IN-VACUUM UNDULATOR CONTROLLER DESIGN FOR SSRF

Two 25mm period in-vacuum undulators (IVU25) have been installed in SSRF 3.5 GeV storage ring. The controller for IVU25 based on Siemens S7-300 PLC is used to control two stepper motors for the gap and tapper of magnetic pole array. The controller monitors cooling water’s temperature and flux, monitor the array’s temperature, too. And configure Ethernet access for remote control as well as MPS and PPS interlock. A simple user interface supports routine operation and detail information is showed at cascading windows. With real time feedback of the linear absolute encoders (LAEs) the tracking precision of gap and taper are less than 1 micron. This paper describes the design of controller hardware and software.

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