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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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.