Journal Article Analysis of Quench Propagation in the ITER Central Solenoid Insert (CSI) Coil

Bonifetto, Roberto  ,  Isono, Takaaki  ,  Martovetsky, Nicolai  ,  Savoldi, Laura  ,  IEEE, Member,  ,  Zanino, Roberto  ,  Member, IEEE, Senior

The ITER Central Solenoid Insert (CSI) coil, a single-layer Nb3Sn solenoid, wound using the same conductor of the 3L module of the ITER Central Solenoid, was tested in 2015 at the National Institutes for Quantum and Radiological Science and Technology (Former JAEA) Naka, Japan, inside the bore of the Central Solenoid Model Coil. At the end of the test campaign, quench tests were carried out to study the quench initiation and propagation. Different delay time (up to 7 s) between quench detection and current dump were set, in order to explore to which extent the dump could be delayed without exceeding the maximum allowed hot spot temperature. The experimental data for different time delays are presented and compared, showing a good reproducibility of the measurements and confirming the safe operation of the coil during these tests. The previously developed and already extensively validated 4C thermal-hydraulic code is then used to model the tranient up to the current dump and a comprehensive comparison between the simulation results and the measurements is presented.

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