title: A new beamstop for microfocus X-ray capillary beams.
abstract: In order to accurately measure the photon flux and to assist in aligning the beam, we have designed a modified beam stop device based on a photo diode integrated with the beam stop. The beam stop contains a small CdWO(4) crystal that completely stops the X-rays and at the same time produces photoluminescence proportional to the X-ray flux. The light is then guided to a photosensitive diode, using a flexible light pipe, to monitor the flux. With this device we achieve the goal of stopping the primary X-ray beam and simultaneously monitoring the X-ray intensity, thus eliminating the need for integrating ion-chambers into the capillary or collimator mount.
authors.affiliation: Cornell University, Macromolecular Diffraction at CHESS (MacCHESS), Cornell High Energy Synchrotron Source, Ithaca, NY 14853.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Englich
authors.forename: Peter
authors.initials: P
authors.lastname: Revesz
authors.forename: William
authors.initials: W
authors.lastname: Miller