Yasuhiro Yasaka

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 superconducting generator having highly stabilized superconducting field winding––70 MW class superconducting generator

The development of a practical superconducting generator has been carried out in Japan since 1988. The authors have developed a rotor with a highly stabilized superconducting field winding and a stator with an air gap winding composed of double transposed copper coils. A series of tests was completed at the end of 1997. The output of 78.8 MW was recorded, which was the highest value obtained to date worldwide. The development of the generator and the test results are described.

Analysis of Permeance Distribution of Rotating Machines Considering Magnetic Saturation

In this paper, the authors propose a method for analyzing the permeance distribution of rotating machines. The proposed method enables consideration of the nonlinear characteristics of iron cores with regard to magnetic saturation. In representing the nonlinear characteristics, the relation between flux density and magnetomotive force is approximated by a power series. Variations in permeance caused by magnetic saturation are calculated by the harmonic balance method. The analytical results demonstrate the capability of the method for qualitative analysis of the saturable higher harmonic characteristics of rotating machines.