atlas placement and alignments

D. Lissauer – Alignment and Placements Overview – ATLAS Overview Week – October 7 ’04.1

ATLAS Placement and ATLAS Placement and AlignmentsAlignments

David Lissauer / BNL

Result of many discussions over the past year with:

Survey Team. LHC Machine and Civil Engineering. Toroid and Muon Placement. Calorimeters: LAr/Tile.Inner Detector. Beam Pipe.EC Toroid, ShieldingPhysics.

Experimental Hall is very small compare to ATLAS Size.

“Ship in a Bottle”

Need to be aligned to the beam line to ~ mm and many of large Many envelopes have less than 20mm stay clear areasbetween

moving Objects.

Every Silly mm Counts!!!


ATLAS Placement ATLAS Placement ConsiderationsConsiderations

Items under active consideration:

Floor Stability -- Monitoring on going

HO/HS Structures -- Accepted

Feet & Rail Placement -- Feet Accepted/Final Rail Aug ’05.

Barrel Toroid Placement -- Ongoing

Barrel Calorimeters/Solenoid -- Ongoing

EC Calorimeter -- Under study

ID Placement -- Preliminary agreement/Ongoing

Beam Pipe Placement -- Preliminary agreement/Ongoing

Small Wheel -- Under Study

EC Toroid -- Under Study

Big Wheels -- Under Study

EO Chambers -- Under Study

JF Shielding -- Under Study


LHC Nominal Beam and IP.LHC Nominal Beam and IP. Nominal Beam Line:Nominal Beam Line:

Close orbit calculations uncertainty in the Nominal Beam Line (Geometrical line) is 3 mm. (I.e. actual beam vs. nominal beam line)

Uncertainty might be reduced by the time Barrel Calorimeter is installed (’05)

Beam Adjustments :Beam Adjustments : “Immediate”: < 1 mm by changing the magnetic field in the last

magnet. “Short term”: ~1 mm by adjusting the Jacks under the last triplet. “Long term”: Re-align a string of magnets along the tunnel. Adjustments

could be as much as 10-20 m.m. (K. Potter et al.)

Discussions with Machine, Survey: Discussions with Machine, Survey: (K. Potter et al.)(K. Potter et al.) Machine will be able to align itself to the ATLAS experiment to the level

of 10-20 mm during a long shut down. The machine does not expect to be able to do this more than once every ~ 3 Years.


Placement StrategyPlacement Strategy Stages I: Surface assemblies.Stages I: Surface assemblies.

Placement of assemblies on the surface. Components need to be aligned and adjusted relative each other on the surface.

E.g: Barrel Cryostat Assembly: EM calorimeter, Solenoid magnet and Cryostat. ID Barrel Assembly: Included TRT , SCT and Pixel Tube.

Stage II: Cavern assemblies.Stage II: Cavern assemblies. Placement of Assemblies in the Cavern. Components need to be aligned and

adjusted relative each other (Geometrical Beam line at the same time). E.g: Barrel Cal Assembly: Tile and Barrel Cryostat Assembly are aligned relative to

each other and the nominal beam line.

Stage III: Final placement.Stage III: Final placement. Placement of assemblies relative to the nominal beam. (Usually)

E.g: Barrel Can Moves to final position and aligned relative to the Nominal Beam. Barrel Toroid. Due to the Floor movement we need to decide if we place the object at nominal

position of “Off” nominal position expecting floor movement.

TC/Survey/Systems follow each of the “assemblies”TC/Survey/Systems follow each of the “assemblies”Working groups follow Placement specifications, and survey Working groups follow Placement specifications, and survey

needs.needs.


ATLAS Exp. Hall – Floor Movement ATLAS Exp. Hall – Floor Movement

Civil Engineering expectation:Civil Engineering expectation:The existing calculation were done with simplifying assumptions.

i) Too large of a gridii) Uniform Load on the floor

Floor Settlement:Floor Settlement: -2 mm from the time the concrete if poured and -2 mm from the time the concrete if poured and the time ATLAS got possession of the the time ATLAS got possession of the experimental hall. (No measurements to verify this)experimental hall. (No measurements to verify this)

ATLAS weight:ATLAS weight: -5.5 mm (Total –7.5 mm) due to the weight -5.5 mm (Total –7.5 mm) due to the weight of the exp. Over ~ 6 month. Adiabatic as the of the exp. Over ~ 6 month. Adiabatic as the weight is added.weight is added.

» Floor upward lift due to Hydrostatic Pressure:Floor upward lift due to Hydrostatic Pressure:~ + 1 mm / year due to hydrostatic pressure.

Up To ~ 20 mm over 20 years.


GRID Monitoring Floor GRID Monitoring Floor Movement Movement

A GRID of Survey “Rivets” has been installed at strategic position.

Monitoring of the floor stability is ongoing from July/August of ’03.

Expect to re-measure position every 2-6 month.

Accuracy : 0.3 mm – ‘datum point’: deep reference in the tunnel (same for machine and experiment geometry)


Hydrostatic Monitoring Hydrostatic Monitoring

Hydrostatic System has been operating since June ’04.

(See TMB report by Hélène MAINAUD DURAND TS/SU/MTI)

Time span is small but measurements indicate movement of the floor. Higher on USA side than US side.

(For details see presentation by Jean-Christophe Gayde)

Relative height accuracy better than 100 Microns.

Absolute (relative to beam line 0.3 mm Sigma)


Hydrostatic data qualityHydrostatic data quality

Note Scale:

In Microns!!


Floor Stability – 8/03 9/04.

Precision (1 sigma) of the dZ = 0.2 mm


-20 -15 -10 -5 0 5 10 15 20

-10

-5

0

5

10

A23+5

A23-7

A17+8

A17-14

A11+5

A11-5

B0-9

B0-5

B0+5

B0+8

C12-5

C12+5

C17+8

C17-14

C23-7

C23+5

C23+10

C22-15

A23+10

A22-15 -0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0.6

From 25 June 04 to 08 Sept 04

Floor and Bedplate Stability – 3D Model

Floor Movement uneven.

Possible combination of Hydrostatics lift and sage due to weight.

Need more time dependent data.


Floor Movement – Best Floor Movement – Best EstimateEstimate

Summary of the “pessimistic” prediction for the floor movements.

SettlementDue to Cement Contraction before1st meas.

3 MMSettlementDue to ATLASWeight.

0.4 MM/yearliftDue to hydrostaticpressure

Weight %

1st 2mm Exp Load Lift after Net floor Floor Meas.

Relative Toroid- Barrel ID - ID- Fine*

(-5.5) Move 1 year Move To Barrel cal Rails 3 mm-2 -3 0.4 Nominal

Floor installation 0 0.0 0.0 0.0 1.1 9/1/2002 0Relaxation of the Walls -2 4/1/2003 7

Get Hall.** 0 0 0.0 0.2 0.2 0.0 1.3 4/10/2003 7Bed Plat Inst. 5 0 -0.2 0.5 0.3 1.4 10/20/2003 14

Feet Inst 7 0 -0.2 0.5 0.3 1.4 12/30/2003 16Toroid-start 7 0 -0.2 0.9 0.7 0.6* 1.7 1.0 11/1/2004 26

Rail Installation 27 0 -0.8 1.1 0.3 1.4 0.7 0.0 7/1/2005 34Barrel 50 0 -1.5 1.2 -0.3 0.7 0.0 -0.7 -1.0 7/15/2005 35

EC Cal ** 75 0 -2.3 1.3 -1.0 0.1 -0.7 -1.3 -1.6 10/15/2005 38ID Instlation 76 0 -2.3 1.3 -1.0 0.1 -0.6 -1.3 -1.6 -2.0 -2.0 12/1/2005 40

JD/SW 80 0 -2.4 1.5 -0.9 0.2 -0.5 -1.2 -1.5 -1.9 -1.9 6/1/2006 46BW Installation 83 0 -2.5 1.5 -1.0 0.1 -0.6 -1.3 -1.6 -2.0 -2.0 6/1/2006 46

EC Toroid** 100 0 -3.0 1.4 -1.6 -0.5 -1.3 -1.9 -2.2 -2.6 -2.6 3/1/2006 43First Beam 100 0 -3.0 1.9 -1.1 0.0 -0.7 -1.4 -1.7 -2.1 -2.1 6/1/2007 58

1 year 100 0 -3.0 2.3 -0.7 0.4 -0.3 -1.0 -1.3 -1.7 -1.7 6/1/2008 702 years 100 0 -3.0 2.7 -0.3 0.8 0.1 -0.6 -0.9 -1.3 -1.3 6/1/2009 823 years 100 0 -3.0 3.1 0.1 1.2 0.5 -0.2 -0.5 -0.9 -0.9 6/1/2010 944 years 100 0 -3.0 3.6 0.6 1.6 0.9 0.2 -0.1 -0.5 -0.5 6/1/2011 1075 years 100 0 -3.0 4.0 1.0 2.0 1.3 0.6 0.3 -0.1 -0.1 6/1/2012 1196 years 100 0 -3.0 4.4 1.4 2.4 1.7 1.0 0.7 0.3 0.3 6/1/2013 1317 years 100 0 -3.0 4.8 1.8 2.8 2.1 1.4 1.1 0.7 0.7 6/1/2014 1438 years 100 0 -3.0 5.2 2.2 3.2 2.5 1.8 1.5 1.1 1.1 6/1/2015 155

9 years*** 100 0 -3.0 5.6 2.6 3.7 2.9 2.2 1.9 1.5 1.5 6/1/2016 16710 years 100 0 -3.0 6.0 3.0 4.1 3.3 2.6 2.3 1.9 1.9 6/1/2017 18011 years 100 0 -3.0 6.4 3.4 4.5 3.7 3.1 2.7 2.4 6/1/2018 19212 yeasr 100 0 -3.0 6.8 3.8 4.9 4.1 3.5 3.1 2.8 6/1/2019 204

Instalation Time* Rail Date Time


Feet/ Rails: Installed.Feet/ Rails: Installed.

Bedplates: Have been placed in position.

Feet : Have been placed in position.

All within Envelopes.

Rail: Have been aligned and removed for Toroid installation.

Final alignment after Toroid is finished.


Toroid Placement Toroid Placement

Center of Toroid should co-inside with the Nominal Beam Line.

Position of First two Coils Fixes the center of the Toroid.

Assemble as Ellipse.

~20mm move due to Toroid weight.

~10 mm due to services and Muon chambers.


Positioning of first 2 Positioning of first 2 Coils Coils

First Coils will fix the center of the Toroid.

Physics – Center of Toroid should be on the nominal beam line.

But can be as much as 20-30 mm off without affecting Muon trigger/Physics significantly.

Envelopes- require that the Toroid be within 10 mm envelope of nominal position.

We are more sensitive to down ward fluctuation than to Upward fluctuation.


Summary & ConclusionsSummary & Conclusions

1) Toroid Assembly: Oval Circle 0. +/- 3.5 mm

2) Five Years of Floor movements 3. +/- 3.0 mm

3) Floor Sag due to weight -3. +/- 2.0 mm

4) Placement Accuracy 0. +/- 2.0 mm

Total: 0. +/- 10.5 mm

Proposal:

place the Toroid Center at

– 5mm from Nominal Beam Line.

Final Decision Week of October 18th after latest input from Survey.


Barrel Barrel Calorimeter/SolenoidCalorimeter/Solenoid

EM Calorimeter/CryostatEM Calorimeter/Cryostat::• The EM Cal was placed so that it is below the

Cryostat IWV by ~ 4 mm.

Solenoid /CryostatSolenoid /Cryostat::

• The Solenoid was placed so that it is below the Cryostat IWV by ~ 2 mm.

Relative Placement:Relative Placement:• of the EM calorimeter, Solenoid and the Cryostat IWV

are now fixed and can not be changed.



Tile Calorimeter and Cryostat assembly is being done at Z=13. Tile Calorimeter and Cryostat assembly is being done at Z=13.

After LAr if placed on the Tile on the Truck the relative position After LAr if placed on the Tile on the Truck the relative position of the Tile/Cryostat IWV/Solenoid and EM position are fixed.of the Tile/Cryostat IWV/Solenoid and EM position are fixed.

The Tile Calorimeter/Cryostat assembly will than be moved to The Tile Calorimeter/Cryostat assembly will than be moved to Z=0.Z=0.

The Barrel Calorimeter can be adjusted as a unit to the The Barrel Calorimeter can be adjusted as a unit to the Nominal Beam line. Nominal Beam line.



Nominal Beam Axis

0

2

-2

-4

Tile Calorimeter Axis

IWV Axis

Solenoid Axis

EM CalorimeterAxis

We will align the Solenoid Axis with relation to the nominal Beam Axis. Resulting in the above relative loactions.


ID - InstallationID - InstallationTRT/SCT: TRT/SCT:

Are assembled on the Surface as a unit. The TRT and SCT Axis have to be co-linear. There is a small gap between the

TRT and SCT but it can not be reduced as it is part of the thermal shield and the construction tolerance.

Pixel Tube Installation:Pixel Tube Installation: Pixel Tube is installed first in the SCT/TRT module. On the Surface. Pixel Tube can be installed “off” center by as much as 2-3 mm.

SCT /TRT Axis is Collinear. No Possibility for adjustments of SCT relative to TRT.

Pixel Tube can be inserted off axis by as much as 2-3 mm.Once inserted they can not be adjusted.


ID - InstallationID - InstallationSCT/TRT/Pixel Tube: SCT/TRT/Pixel Tube:

The SCT/TRT/Pixel Tube are installed as a unit. No relative adjustments of the individual components in possible in Situ. The Module is support are adjusted on the surface so that the SCT/TRT

axis will co inside with Barrel Cal IWV Axis. At this stage there is some adjustment in Situ possible – (Max +/- 4 mm)

but, ID aim will be to bring the Barrel IWV- TRT/SCT axis to co inside. This requirement that the TRT/SCT axis coincide comes from the very

tight space and the needed symmetry for the TRT/SCT Services.

The ID requires that the TRT/SCT axis co inside with the IWV axis dues to the ID Services needs.

ATLAS thus agrees that the TRT/SCT Axis will be placed2 mm off the nominal Beam Axis and off the Solenoid Axis.


ID - InstallationID - InstallationPixel Insertion: Pixel Insertion:

The Pixel axis will co inside with the Pixel Tube Axis. The Pixel Tube when placed (above ground) can be places so that its axis and

the TRT/SCT Axis are off by 2-3 mm.

There are thus two options for the Pixel installation.i. Place Tube Axis with SCT/TRT.

ii. Place Tube Axis off by 2 mm to co-inside with Nominal beam.

The Present baseline is to install the Pixel to Co-inside with the Nominal Beam Line


Summary of the Summary of the Placement Placement

Nominal Beam Axis

0

2

-2

-4

Tile Calorimeter Axis

IWV Axis

Solenoid Axis

EM CalorimeterAxis

Pixel Tube - PixelBeam Pipe

TRTSCT

Toroid Axis


Barrel Muon SystemBarrel Muon System

The Muon Support structure:The Muon Support structure: Rail System. First adjustments above ground (Local Coordinate system) Final Adjustments in Situ before chambers are mounted. Each Tower points to the Intersection region.

Individual Alignment/Placements for each chamber Individual Alignment/Placements for each chamber assembly needs are being defined.assembly needs are being defined.

MDT’s & RPC’s subassembly done on the Surface. Once placed on the Rails no adjustments is possible.

Chamber Assembly Placement.Chamber Assembly Placement. The specification on chamber placement needs to be defined. Survey

Target position etc.

Alignment System. Alignment System.


Barrel Muon SystemBarrel Muon System

Local reference frame of the large sector

Local reference frame of the small sector

Reference points on the Toroid structure

Chamber rails

Reference plates for the alignment system

y

x

y

x


Conclusions:Conclusions:

Floor Monitoring systems are in place.Floor Monitoring systems are in place. ATLAS Placement has started. ATLAS has installed :Feet ATLAS Placement has started. ATLAS has installed :Feet

Rails, HS and HO structures. Rails, HS and HO structures. (Rails can still be readjusted )(Rails can still be readjusted )

This already has resulted in small change to detector This already has resulted in small change to detector envelopes and final placements. envelopes and final placements. (e.g. HO chambers moved by (e.g. HO chambers moved by 20 mm in Z.)20 mm in Z.)

Some Subassemblies on the Surface already completer: Some Subassemblies on the Surface already completer: Barrel EM/Solenoid/IWV completed, EC-C.Barrel EM/Solenoid/IWV completed, EC-C.

Agreement on Procedure and hierarchy for Barrel Agreement on Procedure and hierarchy for Barrel Calorimeter/Solenoid/ID placement.Calorimeter/Solenoid/ID placement.

Toroid Placement will start later this month. Toroid Placement will start later this month.

Need to follow and re-optimize placement of Need to follow and re-optimize placement of detectors continuously.detectors continuously.

atlas placement and alignments

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