1. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 1 Intra Girder Assembly and Alignment Robert Ruland Alignment Philosophy Assembly and Alignment Alignment Philosophy Assembly and Alignment

2. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 2 Alignment Tolerances Two primary alignment tolerances: All quadrupoles need to be aligned to within ± 2 µm to a common reference line. All undulator segments need to be aligned to this reference line within 80 µm vertical and 140 µm horizontal. BPM and vacuum chamber need to be aligned to the reference line within the following tolerances: BPM horizontal200 microns BPM vertical200 microns Vacuum Chamber horizontal200 microns Vacuum Chamber vertical200 microns Quadrupole alignment tolerance will be achieved using Beam-based-alignment (BBA). For BBA to converge the quadrupoles need to be aligned using conventional alignment methods to 100 µm uncorrelated and 200 µm correlated

3. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 3 Undulator – to – Quad Alignment Tolerance Budget Individual contributions are added in quadrature

4. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 4 Alignment and Support Philosophy Global alignment of undulator segments over entire length to 80 (60) µm is very tough, instead will use BBAligned quads as local alignment references for undulator segments 60 µm tolerance is “reduced” from global (~130 m length) to relative (girder), i.e. one undulator segment to its adjacent quadrupole To avoid having to perform the critical relative alignment under tunnel conditions, all components are mounted onto a common girder. The common platform retains the relative alignment when moving the quadrupole in the BBA process Alignment Sequence Fiducialization of Components Intra Girder Alignment Conventional Installation Alignment Beam-based-alignment (Quadrupole and “loose end”)

5. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 5 Girder Alignment Concept All components will be available as complete sub-assemblies Girder Motion systems Manually adjustable supports Beam steering / detecting components: undulator segment, quad, BPM, BFW Vacuum components: undulator vacuum chamber, misc. components All components will have been fiducialized Undulator segments, quadrupoles and BFW will have fiducials in each of the principle planes RF-BPM is referenced by precision surfaces Girder Coordinate System Undulator segment in nominal position determines the girder axis All 33 undulator segments will have “identical” axis offsets; variation in location of magnetic centerline wrt mounting feet is taken out by individual shims during fiducialization All other components are aligned to this axis

6. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 6 Girder Assembly & Alignment Carried out in two steps Assembly in girder factory (Bldg 650?) No temperature control Mechanical installation of components Rough alignment sufficient for vacuum connections Vacuum connections Plumbing & Wiring Alignment in MMF (± 1º K temp. control) Pre-alignment (Optical Tooling, Faro Arm) Final alignment (CMM: Zeiss or Faro)

7. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 7 Girder Assembly & Alignment Sequence (1) Girder Assembly in Bldg 650 Station 1 Prepare Girder Mount cam wedges underneath girder Station 2 Component Installation roll-away slides component supports HLS & WPM components undulator vacuum chamber rough-align vacuum chamber Station 3 Vacuum install, pre-align and connect quad with inserted chamber same for BFW and BPM same for misc. vacuum components Station 4 Wiring / Plumbing

8. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 8 Girder Assembly & Alignment Sequence (2) Girder Alignment in MMF (temperature controlled) Station 1 Optical Alignment & Faro Arm align vacuum chamber install undulator check undulator to vacuum chamber clearance align undulator to X 0 pre-align girder components wrt undulator remove undulator Station 2 CMM (Faro Arm or Zeiss) install undulator align all components wrt undulator align undulator to X i remove undulator If test measurements prove that the combination of optical alignment and Faro arm can provide the required final alignment accuracy, all girder alignment will be performed at Station 1. The Zeiss CMM is already fully loaded by fiducialization measurements.

9. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 9 In Situ Intra-girder Alignment Verification We will be able to verify the relative component alignment in situ Horizontal component alignment tolerance (125 µm) can be achieved with standard methods: e.g. optical tooling, ecartometer (CERN developed wire offset meter) Vertical component alignment tolerance (60 µm) is marginally within optical leveling range. To be safe, we are planning to build a portable HLS based on the existing ultrasound sensors

10. Robert Ruland Intra Girder Assembly and Alignment - October 20, 2005 ruland@slac.stanford.edu Internal LCLS Undulator Alignment and Motion Review 10 END of Presentation