Manufacture of the hollow supercritical He cooled conductor for the ECN/Sultan project

This paper describes the manufacturing process for the conductor used in the ECN contribution to the Sultan project. This conductor which is cooled by forced flow supercritical helium is composed of a 16 strand Rutherford Cable continuously soldered to a rectangular copper tube. The requirements of the magnet design criteria on the choice of materials and manufacturing methods is discussed. In particular the final manufacturing method of joining the conductors by a "continuous casting" process is described in detail.