New Type Superconducting Bulk Magnet by Pulse Field Magnetizing With Usable Surface on Both Sides in Open Space

A new-type of magnet system using high-
$T_ c$
superconducting bulks has been developed, in which two aligned bulk disks are cooled down from the side face by thermal conduction and are magnetized along the
$c$
-axis in turn employing a split-type pulse coil. The temperature rise
$Delta T$
due to the magnetic flux intrusion is relatively small and the trapped field
$B_ T^ P$
is enhanced in comparison with the conventional bulk magnet system based on a solenoid-type pulse coil.
$B_ T^ P=3.20 T$
on the
$ SmBaCuO$
bulk surface at 50 K and
$B_ T^4 mm=1.97 T$
on the vacuum sheath, 4 mm above the bulk surface, have been attained. This type of magnet system, consisting of multi-bulks, with usable surfaces on both sides in open space, can be realized only by use of a split-type pulse coil and has a potential for new application fields.