Pohang Accelerator LaboratoryPOSTECH
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
EPICS collaboration meeting 2004 Dec 8 - 10 , 2004 RICOTTI, Tokai, JAPAN
Pohang Accelerator LaboratoryKiman Ha, M.Y.Oh, J.H Kim, J.M Kim and J.H Choi
PLS Power Supply control and upgrade plan
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
Present PS upgrade status
-Upgrade status.Kept vertical Orbit Stability less then 3 m by f
eedback operation.Replaced 22 sets of Corrector PS and their Con
trol 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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
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
Pohang Accelerator LaboratoryPOSTECH
Block diagram of Controller Card without software functions
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPANFrom PSI Lukas
Securitycontroller
(Watchdog)
24 V
5 VBU
S
SHARCDSP
ADSP-21065L
SRAM2 MBit
FLASH EPROM8 MBit
Flags, IRQs, Reset
EPROMFPGA
CLOCK60/30/20MHz
Control-IO serial link
RS 232
PowerInverter SectionAnalog & Digital
Signal
Feedback PWM
PWM signal
PWM synchronisation
SoC / SPARE / ADC clock (200 kHz)
ServicePC
SPORT 1 (serial port)
SPORT 0 (serial port)
PowerMonitor
Reset
PWMgenerator
IO-controller
ADC/DACCard
Trigger /Reset /Interrupt
Backplane
D SUB 15
ControlSystem(EPICS)
optic
FPGA
fast optical input for Trigger /Reset /Interrupt
DCDC
otherDSP
ControllerCards
Analog Sig.
JTAG
digital Input / Output
optic
Timer
Pohang Accelerator LaboratoryPOSTECH
Prototype of Digital PS for PLS
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
FilterIGBT driver
DCCT
Power Stack
DSP
RS232
ADC
Optical fiber for EPICS interface
.+/-100A
.DC 30V
Pohang Accelerator LaboratoryPOSTECH
IOC control test
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
Fiber optics
VIPC664 TM
Digital PS
IOC
Test panel
Pohang Accelerator LaboratoryPOSTECH
IOC and PS configuration
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
VMECPU
Carrier module TM module
PSIP-A
IP-B
IP-C
IP-D
Optical fiber link
MVME5110
VIPC664-TM
Event trigger
CH1
CH2
PS
PS 1PS 1
PS 8PS 8
PS 2PS 2
EVR
Pohang Accelerator LaboratoryPOSTECH
Control hardware components
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
VIPC664-TM
IP2TM
Pohang Accelerator LaboratoryPOSTECH
Step response test
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
55.0A55.0001
55.0002
+55.0003
55.000555.0004
55.0A
Step response @55(A), 100uA step(1ppm)
1ppm @ full range
V*10 is Amps
Pohang Accelerator LaboratoryPOSTECH
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, 4th generation PAL-XFEL
EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN
Pohang Accelerator LaboratoryPOSTECH
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.
