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has horizontal type and the support system for this cryostat
must be considered various aspects. Above all, Because
the support length of horizontal type cryostat is shorter than
the support length of vertical type cryostat, the issue for
this system is reduction of heat invasion due to conduction
and effective endurance for self weight and emergency
within short working space for installation. The device for
correction of position after cool-down and charge are
discussed because horizontal type cryostat is generated
transfer of magnetic field center due to thermal contraction
of cryostats. For detailed information related on preliminary
design, The simulation by using ANSYS is also performed
and is considered in view of thermal and structural effect.
POSTER SESSION 13:30 – 15:30
INDUSTRIAL APPLICATIONS (II)
WEA11PO01
Dynamic Characteristics of HTS Bulk Magnetic
Suspension System
Z. Wen, College of Astronautics, Beijing University of
Aeronautics & Astronautics.
A world-wide conceptual design study has been carried out
in support of highly reusable space transportation systems
by using magnetic levitation as launch assistance. The
magnetic levitation technique is regarded as a good
alternative of the next generation of launcher system owing
to its cost-effectiveness and perfect performance. Recently,
a research plan was performed in our lab by constructing a
scale-model suspension system with HTS bulks over a 7
meter Nd-Fe-B track for launch assistance. An
experimental platform was built by means of a mechanical
oscillator to investigate the dynamic stability of PM-HTS
bulk magnetic suspension. The dynamic responses of the
PM-HTS bulk suspension unit were experimentally
recorded and analyzed with the theoretical simulations.
Some technical considerations were discussed in the
paper.
WEA11PO02
Construction and Performance of HTS Maglev Launch
Assist Test Vehicle
W.J. Yang, Z. Wen, M. Qiu, Y. Liu, G.H. Yang, Y.F. Liao,
College of Astronautics, Beijing University of Aeronautics &
Astronautics.
Various maglev launch assist concepts were proposed in
the world for the aim to find low-cost, safe, and reliable
ways to get to space. Among them, high temperature
superconducting (HTS) bulk magnetic levitation platform
was considered as a better one for maglev launch assist
because of its inherent stability both in the vertical and
lateral directions. As a primary work, a demo HTS maglev
launch assist test vehicle was designed and constructed in
our laboratory. The system includes a vehicle body,
permanent magnet guideway with the length of 7 m, the
acceleration and braking parts. HTS bulks were located in
LN2 vessels fixed below the vehicle body. The levitation
force larger than 50 kg was provided by the interaction
between HTS bulks and NdFeB guideway. The HTS bulk
arrangement was optimized by measuring and comparing
static and dynamic levitating characteristics of different
HTS bulk units on NdFeB guideway. The acceleration part
of the system was composed of rocket nozzle and gas
pressure vessel to produce 3g acceleration. The braking
was achieved by a set of linear motors. The experimental
investigation was carried out in the system, and some
results were presented in the paper.
WEA11PO03
Applications of Low Temperature, AC
Superconducting Magnets for Material Processing
H. Kasahara, CRIEPI; S. Taniguchi, K. Ueno, Tohoku
University; S-I. Shimazaki, JST.
We did a fundamental examination of an application for
materials processing using AC superconducting magnets.
Using AC magnets, applied two axis movement magnetic
fields, and stiring melted metals. It can generate a high
density alloy. To applicate AC Superconductor, it is
necessary that (1) thermal insulation technology, (2)
optimizing of magnet shapes, and (3) optimizarion of a
magnet driving conditions. In this paper, we present a basic
examination results.
WEA11PO04
The numerical analysis of magnetic stiffness in a
magnetic levitation
X. Wang, S. Wang, J. Wang, H. Song, J. Zheng, Southwest
Jiaotong University.
A two-dimensional numerical analysis, taking the voltagecurrent
power-law characteristic of the high temperature
superconductor into account, was proposed to calculate
the associated stiffness on a YBCO bulk superconductor
above a permanent magnet guideway when small
movements were produced. The dependence of stiffness
matrix upon the different field cooling position was
extensively studied based on the finite element theory.
Additionally, the numerical technology discussed the
influence of the iron surrounding the permanent magnet,
which is beneficial to the design and optimization of the
high temperature superconductor Maglev system
WEA11PO05
The effect of magnetic force on oxygen bubble during
the oxide crystal growth
J. Park, T. Shimomura, M. Yamanaka, S. Watauchi, I.
Tanaka, Center for Science and Technology, University of
Yamanashi; K. Kishio, The University of Tokyo.
Oxygen bubble in a crystal is inevitable during a
conventional floating zone (FZ) growth of calcium
aluminate (Ca12Al7O33; C12A7), a newly remarkable
material as a transparent electrical conductor. We
investigated the effects of magnetic force on the behavior
of oxygen bubbles during crystal growth of C12A7 because
of the extreme large paramagnetism of oxygen. For the
crystal growth of C12A7 under magnetic field, the FZ
furnace is specially designed and installed with a
superconducting magnet. In this furnace, the size of melt
for the crystal growth is small and the melt position is
variable along the magnet bore; therefore, the direction of
the magnetic force is changeable by the growth position. In
this study, C12A7 crystals were grown at two different
positions, where the magnetic force to oxygen bubbles
works upward and downward, respectively. In the growth
condition when magnetic force was upward, the grown
crystals were half transparent and half opaque due to the
segregation of oxygen bubbles. The number of the
segregated bubbles was reduced as the applied magnetic
force was increased. On the other hands, the crystals
grown under the downward magnetic force were
transparent under higher magnetic field than 5T. Our
results show that the behavior of oxygen bubbles can be
controlled by magnetic force even over 1392 degree of
Celsius, the melting point of C12A7 and that the downward
magnetic force is effective to obtain transparent C12A7
crystals.
MT-19 2005, Genova 110