1. magnetic confinement - ENEA - Fusione

70
3. FUSION TECHNOLOGY
3.4 Magnets
Fig. 3.7 - ITER toroidal field model coil prior to installation
in the TOSKA facility at FZK.
Forschungszeuntrum Karlsruhe (FZK) Germany in the first
half of 2001 [3.13, 3.14], and a first phase of tests (coil alone)
was carried out during the summer [3.15]. The rated current of
80 kA was successfully achieved; this is the highest current
level to date for a large superconducting magnet. All the other
measured parameters (e.g., joint resistance, current sharing
temperature, stress level, coil deformation, thermal-hydraulic
behaviour) were in fair agreement with the predicted values.
These results represent important milestones on the way to the
construction of the ITER reactor, as they demonstrate that
large high-field superconducting magnets with predictable
properties can be designed and constructed.
The Turin Polytechnic (POLITO) participated in these tasks
under an ITER-EFDA contract: The M&M code was used to
complete the development [3.16] of a multi-step heating
strategy for Tcs measurements on the TFMC, without the
Large Coil Test [3.17]. Five Tcs tests were performed at 80 kA,
one at 69 and two at 57, all ending with a quench and safe
dump of the coil current. The pressure drop in the heated
TFMC pancakes was analysed [3.18]. POLITO also performed
extensive analyses of and validation against data with the
MITHRANDIR code [3.19-3.22], contributed to the first steps
[[3.23, 3.24] in developing the THELMA code (coupled
thermal-hydraulic and EM description of a superconducting
cable-in conduit conductor) and, finally, participated in the
TFCI test campaign.
[3.13] R.K. Maix et al. Fusion Eng. Des. 58-59,
159 (2001)
[3.14] A. Ulbricht el al., Assembly in the test
facility, acceptance tests and first test
results of the ITER TF model coil, presented
at the 17th Int. Conf. on Magnet Technology
(Geneva 2001)
[3.15] D. Ciazynsky et al., Resistances of
electrical joints in the TF model coil of ITER,
presented at the 17th Int. Conf. on Magnet
Technology (Geneva 2001)
[3.16] L. Savoldi and R. Zanino, Extended
analysis of Tsc tests in DP1.2 using M&M,
presented at the 13th TFMC Test and Analysis
Meeting (Karlsruhe 2001)
[3.17] L. Savoldi et al., First measurement of
the current sharing temperature at 80 kA in
the ITER toroidal field model coil (TFMC),
presented at the 17th Int. Conf. on Magnet
Technology (Geneva 2001)
[3.18] R. Zanino and L. Savoldi, Pressure drop
analysis in DP1 @ 4 K, presented at the15th
TFMC Test and Analysis Meeting (Cadarache
2001)
[3.19] K. Hamada et al., Experimental results
of pressure drop measurements in ITER CS
model coil tests, presented at CEC (2001), to
appear in Adv. Cryo. Eng.
[3.20] R. Zanino et al., Pressure drop analysis
in the CS insert coil, presented at the
Cryogenic Engineering Conf. (Madison 2001)
[3.21] R . Zanino et al., Inductively driven
transients in the CS insert coil (I): heater
calibration and conductor stability tests and
analysis, presented at the Cryogenic
Engineering Conf. (Madison 2001)
[3.22] L. Savoldi, E. Salpietro and R. Zanino,
Inductively driven transients in the CS insert
coil (II): quench tests and analysis, presented
at the Cryogenic Engineering Conf. (Madison
2001)
[3.23] L. Savoldi and R. Zanino, Thermalhydraulic
module for the THELMA code,
presented at the Meeting on the Development
of Tools for the Analysis of AC current
Distribution in Superconducting Magnets
(Garching 2001)
[3.24] R. Zanino, L. Savoldi, P.L. Ribani,
Preliminary results on coupling between TH
and EM (conductor) modules for THELMA
code, presented at the Meeting on the
Development of Tools for the Analysis of AC
Current Distribution in Superconducting
Magnets (Frascati 2001)