Page 159 - Fundamentals of Magnetic Thermonuclear Reactor Design

140 Fundamentals of Magnetic Thermonuclear Reactor Design

FIGURE 5.14 Process flow sheet of a multistage twisted superconducting cable production.
(1) SC strand, (2) strand coating (chromium and nickel plating), (3) fabrication of the central helix,
(4) long-length jacket assembling and welding, (A) compacting with a two-roller compacting de-
vice, (B) compacting with a three-roller compacting device, (C) wrapping with stainless-steel tapes.

The multi-stage twisted cable production process, complemented with
strand coating (Cr or Ni) and cable wrapping procedures, is shown in Fig. 5.14.
The cable’s total length is 860 m.
The cable jacketing process includes the following stages (Figs 5.15
and 5.16):
l jacket assembly by butt welding of 6–12-m tube sections;
l jacket examination for compliance with geometric tolerances;
l non-destructive examination of weld joints with colour defectoscopy, X-ray
and ultrasonic methods;
l jacket leak-tightness tests;

FIGURE 5.15 Schematic diagram of a superconducting cable pull-through jacketing line.
(1) Cable delivery device, (2) cable, (3) welding device, (4) control station, (5) station for the tube
edges machining before welding, (6) jacket force lock and dynamometer, (7) welded jacket, (8)
caterpillar-type device for moving the jacket during assembly, (9) winch, (10) turning rolls, (11) roll
table, (12) steel cable and (13) hangar.