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approvedhstrauss.pdf2017-03-17 03:55:23Henry Strauss


Author: Henry Strauss
Requested Type: Pre-Selected Invited
Submitted: 2017-03-17 03:31:57

Co-authors: E. Joffrin, V. Riccardo, J. Breslau

Contact Info:
HRS Fusion
28 Porter Road
West Orange, NJ   07052
United States

Abstract Text:
Nonlinear 3D MHD asymmetric vertical displacement event (AVDE) disruption
simulations have been performed
with the M3D 3D MHD code [1], and validated with JET experimetal data.
The simulations
were initialized with EFIT equilibrium reconstruction
of JET disruption shot
Several experimentally measured quantities were compared with the simulation
and found in good agreement.
The quantities that were compared were
vertical displacement and toroidal current,
halo current asymmetry [2],
toroidal current asymmetry [3],
toroidal flux asymmetry [3],
and toroidal rotation.
The toroidal plasma current is higher at toroidal locations where
the plasma position is closer to the wall [3] in both experiment and simulations.
This correlation is also demonstrated analytically, without
invoking skin currents.
The Noll relation [4] between asymmetric wall force and vertical current moment is
verified in the simulations.
In JET, the resistive wall penetration time, which characterizes the VDE, is much less than the current quench time.
ITER is expected to be in a different regime, with the wall time greater than or equal to the current quench time.
Extrapolating from JET can overestimate the asymmetric wall force in ITER disruptions
by an order of magnitude.

[1] W. Park et al.,
Phys. Plasmas textbf{6} 1796 (1999).

[2] V. Riccardo, et al.,
Plasma Phys. Control. Fusion textbf{46}, 925 (2004).

[3] S.N. Gerasimov, et al.,
Nucl. Fusion textbf{54} 073009 (2014);
Nucl. Fusion textbf{55} 113006 (2015).

[4] V. Riccardo, et al.,
Nuclear Fusion textbf{40} 1805 (2000).

Supported by USDOE and
within the framework of the EUROfusion Consortium.