LNLS, Campinas, Brazil
In modern 4th generation synchrotron facilities, piezo actuators are widely applied due to their nanometric precision in linear motion and stability. This work shows the implementation of a switching control architecture and a tripod kinematics for a set of 4 piezo actuators, responsible by positioning the short-stroke: the vertical and horizontal focusing mirrors of the Kirkpatrick-Baez mirror system at MOGNO Beamline (X-Ray Microtomography). The switching control architecture was chosen to balance timing to move through the working range (changing the beam incidence on stripes of low/high energy), resolution and infrastructure costs. This paper also shows the implementation and results of the developed kinematics by layers that uncouples short-stroke from long-stroke to fix any parasitic displacements that occur on the granite bench levelers due to slippage during the movement and to match the required beam stability without losing alignment flexibility or adjustment repeatability. The architecture was built between a PIMikroMove set of driver-actuators and an Omron Delta Tau Power Brick controller due to its standardization across the control systems solutions at Sirius, ease of control software scalability and its capability to perform calculations and signal switching for control in C language, with real-time performance to make adjustments to the angles responsible by focusing the beam in a speed that matches the required position stability, guaranteeing the necessary resolution for the experiments.
