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Author: Henry Strauss
Requested Type: Pre-Selected Invited
Submitted: 2018-02-27 13:35:11

Co-authors: S.Jachmich,E.Joffrin,V.Riccardo,J.Breslau,R.Paccagnella,G.Y.Fu

Contact Info:
HRS Fusion
2 Januson Ct.
West Orange, NJ   07052

Abstract Text:
Asymmetric vertical displacement event (AVDE) disruptions in
ITER should produce a relatively small electromechanical force on
the conducting structures
surrounding the plasma, in contrast to previous predictions based on JET data.
This is shown in simulations [1,2]
with the M3D 3D MHD code [3] and confirmed in JET
experiments [4].
In ITER the current quench (CQ) time is less than or equal to the resistive wall
penetration time, which causes reduction of the wall force.
JET is in a different parameter regime, with CQ time greater than the wall time.
JET simulations were validated by comparison to JET shot 71985 data and were in good
agreement. The wall time was then artificially increased, keeping the CQ time 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.
Further simulations were carried out of ITER AVDEs.
The asymmetric wall force was calculated for a wide range of CQ times with fixed wall time.
For CQ time less than or equal to wall time, the asymmetric force was
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.

[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).