H. MAINAUD DURAND

on behalf of the CLIC active pre-alignement team

CLIC Survey and alignment

OUTLINE

Strategy Review of specific tasks

o Development of sensorso Fiducialisation & PACMAN 02/09/2014

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CLIC (intro)

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CLIC, module & pre-alignment

CLIC & modules:o CLIC (Compact Linear Collider): study for an electron-positron collider, with a center of

mass energy of 3 TeV (Length > 40 km for 3TeV)o Based on a two beam acceleration concepto The two main linacs consist of more 20 000 modules (with a 2m length)

Pre-alignment case:o The components must be pre-aligned @ better than 14 um w.r.t a straight reference

line over a sliding window of 200mo An active pre-alignment is needed: the position of the components is determined by

sensors, and is re-adjusted by actuators in a continuous way.

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CLIC, module & pre-alignment

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Introduction

Survey and alignment:

In all the areas (damping ring, main linac, BDS, transfer lines,…)

For all the components, from 10 µm in the BDS to a few mm in the beam dumps

At all the stages of the project• Geodetic studies before excavation• Installation of geodetic networks as soon as the tunnel floor is ready• Active pre-alignment before the first pilot beam, and then every 2-3

days…

Divided into several steps:

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Strategy …

Priorities on active pre-alignmentOne solution

feasible

From the performance point of viewCompatibility with other systems &

integrationAffordable

Alternative solutions

To qualify the first solutionTo replace the first solution with less drawbacks, according to the criteria below

Criteria:- Performance- Cost- Low sensitivity to environment (humidity, pressure,

T°)- High resistance to radiation- High resistance to magnetic fields- Low sensitivity to EMC- Easy to integrate- Easy to install- Easy to maintain

Develop a catalog of methods, means according to the steps, size of components, requirements,…

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Strategy

Methods used for LEP (& St Gottard tunnel)

Transfer of knowledge in 2010 (LHC pit: PM32)

Metrological network proposed for CDR: Stretched wires + cWPS [patented] + HLS to model the catenary + biaxial inclinometersGeodetic studies concerning the geoid

Studies of alternatives:RasDif (3 point alignment system) Lambda project (n-point alignment system)

For CDR: cWPS [patented]Alternatives:

oWPS [Brandeis University, Open sourceRaschain [NIKHEF]

Development of Rad-Hard inclinometers

Study of two configurations of actuators3 DOF “snake system”5 DOF cam movers

=

sensors

actuators

+

TT1

TZ32

Two Beam Modules (TBM)

prototypes in lab

Labs

TBM prototypes

in CLEX

Test setups

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Strategy

Combination of CMM measurements and portable means

Development of portable means:AT 401, Romer ArmMicro TriangulationFSI ?

Validation by CMM measurements

Special study with MME, metrology, magnets, BI, magnetic measurements of a global solution of fiducialisation and alignment on common supports

Monitoring of QD0

QD0 w.r.t 500 last meters of BDS

Left side versus right side through survey galleries

Development of a new solution

Same solutions as for main linac &BDSIntegration needed

Laser solution to be developed. FSI?

Labs

TZ32

TBMprototypes

in lab

TBM prototypes

in CLEX

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Task 1 : development of sensors

Sensors (introduction)

Requirements:

Biaxial measurements (radial & vertical) Range : > 3 mm Resolution < 0.2 μm Repeatability: < 1μm Accuracy: < 5μm over the whole range

3 solutions under development:

cWPS = capacitive Wire Positioning Sensors oWPS = optical Wire Positioning Sensors RasDif / RasNik

Strategy in all cases:

Validation on individual setups and calibration

benches

Inter-comparison on two beam modules prototypes in lab & accelerator

environment

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Task 1 : development of sensors

Sensors : cWPS

60 sensors installed in the LHC on the low beta triplets

Rad Hard (sensors up to 300 kGy, Remote electronics up to 50 kGy)

Resolution: 0.2 µmBut relative measurements only!

Latest achievements:

An isostatic mechanical interface allowing a repositioning within 1µm and an absolute calibration has been developed

A very accurate linearity bench: accuracy < 5 µm An « absolute » bench Dedicated lab with a temperature stable within ± 1ºC

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Task 1 : development of sensors

Sensors : oWPS

Main characteristics (from the manufacturer)

Resolution: < 0.1 μm Range : +/- 5 mm (along two axes) Repeatability: 2μm Accuracy : < 5μm Wire: Vectran

Latest achievements:

A very accurate linearity bench A vectran wire (manufactured fiber spun from a liquid crystal

polymer) visible to infra-red light and not antistatic silver plasma coated wire.

Resolution < 1 µm, interchangeability < 5 µm Noise problem to be solved Impact of temperature: ~ 6µm/°C to be corrected Absolute calibration to be controlled.

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Task 1 : development of sensors and actuators

Sensors : Inclinometer

High precision biaxial inclinometer:

A Tilt Meter System (TMS) was developed by Fogale Nanotech, based on capacitive measurements for relative angle measurements in CTF2

Rad hard, resolution < 1µrad But so time-consuming to manufacture that the firm does not want to sell new ones

any more

Status:

New absolute calibration bench to be developed Absolute bench to be designed Impact of temperature to be corrected Rad hard version needed.

Latest achievements:

Althen / Sherborne high precision inclinometers ordered and installed on the TBM prototypes :o Equipped with a cWPS type interfaceo Repeatability : 2-3µrado Interchangeability < 4-5 µrad

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Task 1 : development of sensors and actuators

Sensors : Next steps

Sensor compatible with accelerator environment:

- Rad hard tests- EMC- Magnetic fields

Sensor optimization:

- Performance- Robustness- Mass production- Cost

2014-2015

Not before 2015

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Task 3 : active pre-alignment of two beam modules

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First lessons learnt on TBTM concerning alignment

• The alignment strategy on short range consists of a very accurate determination of the coordinate systems of: The components Their supports assembly The sensorscombined with a micrometric adjustment

• First lessons learnt: CMM measurements are the most precise and accurate CMM measurements of fiducials as a first step combined with AT401 + Romer

arm measurements as a second step provide the best solution for micrometric alignments on site.

• The first obtained results show that the followed strategy can be successful. The problem is that only the mechanical axis of the components was considered and not their electrical zero or magnetic axis. one solution: perform at the same time the determination of the magnetic axis and electrical zero and the CMM measurements, object of the PACMAN project.

PACMAN project:

Propose and develop an alternative solution integrating all the alignment steps and technologies at the same time and location (CMM machine)

Technologies concerned:

Beam Instrumentation

Metrology Micrometric alignment

Nano positioning

Magnetic measurements

Ultra high precision

engineering

Scientific project

Long term

• Automation of the process

• Simplification (method, duration, components)

• Extrapolation to other components

• Optimization of performances & precision in all domains

• Preparation of industrialization

Short term: some key issues

• Integration, ultra-high precision engineering and manufacturing

• Magnetic measurements with a vibrating stretched wire (and alternative based on printed circuit boards rotating search coils)

• Determination of the electromagnetic centre of BPM and RF structure using a stretched wire

• Absolute methods of measurements: new measuring head for CMM, combination of FSI and micro-triangulation measurements as an alternative

• Improve seismic sensors and study ground motion

• Nano-positioning system to position the quadrupole and BPMBuild a prototype alignment bench

DMP ES

ELTOS IT

ETALON DE

METROLAB CH

SIGMAPHI FR

University of Pisa IT

Cranfield University GB

ETH Zürich CH

LAPP FR

SYMME FR

University of Sannio IT

IFIC / FESIC ES

Delft University of Technology NL

Hexagon Metrology DE

National Instruments HU

TNO NL

EC fundings for 10 PhD students

Start date 1/09/2013

Duration: 4 years

Marie Curie Initial Training Network (ITN):

Web site:http://www.pacman.cern.ch/

Innovative Doctoral Program

CERN as host institution

15 associated partners