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Superconducting Magnet Systems Chapter | 5 121

TABLE 5.1 SCs for the ITER Superconducting Magnets: Demand and Supply
TFC PFC CS CC
Superconducting strands Nb 3 Sn NbTi Nb 3 Sn NbTi
Length of SC cables (km) 88 42 62 ∼13
In-cable strands mass (t) 393 237 123 ∼13.4
ITER member country contribution (%)
EU 20 15 — —
China 7 65 — 100
South Korea 20 — — —
Russian Federation 20 — — —
USA 8 — — —
Japan 25 — 100 —

TABLE 5.2 Parameters of Russian First-Generation Superconducting
Strands

Strand Superconducting fibres Critical
Diameter current density Magnetic
2
Facility Material (mm) Number (µm) (kA/mm ) field (T)
T-7 NbTi 1.0 37 96 1.1 5
T-15 Nb 3 Sn 1.5 14.641 5 2.5 5
UNK NbTi 0.85 8910 6 2.5 12

(Russian acronym) accelerating and storage complex operated at the Institute
for High Energy Physics (IHEP; Table 5.2 and Fig. 5.3).
By 2009, the production of world-class winding SCs was re-established in
the Russian Federation through the efforts of VNIINM, the Cable Industry Re-
search Institute (VNIIKP, Moscow), the Efremov Research Institute (Russian
acronym: NIIEFA), the Kurchatov Institute, and Chepetsk Mechanical Plant,
which has the capacity to produce more than 100 t of NbTi- and Nb Sn-based
3
latest-generation strands annually. The company realised the ‘bronze’ process to
manufacture standardised metallic composite Nb Sn strands with 0.15–1.5 mm
3
dia, including 0.83-mm strands for ITER.
At the same time, the Cable Industry Research Institute, IHEP, and the
Kurchatov Institute, in association with NIIEFA, developed equipment
to manufacture and test a new type of ITER winding SC: the multi-stage