Undulator Alignment Concept

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Undulator Alignment Concept Conventional
AlignmentCatherine LeCocq, SLAC October 21, 2005

• Undulator Alignment Concept
• Conventional Alignment Steps
• Instrument and Tooling
• Network Design
• Alignment after Installation

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Current Undulator Alignment Concept

• Fiducialize all possible components
• (Yurii, Zack, Eric)
• Assemble and pre-align all relevant components on
  a girder
• (Robert)
• Build a tunnel network
• Set all girders in the tunnel
• Map all components to verify ab-initio alignment
  for BBA
• Launch monitoring systems
• (Franz, Georg)
• Perform BBA
• (Paul)
• ( ) Presenter

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Conventional Alignment Steps

• Gather all fiducial data and perform tunnel
  network design
• Install tunnel monuments (floor and wall)
• Survey tunnel network
• Mark floor for anchors
• Align floor plates
• Re-survey tunnel network
• Align girder stands (with CAM movers pre-set)
• Survey girders (fully loaded and pre-aligned)

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Instruments and Tooling (1)
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Instruments and Tooling (2)

• Laser Trackers
• FARO SI
• Precise Levels
• Trimble (Zeiss) DiNi12
• Leica DNA03
• Total Stations
• Leica TC2002
• Others
• FARO Platinum Arms (4ft and 8ft)
• Optical Tooling (KE and Brunson Jig Transits,
  KE levels)
• Portable Water Level (in development)
• SLAC Calibration Laboratories
• Sector 10 Horizontal and Vertical Comparators
• Heavy Fab KE Optical Comparator

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Network Design

• Parametric Model
• Stochastic Model
• Least Squares Solution
• Free Net Solution
• Recent Example of Network Design

http//www-group.slac.stanford.edu/met/Align/TechA
nalysis/2004/GLAST-Network.pdf
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Undulator Hall Network

• Warning
• This simulated network is based on very crude
  undulator dimensions. It is made to present
  typical laser tracker-precise leveling network
  capabilities.
• Further studies should involve in particular
  real undulator hall drawing and in-situ
  instrument analysis.
• Simulation facts
• Tunnel dimensions 130 m long, 5 m wide and 2 m
  high
• Quad spacing based on current LCLS deck,
  positioned arbitrarily in the tunnel (1/3 of the
  width)
• Floor is 1.0 m below beamline, wall monuments are
  0.75 m above beamline, laser tracker set-ups are
  0.4 m and 0.6 m above beamline.
• Observation a-priori standard deviations
• Distances 30 µm
• Horizontal angles 30 µm / D
• Vertical angles 50 µm / D
• Height differences 50 µm
• Free network approach

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Undulator Hall Network Simulation
W23 sz 22 µm sx 47 µm sy 46 µm
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Network Simulation Facts

• number of laser tracker set-ups 17
• number of points 49 (16 floor, 33 wall)
• number of triplets173
• number of height differences 81
• number of coordinate unknowns 198
• number of nuisance parameters 51
• number of datum parameters 4

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Example of Single Total Station Set-up
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Undulator Coordinate System

• Definition given in LCLS TN-03-08

x,y,z SLAC linac SLAC-SLC system x,y,z LCLS
Undulator
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Alignment after Installation

• Gather records for last mapping survey and wait
  for BBA to put all quads in line.
• Align the loose end of each girder with respect
  to the next quadrupole.
• Solve the last girder loose end.

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In conclusion, the current undulator alignment
concept is solidifying. The conventional
alignment part is well integrated and relies on
previous experience.
End of Presentation