LCLS Facility Advisory
Committee
October 12-13, 2004
Undulator Controls update
S. Joshua Stein
Argonne National Laboratory
Office of Science
U.S. Department of Energy
A U.S. Department of Energy
Office of Science Laboratory
Operated by The University of Chicago
Undulator Controls : Recent changes
• Scope has been changed slightly since last FAC
- Phase correctors have been eliminated
- Remote operation of quadrupole magnet supports has been
eliminated
- Remote control of cradle motion has been added (“macroscopic”
motion)
- Electro-magnet quadropoles have been specified instead of the
permanent type
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Undulator Controls : Strongback Motion
• Servo motor test at APS
- Purpose: Determine if industrial servo motors are sensitive to
radiation exposure – and if so, to what extent
- Parker servo motor installed within the intra-insertion device
space in sector 3 of the APS during the last run (began in June)
- Dosimeter (alanine) readings taken early August indicated
high absorbed dosage (~8.5Mrad)
- Motor would not respond to commands or motion during any
tests during the June-Aug run
- Shutdown tests indicate certain components within the motor
became activated – further tests lead us to believe the
resolver circuitry was damaged (likely due to the presence of
CMOS electronics)
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Undulator Controls : Strongback Motion
• Considering steppers
- Depending on the mechanical design it may be possible to use
stepper motors for the CAM motion with little or no holding
current
- Recall it was requested we eliminate any holding current if at
all possible to avoid unnecessary heat source within the
tunnel
- By using the Hydrostatic Leveling System and the Wire Position
Monitoring system for motion feedback, (radiation vulnerable)
encoders can be eliminated.
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Undulator Controls : Video (recap)
• OTR Stages
- Acquire and analyze beam
- Position
- Shape
- Size
- 30 Hz capture and analysis rate (possibly up to 120Hz in the
future)
- Large FOV requirement at “reasonable” resolution
- Allows digital “zoom”
- No need for two camera configuration
- Digital interface for frame grabber
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Undulator Controls : Test Stand
• We are attempting to assemble a image analysis test stand
ASAP
- High resolution and high data rate requirements limit the choice
of cameras and image capturing hardware
- PCI based image capturing systems are prevalent and
(relatively) inexpensive
- Current design is considering a PC or Mac based host
(running a soft IOC) with a PCI frame grabber. Tests will
indicate:
- Upper threshold for data grabbing and analysis
• Can we do this at 30Hz? 120Hz? How Big?
- Correlation with LCLS time-stamp data
• How to receive the events?
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Undulator Controls : Magnet Supplies
• It is still early in the determination of quad supply
•
requirements, but we anticipate the use of LCLS ‘standard’
magnet supplies.
- 34 quads with horizontal and vertical components
- DC (non-pulsed) supplies
- Low power
Cabling has to be estimated along with additional heat load to
the tunnel
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Undulator Controls : Conclusions
• Video test stand goals
- Begin prototyping a video capture system for the OTR diagnostic
- Camera choice
- Capture options
- Software model
- Awaiting spending authority for hardware (~$16K)
- Host (Dual G5) [$5K]
- Camera (2Mp, 12bit) [$5K]
- Capture board and supporting hardware [$3K]
- Fiber transceivers and cable [$3K]
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Undulator Controls : Conclusions
• Motion test stand goals
- Strongback cradle Motion tests
- Investigate (campaign for) stepper motor usage
- Assemble test stand and begin development [~$6K]
- Motor [$1K]
- Controller / supply [$1.5K]
- IOC [$3K]
- Software modeling of five axis motion control
- Wire Position monitor specifics
- We need to assemble specifics on how the Wire Position
Monitor and the Hydrostatic Leveling system will integrate
into the control system
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End of slides – supporting materials follow
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Imaging notes
• Capture board – Active Silicon
- Phoenix model
(http://www.activesilicon.co.uk/products_fg_lfg.htm)
- PCI interface
- Connect to host Macintosh – development with GCC
- Run softIOC for EPICS connection
- Initial tests encouraging for 30Hz high resolution (640x480)
analysis
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Imaging notes
• Camera – Imperx Inc.
- MDC 1600 (http://www.imperx.com/)
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Motion notes
• Drive / Controller
- Compumotor Gemini GV6K (servo) or Gemini GT6K (stepper)
- Serial / Ethernet interfaces
- Integrated drive
- Encoder / resolver interface standard
- http://www.compumotor.com/wwwroot/literature/pdf/Gem6K_flyer.pdf
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Undulator Assembly
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Undulator hall : Entrance section
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Undulator hall : Exit section
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Undulator hall : Long break
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Undulator hall : Short break
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