Metrology and pre-alignment of the components of CLIC in the PACMAN project S. W. Kamugasa, V....
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Transcript of Metrology and pre-alignment of the components of CLIC in the PACMAN project S. W. Kamugasa, V....
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Metrology and pre-alignment of the components of CLIC in the PACMAN project
S. W. Kamugasa, V. Vlachakis
CLIC Workshop26-30 January 2015
CERN, Geneva, Switzerland
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Particle Accelerator Component’s Metrology and Alignment to the Nanometer 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
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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
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Current pre-alignment strategy1. Fiducialization
2. Alignment of components on common support
3. Alignment of common support in tunnel
LASE
R TR
ACKE
R
LASE
R TR
ACKE
R
20,000 modules
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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
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Measure distances Estimate:
3D coordinates + uncertainties Least squares adjustment
Adapt FSI (Frequency Scanning Interferometry)
Multilateration
𝑙 𝑖𝑗
𝑣 𝑖𝑗
𝐹 𝑖
𝑅 𝑗
Y
X
Z
Target 3D position ()
Emitter 3D position ()
distance observation
residual
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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
Abso
lute
Mul
tilin
e by
Eta
lon
AG
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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
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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
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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
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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
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Micro-triangulation developments
Stretched wire algorithm
• 0.1 mm wire detection (image processing)
• Extraction of angle measurements
• 3D vector reconstruction
Other enhancements
• Hardware
• Software
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Conclusion
PACMAN aims:
Tasks:
Y
X
Z
Thank you!