AN ELECTROSTRICTIVE DRIVE FOR FINE-PITCH CONTROL IN DOUBLE-CRYSTAL MONOCHROMATORS

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 electrost rictive actuators have recently been installed to the top crystal in t wo monochromators at the Daresbury SRS to facilitate this. This comple ments the coarser control provided by the existing stepper motor to gi ve an accurate positioning of the crystal alignment over the full rock ing-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 di scussed.