The effect of the ITER-like wall on runaway electron generation in JET
Journal article, 2013

This paper investigates the effect of the ITER-like wall (ILW) on runaway electron (RE) generation through a comparative study of similar slow argon injection JET disruptions, performed with different wall materials. In the carbon wall case, a RE plateau is observed, while in the ITER-like wall case, the current quench is slower and the runaway current is negligibly small. The aim of the paper is to shed light on the reason for these differences by detailed numerical modelling to study which factors affected the RE formation. The post-disruption current profile is calculated by a one-dimensional model of electric field, temperature and runaway current taking into account the impurity injection. Scans of various impurity contents are performed and agreement with the experimental scenarios is obtained for reasonable argon and wall impurity contents. Our modelling shows that the reason for the changed RE dynamics is a complex, combined effect of the differences in plasma parameter profiles, the radiation characteristics of beryllium and carbon, and the difference of the injected argon amount. These together lead to a significantly higher Dreicer generation rate in the carbon wall case, which is less prone to being suppressed by RE loss mechanisms. The results indicate that the differences are greatly reduced above ~50% argon content, suggesting that significant RE current is expected in future massive gas injection experiments on both JET and ITER.

Author

Gergely Papp

Chalmers, Applied Physics, Nuclear Engineering

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Tamás Fehér

EFDA-JET

Max Planck Institute

P. De Vries

Foundation for Fundamental Research on Matter

EFDA-JET

V Riccardo

EFDA-JET

Culham Lab

C Reux

EFDA-JET

École polytechnique

M Lehnen

EFDA-JET

Forschungszentrum Jülich

V Kiptily

Culham Lab

EFDA-JET

V V Plyusnin

Instituto Superior Tecnico

EFDA-JET

B Alper

EFDA-JET

Culham Lab

Nuclear Fusion

0029-5515 (ISSN)

Vol. 53 12 123017-

Driving Forces

Sustainable development

Areas of Advance

Energy

Roots

Basic sciences

Subject Categories

Fusion, Plasma and Space Physics

DOI

10.1088/0029-5515/53/12/123017

More information

Latest update

6/20/2018