clic survey and alignment
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CLIC Survey and alignment. OUTLINE Strategy Review of specific tasks Development of sensors Fiducialisation & PACMAN. 02/09/2014. CLIC (intro). CLIC, module & pre-alignment. CLIC & modules: - PowerPoint PPT PresentationTRANSCRIPT
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
3
CLIC (intro)
4
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.
5
CLIC, module & pre-alignment
6
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
11
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