Calculation method for pulsed magnetic field energy supplied to Nb 3 Sn ITER CS conductors during SULTAN stability tests

Cable-In-Conduit Conductors (CICCs) for the ITER Central Solenoid (CS) magnets are designed to operate in thepresence of fast changing current and magneticfield during the plasma-operating scenario. For ITER, the AC lossof several types of Nb$_{}$Sn CICCs was experimentally tested, but only very limited experimental data is availablefor quantitative analysis of the minimum quench energy (MQE). In the SULTAN testing facility (Swiss PlasmaCentre) few CS conductors were tested on MQE, but the magneticfield amplitude and ramp rate settings are farfrom the actual ITER operating conditions. Nevertheless, such tests are needed as a basis to calibrate andbenchmark the codes that describe the quench behavior. Moreover, during the stability tests in Sultan, thetemperature measurements show severefluctuations, which can introduce a large error for the energy calcu-lation. An interpretation is given for the temperaturefluctuation and a procedure is proposed to significantlyreduce the error in the pulsed energy calculation