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high resistivity matrix choice will be presented. Critical
currents larger than 500 A have been achieved on these
conductors at 27K, in self field. Results will be discussed in
terms of feasibility of long lengths, and application in SFCL
prototypes.
TUA1OR2
Magnesium diboride Superconducting Strand for
Synchrotron Light Source Applications
E.W. Collings, M. Sumption, F. Buta, M. Bhatia, M. Tomsic,
LASM, MSE, Ohio State University; S. Soltanian, S. Dou,
ISEM, University of Wollongong.
The U.S Dept. of Energy’s long term goal for magnesium
diboride (MgB2) strand intended for accelerator
applications includes current densities up to 1200 A/mm2
in 12-16 T. Such developments will take time, however,
some near-term applications have been identified.
Continually improving properties will enable MgBs, to be
used in the windings of: (i) undulator magnet upgrades and
replacements, (ii) light source bending magnet
replacements, (iii) wiggler magnets, or even (iv) some of
the lower field solenoids of a proposed muon collider.
Hyper Tech Research has installed a manufacturing line to
produce intermediate-to-long lengths of monocore and MF
MgBs strand both with and without SiC doping to increase
the ireversibility field, Birr. and the Jc. Values of Bc2 and
Birr achieved recently in SiC-doped monocores are in the
ranges 28-33+ T and 24-29 T, respectively. Values of
Jc(4.2 K) achieved have been in the range 1.0-3.5
kA/mm2, 6-3 T (undoped 19-fil. strand) and 1.4-6 kA/mm2,
6-3 T (back-extrapolated, SiC-doped monocore); further
improvements are expected. Recent superconducting
undulator (SCU) magnets are calling for strands with Jc/B
combinations such as 1.1 kA/mm2/1.2 T, 1.4 kA/mm2/3.8 T
and 1.2 kA/mm2/5 T,. These specifications, in the light of
the existing performance levels indicate MgB’s potential for
the windings of SCUs. Then next in line could be
superconducting wiggler magnets with their higher field
requirements, as the properties of MgB2 evolve.
TUA1OR3
Progress on the Commercialization of Magnesium
Diboride Superconductors
M. Tomsic, M. Rindfleisch, J. Phillips, J. Yue, Hyper Tech
Research Inc.; M. Sumption, M. Bhatia, E.W. Collings,
Ohio University.
Hyper Tech Research will report on progress that has been
made on developing long length magnesium diboride
superconductor wires. Monofilament and multifilament
wires will be discussed. The progress on making and the
testing of MgB2 coils will be presented. The status of Hyper
Tech Research current demonstration projects for making
MgB2 coils for MRI, motors, transformers, and other
applications will be presented.
TUA1OR4
Behaviour of MgB2 reacted and wind coil from 15K to
35K in a criogenic free apparatus.
R. Marabotto, M. Modica, D. Nardelli, M. Tassisto, Ansaldo
Superconduttori; G. Grasso, Columbus -Lamia; R.
Musenich, INFN.
We have studied experimentally the behaviour of MgB2
reacted and wind pancake, made with Columbus
Superconductors' tape, at several temperatures in a
criogenic free apparatus. The coils made with different kind
of Mgb2 tape ( monocore, multifilamentary, twisted, not
twisted ecc.) were built with different technique.
Measurements of critical current of MgB2 short samples
(taken from long lengh production) in a different criogenic
free test facility, with external magnetic field, are also
shown. A comparison between short sample and pancake
behaviour is reported. Analysis of the quench propagation
for the different coils and for different protection circuit are
also analysed.
TUA1OR5
Current density, Ic anisotropy and mechanical
sensitivity of flat composite superconductors
P. Kovác, I. Hušek, Institute of Electrical Engineering of
SAS.
Flattened composite superconductors have an advantage
of increased fill factor and improved turn’s stability in the
magnet winding. Therefore, flat multifilament NbTi, Nb3Sn,
Bi-2223 and MgB2 superconductors were measured in the
external magnetic fields, at variable temperatures and
different field orientations. Engineering current densities
and angular dependences of critical currents are compared
and discussed. Compared wires were subjected also to
mechanical stresses and their critical current degradation
was measured and analyzed. Obtained data show what
magnetic fields can be generated by these materials used
for the superconducting winding.
TUA1OR6
Simulation of the Effect of Fe-magnetization on
MgB2/Fe Wires
Z. Zhang, X. Li, L. Xiao, Institute of Electrical Engineering,
CAS.
The effect of Fe-magnetization on MgB2/Fe wires is very
significant. The structures of the wires affect Ic, AC loss
and stability, etc. In this paper, to improve the current
carrying capability, the field distributions of several
MgB2/Fe wires with different structures were simulated,
and the results could be used to optimize the structures of
MgB2/Fe wires in production.
PARALLEL SESSION 15:50 – 18:00
(Scirocco/Libeccio room)
Nb3Sn ACCELERATOR MAGNETS
TUA2OR1
Perspectives of Nb3 Sn in Future Accelerator Magnets
P. Limon, FNAL
Practical Nb3Sn superconductor for magnets has been
available since the 1960s. Although it has been used
successfully in many types of magnets, its use in
accelerators has been sparse and problematic, due chiefly
to its difficult mechanical properties and the particular
requirements of accelerator magnet design. Nevertheless,
Nb3Sn has many features that make it attractive for the
accelerators of the future, such as high critical field and
high critical temperature. I will discuss the advantages of
Nb3Sn conductor for use in future accelerator magnets;
present a brief history of attempts at using it in model
accelerator magnets; outline improvements in its properties
over the past decade and recent increased understanding
of its behavior as a practical magnet conductor; describe
some recent technological improvements; and present
recent results on R&D models of accelerator magnets.
TUA2OR2
A short period high field Nb3Sn undulator
demonstration
H.W. Weijers, A. V. Gavrilin, K. R. Cantrell, J. R. Miller,
NHMFL/FSU.
With the ultimate goal to develop a technology suitable for
MT-19 2005, Genova 82