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1/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
EDMS Document No 1157095
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
2/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/
Introduction
Simulation on Main Beam GirderSupporting systemAccelerating structuresAT401 stationsResults
Simulation on Drive Beam GirderSupporting systemComponentsAT401 stationsResults
Conclusions
Contents
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
3/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/
• Subject of the presentation To present the simulation calculations of measurements which will be performed by laser tracker AT401 for Type 0 module.
• Principle of simulations Input: realistic approximate coordinates of points and a priori accuracies of the laser tracker Leica AT401. Calculations: simulations based on the Monte-Carlo method. Output: rms accuracies for each point along the X, Y and Z axes.
• Objectives To estimate the accuracies that will be obtained during real measurements on the CLIC mock-up. To determine the number of stations to implement and their locations.
Introduction
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
4/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Main Beam GirderSupporting system
• Supporting system = 1 girder + 2 stations. • 7 fiducials on girders and 4 on sensor plates.
• Coordinate system:Z = vertical, Y = theoretical beam axis.
• Study of the girder Micro-Contrôle 1 available for the girder 2.
Beam
Beam
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
5/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Main Beam Girder Accelerating structures
• 2 alignment disks for each of the 8 accelerating structures.• 4 fiducials per alignment disk (only 2 visible from outside).• Fiducial = conical bore to receive 0.5’’ probe (CMM or measuring arm) or reflector CCR 0.5’’ (Corner Cube Reflector).
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
6/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Main Beam Girder AT401 stations
• Graphical determination of the number of stations and their locations (Autocad 2010).• Distance station/AS fiducial > 1.5 m• 5 stations are required to measure all the AS fiducials at least 2 times.
• Height of the station was set to Z = 0 to allow the targeting of points below and above the waveguides
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
7/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Main Beam Girder Results
• Simulation calculations using LGC++ v1.09.03 (SU software).
• A priori data comes from the measurements of a test bench performed before the laser tracker AT401 was ordered and after its reception :
A priori accuracy of the horizontal and vertical angles is 1.3 cc, A priori accuracy of the distances is 5 µm.
• The girder point MC1-2 is declared as fixed, the point MC1-11 is used for the orientation and all other points are free.
Sx (µm) Sy (µm) Sz (µm) 3D (µm)Maximum value 4.6 3.5 3.3 6.5
Average 3.9 3.1 3.0 5.9
• “3D” = quadratic sum of the 3 accuracies this sum is pessimistically considered as the 3D rms accuracy.
• The worst 3D accuracy (only on the AS fiducials) = 6.5 µm.
• If we consider that the longitudinal axis is not critical, worst accuracy < 6 µm.
• Supporting system = 1 girder + 2 cradles.
• 10 fiducials on girders and 8 on cradles.
• Coordinate system: Z = vertical, Y = theoretical beam axis.
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
8/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Drive Beam GirderSupporting system
• Study of the girder Boostec 3069 available for the girder 3079.
Beam
Beam
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
9/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Drive Beam Girder Components
• 2 PETS subassemblies: 1PETS and 2PETS. Each of them equipped with 12 CCR 0.5’’ holders (only 6 visible from outside).
• 6 CCR 1.5’’ holders for each of the 2 DBQ (4 visible from each side).
Beam
• Each of the 2 BPM equipped with 3 CCR 0.5’’ holders.
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
10/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Drive Beam Girder AT401 stations
• Graphical determination of the number of stations and their locations.• Distance station/fiducial > 1.5 m• 4 stations are required to measure all the fiducials at least 2 times.
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
11/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Simulation on Drive Beam Girder Results
• Same software and same a priori data as seen for Main Beam.
• The girder point B3069-1 declared as fixed, the point B3069-10 is used for the orientation and all other points are free.
• The worst 3D accuracy (only on the components fiducials) < 7.5 µm.
• If we consider that the longitudinal axis is not critical, worst accuracy < 6.5 µm.
Sx (µm) Sy (µm) Sz (µm) 3D (µm)Maximum value 5.0 3.7 4.1 7.4
Average 4.2 3.6 4.0 6.8
Simulations of laser tracker AT401 measurements on TM0 CLIC girders
12/12Sylvain GRIFFET, 17/10/2011
BE/ABP-SU/ Conclusions
• The AT401 measurements will be performed, among others, during the following steps:
Validation of a pre-alignment obtained using sensors, Determination of the components’ locations before and after transport test, Monitoring of the components and the girders during the thermal tests.
• The results obtained by the two simulations presented here are promising : For both kinds of girder, we can expect rms accuracies on the components less than 6.5 µm.
• The work done before calculating allowed us to determine the configuration of the networks and the number of necessary stations.
• Finally it is necessary to remember that these accuracies are achievable only if the measurement conditions are extremely good: no vibration, no air flow, stable temperature, etc.