Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sherwood17_dp_poster.pdf | 2017-05-12 08:53:53 | David Pfefferlé |
Abstracts
Author: David Pfefferlé
Requested Type: Poster
Submitted: 2017-03-17 12:20:49
Co-authors: N.Ferraro, S.C.Jardin, C.E.Myers,A.Bhattacharjee
Contact Info:
Princeton Plasma Physics Laboratory
P.O. Box 451
Princeton, NJ 08543
USA
Abstract Text:
Of the many reasons a plasma discharge disrupts, Vertical Displacement Events (VDEs) lead to the most severe forces and stresses on the vacuum vessel and Plasma Facing Components (PFCs). After loss of positional control, the plasma column drifts across the vacuum vessel and comes in contact with the first wall, at which point the stored magnetic and thermal energy is abruptly released. In this work, the highly non-linear and multi-domain physics of VDEs is modelled with the implicit 3D extended MHD code M3D-C1. The computational domain consists of a toroidally symmetric finite element unstructured mesh including 1) an in-vessel sub-domain where extended MHD equations are solved 2) a closed finite thickness resistive structure and 3) a current-free vacuum region. Fully 3D non-linear simulations are performed using realistic transport coefficients based on a so-called NSTX frozen VDE, where feedback control was purposely switched off to trigger a vertical instability. The dynamics of the current quench and the onset of 3D halo/eddy currents are analysed. Normal currents and wall forces are compared with experimental traces. The effect of breaks in the resistive wall on the evolution of the current is discussed.
Comments: