Open AccessAn electrostrictive drive for fine pitch control in double‐crystal monochromators
Author(s) -
Shard A. G.,
Dhanak V. R.,
Smith A. D.
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/s0909049597014714
Subject(s) - monochromator , stepper motor , electrostriction , optics , piezoelectricity , crystal (programming language) , actuator , acoustics , materials science , computer science , physics , mechanical engineering , engineering , artificial intelligence , wavelength , programming language
Precise control of the pitch angle of the crystals in a double‐crystal monochromator is essential to preserve their accurate alignment while the instrument is scanned. Computer‐controlled piezoceramic electrostrictive actuators have recently been installed to the top crystal in two monochromators at the Daresbury SRS to facilitate this. This complements the coarser control provided by the existing stepper motor to give an accurate positioning of the crystal alignment over the full rocking‐curve width of the crystals. To maintain accurate alignment during a scan, a number of servo feedback options have been devised. In this paper an analysis of the performance of these drives is presented and their utility in a variety of different experimental techniques is discussed.