# Presentation: 473641

## PLS Power Supply control and upgrade plan

**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**

## Outline

**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**

## Orbit feedback status

**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**

## Present PS upgrade status

**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**
**	****.CAN*****bus***** field bus with EPICS IOC**
**	****.Event System for PS time synchronization**

**EPICS ****Collaboration ****Meeting 2004 @ ****RICOTTI, Tokai, JAPAN**

## Next plan of power supply upgrade

**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**

## Fast Control System requirement

**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**

## Background of Digital PS development

**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 **

## Digital Controller Advantage

**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**

## Digital Control Unit

**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**

## Block diagram of Controller Card without software functions

**Block diagram of ****Controller Card**** without software functions**

**EPICS ****Collaboration ****Meeting 2004 @ ****RICOTTI, Tokai, JAPAN**

**From PSI Lukas**

- Security
- controller
- (Watchdog)

- 24 V

- BUS

**SHARC**
**DSP**
**ADSP-21065L**

- SRAM
- 2 MBit

- FLASH EPROM
- 8 MBit

- 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

- DC

**other**
**DSP**
**Controller**
**Cards**

- Analog Sig.

- JTAG

**digital Input / Output**

- optic

- Timer

## Prototype of Digital PS for PLS

**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**

## Digital PS

**IOC control test**

**EPICS ****Collaboration ****Meeting 2004 @ ****RICOTTI, Tokai, JAPAN**

**Fiber optics**

**VIPC664**
**    ****TM**

**Digital PS**

**IOC**

**Test panel**

## IOC and PS configuration

**IOC and PS configuration**

**EPICS ****Collaboration ****Meeting 2004 @ ****RICOTTI, Tokai, JAPAN**

**VME**
**CPU**

**Carrier module**

**TM 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**

## Control hardware components

**Control hardware components**

**EPICS ****Collaboration ****Meeting 2004 @ ****RICOTTI, Tokai, JAPAN**

**VIPC664-TM**

**IP2**

**TM**

## Step response test

**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**

## Summary

**Summary**

**-****The PLS orbit feedback operation is based on EPICS control system.**
**-CAN*****bus***** 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**

## Overview 

**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. **