Stability and Quench Test for NbTi CIC Conductor of JT-60SA Equilibrium Field Coil | IEEE Journals & Magazine | IEEE Xplore

Stability and Quench Test for NbTi CIC Conductor of JT-60SA Equilibrium Field Coil


Abstract:

The EF coil conductors of JT-60SA are designed with the NbTi cable in conduit conductor because the maximum magnetic field goes up to 6.2 T. The prototype NbTi conductor...Show More

Abstract:

The EF coil conductors of JT-60SA are designed with the NbTi cable in conduit conductor because the maximum magnetic field goes up to 6.2 T. The prototype NbTi conductor was developed and tested to confirm the capability of the real conductor. The prototype conductor was proven to have enough Tcs margin under the operating conditions investigated in previous test. In this study, the quench test was operated to measure the stability margin and the normal state propagation. Firstly, the MQE under the Tcs margin of 0.2 K was found to be 80 mJ/cc-strand which is almost the same as that of the previous CIC conductor to result in enough stability margins on EF coil operation. Secondly, the propagation velocity to upstream direction and downstream direction were found to be about 0.47 m/s and 0.54 m/s, respectively. Finally, the quench analysis was conducted to calculate the maximum temperature during quench. The analysis results showed that the maximum temperature reached about 70 K, which is within the permissible value of 150 K for the EF coils.
Published in: IEEE Transactions on Applied Superconductivity ( Volume: 20, Issue: 3, June 2010)
Page(s): 512 - 516
Date of Publication: 18 March 2010

ISSN Information:


I. Introduction

The magnet system in JT-60 Super Advanced (JT-60SA) consists of 18 toroidal field (TF) coils, 4 stacks of central solenoid (CS) and 6 plasma equilibrium field (EF) coils [1], [2]. The EF coil conductors are designed with NbTi cable in conduit (CIC) conductor because maximum magnetic field is up to 6.2 T [3], [4]. The prototype NbTi conductor was developed and tested to confirm the capability of real conductor by Japan Atomic Energy Agency (JAEA) and National Institute for Fusion Science (NIFS).

References

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