the EUROfusion Consortium. Views and opinions herein
do not necessarily reflect those of the European Commission.
References
[1] H. Strauss, E. Joffrin, V. Riccardo, J. Breslau, R. Paccagnella, Phys. Plasmas 24 102512 (2017).
[2] H. Strauss, Physics of Plasmas 25 020702 (2018).
[3] W. Park, E. Belova, G. Y. Fu, et al., Phys. Plasmas 6 1796 (1999).
[4] S. Jachmich, P. Drewelow, et al., 43rd EPS Conf. Plasma Physics (2016)
[5] Huishan Cai and Guoyong Fu, Nucl. Fusion 55 022001 (2015).
∗
see author list of X. Litaudon et al 2017 Nucl. Fusion 57 102001
