A Vibrating Wire System For Quadrupole Fiducialization

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A Vibrating Wire SystemFor Quadrupole
Fiducialization
Zack Wolf, Dave Jensen, Ralph Colon with help
from Alexander Temnykh (Cornell)
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System Accuracy Requirements
Total fiducialization error budget 25 um
Vertical and horizontal errors
Place wire at quadrupole center 10 um Locate
wire relative to tooling balls 15 um Locate
tooling balls on wire detector relative to
tooling balls on magnet 10 um
LCLS PRD 1.4-001
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System Overview
LCLS-TN-05-11
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Place Wire At Quadrupole Center
Similar To Pulsed Wire Technique
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System Under Construction
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Signals
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Set Resonant Frequency
LCLS-TN-05-11
In phase signal
90 degree out of phase signal
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Signal vs Magnet Position Measurements
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Wire Location
LCLS-TN-05-11
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Wire Position Detector
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Conclusion

• A system is being constructed in which
• A quadrupole will be centered on a wire to 10
  microns
• The wire will be located relative to tooling
  balls to 15 microns
• All tooling balls will be located to 10 microns
• The overall fiducialization accuracy in x and y
  will be better than
• 25 microns.
• The magnet pitch and yaw will be smaller than 1
  mrad.
• More tests need to be done repeatability, no
  bias, etc.