Speaker
Roberto Bonifetto
(Energy Department)
Description
The ITER Central Solenoid Model Coil (CSMC) is a superconducting solenoid operated at the JAEA centre of Naka, Japan, since 2000 to test the performance of insert coils in its bore, where it produces a magnetic field of 13 T representative of the ITER CS operating conditions.
In 2015, the ITER Central Solenoid Insert (CSI), whose Nb3Sn cable-in-conduit conductor (CICC) will be adopted for the 3L module of the ITER CS, was successfully tested in the bore of the CSMC. The test of the CSI performance allowed assessing its current sharing temperature after up to 16 thousand cycles in different operating conditions (in terms of magnetic field and current) corresponding to different phases of the plasma pulse, namely initial magnetization and end of burn. As a full-size short sample of the same CICC was previously tested in the SULTAN facility, SULTAN-like operating conditions were also reproduced to allow a comparison, with special reference to the effect of the Hoop strain, not present in the SULTAN straight sample tests.
The data collected during the recent CSI tests at different cycles are reported in detail and, when applicable, compared to the SULTAN results. The 4C code is used to analyse the CSI performance. First the calibration of the free parameters of the model (the effective n-value and the extra longitudinal strain) is performed based on the measured voltage and jacket temperature Tjk along the CSI. Then 4C is used to compute the evolution of the conductor strand temperature, which is compared to the measured Tjk.
The performance of the conductor 1A of the CSMC, also measured, are also analysed with the 4C code and the results are compared with the measurements performed in the previous test campaigns (2000, 2001, 2002 and 2008).
Co-authors
Laura Savoldi
(Energy Department, Politecnico di Torino, Torino, Italy)
Nicolai Martovetsky
(US ITER Project Office, Oak Ridge (TN), United States)
Roberto Bonifetto
(Energy Department, Politecnico di Torino, Torino, Italy)
Roberto Zanino
(Energy Department, Politecnico di Torino, Torino, Italy)
