title: Characterization of an X-ray mirror mechanical bender for the European XFEL.
abstract: One of the classical devices used to tune a mirror on an X-ray optical setup is a mechanical bender. This is often designed in such a way that the mirror is held with clamps on both ends; a motor is then used to put a torque on the clamps, inducing a cylindrical shape of the mirror surface. A mechanical bender with this design was recently characterized, to bend a 950 mm-long mirror up to a radius of curvature of 10 km. The characterization was performed using a large-aperture Fizeau interferometer with an angled incidence setup. Some particular and critical effects were investigated, such as calibration, hysteresis, twisting and long-term stability.
authors.affiliation: European XFEL, Hamburg, Germany.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Vannoni
authors.affiliation: European XFEL, Hamburg, Germany.
authors.forename: Idoia
authors.initials: I
authors.lastname: Freijo Martín
authors.affiliation: European XFEL, Hamburg, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Sinn
keywords: X-ray optics; active optics; bendable mirror; metrology