H Viebke et al 2006 J. Phys.: Conf. Ser. 43 748 doi:10.1088/1742-6596/43/1/183
H Viebke1, D Gustke1, T Rummel1, C Sborchia1, R Schroeder1, D Williams2, S Bates2, B Leigh2 and R Winter2
Show affiliationsWENDELSTEIN 7-X (W7-X) is a superconducting stellarator. The planar coils are in charge to modify the magnetic filed configuration of the W7-X. The major challenges during manufacturing were the fabrication of the cable-in-conduit conductor, the accuracy of the coil cases after welding and machining and the development of electrical joints with a resistance below 1 nΩ. Leaks were detected during repetitive in the case cooling system, which were caused by stress corrosion cracking. High voltage tests in a reduced vacuum environment (Paschen conditions) revealed that the insulation had to be reinforced and the quench detection wires had to be exchanged. This paper gives an overview about the main technical challenges of the planar coils and the lessons learned during production.
84.71.Ba Superconducting magnets; magnetic levitation devices
06.60.Mr Testing and inspecting procedures
85.25.Am Superconducting device characterization, design, and modeling
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H Viebke et al 2006 J. Phys.: Conf. Ser. 43 748
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