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WEPE13 |
Design and Performance Evaluation of the Next Generation Beamlines at New KEK Light Source (KEK-LS) | |
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| KEK has been operating two SR sources, the PF-ring and the PF-AR, for about thirty years. We have made a proposal of constructing a new SR facility, tentatively called KEK light source (KEK-LS). An extremely low-emittance storage ring based on the hybrid multi-bend achromatic (HMBA) lattice has been designed as a successor of the aged two rings. The undulator brightness almost approaches 1022 or exceeds 1022 in the soft X-ray to hard X-ray region. It is higher by two orders of magnitude than those of present 3rd generation light sources and by four orders from the PF-ring. The coherent fractions reach 10 % and 1 % at 1 keV and 10 keV, respectively. The KEK-LS will serve as the platform to advance the frontier of science using nanobeam, high-energy resolution beam and high coherent beam. We are conducting necessary studies to fully utilize the high brilliance beams emitted from KEK-LS. We designed beamline optics systems at 1 keV and 10 keV, respectively, and evaluated the beam performance. Also, we are making careful considerations as for the state-of-the-art technology of optics elements. Here, we present the typical beamline designs and the performance by lay-tracing simulations. | ||
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WEPE32 |
Floor Reinforcing Works and Evaluation for Improving an X-ray Beam Stability at KEK PF | |
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| Recent macromolecular crystallography beamlines are targeting smaller crystals. Minimum crystal size is now less than 10 microns. Microfocus beamline is one of essential tools for the structure determination using such smaller crystals. At microfocus beamline, more stable beam operation is required. BL-17A is a macromolecular crystallography beamline at the Photon Factory in Japan and was renewed for structural studies using smaller crystals in summer shutdown of 2014 and 2015. In order to reduce the vibration defect originated from the experimental hall floor, we have reinforced a particular section of the floor, where the main optical components of BL-17A are placed. The thickness of the concrete of the floor was increased from 200 mm to 500 mm with more dense reinforcement grid and the new concrete was tightly connected to the floor frame. To evaluate the effects of the floor improvement, we measured the distortion of the floor by weighting with an autocollimator and observed the fluctuation of the beam position and intensity by dropping a weight around the beamline. The results showed that the beam stabilization was sufficiently improved after the reinforcing works. | ||
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