Plans for nanometer cavity BPM studies

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Plans for nanometer cavity BPM studies

• Energy Spectrometer evaluation (Hildreth)
• Integration with Optical Stabilization System
• Resolution studies
• Multi-bunch performance
• Local Oscillator locking and control

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Summary

• We now have enough information to determine the
  thermal noise limiting resolution for this
  system
• Loss factor
• Electronics performance
• Beam issues
• Comparisons with initial nanoBPM project goals
• Where are we?
• What have we learned?

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TWO YEARS AGO
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Metrology Frame Status

• Carbon fiber frame complete
• Now in test at LLNL should have 0 TCE
• Feeler nanogrid holders complete (9 each)
• Nano grid tested software integration this
  summer
• Will limit range of strut motion (factor 2
  reduction)
• Test internal frame ready next week
• Prepare for shipping to KEK in August
• Chung, Walston, McCormick to install 09.20
• (same trip as kicker laserwire installation)
• Must be modified in place to attach optical
  system
• Completely covers the BPM frame
• Will have a new thermal box 1 x 1 x 800
• This is a very big job that may result in
  internal movement of the cavity BPMs
• Closing motion control loop using SLAC inertial
  development software

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Resolution Studies

• From this ATF visit we can
• Understand measured noise figure
• Raise intensity to 1.5e10
• Test LO locking
• Test incoming beam energy correlation
• Maybe small effect (0.1 G-m 300 n-rad total
  bend)
• Begin comparison with ATF cavity BPMs (one
  working!)
• Test bunch length issues (XCS)
• Next visit

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Cavity BPM studies 12.05

• Electronics studies
• Combined ATF/BINP connection
• Dipole control for precise angle measurements