title: Improvements toward highly accurate diffraction experiments at the macromolecular micro-crystallography beamline BL-17A.
abstract: BL-17A is a macromolecular crystallography beamline dedicated to diffraction experiments conducted using micro-crystals and structure determination studies using a lower energy X-ray beam. In these experiments, highly accurate diffraction intensity measurements are definitively important. Since this beamline was constructed, the beamline apparatus has been improved in several ways to enable the collection of accurate diffraction data. The stability of the beam intensities at the sample position was recently improved by modifying the monochromator. The diffractometer has also been improved. A new detector table was installed to prevent distortions in the diffractometer's base during the repositioning of the diffractometer detector. A new pinhole system and an on-axis viewing system were installed to improve the X-ray beam profile at the sample position and the centering of tiny crystal samples.
authors.affiliation: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamada
authors.forename: Leonard M G
authors.initials: LM
authors.lastname: Chavas
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Igarashi
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hiraki
authors.forename: Soichi
authors.initials: S
authors.lastname: Wakatsuki
authors.forename: Naohiro
authors.initials: N
authors.lastname: Matsugaki
keywords: beamline; macromolecular crystallography