SLAC Tune Tracker/Feedback

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SLAC Tune Tracker/Feedback

• Mike Laznovsky

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Requirements

• Track tune per plane and per ring
• Move multiknob to maintain tune
• Switch ranges while tracking
• Constant tune or current dependent tune modes

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Tune Space
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Hardware

• GPIBdriven SR830 lock-in amplifier
• Tweaks the beam, watches response
• Works best on non-colliding bunches
• Phase response is almost linear in region of
  interest
• Four devices (LER,HER) (X,Y)

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S/W Implementation

• All IOC support is soft or GPIB
• Fairly flat database
• Three sequence programs per device
• Amplitude Control
• Tracking code
• Feedback code
• One sequence program for VMS synchronization

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General H/W control
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Tune Scan Panel
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PEP-II Tune Scan
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Tracker panel
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Feedback Panel
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Some Results
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SLAC status an aside

• LCLS
• demonstrate injector by 10/2006
• modify SLC timing to accommodate LCLS
• SPPS now working (ANL Undulator)
• VXI PPC (Kinetics) has worked in production
• Supports 4 new PEP Low Level RF boards
• Stephanie from ESD to SPEAR
• Unix infrastructure work Versioning,
  Deployment, Escalation

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More SLAC status

• 8-Pack (NLC Test Accelerator) software in
  commissioning
• Oracle Archiver
• Scalar PV access is about 2x slower than
  file-based access
• Waveform access is very slow
• Changing waveform storage to VARRAY
• Matlab Channel Archiver access(Uses libIO,
  works with traditional files too)