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LCLS LCLS-II Survey & Alignment

LCLS LCLS-II Survey & Alignment. International Review for PAL-XFEL Survey & Alignment May 31, 2011 Catherine LeCocq SLAC Metrology Department. SLAC Site. From John Galayda LCLS-II DOE CD-1 Review April 26, 2011. A Five Step Process. Planning Information gathering

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LCLS LCLS-II Survey & Alignment

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  1. LCLS LCLS-II Survey & Alignment International Review for PAL-XFEL Survey & Alignment May 31, 2011 Catherine LeCocq SLAC Metrology Department

  2. SLAC Site

  3. From John Galayda LCLS-II DOE CD-1 Review April 26, 2011 LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  4. A Five Step Process • Planning • Information gathering - Physics requirements - Engineering interfaces - Geodetic aspects • Simulation • Monument Network • Component Fiducialization • Installation • Girder Alignment (if applicable) • Component Alignment • Mapping • Operation Phase • Monitoring (if applicable) • Mapping and re-alignment LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  5. SLAC Instrumentation • Primary Instrumentation: • Automatic Levels: Leica DNA03 • Laser Trackers: FARO Xi (Leica AT401 to be acquired for LCLS-II) • In-house portable wire system • Accessories: • Bar code rods: 2 meters and 0.6 meters long • Tripods: Brunson heavy stands, Kara portable tooling stands • Survey targets: 1 ½” Corner Cube Reflectors (12 per laser tracker) • Field Data Collectors: Paravant and Allegro  • Additional Equipment: • Total Stations: Leica TC2002 and TDA5005 • FARO platinum portable arms (4ft, 8ft, 12ft) • Gyrotheodolites: GYROMAT 2000 • Optical Plummet: Wild NL • GPS Receivers: Leica SR-530 • Laser Scanner: Z+F Imager 5006 LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  6. Software Model • Parametric Model • l = observation vector • x = unknown (or parameter) vector • Stochastic Model • = variance-covariance matrix • = variance factor • Least Square Solution • Free Net Solution LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  7. LCLS-I UH Network Simulation • Tunnel dimensions: 130 m long, 5 m wide and 2 m high • 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 • 49 Points – 17 Laser Tracker Set-ups • sD = 30 μm sh = 30 μm / D sv =50 μm /D sdh = 50 μm W23 sz = 22 μm sx = 47 μm sy =46 μm LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  8. Single TC2002 Set-up sD = 100 μm sh = 50 μm/D sv = 50 μm/D “Plate15” sz = 83 μm sx = 108 μm sy = 72 μm LCLS-I Single Total Station Set-up LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  9. Monumentation Network LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  10. 1‘ stay-clear wall monuments (with removable spherical target) 6’ floor monument (with removable spherical target) UH Monumentation See ESD 1.4-113 Undulator Tunnel Survey Monument Positions LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  11. LCLS-I UH with LCLS-II Undulators LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  12. Observation Schema • Laser Tracker • Adapt observation scheme tested in simulation to real world • 3 triplets per point • Calibrate instrument • Follow observation guidance: • 1 triplet = 2 sets of direct and reverse • Precision Level • Adapt observation scheme tested in simulation to real world • Loop over floor points • Calibrate instrument and rod • Follow observation guidance: • 1 shot = average of 3 readings • Other • Total station • Nadir plummet • Gyrotheodolite • Portable wire LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  13. LCLS-I Network for UH Installation LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  14. LCLS-I Portable Wire Results Impact of wire on standard deviations Impact of wire on coordinates Network of 393 points with the following observation schema: triplets from 69 tracker setups, 465 height differences and 57 offset measurements to two overlapping wires (240m long and 370m long). A-priori standard deviations: Laser Tracker: sD=50 µm, sHz=70 µm/m, sV=100 µm/m Level: sDh=70 µm Offset measurement: sDo=30 µm Extracted from IWAA08 Poster LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011 Network measurements alone Wire measurements included Coordinate change [µm] Sigma [µm] Position [m] Position [m]

  15. Component Fiducialization • Advantage: repeatable references • Methodology: mechanical or magnetic • Tooling Choices: compatible with observation techniques in the field • Instrument: • CMM • Laser tracker • Optical tooling • Robotic arm • Photogrammetry LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  16. Mechanical Fiducialization LCLS-I Tweeter Quadrupole Magnet LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  17. Magnetic Fiducialization See LCLS-TN-05-11 LCLS-I Undulator Quadrupole Magnet • Overall fiducialization accuracy in x and y < 25 µm • 3 Step Process: • Place wire at quadrupole center: 10 µm • Locate wire: 15 µm • Locate tooling balls: 10 µm LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  18. Undulator Fiducilization From Zack Wolf & Georg Gassner LCLS-II DOE CD-1 Review, April 26, 2011 LCLS-I Case: Pointed magnets with same sign poles are added to the ends of the undulator. These magnets have a well defined zero field point in the center. The distance from the measurement axis to the zero field point is determined. A calibration gives the distance from the zero field point to tooling balls on the pointed magnet fixture. The distance from the tooling balls on the pointed magnet fixture to tooling balls on the undulator is measured with a CMM. LCLS-II Case: More fiducials, independent treatment of the jaws, Measurement with laser trackers. Expected accuracy: 30 to 50 μm LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  19. Girder Alignment • Advantages: • Better relative component alignment • Speed up installation phase • Variations: • Individual component adjustment • Mover Mechanism: • Fixed • Remote • Feedback LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  20. LCLS-I Undulator Girder Extract from LCLS TN-08-03: Girder Alignment Plan • The Undulator Girder alignment was carried in 2 steps: • Pre alignment and all connection installation (wiring and plumbing in a staging area (see picture above) • Final alignment in a controlled temperature environment on a CMM LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  21. LCLS Coordinate Measuring Machine • Leitz Reference Model 45129 CMM manufactured in Wetzlar (Germany) • Weight capacity 3000 kg • Measuring range is 0.9 x 1.5 x 4.5 m • Resolution is 0.1 µm • Spatial accuracy formula in µm based on L, the length measured in mm: 2.0 + L/350. • After specific tuning for the undulator segment weight and location on the CMM, the expected accuracy for the undulator segment should be upgraded to: 1.5 + L/500. LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  22. Component Alignment • Timeline: • Template layout • Stand/base plate alignment • Component/girder alignment • Principle: • Solid monument network • Component fiducialization • Local instrument set-ups • Variations and possible difficulties come with the hardware installed: • Clearance around bolts • Mover system centered around their range • Component pre-set to nominal • Fiducial and mover in-line when possible • Right balance between fine and coarse thread LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  23. Example LCLS-I BTH West LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  24. Mapping Phase • Observation scheme: • Identical to monument network • Including component fiducials • Computation phase: • Identical to monument network • Generating observed position and attitude (and their standard deviations) for each component • Move list • Option 1: to ideal • Option 2: to smooth line • The next 2 graphs show the as-built results for the 33 quadrupole magnets in the Undulator Hall in December 2008, right before the start of LCLS-I. LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  25. LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  26. LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  27. Linac Laser Alignment - Line LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  28. Linac Laser Alignment - Changes LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  29. LCLS-I Measurement Campaigns LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  30. UH Wall Deformations Both Undulator Hall and X-Ray Tunnel show slow shrinking of the tunnel walls relative to each other by <1mm/year LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  31. Floor Deformations LTU UH XRT FEH Dump NEH FEE • 3 mm initial floor deformation, correlated with earth backfill above dump area • Since July 08 deformation < 0.5 mm (~0.5 μm/day for largest deformation) LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

  32. LCLS Survey & Alignment Timeline May 2010 May 2011 Feb 2004 May 2005 Nov 2007 Dec 2007 Jan 2008 Feb 2008 Mar 2008 Apr 2008 May 2008 Jun 2008 Jul 2008 Aug 2008 Sep 2008 Oct 2008 Nov 2008 Dec 2008 Monument Template LCLS-II Stand / Plate Outside Network Component Mapping / Move LCLS-I e-beam Installation Fiducialization Girder Assembly LCLS LCLS-II Survey & Alignment Pohang Accelerator Laboratory, 05-31-2011

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