PhysicalQuantity Based Control Systemfor HLS-Ⅱ And Related Application Researches

After a major upgrade, the Hefei Light Source was brought into operation in Jan. 2015. The upgrade light source is renamed as HLS-Ⅱ. The physical quantity based control system and its high level applications had a major contribution to the success of the commissioning and stable operation of the light source.The physical quantity based control system developed for the HLS-II directly controls the physical quantities of the accelerator elements, including the magnetic field of various magnets and the beam energy, etc., leading to direct controls to the parameters of the accelerators and the electron beam. The physical quantities and related engineer quantities are automatically converted inside of the control system, and can be shared by different high level applications. This significantly improves the feasibility and effectiveness of the system. This system have been well serving the commissioning, machine study and operation of the HLS-II light source.This dissertation first discusses the hardware and software structure of the HLS-II control system, then reports the details of some critical functional modules of the system, including conversion between physical and engineer quantities, synchronization of the records for physical quantities, hardware sharing between different functional modals. The physical quantity based control system simplifies numerous control processes, realizes data sharing of the physical quantities, and makes it convenient to adjust the accelerator parameters.Based upon the HLS-II control system, we developed a number of high level applications for machine commissioning and operation. This dissertation reports some critical applications, including the energy matching between the injector and the storage ring, lattice calibration and optical parameter correction for the storage ring, lattice compensation for the insertion devices (IDs), and the storage ring orbit feedback.The response matrix measured using BPMs and correctors is used for the lattice calibration, optical parameter correction and lattice compensation for IDs of the HLS-II storage ring. Some modifications are performed from the traditional fitting methods to meet the standard of the HLS-II control system. The functional module, hardware sharing, is used for the lattice correction and ID compensation.High orbit stability is required by synchrotron light sources. Developing an orbit feedback software for gaining high orbit stability is one of our tasks. This dissertation discusses the principles and methods of the orbit feedback, reports the improvements of the static and dynamic properties of the orbit corrector power supplies, and presents the measurement the golden orbit, the quadrupole centers, for the orbit feedback. The development of the orbit feedback software is also presented in this dissertation. Using this system, we have archived a long term orbit stability (RMS) better than 4μm, which is close to that of the third generation synchrotron light sources.The HLS-Ⅱ physical quantity based control system realizes direct control to the physical parameters of accelerators, which is the first case in China. The high level applications developed based upon this system play an important role in the light source commissioning, and are providing strong supports for stable and high performance operation of the light source.