This paper studies a new nested switching control (NSC) scheme for piezoelectric (PZT) actuators to achieve fast nanopositioning. Conventional PZT controllers typically neglect the actuator saturation nonlinearity for design simplicity but at the cost of reduced performance. By optimizing a quadratic performance cost function that explicitly involves the actuator saturation, the NSC can not onl...

Abstract With forming of an X-ray cavity with a set narrow bandwidth diamond Bragg crystals and by storing recirculating the output amplifier in X- ray so that pulse can interact following fresh electron bunches over many passes thus enabling development full temporal coherence, we will be able to build cavity-based FELs (CBXFELs) such as free-electron laser oscillator (XFELO) regenerative (XRA...

A novel dual-stage nanopositioner control framework is presented that considers range constraints. Dual-stage nanopositioners are becoming increasingly popular in applications such as scanning probe microscopy due to their unique ability to achieve long-range and high-speed operation. The proposed control approach addresses the issue that some precision positioning trajectories are not achievab...