ATLAS Detector – status and plans

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APS meeting April 14h, 2007.1

ATLAS Detector – status and plans

David LissauerBrookhaven National Lab.

ATLAS Technical Coordination

APS meeting

April 14th , 2007

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ALICE : heavy ions

ATLAS and CMS :pp, general purposeATLAS and CMS :pp, general purpose

Physics Runs expected to start in 2008

LHC Complex • s = 14 TeV (7 times higher than Tevatron/FNAL)

• Ldesign = 1034 cm-2 s-1

(>102 higher than Tevatron/FNAL)

LHCb : pp, B-physics

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25

ns

Event rate in ATLAS :

N = L x (pp) 109 interactions/s

25 n-sec Beam Crossing 40 MHz

~ 25 Pile up events / CrossingInteresting events are rare (high-pT )

The Experimental Challenge

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Cross Sections and Production Rates

• Inelastic proton-proton reactions: 109 / s • bb pairs 5 106 / s • tt pairs 8 / s

• W e 150 / s• Z e e 15 / s

• Higgs (150 GeV) 0.2 / s• Gluino, Squarks (1 TeV) 0.03 / s

Rates for L = 1034 cm-2 s-1: (LHC)

LHC is a factory for: top-quarks, b-quarks, W, Z

The Challenge:

Select the right events

Measure event properties

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ATLAS Physics Goals

Search for:Standard Model Higgs boson over ~ 115 < mH < 1000 GeV

Physics beyond the SM up to the TeV-rangeSupersymmetry, q/ compositeness, leptoquarks, W’/Z’, Extra-dimensions ….

Precise measurements : W mass top mass, couplings and decay properties Higgs mass, spin, couplings (if Higgs found) B-physics: CP violation, rare decays, B0 oscillations QCD jet cross-section and s

….

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LHC schedule

Official schedule: Beam Pipe closed September ’07

Beam Injection October ’07

1st collisions December ’07 (450x450)

1st collisions (Physics) ~June ’08 (14 TEV)

CERN DG is committed to the schedule.

Magnets commissioning is a challenge.

Effect of Triplet catastrophic failure test still unknown.

An official update to the schedule is expected in May/June.

(450 GeV run will probably be delayed or merged with start up – NOT official)

June ’08: 7 x 7 TeV Start up (43 Bunches )

~August ’08: 7 x 7 TeV (75 n-sec)

~October ’08: 7 x 7 TeV (25 n-sec)

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Staged commissioning plan for protonsStaged commissioning plan for protons

25ns ops IInstall Phase II and MKB

25ns ops II

75ns ops

43 bunch operation

Beam commissioning

Machine checkout

Hardware commissioning

Stage I II III

No beam Beam

IV

I.I. Pilot physics runPilot physics runnn First collisionsFirst collisionsnn 43 bunches, no crossing angle, no squeeze, moderate intensities43 bunches, no crossing angle, no squeeze, moderate intensitiesnn Push performance (156 bunches, partial squeeze in 1 and 5, push Push performance (156 bunches, partial squeeze in 1 and 5, push intensity)intensity)nn Performance limit 10Performance limit 103232 cmcm--22 ss--11 (event pileup)(event pileup)

II.II. 75ns operation75ns operationnn Establish multiEstablish multi--bunch operation, moderate intensitiesbunch operation, moderate intensitiesnn Relaxed machine parameters (squeeze and crossing angle)Relaxed machine parameters (squeeze and crossing angle)nn Push squeeze and crossing angle Push squeeze and crossing angle nn Performance limit 10Performance limit 103333 cmcm--22 ss--11 (event pileup)(event pileup)

III.III. 25ns operation I25ns operation Inn Nominal crossing angleNominal crossing anglenn Push squeezePush squeezenn Increase intensity to 50% nominalIncrease intensity to 50% nominalnn Performance limit 2 10Performance limit 2 103333 cmcm--22 ss--11

IV.IV. 25ns operation II25ns operation IInn Push towards nominal performancePush towards nominal performance

End of ’08/’09 1033

~June ’08 1030

Fall ’08 1032

Gradual Luminosity ramp up

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The ATLAS Collaboration

International ATLAS 35 Countries

164 Institutions 1800 Scientific Authors

US ATLAS:40 Institutions

> 400 Scientific Authors

Albany, Alberta, NIKHEF Amsterdam, Ankara, LAPP Annecy, Argonne NL, Arizona, UT Arlington, Athens, NTU Athens, Baku, IFAE Barcelona, Belgrade, Bergen, Berkeley LBL and UC, HU Berlin, Bern, Birmingham, Bologna, Bonn, Boston, Brandeis,

Bratislava/SAS Kosice, Brookhaven NL, Buenos Aires, Bucharest, Cambridge, Carleton, Casablanca/Rabat, CERN, Chinese Cluster, Chicago, Clermont-Ferrand, Columbia, NBI Copenhagen, Cosenza, AGH UST Cracow, IFJ PAN Cracow, DESY, Dortmund,

TU Dresden, JINR Dubna, Duke, Frascati, Freiburg, Geneva, Genoa, Giessen, Glasgow, LPSC Grenoble, Technion Haifa, Hampton, Harvard, Heidelberg, Hiroshima, Hiroshima IT, Indiana, Innsbruck, Iowa SU, Irvine UC, Istanbul Bogazici, KEK, Kobe, Kyoto,

Kyoto UE, Lancaster, UN La Plata, Lecce, Lisbon LIP, Liverpool, Ljubljana, QMW London, RHBNC London, UC London, Lund, UA Madrid, Mainz, Manchester, Mannheim, CPPM Marseille, Massachusetts, MIT, Melbourne, Michigan, Michigan SU, Milano,

Minsk NAS, Minsk NCPHEP, Montreal, McGill Montreal, FIAN Moscow, ITEP Moscow, MEPhI Moscow, MSU Moscow, Munich LMU, MPI Munich, Nagasaki IAS, Nagoya, Naples, New Mexico, New York, Nijmegen, BINP Novosibirsk, Ohio SU, Okayama, Oklahoma, Oklahoma SU,

Oregon, LAL Orsay, Osaka, Oslo, Oxford, Paris VI and VII, Pavia, Pennsylvania, Pisa, Pittsburgh, CAS Prague, CU Prague, TU Prague, IHEP Protvino, Regina, Ritsumeikan, UFRJ Rio de Janeiro, Rome I, Rome II, Rome III,

Rutherford Appleton Laboratory, DAPNIA Saclay, Santa Cruz UC, Sheffield, Shinshu, Siegen, Simon Fraser Burnaby, SLAC, Southern Methodist Dallas, NPI Petersburg, Stockholm, KTH Stockholm, Stony Brook, Sydney, AS Taipei, Tbilisi, Tel Aviv, Thessaloniki, Tokyo

ICEPP, Tokyo MU, Toronto, TRIUMF, Tsukuba, Tufts, Udine, Uppsala, Urbana UI, Valencia, UBC Vancouver, Victoria, Washington, Weizmann Rehovot, FH Wiener Neustadt, Wisconsin, Wuppertal, Yale, Yerevan

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The ATLAS Detector

~50m

~25 m

~26 m

Overall Weight 7000 Tons - “light”

“Ship in a bottle”

Muon System Toroid System

Calorimeter System

Tracking System

~100 m Underground.

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Magnet System

End-Cap Toroid:8 coils in a common cryostat

Barrel Toroid:8 separate coils

•Central Solenoid Solenoid Field in Inner Tracking Volume

•Air Core Toroid System

•Barrel Toroid

•EC Toroids Toroid Field for Muon system.

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Central Solenoid - Installation

2T field with a stored energy of 38 MJ

Solenoid Integrated with the barrel LAr Vacuum vessel.

Integrated with the vacuum vessel February 2004.

Tested at full current (8 kA) July 2004 (On Surface)

Installed in the Pit end of ’05.

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July – August 2006:

Fully commissioned in-situ up to 8.0 kA

The operation current is 7.73 kA for a field of 2.0 T

1st August 2006: the solenoid is fully operational

Field mapping machine in the Cryostat bore

Central Solenoid Commissioning

250,000 points measured

Agreement with calculation better than 10 Gauss

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Barrel Toroid

Last coil

Installed.

Jacks released

Sept. 29 2005

Mechanical Assembly completed end of ’05.

Assembly completed well within tolerance !!!

25 m

5 m

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Barrel Toroid Construction

Due to its size the Barrel Toroid had to come down in parts. Each Coil (25x5x1 m) had to be manipulated in to place.

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Commissioning of Barrel Toroid

Complicated field due to:

coils aspect ratio

Fe in the Tile Calorimeter and

HS structure around the magnet.

Cool down & Tests in Situ

July/Sept ’06 ~2.5 month

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Color scale max = 300 GColor scale max = 300 G

Magnetic Field Mapping

Barrel Field measured

Diff. of up to 50 Gauss in

outer chambers due to Fe distribution uncertainty

Perturbation to the filed due to the Fe in the HS structure.

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EC Toroid Moving to Cool down station

EC Toroid moved to Cooling Station.

Cooled down to LN2

temperature on Surface.

Ready for Installation in a few weeks.

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2nd End Cap Toroid integration

Cold Mass Insertion in the Cryostat.

Cool down to start in May.

Cryostat

Cold Mass

Cover

Turret assembly in preparation

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Magnets Summary

• Central Solenoid - Commissioned

• Barrel Toroid - Commissioned

ECT-A: Cool Down to LN2 completed on Surface

Ready for installation End of April ‘07

Installation June ‘07

ECT-C: Integration in B191 well advanced

Cool down May/June ’07

Installation July ‘07

Full Toroid (Barrel +EC) test expected end of ‘07

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• Barrel Muon System (3 Layers)

• Forward Muon System•Small wheel Assembly•Big Wheels Assembly•EO Chambers

Muon System

II < 2.7

Air-Core Toroid system

High resolution:

Monitored Drift tube

CSC (Very Forward)

Trigger Chambers:

RPC and TGC

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Barrel: precision and trigger chambers in 3

layers (588 stations): I (inner) -

M (middle) - O(outer)

The Barrel Muon System

O

M

I

MDT - Monitored Drift Tubes (layers: I,O,M)

RPC - Resistive Plate Chambers (trigger) (layers M+M,O)

Trigger chambers (RPC) rate capability required ~ 1 kHz/cm2

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Barrel Chamber Installation

99% of Chambers installed. Chamber cables & Gas connections in progress Commissioning ongoing.

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Big Wheel –TGC1 assembly

Building 40/TGC-1

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Installation of MDT Wheel

TGC1 – “Park Position”

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Cosmic data taken with RPC,MDT,LV1 +Tile

Commissioning Using Cosmic Rays.

Muons recorded in sector 13

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Muon System Summary Barrel Muon:

Installation Completed > 99% Chambers installed.

Services installation (cables/gas) well under way.

Chamber commissioning underway.Data taking with Cosmic Ray started in selected regions.

EC Muons:

BW Side C: TGC/MDT Wheels completed - TGC2 on going

BW Side A: TGC1 on going

JD/SW (Side A&C): Surface Assembly.

Installation of the Muon System will be completed before the end of the year.

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• Barrel Calorimeter:•LAr Barrel EM•Tile Barrel Hadronic

•EC Calorimeters:•LAr EC Calorimeter

•EM Calorimeter•Hadronic Calorimeter•Forward Calorimeter

•Extended Barrel (Tile) Calorimeter

Calorimeter System

Tile barrelTile extended barrel

LAr forward cal. (FCAL)

LAr hadronic endcap (HEC)

LAr EM endcap (EMEC)

LAr EM barrel

Hermetic calorimeter

Total Coverage: II < 5

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The Calorimeters

trigger and measure the ,e and hadron energies by total absorption in sampling mode.

operate in a integrated dose of and n, ranging up to few Mrad.

maintain the energy scale precision at the 1% level.

allow particle identification

(, e, jets, ,..) --> longitudinal and transverse segmentation, preshower in the first X0s.

Fine Granularity & Longitudinal Segmentation

Barrel EM accordion, 0.025 x 0.025

Barrel HAD tiles, 0.10 x 0.10

a = 10% , b = 0.5%, c ~ 0.2 GeV

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Lowering Barrel EM Calorimeter

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APS meeting April 14h, 2007.30 November 4th 2005: Barrel Calorimeter in run position

Barrel Calorimeter Installation

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LAr Cool-down

Barrel Cool- down Temperature

80,00

100,00

120,00

140,00

160,00

180,00

200,00

220,00

240,00

260,00

280,00

300,00

12.04.2006 19.04.2006 26.04.2006 03.05.2006 10.05.2006 17.05.2006 24.05.2006

Date

Temperature (K)

Minimum detector temperature read on the cryo system

Maximum detector temperature read on the cryo system

Last updated 23-05-2006

gaseous N2cooling

liquid N2cooling

condensing Ar

The barrel calorimeter has been cooled down and filled with 45Kl of liquid argon.

Stable temperature Tmin = 88,2 K Tmax = 88,6 K

Isolation Vacuum < 5x10-7

Purity O2 < 2 ppm (lower limit of the measurement)

expansion vessel pressure

1,2

1,22

1,24

1,26

1,28

1,3

8.6.06 0:00 10.6.060:00

12.6.060:00

14.6.060:00

16.6.060:00

18.6.060:00

20.6.060:00

22.6.060:00

date

argon pressure (bara)

The calorimeter will now be kept cold for the duration of the experiment. (~ 20 Years)

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EC-A in Open Position

EC – A :cold and full of LAr.

EC – C : Cooling down

HV tests & front end electronics commissioning on going.

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LAr Barrel Commissioning APS meeting April 14h, 2007.

Commissioning - Noise Studies

Coherent noise observed was generated by Tile calorimeter.

Solution: add filters for the feedthrough heater connectors

Tiles LVPS OFF Tiles LVPS ON

17 MHz peak

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LAr Barrel Commissioning APS meeting April 14h, 2007.

Comic Ray Event:

Trigger on Tile Cal.

Combine run for Tile + LAr.

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• Barrel Calorimeter:• Installation completed• Services installation completed• LAr Cool down completed – calorimeter kept cold• Commissioning Tile & LAr using cosmic ray & Calibration Ongoing

• EC Calorimeters: • Mechanical Installation completed • Services installation on going• LAr- Side A Cold, Side C cooling down• Commissioning Started•Cosmic Ray – starting now.

Calorimeter System Summary

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• Barrel ID (SCT/TRT):• Transition Radiation Tracker (TRT) (e/p Sep) ( 4 105 channels)• Silicon Strip Detector (SCT) ( 6x106 channels)•Pixel Detector ( 108 channels)

• EC ID (Side C and Side A):•Transition Radiation Tracker (TRT) •Silicon Strip Detector (SCT)•Pixel Detector

• Beryllium beampipe:

Tracking System

II < 2.5

B=2 Tesla

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Barrel SCT/TRT integration on surface

Insertion - February 17, 2006

Combined tests on surface in: April - June 2006

TRT

SCT

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Barrel SCT/TRT installation

Installation 23-24th Aug. 2006.

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Barrel SCT/TRT Connected

Feb 19th ‘07

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Barrel TRT Threshold scanThreshold distribution over the channels at which noise counting rate reaches level 300 kHz. Each picture shows 50,000 channels

SR1 Pit

Performance in the Pit as good as in the Lab

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Pixel Layer 2 – half shell

Pixel Layer 2, once clamped, inside

Pixels assembly on the surface.

Pixel ECs at CERN

Pixel Package is close to being ready for installation.

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ID System Summary

Services installation nearly complete.

Barrel SCT/TRT installation completed.

EC SCT/TRT ready for installation on the surface (May/June).

Pixel + Beryllium beam pipe installation in June.

Barrel commissioning ongoing.

Commissioning of full system July-October ’07.

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High-Level Trigger

LEVEL-1 TRIGGER•Coarse granularity from calorimeter & muon systems

•2 s latency (2.5 s pipelines)

TRIGGER : THREE LEVELS

LEVEL-2 TRIGGER•Regions-of-Interest “seeds”•Full granularity for all subdetector systems•O(10 ms) target CPU time

EVENT FILTER •“Seeded” by Level 2 result•Full event access•Offline-like Algorithms•O(1 s) target CPU time

FIRST PART OF ATLAS RECONSTRUCTION AND PHYSICS EVENT SELECTION

40 MHz

~75 kHz

~2 kHz

200 Hz

Rates

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Counting Room Electronics

Phase 1 commissioning has really started

Readout Electronics installation on going.

DCS (Slow control) operational (Part of the system).

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SDX1

USA15

UX15

ATLAS – Counting & Control rooms

ATLASdetector

Read-Out

Drivers(RODs) First-

leveltrigger

Read-OutSubsystems

(ROSs)

UX15

USA15

Dedicated links

Timing Trigger Control (TTC)

1600Read-OutLinks

Gig

abit

Eth

erne

t

RoIBuilder

pROSR

egio

ns O

f Int

eres

t

VME~150PCs

Data of events acceptedby first-level trigger

Eve

nt d

ata

requ

ests

Del

ete

com

man

ds

Req

uest

ed e

vent

dat

a

stores LVL2output

Event data pushed @ ≤ 100 kHz, 1600 fragments of ~ 1 kByte each

Second-leveltrigger

LVL2Super-visor

SDX1

DataFlowManager

EventFilter(EF)

pROS

~ 500 ~1600

stores LVL2output

dual-CPU nodes

~100 ~30

Network switches

Event data pulled:partial events @ ≤ 100 kHz, full events @ ~ 3 kHz

Event rate ~ 200 HzData

storage

LocalStorage

SubFarmOutputs

(SFOs)

LVL2 farm

Network switches

EventBuilderSubFarm

Inputs

(SFIs)

Control Room

CERN computer center

Skeleton system is all counting and control rooms are operational.

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TDAQ networks - Installation & commissioning

Incremental installation started in 2006.

Full system will be completed in 2009 (deferred). Strategy::

Lay down the complete cabling infrastructure

Incrementally add devices (switches) when needed

In the early stage, redundancy is not considered a priority

Full redundancy is introduced in 2008

First usage in a “production” environment of monitoring tools

DataFlow Network

BackEnd Network

L2PUs

EFPs EFPs EFPs

SFIs

SFOs

Massstorage

SVs

ROS PC

ROB

ROB

ROBROB

ROB

ROB

ROS PC

ROB

ROB

ROBROB

ROB

ROB

Network root(to ATCN)

Control Network

ManagementNetwork

SFO

Switch

Online Racks

ManagementServers

Control LinksData LinksManagement links

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DAQ/HLT – InstallationFull ROS systemAssociated networking (data and control switches)Associated infrastructure (file and boot servers, online and monitoring machines,…)

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DAQ/HLT CommissioningIntegrated tests to verify sub-

system’s Functionality Stability Performance

Technical Runs Integrated tests in the control

room environment “shift-like” operations

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Commissioning Conclusions

Counting rooms infrastructure near completion.

Installation and commissioning of readout electronics – in progress.

System commissioning using the final chain – ongoing.

Multi-system commissioning started.

Technical runs using the main control room round the clock for Cosmic ray data, calibration data has started.

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SummaryThe detector installation is now well advanced and progressing well. Infrastructure: Essentially complete and commissioned. Magnets System: BT and Solenoid – commissioned , ECT installation, full test by end of ‘07. Calorimeters: Being commissioned (Barrel) EC to follow soon. Tracking: SCT/TRT Barrel being commissioned. EC and Pixel May/June ’07 Muons: Barrel Muon being commissioned. BW assembly in progress. SW integration

on surface – Installation toward end of ’07. Trigger/DAQ: Trigger and DAQ commissioning started. Control room operational – combined

“Data Taking” mode to start. (Cosmic Rays) Software / Physics (not covered here) Preparation for Data analysis is in full swing with

computing data challenges, Physics working groups etc

The coming year is critical to make sure that the detector will be ready for Data. A large effort is ongoing at CERN to accomplish this

challenge.

What was presented is a result of >20 years of R&D, Design and Construction of the ATLAS detector. The installation and commissioning is the “end of the

beginning” once the installation is complete the challenge will shift to operation and getting the Physics out.

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First Physics Run Middle of ’08.

The ATLAS Detector should be fully operational and ready for

Physics.

ATLAS Detector – status and plans

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