Metrology and pre-alignment of the components of CLIC in the PACMAN project S. W. Kamugasa, V. Vlachakis CLIC Workshop January 2015 CERN, Geneva, Switzerland

P article A ccelerator C omponent’s M etrology and A lignment to the N anometer scale Project funded Innovative Doctoral Program, hosted by Universities & Laboratories: Cranfield University ETH Zürich LAPP SYMME University of Sannio IFIC TUDELFT University of Pisa Industrial Partners: DMP Eltos Etalon A.G. Hexagon Metrolab National Instruments SigmaPhi TNO

CLIC alignment challenge  Beam size at IP ≈ 40 nm × 1 nm  Achievable with beam based alignment  Modules pre-alignment: 10 μm / 200 m sliding window

Current pre-alignment strategy 1.Fiducialization 2.Alignment of components on common support 3.Alignment of common support in tunnel LASER TRACKER 20,000 modules

Proposed strategy  Integrate fiducialization and alignment on a common support at the same place and same time Reduce build up of systematic and random errors Achieve required precision & accuracy Requires combination of several technologies

 Measure distances  Estimate:  3D coordinates + uncertainties  Least squares adjustment  Adapt FSI (Frequency Scanning Interferometry) Multilateration Y X Z

 Developed by Oxford  Absolute distance measurement  Employs second laser to counter drift  Traceability ensured by measurement to gas cell  0.5 µm/m uncertainty (95% CL)  Simultaneous measurements (up to 100 distances) Absolute Multiline Absolute Multiline by Etalon AG

 Wide viewing angle retroreflector for optimum geometry  Modify fibre end housing to enable absolute distances to be measured  Calibration strategy  Multilateration network  Wire measurement  Simulations FSI adaptation

 Based on Triangulation Determines 3D coordinates of geodetic network Measures angles (horizontal & vertical) Requires distance for scale  Micro-triangulation High accuracy industrial theodolites Short range measurements Few µm precision Micro-triangulation Hz V Zenith

 QDaedalus Developed by ETH Zurich Geodesy and Geodynamics lab Consists of hardware & software developments Replaces eye piece with CCD camera non destructively Can reach precision of 10 µm in 3D coordinates QDaedalus

 Optical Target Recognition (OTR) Centre of mass Template least squares matching Circle matching Ellipse matching  Advantages of OTR Distant, fragile, hot or cold targets can be used Relatively cheap targets No need to touch targets Useful in hazardous environments Detection algorithms

Micro-triangulation developments  Stretched wire algorithm 0.1 mm wire detection (image processing) Extraction of angle measurements 3D vector reconstruction  Other enhancements Hardware Software

Conclusion PACMAN aims: Tasks: Y X Z Thank you!