title: A new UHV angle encoder for high-resolution synchrotron radiation monochromators.
abstract: The high precision of 0.1 arcsec required for the positioning of optical elements in new two-axes monochromators at the undulator beamlines at BESSY II has led to the development of UHV-compatible high-precision angle encoders. Mounted directly on the rotation axes, they provide substantial advantages over measuring systems connected outside the vacuum vessel. Making use of a fast closed-loop control system, an accuracy of 0.1 arcsec at a resolution of less than 0.01 arcsec has been experimentally verified.
authors.affiliation: BESSY GmbH, Lentzeallee 100, D-14195 Berlin, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Senf
authors.forename: H
authors.initials: H
authors.lastname: Lammert
authors.forename: R
authors.initials: R
authors.lastname: Follath
authors.forename: T
authors.initials: T
authors.lastname: Zeschke
authors.forename: W
authors.initials: W
authors.lastname: Gudat
authors.forename: K
authors.initials: K
authors.lastname: Feichtinger
authors.forename: P
authors.initials: P
authors.lastname: Fischer
authors.forename: W
authors.initials: W
authors.lastname: Hübner
authors.forename: R
authors.initials: R
authors.lastname: Strobel