EPICS Collaboration Meeting 2004 @ RICOTTI, Tokai, JAPAN

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PLS Power Supply control and upgrade plan
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_at_postech.ac.kr
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Outline
-Status of orbit feedback -Present status of
power supply control -Digital power supply
upgrade plan -Hardware review and test
result -Summary
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
3
Orbit feedback status

• Orbit feedback operation started for user service
  in November
• -Orbit stability with feedback(RMS)
• - short term (1 hour) lt 1 ?m
• - long term (12 hours) lt 3 ?m
• Both V and H corrector PSs are involved for
  feedback

EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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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 _at_ RICOTTI,
Tokai, JAPAN
5
Next plan of power supply upgrade

• -Requirements of corrector PS
• .Fast Corrector control system(gt1kHz)
• .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

EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Fast Control System requirement
-PS gt1kHz BW, gt 18bit output resolution - 1 to
5kHz set point -Event system synchronization gtBP
M measurement gtPS control trigger -Fast beam
position and feedback algorithm processing

EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Background of Digital PS development
-Implementation of modern power converter
technology .Resent DSPFPGA show very powerful
performance -Requirements of beam physicists for
orbit stabilization .Slow, fast, and epics
based robust control system -High speed control
applications gt4kHz -High output resolutions
gt18bit -Low cost and small number of hardware
components .Reduce error source .Easy
maintenance
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Digital Controller Advantage
-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
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
9
Digital Control Unit
DSP-controller incl. FPGA 16 Bit Digital Out 8
bit Digital Input 1 RS232 1 Fiber optics
Analog- Digital- Converter 8 Analog Input 2
Analog Output
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Block diagram of Controller Card without software
functions
SHARC DSP ADSP-21065L
other DSP Controller Cards
SPORT 1 (serial port)
ADC/DAC Card
SPORT 0 (serial port)
Reset
Security controller (Watchdog)
Trigger /Reset /Interrupt
Power Monitor
SRAM 2 MBit
BUS
SoC / SPARE / ADC clock (200 kHz)
PWM generator
FLASH EPROM 8 MBit
PWM synchronisation
CLOCK 60/30/20MHz
Analog Sig.
Power Inverter Section Analog Digital Signal
Feedback PWM
optic
PWM signal
D SUB 15
FPGA
digital Input / Output
EPROM FPGA
Service PC
JTAG
IO- controller
RS 232
DC
DC
24 V
Control System (EPICS)
Control-IO serial link
Backplane
fast optical input for Trigger /Reset /Interrupt
Timer
From PSI Lukas
optic
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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Prototype of Digital PS for PLS
Power Stack
Filter
IGBT driver
./-100A .DC 30V
ADC
DSP
DCCT
RS232
Optical fiber for EPICS interface
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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IOC control test
Test panel
IOC
VIPC664 TM
Digital PS
Fiber optics
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
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IOC and PS configuration
Event trigger
Carrier module
TM module
EVR
CH1
PS 1
PS
IP-A
CH2
PS 2
VME CPU
IP-B
IP-C
MVME5110
PS 8
PS
IP-D
Optical fiber link
VIPC664-TM
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
14
Control hardware components
IP2
TM
VIPC664-TM
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
15
Step response test
55.0005
55.0004
55.0003
55.0002
55.0001
55.0A
55.0A
1ppm _at_ full range
V10 is Amps
Step response _at_55(A), 100uA step(1ppm)
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN
16
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 _at_ RICOTTI,
Tokai, JAPAN
17
Overview
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.
EPICS Collaboration Meeting 2004 _at_ RICOTTI,
Tokai, JAPAN