Abstract
A system of beam position monitors was developed for the plane grating monochromator (PGM) undulator beamline at the Synchrotron Radiation Center (SRC). Two monitors are located in the upstream section of the beamline providing the capability of measuring the transverse angular and spatial motion of the photon beam. The jaws of the entrance slit of the monochromator may also be used as monitors to detect changes in the vertical position of the source. Overall, the system allows measurements of the photon beam position and angle to be done with ∼10 μm and ∼3 μrad accuracy, respectively. The aperture of the monitors can be changed in both the vertical and horizontal direction. Thus, the beam motion can be measured with the highest possible resolution for any value of the undulator deflection parameter K. In addition, the design of the monitors provides the capability of mapping the angular power distribution of the photon beam. The first monitor was installed and successfully tested. The design of the system and results of test measurements are reported.
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