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A prototype photon-beam-position monitor has been designed, fabricated and tested at the Taiwan Light Source of the Synchrotron Radiation Research Center. Aluminium was chosen as the material of the blade electrodes due to its low atomic number and high thermal conductivity. The resolution of this photon-beam-position monitor was

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An ultrahigh resolution and high-flux undulator beamline U9-CGM, with a cylindrical grating monochromator and covering an energy range from 5 to 100 eV, has been constructed. Two separate entrance slits are included to provide different incident angles, hence to optimize the overall performance. This beamline delivers an average photon flux of 6 ϫ 10 10 photons/ s with the entrance and exit slit openings at 10 m. An energy resolving power of 110 000 with a photon flux of 1 ϫ 10 10 photons/ s was obtained at 16 eV with the 1800 line/ mm grating and at 64 eV with the 1600 line/ mm grating, with the entrance and exit slit openings at 3 and 5 m, respectively. A differentially pumped gas cell is used to attenuate high-order light by up to four orders of magnitude. This beamline will be a powerful tool for research in ultrahigh resolution spectroscopy of atoms, molecules, and condensed matter.

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