Final design and manufacturing of the Cryolegs of the W7-X-superconducting coil support system

One of the most complicated tasks during the assembly of the Wendelstein W7-X is the installation of the superconductive coil system.The entire magnet system is enclosed between the Outer Vessel and the plasma vessel in high vacuum at 4 K.The coils are supported by a support structure, the Central Support Structure (CSS).The CSS carries all 70 coils, and it is designed as a closed ring made of 5 modules (10 half modules). The whole structure is supported by 10 Cryolegs which rest on the machine base.This paper describes the final design and manufacture of these Cryolegs.