Beam alignment depends on CCD real-time image analysis and processing. In order to improve the quality of the alignment, multiple filters are used in far-field and near-field image processings. These multiple filters are constituted of an average filter and a median filter in different connection sequences, so that they can deal with different kinds of noise. To reduce the effect of the unknown nonlinear relationship between motor running steps and deviation pixels, a feasible methodology is offered to improve this phenomenon and a fuzzy algorithm is applied to the motor feedback control process. Because of the fuzzy control it is not necessary to establish an accurate mathematical model, so the impact of the nonlinear relationship will be reduced.
This paper describes a control system that integrates the beam alignment subsystem and the parameter measurement subsystem of SGII-A facility based on Tango Controls. This is the first attempt to apply Tango Controls to the control system of a high-power laser facility. The new control system employs a hierarchical structure that consisting of a device layer, a task layer, and a GUI layer. Physical devices of both subsystems are developed into virtual device service software, acquiring data while hiding complex instructions from physical devices. Using the Tango soft bus, task applications collect data from the device layer, process the data, and send commands to control physical devices. By taking advantage of Tango's communication protocol, these applications can provide concurrent access. New client GUIs developed using QT and based on Tango's unified interface are more convenient and intuitive.
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