title: Beam-position monitors in the X-ray undulator beamline at PETRA.
abstract: At the 12 GeV storage ring PETRA, the first synchrotron radiation beamline uses a 4 m-long undulator. The beamline, with a length of 130 m between source and sample, delivers hard X-ray photons usable up to 300 keV. The photon beam has a total power of 7 kW. Combined with the high brilliance, the powerful beam is very critical for all beamline components. Copper, located at a distance of 26 m, hit by the full undulator beam, melts within 20 ms. Different monitors are described for stable, safe and reliable operation of beam and experiments.
authors.affiliation: Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Hahn
authors.forename: W
authors.initials: W
authors.lastname: Brefeld
authors.forename: M
authors.initials: M
authors.lastname: Hesse
authors.forename: J R
authors.initials: JR
authors.lastname: Schneider
authors.forename: H
authors.initials: H
authors.lastname: Schulte-Schrepping
authors.forename: M
authors.initials: M
authors.lastname: Seebach
authors.forename: M
authors.initials: M
authors.lastname: Werner