Open AccessAdaptive indirectly cooled monochromator crystals at HASYLAB
Author(s) -
SchulteSchrepping H.,
Heuer J.,
Hukelmann B.
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s090904959701978x
Subject(s) - wiggler , monochromator , beamline , crystal (programming language) , rod , materials science , optics , actuator , bending , thermal expansion , water cooling , optoelectronics , composite material , thermodynamics , physics , electrical engineering , engineering , wavelength , medicine , beam (structure) , alternative medicine , pathology , quantum mechanics , cathode ray , computer science , programming language , electron
The high‐heat‐load monochromator, based on the HASYLAB (Hamburger Synchrotronstrahlungslabor) `Torii' design, has been used successfully for 2 years at the BW2 wiggler beamline. The bowing of the reflecting surface induced by the heat load and water pressure is compensated mechanically. This is achieved by mounting the specially shaped crystal in a bending mechanism and by heat transfer from the directly water‐cooled crystal. We present the latest step in the development of this design. The piezoceramic‐driven actuators are replaced by actuators based on the thermal expansion of copper rods. The direct water cooling of the crystal is replaced by a safer indirect water‐cooling scheme. Characterization results of the crystal are presented. The Si(111) rocking‐curve width at 9.5 keV was measured to be 8.3 arcsec under 500 W heat load.