Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN EPICS collaboration meeting 2004 Dec , 2004 RICOTTI, Tokai, JAPAN Pohang Accelerator Laboratory Kiman Ha, M.Y.Oh, J.H Kim, J.M Kim and J.H Choi PLS Power Supply control and upgrade plan

Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN Outline -Status of orbit feedback -Present status of power supply control -Digital power supply upgrade plan -Hardware review and test result -Summary

Pohang Accelerator Laboratory POSTECH Orbit feedback status EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN -Orbit feedback operation started for user service in November -Orbit stability with feedback(RMS) - short term (1 hour) : < 1  m - long term (12 hours) : < 3  m -Both V and H corrector PS’s are involved for feedback

Pohang Accelerator Laboratory POSTECH Present PS upgrade status -Upgrade status.Kept vertical Orbit Stability less then 3  m by feedback operation.Replaced 22 sets of Corrector PS and their Control system in September -EPICS Control and embedded controller.Collaboration with BESSY-II (Ralph, Ingo) and Kristi(SLAC).Same as BESSY-II, 24Bit DAC Controller.CANbus field bus with EPICS IOC.Event System for PS time synchronization EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN

Pohang Accelerator Laboratory POSTECH Next plan of power supply upgrade EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN -Requirements of corrector PS.Fast Corrector control system(>1kHz).Vertical PS need 20bit of step resolution.Horizontal PS need 16bit step resolution -2005, will replace all vertical PS. 2ppm step resolution. +/-10ppm long term stability -Feed-forward for ID gap changed.Install steering magnet.+/-5A 16bit 1kHz bandwidth PS

Pohang Accelerator Laboratory POSTECH Fast Control System requirement EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN -PS : >1kHz BW, > 18bit output resolution - 1 to 5kHz set point -Event system synchronization >BPM measurement >PS control trigger -Fast beam position and feedback algorithm processing

Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN Background of Digital PS development - Implementation of modern power converter technology.Resent DSP&FPGA show very powerful performance - Requirements of beam physicists for orbit stabilization.Slow, fast, and epics based robust control system -High speed control applications: >4kHz - High output resolutions: >18bit - Low cost and small number of hardware components.Reduce error source.Easy maintenance

Pohang Accelerator Laboratory POSTECH Digital Controller Advantage EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN -Modern digital technology(DSP, FPGA,ADC) -Cost effective and precise power supply -High flexibility and modularity -High functionality -Built in all functions for PS.Current regulator(PI, feed forwarder).Direct PWM generation.Fast control port.Analog, Digital I/O

Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN Analog- Digital- Converter 8 Analog Input 2 Analog Output DSP-controller incl. FPGA 16 Bit Digital Out 8 bit Digital Input 1 RS232 1 Fiber optics Digital Control Unit

Pohang Accelerator Laboratory POSTECH Block diagram of Controller Card without software functions EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN From PSI Lukas Security controller (Watchdog) 24 V 5 V BUS SHARC DSP ADSP-21065L SRAM 2 MBit FLASH EPROM 8 MBit Flags, IRQs, Reset EPROM FPGA CLOCK 60/30/20MHz Control-IO serial link RS 232 Power Inverter Section Analog & Digital Signal Feedback PWM PWM signal PWM synchronisation SoC / SPARE / ADC clock (200 kHz) Service PC SPORT 1 (serial port) SPORT 0 (serial port) Power Monitor Reset PWM generator IO- controller ADC/DAC Card Trigger /Reset /Interrupt Backplane D SUB 15 Control System (EPICS) optic FPGA fast optical input for Trigger /Reset /Interrupt DC other DSP Controller Cards Analog Sig. JTAG digital Input / Output optic Timer

Pohang Accelerator Laboratory POSTECH Prototype of Digital PS for PLS EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN Filter IGBT driver DCCT Power Stack DSP RS232 ADC Optical fiber for EPICS interface.+/-100A.DC 30V

Pohang Accelerator Laboratory POSTECH IOC control test EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN Fiber optics VIPC664 TM Digital PS IOC Test panel

Pohang Accelerator Laboratory POSTECH IOC and PS configuration EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN VME CPU Carrier moduleTM module PS IP-A IP-B IP-C IP-D Optical fiber link MVME5110 VIPC664-TM Event trigger CH1 CH2 PS PS 1 PS 8 PS 2 EVR

Pohang Accelerator Laboratory POSTECH Control hardware components EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN VIPC664-TM IP2 TM

Pohang Accelerator Laboratory POSTECH Step response test EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN 55.0A A Step 100uA step(1ppm) full range V*10 is Amps

Pohang Accelerator Laboratory POSTECH Summary - The PLS orbit feedback operation is based on EPICS control system. -CANbus IOC and control are working well without any problem -Satisfactory result of prototype Digital controlled PS -Next Digital PS will be operated for orbit feedback -This high performance PS technology will be helpful for our new project, 4 th generation PAL-XFEL EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN

Pohang Accelerator Laboratory POSTECH Overview EPICS Collaboration Meeting RICOTTI, Tokai, JAPAN PLS(Pohang Light Source) has successfully upgraded storage ring straight section 20bit power supplies and control system for global orbit feedback operation in collaboration with BESY-II. Now we are looking for EPICS based fast control system and cost effective precise digital controlled power supply in collaboration with PSI and DIAMOND. I will present the current status of PLS global orbit feedback system, and experimental results of 1ppm resolution digital controlled power supply for the next upgrade of PLS.