géraldine conti

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Géraldine Conti May 21, 2007 Monday Seminar

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Detector Boxes Detector Boxes FiducialisationFiducialisation

IT Frame SurveyIT Frame Survey

IT Frame Survey Coordinate System (1)IT Frame Survey Coordinate System (1) The origin of the Survey coordinate The origin of the Survey coordinate

system is at the Interaction Point (IP)system is at the Interaction Point (IP) Correction of the nominal z values : z’ Correction of the nominal z values : z’

= z= znominalnominal - tan(0.003601)·x - tan(0.003601)·x 6 half-frames to be surveyed ITA/C6 half-frames to be surveyed ITA/C

X (SU) horizontal

Z (SU) vertical

Y (SU) horizontalTowards pit 7

Towards LHC centre

Towards pit 1

LHC Nominal Beam Line

3.601 mrad

IP

(ATLAS)

horizontal

x

yz

Survey coordinate system

LHCb coordinate system

IT1A

IT3CIT2C

IT1C

IT3AIT2A

~6m

~3.7m

IT Frames

2Géraldine Conti May 21, 2007 Monday Seminar

IT Frame preliminary results (2)IT Frame preliminary results (2) First IT « Geometrical Controls » (Local coordinate system) and First IT « Geometrical Controls » (Local coordinate system) and

Adjustments (Survey coordinate system) realized from the Adjustments (Survey coordinate system) realized from the magnet area by a triangulation method (theodolite):magnet area by a triangulation method (theodolite):

IT1CIT1C (Oct.18(Oct.18thth 06, https://edms.cern.ch/document/790118 Geometrical Control ) 06, https://edms.cern.ch/document/790118 Geometrical Control ) IT2CIT2C (Nov. 9 (Nov. 9thth 06, https://edms.cern.ch/document/794872 Geometrical Control ) 06, https://edms.cern.ch/document/794872 Geometrical Control ) IT3AIT3A (Jan.26 (Jan.26thth 07, 07, https:https://edms//edms..cerncern.ch/document/816280.ch/document/816280 Before Adjustment ) Before Adjustment ) (Feb. 1(Feb. 1st st 07, https://edms.cern.ch/document/817512 After Adjustment )07, https://edms.cern.ch/document/817512 After Adjustment ) IT3CIT3C (Dec. 5 (Dec. 5thth 06, https://edms.cern.ch/document/806184 Geometrical Control ) 06, https://edms.cern.ch/document/806184 Geometrical Control )

(Feb. 2(Feb. 2ndnd 07, https://edms.cern.ch/document/818463 Before Adjustment ) 07, https://edms.cern.ch/document/818463 Before Adjustment )

Due to Beam Pipe UX85 2 & 3 (and protections) installation, no Due to Beam Pipe UX85 2 & 3 (and protections) installation, no access to magnet area possible any more : New strategy for IT access to magnet area possible any more : New strategy for IT Survey (2 steps)Survey (2 steps)

l Frame survey measurements in Opened positionFrame survey measurements in Opened positionl Frame survey measurements in Closed positionFrame survey measurements in Closed position

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https://edms.cern.ch/document/816280





Survey in opened position : Survey in opened position : Photogrammetry (3)Photogrammetry (3)

Theodolite Theodolite measurements of measurements of fiducial fiducial marksmarks give the global scale in almost give the global scale in almost closed position.closed position.

Take Take ~~150 photographs of the frame in 150 photographs of the frame in opened position, which contains opened position, which contains permanent permanent coded photo targetscoded photo targets ((20)20) recognized by the system.recognized by the system.

Photogrammetric targetsPhotogrammetric targets are used as a are used as a reference for the IT detector boxes reference for the IT detector boxes positions.positions.

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Complete E frame geometry on precision railsComplete E frame geometry on precision rails obtained by obtained by the transformation of the coordinates in opened position to the the transformation of the coordinates in opened position to the coordinates in almost closed position (with a best fit 3D ). coordinates in almost closed position (with a best fit 3D ).

Survey in opened position (4)Survey in opened position (4)View from IP : 476

477

479

474 475

481

480

478

487

489

491 493

488

490

486

482 483

485484Coded targets

492

35mm

thickness=0.12mm

35mm

35mm

thickness=0.12mm

35mm

Fiducial marks

F7

F1F2

F4

F3

F6

F5

CT CB

CTL CTRCBL CBR

CBR

CTR

150mm

486

Photogrammetric targets

TT_L TT_R TB_RTB_L

TB_L TB_Rx

zy

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IT Frame Survey : Results (5)IT Frame Survey : Results (5)

IT1AIT1A DDxx (mm) (mm) DDzz (mm) (mm)

F1F1 2.82.8 3.63.6

F2F2 0.40.4 1.21.2

F3F3 1.31.3 -4.6-4.6

F4F4 0.90.9 1.21.2

F5F5 1.71.7 1.21.2

F6F6 3.83.8 5.55.5

F7F7 4.24.2 4.54.5

CTCT 4.84.8 3.93.9

CT_LCT_L 4.54.5 3.43.4

CT_RCT_R 4.34.3 4.54.5

CBCB 4.04.0 188.3188.3

CB_LCB_L 3.93.9 7.17.1

CB_RCB_R 5.25.2 7.37.3

https://edms.cern.ch/document/834051 IT1A (March 30IT1A (March 30thth 07) 07)

IT2A (April 19IT2A (April 19thth 07) 07)


IT2AIT2A DDx x (mm)(mm) DDzz (mm) (mm)

F1F1 1.51.5 -3.4-3.4

F2F2 2.12.1 -1.1-1.1

F3F3 1.31.3 -0.7-0.7

F4F4 0.80.8 -1.0-1.0

F5F5 0.80.8 -1.0-1.0

F6F6 2.82.8 4.04.0

F7F7 2.12.1 3.83.8

CTCT -0.6-0.6 0.90.9

CT_LCT_L 2.72.7 1.01.0

CT_RCT_R 0.30.3 1.91.9

CBCB -1.6-1.6 0.60.6

CB_LCB_L 1.61.6 0.80.8

CB_RCB_R -0.9-0.9 1.61.6

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The most important The most important CT_L/R and CB_L/R targetsCT_L/R and CB_L/R targets positions are adjusted thanks to crenels on the brackets. positions are adjusted thanks to crenels on the brackets.

Survey in closed position (6)Survey in closed position (6) Theodolite method for the targets on the IT Theodolite method for the targets on the IT

detector boxes and some accessible targets detector boxes and some accessible targets on the E frames. on the E frames. Final measured positions of the IT detector boxes. Final measured positions of the IT detector boxes.

Possible to make the measurements from Possible to make the measurements from the outside of the magnet in the RICH1 the outside of the magnet in the RICH1 region. region.

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IT box FiducialisationIT box Fiducialisation 12 IT detector boxes to be fiducialised.12 IT detector boxes to be fiducialised. IT detector box fiducialisation test IT detector box fiducialisation test

performed on Oct. 25performed on Oct. 25thth-26-26thth 06. 06.

Precision obtained during the test at Precision obtained during the test at 11 level is 0.05mm and 0.1mrad on the level is 0.05mm and 0.1mrad on the angles.angles.

Needs for fiducialisation : Needs for fiducialisation : Rotating support for the box Rotating support for the box Movable neon lights to ease the Movable neon lights to ease the

measurements of the detector crossesmeasurements of the detector crosses Table stability (improved with long diagonal Table stability (improved with long diagonal

bars)bars)


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IT Boxes Offsets in ConDBIT Boxes Offsets in ConDB

Nominal positions

Measured positions Offset : dPos=(dx,dy,dz)

dz

dx

dy

x (horizontal)

z (along beam)

y (vertical)

Rotation : dRot=(,,)

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Additional targets

IT sensors Offsets in ConDBIT sensors Offsets in ConDB

Nominal positions

135

142

126

127

131

130

134

Measured positions

134

Offset : dPos=(dx,dy,dz)

z

y

x

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Rotation : dRot=(,,)

Survey TimescaleSurvey Timescale Frame Survey in Opened Position : Frame Survey in Opened Position :

IT3A and ITCIT3A and ITC :: • IT3A survey is forseen on Thursday 24IT3A survey is forseen on Thursday 24 thth of May. of May. • The ITC photogrammetric measurements should be finished up The ITC photogrammetric measurements should be finished up

to mid-July.to mid-July. Frame Survey in Closed Position :Frame Survey in Closed Position :

All IT frames :All IT frames : • Depends on when the IT detector boxes will be finished and Depends on when the IT detector boxes will be finished and

when the beam pipe protection will be removed.when the beam pipe protection will be removed. IT Detector Box Fiducialisation : IT Detector Box Fiducialisation :

All IT boxes : All IT boxes : • The Fiducialisation of the first IT detector box is forseen The Fiducialisation of the first IT detector box is forseen

tomorrow in the clean room at CERN! tomorrow in the clean room at CERN!

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