[en] For Photon Factory Accelerators planned in the National Laboratory for High Energy Physics, designs of a 2.5 GeV electron Linac and a 2.5 GeV storage ring are approaching to the final stage. Contents of the meeting with future users of the synchrotron radiation experimental facilities are presented: the injector and storage ring; and requirements for the beams in soft and hard x-ray regions. (Mori, K.)

[en] In the National Laboratory for High Energy Physics, about two years ago, the requirements of synchrotron light beam in respective measuring instruments were discussed. Then, also the arrangement (lattice) of a storage ring, the nature of synchrotron light beam, a synchrotron light experiment facility and the arrangement of the beam lines were studied. During the period of two years since then, due to the changes in the circumstances, the design of the lattice was altered. Accordingly, the arrangement of the beam lines and of measuring instruments were largely changed. At this point, the results of discussions in various meetings are described, though they may still be subject to future changes, with due consideration to beam, environment and beam lines required for the design of the measuring instruments: (1) storage ring and synchrotron light beam, (2) requirements on small beam size and beam stability, (3) a synchrotron light experiment facility. (J.P.N.)

[en] A system on X-ray dark-field imaging under development and its application is reported. That comprises an asymmetric monochromator and a Laue case analyzer that has a specified thickness for a given X-ray photon energy or wavelength and a sample locating inbetween these. This system uses Si 4,4,0 diffraction for both X-ray optics element in a parallel arrangement. In order to achieve the dark-field imaging condition the Si Laue analyzer should be 1.075 mm in thickness for the X-ray energy of 35 keV. Since this system is very simple one can expect a variety of applications including material science, biology, palaeontology and clinical medicine where a large view area with size of 100 mm x 100 mm is needed. (author)

[en] This report outlines the recent development of radial ray application to medical fields. A radial ray experiment system was constructed in Japan and the joint use of this system has been started since 1983. The linear accelerator (2.5 GeV) and photon factory ring (2.5 GeV) can produce radial rays characterized with high directivities and great intensities over a wide range of wave length. For clinical application, an insertion light source of which critical photon energy is 21 KeV was equipped to it. In 1986, a test beam line was set to Tristan accumulation ring, resulting to regularize the development to its medical use. There is no clinical method for easy and safety diagnosis for coronary artery. The present method in which a catheter is injected into the femoral artery and moved to the coronary one has a great risk. Thus, the development of coronarography through intravenous infusion was attempted to use for early screening of ischemic heart disease. After animal experiments in dogs and the sheep, which have a body width of 300 mm near to that of humans, imaging of the coronal artery was conducted in 3 post-balloon patients and this method was demonstrated to be available for clinical use. (M.N.)

[en] A correlation between an effective oxygen concentration in a reactor recycling system or a reactor coolant cleanup system and an effective oxygen concentration at the bottom of the reactor is preliminarily determined. The effective oxygen concentration is measured in the reactor recycling system or in the reactor coolant cleanup system, maintenance of which is easy, and the effective oxygen concentration at the bottom of the reactor is determined based on the correlation referring to the measured value, and a hydrogen injection amount is controlled so that the effective oxygen concentration at the bottom of the reactor is within a predetermined range. In addition, a correlation between a hydrogen concentration in the feed water system and an effective oxygen concentration at the bottom of the reactor is preliminarily determined. The hydrogen concentration is measured in the feed water system, the maintenance of which is easy, and the effective oxygen concentration at the bottom of the reactor is determined based on the correlation referring to the measured value, and the injection amount of hydrogen is controlled so that the effective oxygen concentration at the bottom of the reactor is within a predetermined range. Then, corrosion such as of equipments at the bottom of the reactor can be moderated, thereby enabling to maintain the integrity of equipment materials. (N.H.)

[en] The report reviews major studies that have been carried out recently by using synchrotron radiation. General features of synchrotron radiation are outlined first, with emphasis on the fact that the number of studies that are performed by using synchrotron radiation has been rapidly increasing since the storage ring, which permits a constant accelerating energy and long, stable operation, came into use as light source. Interactions of material with synchrotron radiation are briefly outlined next, focusing on the application of vacuum ultraviolet light and soft and normal X-rays to the investigation of the structures (behaviors of electrons, arrangement of atoms, etc.) of substances, as well as studies on photochemical reactions and effects of radioactivity. Application of synchrotron radiation to magnetic scattering analysis gives information on the spins of magnetic electrons at unoccupied levels. Attempts have been made mainly in the industry to use synchrotron radiation for fine processing of semiconductors to create large-capacity computer memories. Synchrotron is now used actively in many other research areas including gas-phase photochemistry, spectroscopy and surface physics. (N.K.)

[en] The 5-8 GeV new storage ring projects in Europe and USA are surveyed. Possibility of a project for a new intense source in Japan is also discussed. (author)

[en] Development of an intravenous coronary angiography system using monochromated synchrotron radiation at the Photon Factory is described. This comprises an asymmetric cut silicon monochromator crystal to get a larger exposure area, a two dimensional imaging system using an imaging intensifier coupled to a CCD TV camera and a fast video data acquisition system. The whole system is under development using alive dogs. A future system including a dedicated insertion device applicable to alive humans is also proposed. (author)

[en] A novel lattice spacing measurement using a high-resolution self-reference d-spacing comparator has been described. Self selection of monochromatic synchrotron x-rays by a monolithic double channel-cut-crystal monochromator (MDCM) comprising silicon 2,6,4 and 6,2,4 reflections may lead to a stable, highly-collimated and narrow bandwidth beam. Also if utilizing 2,6,4 and 6,2,4 Bragg planes of a silicon sample, the interval between two associated Bragg peaks for the X-rays with wavelength of 0.13438 nm can be extremely small, so that the diffraction angle can be determined with high precision and the traveling time from one peak to the other can be marvelously reduced by the order of at least three compared to the established classical methods such as the Bond method. Thus this so-called self-reference comparator method can dramatically save measurement time and provide an absolute measurement on the basis of the x-ray wavelength of the MDCM, therefore a lattice spacing measurement with uncertainty of 10^-8, for the 1mm² area on a silicon crystal within measurement time of a few ten seconds and has been achieved. (author)

[en] An experimental station using an X-ray source of an in-vacuum undulator was constructed in the TRISTAN accumulation ring at the National Laboratory for High Energy Physics. The physical experiments have been carried out using this pulsed and highly brilliant radiation. The photon flux density, the beam size and other beam characteristics at the station are described, and some experiments which have been performed in this station are also explained. (author)