1. LCLS EPICS Control Software Ron Chestnut, Ron Akre, SLAC Ned Arnold, Josh Stein, APS April 24, 2002
EPICS at SLAC
EPICS/SLC Controls Co-existence
LCLS Injector Support
LCLS Timing
RF Stability Feedbacks
Undulator Support
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

2. Present ESD EPICS PEP-II RF – 8 VXI-based stations
Bunch Injection – VME in PEP-II Region 6
Bucket-wise luminosity monitor
Damping Ring RF – Allen Bradley support
NLC Test Accelerator – 2 VME stations
60/120 Hz pulsed operation
Other SLAC EPICS Projects
Longitudinal Feedback – John Fox’s group
SPEAR III upgrade (Ongoing)
BaBar – Slow control – many IOCs.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

3. ESD EPICS Devices Allen Bradley – DCM-based
GPIB – ethernet LAN and Industry Pack
Shared Memory – Bit3
CAMAC hardware and drivers from TJNAF
VSAM – BaBar and NLCTA
ADC, TDC, DAC, Dig. I/O – NLC Test Accelerator
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

4. Current ESD Epics Projects
NLC 8-Pack Support
Next Step for the NLC Test Accelerator
New ADCs, RF Control
General GPIB support
Replacing HPUX-based GPIB support
PEP-II Tune Tracker
GPIB-based application with sophisticated application
PEP-II RF upgrade
More RF stations, enhanced VXI RF modules
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

5. SLC Hardware Architecture
SCP
SCP
…….
Ethernet
Central Architecture
Limited peer-to-peer
Monolithic user interface (SCP)
MCC
Alpha
SLCnet or Ethernet
Kisnet
Micro
Micro
……………..
Micro
Camac
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

6. SLC Software Architecture
CUD
SCP
SCP
code
CUD
code
Micro DB
DBEX
MCC
Alpha
Memory resident DB
Micro
Job
Module in CAMAC
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

7. EPICS Hardware Architecture
OPI
OPI
OPI
Ethernet
IOC
IOC
IOC
Totally distributed. Each IOC (micro) or OPI(workstation) can communicate with all others. Each OPI and each IOC run different programs.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

8. EPICS Software Architecture
Display or CUD
Workstation can be OPI
or virtual IOC
IOCs have hardware
And support DB
Device support reads modules; Data available through records(PVs). Any code or Epics Data-base can see all EPICS PVs.
Application code
Database
Channel Access
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

9. SLC/EPICS Integration
SLC system can see and modify all EPICS Process Variables via “Portable Channel Access”
Similarly, EPICS can see all (and control some) SLC database items.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

10. SLC/EPICS Interface PCAS SLC World CA EPICS World DBEX MCC
Micro DB
DBEX
MCC
Memory resident DB
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

11. EPICS Tools and Applications
Striptool is now a sine qua non of the control room
Channel Archiver being mated to Oracle for speed and flexibility
VDCT (newest Database Configuration Tool) now treated as a reliable tool.
EDM (newest Display Manager) now available at SLAC for test
Alarm Handler in use, parallel to SLC “SIP” system
Strong core of EPICS developers, growing as we speak.
More infrastructure support and analysis applications will be available for the LCLS.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

12. LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

13. LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

14. LCLS Injector Support IOC at sector 20
Provides SLC -> EPICS Timing Connection
Controls and monitors LCLS source laser
Provides extensive diagnostics (CCD Ring Buffers) for laser system
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

15. LCLS Injector Issues
Our first foray into an EPICS timing implementation.
CCD processing solutions are rapidly evolving. We need to watch closely.
Current plans for RF control foresee an SLC-based solution, even for the RF gun.
This is thought to be a simple linear feedback, so an EPICS-based solution is a distinct possibility.
Additional IOCs would then replace additional SLC Micros in the project. VME crates/modules would replace CAMAC crates/modules.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

16. LCLS EPICS Timing
Most EPICS timing systems are based on the decade-old APS model.
The SLC system provides a 128-bit wide description of “beam code” information.
The LCLS timing requirements are tighter than any simple extension of the APS model.
Significant development will be required in a cooperative effort between Hardware and Software and between SLAC and other labs.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

17. SLAC linac tunnel undulator hall 7 MeV z  0.83 mm   0.2 % 150 MeV
  0.10 %
250 MeV
z  0.19 mm
  1.8 %
4.54 GeV
z  mm
  0.76 %
14.35 GeV
z  mm
  0.02 %
Linac-X
L0.6 m
rf=180 RF
gun
new
Linac-1
L9 m
rf -38°
Linac-2
L330 m
rf -43°
Linac-3
L550 m
rf -10°
Linac-0
L6 m
21-1b
21-1d X
21-3b
24-6d
25-1a
30-8c
undulator
L120 m
...existing linac
BC-1
L6 m
R56 -36 mm
BC-2
L24 m
R56 -22 mm
DL-1
L12 m
R56 0
DL-2
L66 m
R56 = 0
SLAC linac tunnel
undulator hall
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

18. RF Stabilization Feedbacks
RF Input/Output
New hardware to measure phases/amplitude at 120 Hz
Correctors are phase/amplitude adjustments
L0 – Gun plus two klystrons
Each feedback as local as possible
L1 – One S-band, one X-band Klystron
L2 – 28 SLC Klystrons
One feedback for whole L2
L3 – 48 SLC Klystrons
One feedback for whole L3
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

19. Feedback Diagram LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

20. LCLS Undulator Controls
Supplied by Argonne APS - lock, stock, and barrel
Employs and extends designs from LEUTL (Low Energy Undulator Test Line)
All EPICS, 16 VME IOCs
Argonne and SLAC EPICS groups will coordinate efforts during the whole project
Timing
Machine Protection
Networking
Global Feedbacks
EPICS Details
VME Crates, CPU types
Naming Convention
Database and screen design
Commissioning and integration
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

21. Undulator Vacuum Controls
Integrate with COTS vacuum components
Minimize modification of existing hardware
Support multiple devices on single fieldbus network
Custom design when needed
APS designed valve controller
Vacuum interlocks
Low frequency data collection
Short-haul wireless technology (e.g. Bluetooth) may integrate well
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

22. Undulator Motor Controls
High motor count dictates dense control scheme
Costing estimates based on current stepper-driven methods
“Smart Motors” may work well in this application but change overall design
Use of encoders assumed – if not, cost will go down
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

23. Undulator Diagnostic Controls
Diagnostic station
High speed cameras and frame grabbers (>120 Hz) should be available in the near-term
PC Based analysis is becoming industry norm
Allows rapid analysis and easy upgrades
Motor driven mirrors, lens and actuators
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

24. Undulator Power Supply Controls
“Standard” Magnet power supplies controlled via fieldbus
Phase correctors use piezo-electric stages controlled with commercial hardware
Current products do not support large numbers of stages per controller, driving up costs
Investigate custom hardware?
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD

25. Conclusion
We have the expertise to use EPICS successfully for the LCLS
The future of SLAC/ESD is with EPICS; there is a management commitment to support new developments
The APS/SLAC collaboration in the EPICS realm will result in a well-supported LCLS
The new, therefore highest risk, items - EPICS Timing and EPICS-based feedbacks – are well within our reach
The existing SLC/EPICS integration will support the hybrid SLC accelerator enhancements easily.
LCLS DOE Review, April 24, 2002
Ron Chestnut, SLAC/ESD