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TY - UNPB AU - Matsuoka, A. AU - Igarashi, N. AU - Koyama, A. AU - Yamada, Y. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - Floor Reinforcing Works and Evaluation for Improving an X-ray Beam Stability at KEK PF J2 - Proc. of MEDSI2016, Barcelona, Spain, 11-16 September 2016 CY - Barcelona, Spain T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation Conference T3 - 9 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland ER -