Hiroshi Tomeoku

Accuracy check of TOSCA using a sectoral magnet with saturated iron poles

The calculation accuracy of TOSCA was examined using the 180 degrees sectoral H-shaped dipole magnet model with a maximum field of 2.3 T and strongly saturated iron poles. The measured magnetic field uniformities in the gap between the saturated iron poles agreed with those calculated by TOSCA within the order of 10/sup -3/. When the central magnetic field of the dipole magnet model was low, good agreements within the order of 10/sup -4/ were obtained. The measured magnetic fields in the additional iron yoke placed close to the end of the dipole magnet model were also compared to TOSCA calculations. The agreements were within about 20%. >

Optimal design and field measurements of a dipole magnet model for compact electron storage ring (LSI production)

Compact electron storage rings with strongly curved superconducting dipole magnets were developed as the soft X-ray source for the production of LSI (large scale integration). A dipole magnet model with a copper quasi-cos theta winding was manufactured, and the field distributions were measured. An optimal design technique based on the linear programming and two-dimensional field calculations by the finite element method was applied to determine a coil configuration in a 180 degrees sectoral dipole magnet model. Using this model, good agreement between the measured and calculated field uniformities within the order of 10/sup -4/ was obtained. Moreover, a designed good field region of about 50 mm wide was achieved. This result shows the validity of the design techniques. >

A dipole magnet model for compact synchrotron light source

Compact electron storage rings with superconducting dipole magnets have been developed as the soft X-ray source for the production of LSI (large-scale integration). A dipole magnet model with a copper quasi-cos theta winding has been manufactured, and the field distributions have been measured. An optimal design technique to determine the cross-sectional coil configuration is described here. Results of field measurements and two-dimensional field calculations are also discussed.<<ETX>>

EFFECTS OF POLE NUMBER AND STATOR CORE ON THE PERFORMANCE OF SUPERCONDUCTING MACHINE

Various superconducting machines, which have 2, 4 or 6 Pole numbers, and iron or conducting stator cores, were evaluated. Effects of pole number on damper electromagnetic stress and field airgap flux density were significant, as are effects of the material and position of the stator core on maximum and effective field flux density. From the comparison of the size and performance of various machines having the same output power, it was found that not only machines with an iron stator core but 4 pole machines without a stator core are of potential use.

A superconducting coil indirectly cooled by forced helium flow

Abstract A small superconducting coil is indirectly cooled by a forced flow of helium. The coil, wound from Nb-Ti-Zr multifilament superconducting composite, is 15 mm id, 24 mm od and 30 mm long. The maximum central field is 30.3 kG at 4.2 K. Contact between the cooling tube and the coil is achieved using grease. The experimental results are expressed by a relation of critical current and energizing rate. Typical transient temperatures of the coil and coolant during energizing and after quenching are presented. The analysis shows the design of coils of this type is possible using hysteresis loss and heat conduction analysis.