D R A F T - 16-Jan-2006
WBS 1.1 MAGNET SYSTEM

Toroidal field winding packs
including radial plates & covers
(for 9 TF coils + 1 spare)

Procurement Package 1.1-1A
"Toroidal Field Magnet Windings"
ITER Cost 2001 for Sharing: 85.2 kIUA
Sharing: EU=100%
Function, Scope of Supply:
18 coils ensure the creation of the horizontal magnetic field required for plasma confinement, this is called toroidal field (TF), generated by a toroidal array of 18 adjacent and identical TF coils.

The toroidal field, established permanently thanks to superconducting winding packs, has a nominal value of 5.3 Tesla at the major radius of the machine (center of the plasma).

The supply is related to the manufacture of 10 complete TF windings including radial plates (9 + 1 spare), intended to be inserted in the stainless steel case which is the mechanical structure of the coils (to be procured by Japan)
Description, Technologies :

The TF winding packs use superconducting cables in niobium tin, cooled by means of supercritical helium at a temperature of 4.5 Kelvin.
The conductors (procured in 1.1-6A) are isolated electrically using a Kapton-based system impregnated under vacuum with epoxy resin and are then inserted in radial plates, made of stainless steel 316LN, providing the local mechanical support. After welding of the covers of the radial plate the resulting sub-assembly forms a double pancake which is electrically isolated. In a TF winding pack there are 7 double pancakes. In summary the the main tasks are:
- double pancakes
- conductor winding (the approach is to wind double pancakes with one conductor length)
- conductor termination
- heat treatment (reacting the conductor to form Nb3Sn)
- turn insulation
- transfer and cover plate welding (assembly with the radial plates)
- double pancake insulation and impregnation
- (cold test of two double pancakes of prototype coil) NOT YET DECIDED
- winding packs
- stacking of double pancakes
- ground insulation and vacuum pressure impregnation
- joint and cooling pipe assembly
- (cold test of winding pack) NOT YET DECIDED

Main EIDI Activities Codes
20901
COMPLETE, LARGE-SIZE (> 50 TONS) SUPERCONDUCTING MAGNETS IN Nb3Sn
20905
YOKES & TOOLING
20906
ACCESSORIES FOR MAGNETS
50100
SUPPLY OF RAW MATERIALS
50200
MACHINE TOOLS, WORKSHOP AND QUALITY CONTROL EQUIPMENT
50600
SHEET METAL WORK / MANUFACTURING TECHNIQUES
50700
GENERAL MACHINING WORK / MANUFACTURING TECHNIQUES
50800
PRECISION MACHINING WORK / MANUFACTURING TECHNIQUES