Final results from the SRC plane grating monochromator

A high resolution, high throughput plane grating monochromator (PGM) has been completed and is now in use by experimentalists at the Synchrotron Radiation Center (SRC). The initial characterization of the beamline was performed using a flawed grating. The original grating has been replaced with a new laminar profile 1200 l/mm grating. A resolving power of 36000 at 21.6 eV with no significant beamline aperturing was achieved. This agrees well with the expected value and surpasses the best measurements made with the first grating. Experimentalists are also enjoying high throughput levels due to a factor of nearly four increase in the first order grating efficiency. A permanent magnet undulator continues to provide a stable source for the beamline and users can now scan the beamline and undulator together from 21 to 245 eV at a ring energy of 800 MeV with no limitations.