Kazuo Kuroishi

Generation of magnetic fields over 20 T using a newly developed superconducting magnet system

In February 1992, a newly developed superconducting magnet system at the National Research Institute for Metals accomplished generation of a magnetic field of 20.3 T in its clear bore of 44 mm in diameter. The authors give an outline of the magnet system together with the operation results. The required time to cool down from 4.2 K to 1.8 K was about 4 h. The operations carried out at 1.8 K proved that saturated superfluid helium can be applied as coolant for large scale superconducting magnets because no problems, such as a discharge in the coils, were observed even when quenches occurred. This magnet system may be useful for testing coils of new high-field superconductors.<<ETX>>

Design and performance of beamline BL-8 at the photon factory

Abstract We designed and constructed beamline BL-8 at the Photon Factory, the National Laboratory for High Energy Physics. The beamline has been in full operation since 1987–1988. On this beamline, one can utilize the synchrotron radiation from a bending magnet in the 40 eV to 35 keV energy range. The beamline has three branch beamlines (8A, 8B, and 8C) where one can perform a wide scope of researches: e.g., soft X-ray spectroscopy and photochemical reactions on 8A; XAFS on 8B; lithography, microscopy, and micro-tomography on 8C.

Development of 20T Large Bore Superconducting Magnet. (III). Operation Results.

A 20T large bore superconducting magnet has been developed at the National Research Institute for Metals. In this paper, operation results of this magnet are reported. Cooling down to 1.8K was successfully carried out. Magnetic fields of 15T in a 314mmφ chamber, of 18.06T in a 160mmφ bore and of 20.33T in a 44mmφ bore could be generated. Even after the quenches of two inner coils, they could be re-energized immediately. This fact indicates that this magnet provides an ideal environment for high-field coil experiments. Operation results also proved that saturated superfluid helium can be applied as a coolant for large scale superconducting magnets.