Insertion Device Controls at the Advanced Photon Source

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Insertion Device Controls at the Advanced Photon
Source

• Mohan Ramanathan
• June 18, 2003

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Types of Insertion Device

• Undulator - STI Device
• A 2-stepper motor device with the top and the
  bottom jaws coupled together by chains and gears
  built by STI Optronics
• Operated at gaps 11 mm 35 mm
• Undulator - NGSM Device (New Gap Separation
  Mechanism)
• A 4-stepper motor device with each motor
  controlling each end of the top and bottom jaws.
• Operated at gaps 11 mm 35 mm
• EMW Device (Elliptical Multipole Wiggler)
• A 2-stepper motor device with the top and the
  bottom jaws controlled separately.
• Permanent magnets in the vertical plane and
  electromagnets in the horizontal plane
• Normally operated at a 24mm gap
• CPU Device (Circularly Polarized Undulator)
• A fixed gap device with only electromagnets

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Insertion Devices Status

• Currently 20 2-motor (STI) devices, 9 4-motor
  (NGSM) devices, 1 CPU device, and 1 EMW device
• Total of 31 insertion devices located in 27
  sectors around the storage ring
• The rest of this talk will discuss the 2 motor
  and the 4 motor insertion device control system

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Mode of Operation

• The device is issued a command to move to a
  certain gap/energy
• Both ends of both jaws are moved simultaneously
• For taper, one end is kept at a different gap
  than the other end
• The taper angle is limited to 2 mrad, which
  translates to about 5 mm difference in gap
  between the two ends ( 2.4 m long devices)
• At beam loss
• Devices are switched to Operator access
• Devices are fully opened
• After Injection to more than 2 ma
• The devices are commanded to move to their
  previous user gaps which were saved prior to beam
  loss 
• Device is switched back to User access
• Beamlines request Floor Coordinator to set a
  beamline limit on the minimum gap of the device
• Used by the beamline staff for additional
  equipment protection

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STI Insertion Device
2 stepper motors run each end of this device
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STI Insertion Device
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NGSM Insertion Device
4 stepper motors control each end of each jaw
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NGSM Insertion Device
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Insertion Device with Vacuum Chamber
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ID Safeguards Operating Ranges

• Typical operating ranges
• STI Device 11 180mm
• NGSM Device 11 180mm
• The nominal ID gap is set at specified magnet
  poles. This means that due to magnetic tuning
  there may be spots along the structure that are
  higher by 100µm. So, in some cases the total
  clearance between the magnetic array and the
  vacuum chamber may be as tight as 25µm (0.001)
  to either side of the chamber.

11 mm
10.8 mm
10.6 mm
10.4 mm 10.5 mm
10.1 - 10.25 mm
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ID Control System Overview
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ID Control System Layout
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ID Control Interface Logic
VME ID Interface Board Layout
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ID Control Interface
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ID Control System Limit Switch Interlocks

• Logic
• A minimum limit hit at one end stops that end
  from closing any further while inhibiting opening
  of the opposite end of the ID
• A maximum limit hit at one end stops that end
  from opening any further while inhibiting closing
  of the opposite end of the ID
• Prevents ID from crushing the vacuum chamber
• Hard wired limit switches remove AC input power
  from the stepper motor drives

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ID Controls Software Logic - Main
Modular 4 Main parts
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ID Controls Software Logic Global Actions
After Injection..
At Beam Loss..
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ID Controls Software Logic Auto Open
To reduce Front End Heat Loads
When Shutters Close
When Shutters Open
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ID Controls GUI for System Managers
2 Motor Device
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ID Controls GUI for System Managers
4 Motor Device
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ID Controls Software Debug GUI
ID control consists of about 350 records
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ID Controls GUI for Users

• Control of the device is accomplished with 10
  process variable
• Additional 5 process variables are used for
  synchronous Scanning mode.
• Only 8 relevant process variables need to be
  monitored at any time
• Additional monitoring of 10 process variables
   may be useful
• If needed, device can be controlled via a serial
  line

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WEB Access to ID Logs
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WEB Access to ID Logs
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General Control System Information
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Real-time Accelerator Data Distribution
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High Precision X-ray Timing Distribution
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Acknowledgments

• Many thanks to my associates
• Marty Smith
• John Grimmer
• Mike Merritt