The ITER toroidal field model coil project

192 A. Ulbricht et al. / Fusion Engineering and Design 73 (2005) 189–327
itoring techniques, particularly for the insulation
quality.
The TFMC and its test arrangement were designed
to be representative for the ITER TF coil in respect of
layout and electrical and mechanical stresses [24–27].
The layout of the TFMC overtook as many as possible
features of the ITER TF coil design on a scale
nearly 1:1. Only the overall dimensions had to be chosen
in a way that the TFMC assembled together with
the already existing EURATOM LCT coil fitted into
the TOSKA facility of the FZK/ITP at Karlsruhe [28].
The construction and test of the TFMC was the
main part of one of the seven large R&D projects of
the ITER EDA [29]. The TFMC has been conceptually
designed by the EURATOM Associations CEA
Cadarache, ENEA Frascati and Forschungszentrum
Karlsruhe (ITP) under the coordination of EFDA-CSU
Garching (the former NET Team). The work sharing
between the laboratories was adapted according to their
experimental facilities as well as their expertise in the
different fields and special skills for assistance during
the construction and the preparations for the test [20].
A consortium of European companies, called
AGAN (Accel, Alstom, Ansaldo, Noell) developed and
performed the engineering design and manufacture of
the TFMC under the surveillance of the EFDA-CSU
Garching on behalf of EURATOM, in tight collaboration
with the mentioned associations. The conductor
was manufactured by Europa Metalli in separate contract
and provided by EFDA-CSU to the AGAN consortium.
The work sharing within AGAN was as follows:
Accel Instruments: Design calculations, technical
project and quality management.
Alstom: Winding pack assembly, manufacturing of
coil case and superconducting bus bars, final coil
assembly and instrumentation.
Ansaldo Superconduttori: Double pancake module
fabrication.
Babcock Noell Nuclear: Design calculations, commercial
management, structural components (radial
plates, intercoil structure), related instrumentation,
and assembly of the test configuration at TOSKA site.
The TFMC construction phase was accompanied by
seven review meetings over 5 years within the international
ITER collaboration.
The test of the TFMC was conducted by the Coordination
Group consisting of the EU project manager
as chairman, delegates of the ITER partners, ITER
International Team and the test-hosting laboratory. The
Group was supported by two experts groups (Test &
Analysis and Operation Group), consisting of association
staff, which prepared, performed and evaluated
the test.
The testing in TOSKA facility at FZK Karlsruhe was
supported by participation of scientists representing all
ITER partners (EU, JA, RF, US) and ITER central team.
3. Toroidal field model coil layout and
manufacture
3.1. Layout of the TF model coil
3.1.1. TFMC Project objectives and layout
The special coil design (Fig. 3.1) with a circular
Nb3Sn cable in conduit conductor placed into the spiral
grooves of the 316LN stainless steel (SS) radial
plates required the development of new manufacturing
methods including the associated tooling. This has
been described in several publications [30–34]. The
design, manufacture and quality assurance (QA) results
are described in detail in [35].
The ITER TF Model Coil design parameters and the
main operating data are shown in Tables 3.1 and 3.2 in
comparison with the ITER TF coils.
Table 3.1
ITER TF model coil design parameters
Properties ITER TF TFMC
Conductor diameter [mm] 43.4 40.7
Nominal turn insulation
thickness [mm]
1.25–2.0 2.5
Nominal DP module
insulation
1.0 1.5
Total insulation between
DP modules [mm]
∼5.0 ∼4.0
Ground insulation
thickness [mm]
8 8
Number of DP modules 7 5
Total number of turns 134 98
Winding min. radius [mm] 500 600
Case thickness [mm] 75–240 70–80
Overall dimensions [m] 14.7 × 8.5 × 1.4 3.8 × 2.7 × 0.77
Mass per coil [t] ∼340 ∼40