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the chamber, the Levitation Coil (L-coil), made from high
temperature superconductor, magnetically supports the F-
coil. Optical detection of the F-coil position is used to
stabilize the levitation with a digital feedback control
system. In the first year of operation, LDX has been
operated with the F-coil supported while the cyrogenic
operation of the coil is assessed and integration with the C-
coil is completed. Current work focuses on the integration
of the F and L coils as we prepare for first levitation tests.
An overview of the LDX coils will be presented, with
emphasis on the interaction of the three coils in the
levitated system.
THM1OR3
Implications of NbTi short-sample test results and
analysis for the ITER Poloidal Field Conductor Insert
(PFCI)
R. Zanino, L. Savoldi, Dipartimento di Energetica,
Politecnico di Torino; E. Salpietro, EFDA-Garching; D.
Ciazynski, CEA-Cadarache; N. Mitchell, ITER IT Naka; P.
Bruzzone, PSI Villigen; A. Della Corte, ENEA Frascati; K.
Okuno, JAERI Naka; N. Martovetsky, LLNL Livermore; E.
Zapretilina, Efermov St. Petersburg.
Several short (few meter long) but full-size NbTi samples
have been tested in the recent past within the frame of the
ITER activities: the PF-FSJS, in 2002, and the PFCI-FSJS,
in 2004, at the Sultan facility of CRPP Villigen, Switzerland;
the BBIII, also in 2004, at the Toska facility of
Forschungszentrum Karlsruhe, Germany. As the test of the
PFCI is presently foreseen for 2006 at JAERI Naka, Japan,
it is essential to consider in detail the lessons learned from
the short sample tests, as well as the issues left open after
them, in order to develop a suitable test program of the
PFCI aimed at bridging the extrapolation gap between
measured strand and future PF coil performance. Here we
consider the DC performance assessment (Tcs/Ic test), the
quench propagation and the calorimetry of conductor and
joint AC losses, attempting to provide quantitative
predictions for the behaviour of the PFCI during the
corresponding tests, based on the results of the short
samples. In particular, 1) the actual possibility to quench
the PFCI conductor in the Tcs tests before quenching the
intermediate joint will be addressed, taking into account the
recent re-design of intermediate joint and lower
termination, 2) the question of the so-called sudden or
premature quench will be studied, based on Sultan sample
results; 3) the quench propagation will be considered,
based on the BBIII test results; 4) the feasibility of the AC
losses calorimetry will be assessed quantitatively.
THM1OR4
Progress in the Design, Manufacture and Testing of the
Wendelstein 7-X Superconducting Magnets
C. Sborchia, J. Baldzuhn, K. Risse, T. Rummel, H. Viebke,
Max-Planck-Institut für Plasmaphysik.
Moved to WEM2OR6.
THM1OR5
Design Changes and Impact on the Production of the
Non-Planar Coils for the W-7X Experiment
K. Risse, R. Kairys, P. Rong, T. Rummel, C. Sborchia, J.
Tretter, Max-Planck-Institut für Plasmaphysik; N. Valle,
Ansaldo Superconduttori SpA; E. Theisen, Babcock Noell
Nuclear GmbH.
The 50 non-planar coils of W7-X are currently
manufactured by industry and use an especially developed
NbTi cable-in-conduit conductor. The manufacture of the
coils includes production of the superconductors and their
forming into the winding pack, vacuum pressure
impregnation of the insulation and connection of the
electrical joints with a resistance lower than 1 nOhm. Then,
embedding into a cast steel casing, final machining,
assembly of the helium cooling system and the diagnostics
are performed. The coils are cooled by supercritical helium
flowing through the conductors and the cooling systems on
the casing surface. Design changes have been
implemented during the production in the connection areas
of the casings due to more detailed design and structural
work. This has required the reinforcement of welds and remachining
of the coils while production was already in
progress. During the manufacture some improvements
were required to the insulation and the welds in the
termination area. New quench detection cables were
qualified. The casings have been subjected to LINAC
inspections and the detected defects were repaired. In
order to guarantee the insulation quality, high voltage tests
in vacuum under Paschen-minimum conditions have been
added. This paper will give an overview on the status and
schedule of coil fabrication and describe the design
changes and improvements to the manufacturing
techniques.
THM1OR6
Test results of a CICC with advanced Nb3Sn strands,
prototype of the fusion dipole conductor
P. Bruzzone, B. Stepanov, R. Wesche, EPFL-CRPP; A.
Portone, E. Salpietro, A. Vostner, EFDA-CSU Garching; A.
della Corte, ENEA.
In the scope of the design activities for a 12.5 T
superconducting dipole magnet, a short length of cable-inconduit
conductor with steel jacket was prepared in spring
2005 as a pre-prototype of the high field dipole conductor.
The small, rectangular CICC uses for the first time
“advanced” Nb3Sn strands, with jc = 1100A/mm2 at 12T,
4.2K, also planned to be used in the qualification samples
for the ITER conductors. At CRPP, a hairpin sample for
SULTAN has been prepared from the short conductor
length, heat treated and instrumented. The test program
included pressure drop, ac losses and full dc
characterization before and after cyclic load. To correctly
assess the CICC performance, an accurate discussion of
the available strand results and scaling law is presented.
Opposite to other sub-size Nb3Sn CICC’s tested in
SULTAN, the performance of the prototype dipole
conductor is roughly in line with the strand performance.
PARALLEL SESSION 10:30 – 12:20
(Ponente/Levante room)
ENERGY STORAGE
THM2OR1
Field testing of the largest Italian SMES
L. Ottonello, P. Albertelli, P. Ferrari, E. Picco, Ansaldo
Ricerche spa; G. Masciarelli, S. Rossi, Outokumpu Copper
Superconductors Italy spa; L. Martini, C. Pincella, CESI
spa; E. Torello, Electrical Engineering Department,
University of Genova; A. Martinolli, ELETTRA, Sincrotrone
Trieste.
The industrial prototype of a Superconducting Magnetic
Energy Storage (SMES), sized to deliver 1 MW for 1
second, was designed and constructed as result of a
research project, partly funded by the Italian Ministry of
Education, University and Research. After successfully
undergoing factory test, the SMES was erected in 2004 at
the Elettra Synchrotron Light facility in Trieste-I and is there
achieving full operation as protecting device from
119 MT-19 2005, Genova