PACMAN study of FSI and µ-triangulation for the pre-alignment of CLIC

Hélène MAINAUD DURAND

Agenda

• PACMAN:

• As a ITN program

• Technical objectives

• Development of FSI for PACMAN:

• Introduction of FSI system

• Current status

• Developments foreseen

• Development of µ-triangulation for PACMAN:

• Introduction to µ-triangulation

• Current status

• Developments foreseen

Outline

a study on Particle Accelerator Components’ Metrology and Alignment to the Nanometer scale

PACMAN as a ITN

Provides EC funding for post-grads to participate in CERN project

Marie Curie action

Initial Training Network

• Improve career perspectives of Early Stage Researchers (ESR) in both public & private sectors

• Make research careers more attractive

Innovative Doctoral Program

• Management at CERN

• 10 ESR

• ESRs must be working towards a PhD

• Associated partners from industry and universities

• Secondment of at least 3 months in industry for each ESR

PACMAN as a ITN

High quality training program

3 PACMAN workshops

... Special emphasis put on women scientists

dedicated outreach activities...

• Training through research at CERN and at universities

• Through secondments in the industrial partners

• Scientific, academic and technological training courses organized by PACMAN

• Transferable skills training courses

• First workshop: 02-04 February 2015 setup the scenario

• Plus a workshop on Intellectual Property and Technology Transfer foreseen in 2016.

PACMAN Associated Partners

DMP ES

ELTOS IT

ETALON DE

METROLAB CH

SIGMAPHI FR

Hexagon Metrology DE

National Instruments HU

TNO NL

Cranfield University GB

ETH Zürich CH

LAPP FR

SYMME FR

University of Sannio IT

IFIC / FESIC ES

University of Pisa IT

Delft University NL

PACMAN : technical objectives

CLIC

Sub-micrometric beam size, down to a few nanometres at the IP

A number of challenges to mastered, among which:

• Very tight pre-alignment budget of error → 10 µm over 200 m

• Active stabilization of quadrupoles → nanometre range

PACMAN : technical objectives

Pre-alignment of components

Very important number of components

Compact

Very low error budget of pre-alignment

~ 4000 ~ 4000 ~ 140 000

14 µm 17 µm 17 µm

BPM Quadrupole RF structure

PACMAN : technical objectives

Metrology

Develop very high accuracy metrology & alignment tools and integrate them in a

prototype alignment bench

Extrapolate the tools & methods developed to other projects

Survey & alignment

Beam instrumentation

Radio Frequency

Nano-positioning

Magnetic measurements

PACMAN : scientific project

Prototype alignment bench

PACMAN : scientific project

PACMAN scientific project

Emphasis on subjects 1.2 & 1.3…

ESR Subjects Secondments Academic supervision

1.1 Non contact high precision sensor for Leitz

Infinity Coordinate Measuring Machine Hexagon

(3M + 2M) Cranfield

University

1.2 Development and validation of an Absolute Frequency Scanning Interferometry (FSI) network

Etalon (3M) ETH Zürich

1.3 Micro-triangulation for high accuracy short range measurements of dynamic objects

Etalon (3M) ETH Zürich

Development of a FSI for PACMAN

Absolute Multiline

• Absolute distance measurement

• 8 channels expandable to 100

• Uncertainty (95%) = 0.5 µm/m

• Traceable

• Measurement distance: 0.2 – 20 m

• Fibre length (20 m) extendable

FSI = Frequency Scanning Interferometry

Development of a FSI for PACMAN

• Coordinates determined via multilateration

• Good geometry

• Wide viewing angle retro reflector

• Compatible with µ-triangulation measurements

• Objective: new FSI target

Coordinate determination

Fibre end modification

• Exact position of beam splitter difficult to determine

• Modification to determine distances from known point

• Measurable by CMM & µ-triangulation

• Objective: adapt fibre end to fiducials measurable by CMM & µ-triangulation

Development of a FSI for PACMAN

• Need to make more than one measurement from a single station

• Possibility of using a divergent beam, seeing more than one reflector

• Potential issue: very low return intensity

• Utilisation of motorized device to rotate fibre end

• Objective: modification of the software to be able to determine more than one measurement station

Network development

Network analysis and simulation

• Data to be exploitable under LGC++

• Simulations to be performed under LGC++

• Objective: select best FSI network configuration

µ-triangulation for PACMAN

• Triangulation: angle measurements method used for 3D geodetic networks

• µ-triangulation:

• to short range measurements

• Precision ~ a few micrometers

• With high accuracy industrial theodolite

µ-triangulation

Configuration

• 1 total station Leica TDA 5005 (angle measurement stdev: 0.5’’ at 1σ)

• 1 CDD camera, monochromatic, 1032x778 pixels, with a pixel size of 4.65 µm x 4.65 µm

• 1 Focuser (stepper motor, two gears & rubber toothed belt)

• Illuminated targets

• Qdaedalus software

µ-triangulation for PACMAN

• Inventory of possibility of detection of a stretched wire

• Implementation of the algorithm

• Objective: new algorithm of detection

Detection of a stretched wire

Improvement of hardware

• Improvements in the components’ size & wireless connectivity

• Connect, control & measure several stations simultaneously

• Validate several types of targets (compatible with FSI, CMM and laser tracker)

• Objective: monitor dynamic objects in real time

µ-triangulation for PACMAN

Improvement of sofware

• Improve GUI

• Enhance auto-focus functionnality

• Upgrade Qdaedalus – LGC ++ communication

• Develop on-line, remote control of the system

• Objective: improve ease and speed of the measurement procedure

µ-triangulation &FSI for PACMAN

Upgrade of both technologies for PACMAN

Inter-comparison

• Between both on a dedicated mock-up → End of 2015

• With CMM measurements → mid 2016

Extrapolation towards a portable solution of measurement

Strategy

Development of a portable solution to replace CMM measurements: combination of FSI & µ-triangulation

PACMAN = golden opportunity for students, partners & CERN:

Summary

Upgrade for PACMAN

Development of common hardware &

software

Inter-comparison

Validation with CMM

measurements

Extrapolation to a portable

solution

• Exposure to leading edge technology

• Multidisciplinary & multi-cultural environment

• Work with large network of industries & universities

• High quality training & outreach activities

• Get trained manpower during the secondment

• Develop synergies with other partners

• Attract international researchers to strengthen their team

For students For partners

Thank you very much