1. Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN EPICS collaboration meeting 2004 Dec 8 - 10, 2004 RICOTTI, Tokai, JAPAN Pohang Accelerator Laboratory Kiman Ha, M.Y.Oh, J.H Kim, J.M Kim and J.H Choi hkm@postech.ac.kr PLS Power Supply control and upgrade plan

2. Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting 2004 @ 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

3. Pohang Accelerator Laboratory POSTECH Orbit feedback status EPICS Collaboration Meeting 2004 @ 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

4. 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 2004 @ RICOTTI, Tokai, JAPAN

5. Pohang Accelerator Laboratory POSTECH Next plan of power supply upgrade EPICS Collaboration Meeting 2004 @ 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

6. Pohang Accelerator Laboratory POSTECH Fast Control System requirement EPICS Collaboration Meeting 2004 @ 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

7. Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting 2004 @ 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

8. Pohang Accelerator Laboratory POSTECH Digital Controller Advantage EPICS Collaboration Meeting 2004 @ 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

9. Pohang Accelerator Laboratory POSTECH EPICS Collaboration Meeting 2004 @ 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

10. Pohang Accelerator Laboratory POSTECH Block diagram of Controller Card without software functions EPICS Collaboration Meeting 2004 @ 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

11. Pohang Accelerator Laboratory POSTECH Prototype of Digital PS for PLS EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN Filter IGBT driver DCCT Power Stack DSP RS232 ADC Optical fiber for EPICS interface.+/-100A.DC 30V

12. Pohang Accelerator Laboratory POSTECH IOC control test EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN Fiber optics VIPC664 TM Digital PS IOC Test panel

13. Pohang Accelerator Laboratory POSTECH IOC and PS configuration EPICS Collaboration Meeting 2004 @ 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

14. Pohang Accelerator Laboratory POSTECH Control hardware components EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN VIPC664-TM IP2 TM

15. Pohang Accelerator Laboratory POSTECH Step response test EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN 55.0A 55.0001 55.0002 +55.0003 55.0005 55.0004 55.0A Step response @55(A), 100uA step(1ppm) 1ppm @ full range V*10 is Amps

16. 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 2004 @ RICOTTI, Tokai, JAPAN

17. Pohang Accelerator Laboratory POSTECH Overview EPICS Collaboration Meeting 2004 @ 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.