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The beamline for the circularly polarized synchrotron radiation at the 6-Ge V Accumulation Ring for the TRISTAN project is now under construction. The insertion device of this beamline was designed to produce circularly polarized x rays at the photon energy range of200 e V-I 00 ke V. The beamline is divided into the following three branches: ( 1) High resolution Compton scattering and magnetic Compton scattering experiments; (2) mUltipurpose experiments such as magnetic x-ray scattering and magnetic x-ray absorption; and (3) completely circularly polarized soft x rays.

Articles you may be interested inDesign of high heat load whitebeam slits for wiggler/undulator beamlines at the Advanced Photon Source Rev. Sci. Instrum. 66, 1792 (1995 10.1063/1.1146464 Thermomechanical analysis of the whitebeam slits for a wiggler/undulator beamline at the Advanced Photon Source Rev.Design and experience of the initial operation of a new beamline (BL-16) for a 3.6-m-long, 53pole wiggler/undulator constructed at the Photon Factory are described. The insertion device has hybrid permanent magnets with a period of 12 cm and a maximum magnetic field of 1.47 T. In the undulator mode, the energy of the fundamental peak can be varied from 40 to 400 e V. In the wiggler mode, an x-ray beam (critical energy of 6 ke V) 50-100 times more intense than that from the bending magnets is obtained. The beamline consists of two time-shared branch lines; a side beamline for soft x-rays in the undulator operation, to which photon beams are deflected sideways by a cylindrical SiC mirror, and a straight line for hard x rays under the wiggler operation. On the hard x-ray line, a fixed-exit sagittal-focusing double-crystal monochromator has been installed and commissioned. Collimating and refocusing mirrors will be installed in 1989. On the undulator beamline, a soft x-ray monochromator utilizing sophisticatedly devised aberration correction optics is commissioned.

Segmented polyurethane dispersions (SPUD) having carboxyl groups in soft segments (SS) or hard segments (HS) were synthesized. Phase, surface, and interface structures of films made from those SPUD were examined by differential scanning calorimeter (DSC), contact angle, and X-ray photoelectron spectroscopy (XPS) measurements. Segmented polyurethanes (SPU) with the same structures as SPUD were also synthesized in the organic solvent system, and the properties and behaviors of these SPU films were compared with the SPUD films. It was indicated by the DSC measurements that the film made from SPUD having carboxyl groups in the soft segments (S-SPUD) had higher crystallinity and crystal growth rate than the film made from SPUD having carboxyl groups in the hard segments (H-SPUD) in spite of steric hindrance. On the other hand, the film made from SPU having carboxyl groups in the hard segments (H-SPU) had higher crystallinity than the film made from SPU having carboxyl groups in the soft segments (S-SPU). Further, the crystal growth rate of SPU was faster than that of SPUD, regardless of the position of carboxyl groups. These results indicated that the phase structure of SPUD film was affected by the phase structure in the dispersion particle. Surface and interface structure of SPUD film was rearranged with a change of the phase structure. But the degree of this change was higher in the surface structure than in the interface structure.

Reconstruction of the Photon Factory storage ring (PF ring; 2.5 GeV) is now in progress to provide very brilliant synchrotron radiation to users, i.e. the emittance is being reduced by a factor of five. Components, such as the quadrupole and sextupole magnets, vacuum chambers, beamlines and beam-position monitors, are being replaced by new ones in 16 normal-cell sections of the PF ring. The accelerating cavities, injection systems and control systems are also being replaced. Operation will commence when the improvements are completed on 1 October 1997.