Analysis of sudden quench of an ITER superconducting NbTi full-size short sample using the THELMA code
Authors: Zanino, R; Bellina, F; Ribani, P L; Richard, L Savoldi
Source: Superconductor Science and Technology, Volume 24, Number 10, October 2011 , pp. 105001-105014(14)
Publisher: IOP Publishing
Abstract:The coupled thermal–hydraulic electromagnetic model, implemented in the THELMA code, is applied to the analysis of the sudden quench in the ITER NbTi poloidal field conductor insert full-size joint sample. The computed results are compared with the measured values, showing that the major experimental features, like the premature and sudden voltage take-off, as well as the presence of precursors of the quench in the form of voltage spikes, can be qualitatively reproduced by the code. A self-consistent explanation of the phenomenon is presented, emphasising the effect of current, magnetic field and temperature non-uniformities on the cable cross section, together with the fundamental role played by coupled electromagnetic and thermal–hydraulic dynamics in the current redistribution associated with the voltage spikes.
Document Type: Research Article
Publication date: 2011-10-01