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

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

CLIC alignment requirements Components need to be pre-aligned CLIC Workshop 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 component µm Main Linac reference points10 µm Beam Delivery System10 µm These alignment requirements are achieved by

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 Mechanical support Component 1 Component 2 Fiducials

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

CLIC Workshop 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

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 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

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 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

Initial alignment on a common support Solution for µm, 5DOF adjustment of DBQ on the girder CLIC Workshop 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

Initial alignment on a common support Measurements results – CLEX module example CLIC Workshop 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]

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