Thermal-hydraulic analysis of different design concepts of the LTS TF coil winding pack for EU-DEMO

The new iteration of three design concepts of the low T
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superconductor winding pack for the EU-DEMO Toroidal Field (TF) coil has been proposed in 2016 by EPFL-SPC PSI Villigen, ENEA Frascati and CEA Cadarache. Our work presents the results of the thermal-hydraulic analysis of all the candidate designs using simplified models. The performed analysis includes: (i) hydraulic analysis - calculation of the mass flow rates in each conductor at the expected value of pressure drop in the coil at the operating conditions during the dwell phase, (ii) heat removal analysis aimed at the assessment of the minimum temperature margin at the end of the plasma burn, (iii) assessment of the maximum temperature and the maximum pressure in each conductor during quench for the extreme case of quench initiation. The influence of the nuclear heat load map, realistic magnetic field map and joint resistance on the value of the minimum temperature margin in WP#1 is studied in details.