Thermo-Hydraulic Analyses Associated With the Design of Jt-60sa Tf Coils Development and Validation of the Tacos∕texto Tool

Abstract

In the framework of the JT-60SA project, TF coils design activities have led to the development of TEXTO (Thermo-hydraulic EXtended TOol), a dedicated simulation tool centred on the GANDALF code for calculating the temperature margin (∆Tma) central criterion. From a first version providing conservative results, this tool has been upgraded to a pseudo 3D model by integrating a 1D thermo-hydraulic approach in ANSYS, leading to an additional and independent module named TACOS (Thermo-hydraulic Ansys COmputation Semi 3D).By providing He temperature in conductors, TACOS is well adapted for evaluating the impact of TF coils design choices in the framework of cost and feasibility optimization. TACOS also provides more accurate values of transverse heat flux from case to conductors, which can then be injected into TEXTO and allow the calculation of the temperature margin, thanks to the functionalities of GANDALF.Several validation calculations have been performed for the reference operation scenario, by comparison with GANDALF for validating the simplified thermo-hydraulic method of TACOS and by comparison with VINCENTA for an overall validation of the TACOS/TEXTO tool. Results have shown a good consistency between the different models, with a conductor temperature dispersion around 0.05 K in the critical zone.

Design of JT-60SA Magnets and Associated Experimental Validations

“…First, the TF conductor design was found sound with respect to the temperature safety margin when proper strand specifications are considerd. The main design parameters of conductor and strand can be seen in Table III, consolidated by previous electromagnetic and thermohydraulic studies [13]- [16] allowing to switch confidently to industrial phase. Recent parametric analyses have been led using common strand characteristics input for evaluating the possible critical performances degradations derived from TF coil manufacturing stages, e.g.…”

Impact of TF Magnet Mass Flow on Conductor Margin and on Cryogenic System of JT-60SA

“…This mass flow perturbation in the conductors should nevertheless be limited, as the mass flow in the TF casing represents less than 12% of the winding pack mass flow. Finally, the limits of TACOS/TEXTO were found acceptable [4], and this tool allowed to evaluate the impact of several TF coil design features in the framework of cost and feasibility optimization [5].…”