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statistical analysis.
TUA02PO08
Annealing effect on microstructure and
superconducting properties of the V-based Laves
phase superconducting wire synthesized by a RHQ
process
Y. Hishinuma, A. Nishimura, NIFS; A. Kikuchi, Y. Iijima, Y.
Yoshida, T. Takeuchi, NIMS; K. Inoue, University of
Tokushima.
Nuclear burning plasma reactors require high magnetic
field to confine the D-T plasma and maintain the fusion
reaction. A lot of fast neutrons are generated by D-T fusion
reaction. V-based superconducting materials are
interesting as a high field conductor for fusion reactor,
because they show neutron irradiation resistance and low
activation in the fusion neutron irradiation environment
compared with Nb-based superconducting wires. We have
studied V-based Laves phase compound multifilamentary
superconducting wire using the Rapidly Heating and
Quenching (RHQ) process and the simple precursor (Hf-Zr
mixture powder/V matrix composite) in order to improve
both workability and superconducting property. Recently,
we reported that the reaction layer within 10 micron was
formed between powder mixture filament and V matrix after
the RHQ process, and then offset Tc values of asquenched
and post-annealed samples were showed
around 8.0 K up to 4.0 J/mm3 of heating energy density
during RHQ process. The transport Jc values of samples
post-annealed at appreciate temperatures for 10h were
increased remarkably compared with as-quenched
samples, and then Hc2 value calculated by Kramer’s
formula was increased from 14 T to 16 T by additional
annealing. In this paper, the post-annealing effect on both
microstructure and Jc-B property after RHQ process was
investigated.
TUA02PO09
Test of superconductor of BESIII Magnet
Z. Zhu, L. Zhao, S. Huang, J. Zhou, H. Yang, J. Hu, Z.
Hou, C. Yi, IHEP, Academia Sinica; Q. Xu, Technical
Institute of Physics and Chemistry, CAS.
Withdrawn.
POSTER SESSION 13:30 – 15:30
MAGNET DESIGN (II)
TUA03PO01
3D Analysis of Stress Distribution in Force-Balanced
Coils
H. Tsutsui, S. Nomura, S. Tsuji-Iio, R. Shimada, Tokyo
Institute of Technology.
Distributions of stress in force-balanced coils (FBCs) for
the superconducting magnetic energy storage (SMES) are
analyzed numerically by an element-free Galerkin method.
Recently, we had developed the FBC concept using the
virial theorem, and derived a winding pitch of helical coils
as a function of a coil aspect, where a distribution of stress
is nearly uniform and working stress is minimized. A coil
with the winding pitch were named as a FBC with the viriallimit
condition or simply a virial-limit coil (VLC), and its
excellent characters of stress were confirmed by
experiments of a two-layered helical coil which can
simulate arbitrary winding pitch numbers. Measurements of
distributions of stress on the winding form of the coil proved
that a minimum working stress and uniform stress were
achieved under the VLC condition. Although stress
distributions in a FBC were investigated by the finite
element method (FEM) in the previous work, a complicated
structure of FBC requires huge computer resources and
restricts detail calculations. In this work, detailed
distribution of stress in a FBC are evaluated by an elementfree
Galerkin method and compared with the experiments.
TUA03PO02
Laminar Windings
E.Y. Klimenko, ISSSPh, RRC "Kurchatov Institute"; E.
Polulyakh, TRINITI, Troitsk.
Withdrawn.
TUA03PO03
Study on an HTS Coil Cross Section for the
Performance Improvement
S. Ishiguri, M. Yamaguchi, S. Fukui, J. Ogawa, T. Sato,
Niigata University.
It is in particular of importance for HTS coils to secure a
larger central magnetic field, a large stored energy, etc.
with shorter length of HTS tapes. The critical current of an
HTS tape depends on both the flux density and the flux
angle with respect to tapes. In view of this, the
performance improvement of HTS coils is taken into
account with an analytical model. As a coil shape, the
minimum volume coil derived from the Fabry Factor
constant curve is taken up, which is often employed at low
temperature coils. It is necessary to analyze the critical
current of a high temperature superconducting coil in order
to design the optimal cross section of the coil. Therefore
authors measured the critical current and n value of Bi-
2223/Ag tapes at 77 K. Fitting equations of the critical
current and n value concerning any flux density and flux
angle are obtained from the measured tape data. The
current performance of a high temperature
superconducting coil can be analyzed with these fitting
equations. The electric field at the critical current is
calculated in the cross section of the coil and the high
electric field portions are taken off. As a result of this, the
critical current and stored energy density of the coil are
improved. The optimal coil cross section can be obtained
by iterating the above calculation process.
TUA03PO04
Design, Numerical Analyses and Test of a 0.1 MJ SMES
with Low Stray Field
Z.K. Wang, Z. Dong, Institute of Electrical Engineering,
CAS.
A 0.1 MJ Superconducting Magnetic Energy Storage
(SMES) is designed with low stray field by FEM. By
applying a shield magnet, the stray field of SMES is
reduced effectively. By analyzing the magnetic field of
magnet, equipotential line, distributions of magnetic flux
density are obtained. The SMES magnet is tested in the
liquid helium and the calculated results and the measured
results are compared. Based on above analyses, a design
scheme, which has both acceptable technical performance
and low stray field, is derived.
TUA03PO05
Electromagnetic System of the KTM tokamak
A.B. Mineev, A. Alexeev, E. Bondarchuk, E. Cherdakov, V.
Korotkov, S. Krasnov, Y. Krivchenkov, A. Malkov, V.
Yakubovski, D.V. Efremov Institute (NIIEFA); E. Azizov,
Trinity Institute, Moscow.
The KTM magnet system consists of 20 Copper Toroidal
Field (TF) Coils, 6 Poloidal Field (PF) Coils, a Central
Solenoid (CS), 2 Feedback Control Coils and Support
Structures. The TF coils produce a toroidal magnetic field
MT-19 2005, Genova 60