1. Fiducialisation and initial alignment of components for CLIC Mateusz Sosin on behalf of the CLIC active pre-alignment team CLIC Workshop 2015

2. Outline CLIC alignment requirements Components position determination Fiducialisation – CLIC module components Initial alignment on a common support Summary CLIC Workshop 2015 1

3. CLIC alignment requirements Components need to be pre-aligned CLIC Workshop 2015 2 o Microprecision machining of parts that make up the module components o Components and reference fiducials measurements - fiducialisation o Precise assembly of components on support girders, determination and control of its position in support coordinate system – initial alignment o Adoption of an active alignment system: o Classical mechanical pre-alignment during installation o Active alignment using sensors and actuators ComponentAlignment requirements Main Linac component14 - 17 µm Main Linac reference points10 µm Beam Delivery System10 µm These alignment requirements are achieved by

4. Components position determination How to determine components axes in the support coordinate system o Fiducialisation of each component - the position of the alignment targets (fiducials) and reference surfaces is determined at the micron level w.r.t the reference axis of the component o In case of an assembly of components - each component is pre-aligned on the support o Thanks to fiducialisation – the position of each component is determined within a few microns in the support CS CLIC Workshop 2015 3 Mechanical support Component 1 Component 2 Fiducials

5. Fiducialisation – CLIC module components CLIC Workshop 2015 4 Issue of CLIC Two Beam Test Module V-shape supports sensor interfaces fiducials

6. CLIC Workshop 2015 5 Supporting system, RF components o Designation of mean axis of the V-supports (residuals considering all V supports): - girder 3865 (MB) 12.5 µm - girder 3867 (DB) 9.3 µm o Fiducialisation of components by 3D Coordinate Measurements Machine (CMM) Leiz Infinity Uncertainty of measurement: 0.3 μm + L/1000 mm Olivetti Inspector Maxi 900v Uncertainty of measurement: ± 6 μm (3σ) Fiducialisation – CLIC module components Prismo Ultra - Zeiss Uncertainty of measurement: 1.2 um+ L/500 mm

7. Special aspect of Drive Beam Quadrupole o Measurements of the fiducials of the magnet and fiducials of the bench using laser tracker LTD500 o Good repeatibility of magnetic axis determination o Similar fiducialisation results using both methods: o Goal : determine the magnetic axis of a Drive Beam Quadrupole using vibrating stretched wire method o Accuracy of the fiducialisation should be better than 10µm CLIC Workshop 2015 6 Old and new method of fiducialisation compared Fiducialisation – CLIC module components OLD vs. NEW method radial (µm)vertical (µm) DBQ 128 DBQ 205 OLD NEW

8. Initial alignment on a common support Determination of components axes in a support coordinate system o Position of magnetic axis for each DBQ is different o Assembly interface (side quadrupole surface) can not ensure proper position of magnetic axis o 5 Degree-Of-Freedom, µm resolution adjustment needed CLIC Workshop 2015 7 Special case of DBQ alignment o Accelerating Structures, PETS installed on the V-shape supports o Control on site: combination of AT401 (laser tracker) and Romer arm measurements o Determination of components position - precision and accuracy below 10 μm

9. Initial alignment on a common support Solution for µm, 5DOF adjustment of DBQ on the girder CLIC Workshop 2015 8 o Stewart platform based solution with flexural supports o Allows DBQ position adjustment in 5DOF o Regulation resolution at the level 1..2µm o Ergonomic and intuitive – precise adjustment in 20 minutes

10. Initial alignment on a common support Measurements results – CLEX module example CLIC Workshop 2015 9 DBQ 1 DBQ 2 PETS 1 PETS 2 AS 1 X Y Z Y, Z [mm] X [mm] MB - - - vertical (Z); ̶̶ ̶̶ ̶̶ ̶̶ radial (Y) Y, Z [mm] DB - - - vertical (Z); ̶̶ ̶̶ ̶̶ ̶̶ radial (Y) X [mm]

11. Summary o CMM measurements are indispensable to provide precise and accurate components fiducialisation o CMM measurements of fiducials as a first step combined with AT401 + Romer arm measurements as a second step (when needed) - provide the best solution for micrometric alignment on site o Determination of the position of components is better than 10 µm (in stable environment) o The solution proposed for alignment of Drive Beam Quadrupole meet the expectations. 5 Degree-of-Freedom adjustment within few µm was ergonomic and intuitive CLIC Workshop 2015 10