ATLAS Detector status and plans

1
ATLAS Detector status and plans
David Lissauer Brookhaven National Lab. ATLAS
Technical Coordination
APS meeting April 14th , 2007
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LHC Complex

• ?s 14 TeV
• (7 times higher than Tevatron/FNAL)
• Ldesign 1034 cm-2 s-1
• (gt102 higher than Tevatron/FNAL)

ATLAS and CMS pp, general purpose
Physics Runs expected to start in 2008
ALICE heavy ions
LHCb pp, B-physics
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? The Experimental Challenge
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Cross Sections and Production Rates
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 lt mH lt 1000 GeV Physics beyond the SM up to
the TeV-range Supersymmetry, 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
as .
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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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June 08 1030
Fall 08 1032
End of 08/09 1033
Gradual Luminosity ramp up
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The ATLAS Collaboration
International ATLAS 35
Countries 164 Institutions 1800 Scientific
Authors US ATLAS 40 Institutions gt 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
Muon System
Toroid System
26 m
Tracking System
Calorimeter System
25 m
50m
Overall Weight 7000 Tons - light Ship in a
bottle
100 m Underground.
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Magnet System

• Central Solenoid
• Solenoid Field in Inner Tracking Volume
• Air Core Toroid System
• Barrel Toroid
• EC Toroids
• Toroid Field for Muon system.

End-Cap Toroid 8 coils in a common cryostat
Barrel Toroid 8 separate coils
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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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Central Solenoid Commissioning
Field mapping machine in the Cryostat bore
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
250,000 points measured Agreement with
calculation better than 10 Gauss
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Barrel Toroid
25 m
Last coil Installed. Jacks released Sept.
29 2005
5 m
Mechanical Assembly completed end of
05. Assembly completed well within tolerance !!!
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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
Cool down Tests in Situ July/Sept 06 2.5
month
Complicated field due to coils aspect ratio Fe
in the Tile Calorimeter and HS structure around
the magnet.
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Magnetic Field Mapping
Perturbation to the filed due to the Fe in the HS
structure.
Color scale max 300 G
Color scale max 300 G
Barrel Field measured Diff. of up to 50 Gauss in
outer chambers due to Fe distribution uncertainty
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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
Turret assembly in preparation
Cover
Cryostat
Cold Mass
Cold Mass Insertion in the Cryostat. Cool down to
start in May.
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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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Muon System

• Barrel Muon System (3 Layers)
• Forward Muon System
• Small wheel Assembly
• Big Wheels Assembly
• EO Chambers

IhI lt 2.7 Air-Core Toroid system High
resolution Monitored Drift tube CSC (Very
Forward) Trigger Chambers RPC and TGC
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The Barrel Muon System
Trigger chambers (RPC) rate capability required
1 kHz/cm2
Barrel precision and trigger chambers in 3
layers (588 stations) I
(inner) - M (middle) - O(outer)
O
I
MDT - Monitored Drift Tubes (layers I,O,M) RPC -
Resistive Plate Chambers (trigger) (layers MM,O)
M
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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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Commissioning Using Cosmic Rays.

Cosmic data taken with RPC,MDT,LV1 Tile
Muons recorded in sector 13
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Muon System Summary

• Barrel Muon
• Installation Completed gt 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 AC) Surface Assembly.

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

• Barrel Calorimeter
• LAr Barrel EM
• Tile Barrel Hadronic
• EC Calorimeters
• LAr EC Calorimeter
• EM Calorimeter
• Hadronic Calorimeter
• Forward Calorimeter
• Extended Barrel (Tile) Calorimeter

LAr EM endcap (EMEC)
Tile barrel
Tile extended barrel
LAr hadronic endcap (HEC)
Hermetic calorimeter Total Coverage IhI lt 5
LAr EM barrel
LAr forward cal. (FCAL)
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The Calorimeters
Fine Granularity Longitudinal Segmentation
Barrel EM accordion, 0.025 ? x 0.025 ? Barrel
HAD tiles, 0.10 ? x 0.10 ?

• trigger and measure the ?,e and hadron energies
  by total absorption in sampling mode.
• operate in a integrated dose of g and n, ranging
  up to few Mrad.
• maintain the energy scale precision at the 1
  level.
• allow particle identification (?, e, jets, ,..)
  --gt longitudinal and transverse segmentation,
  preshower in the first X0s.

a 10 , b 0.5, c 0.2 GeV
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Lowering Barrel EM Calorimeter
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Barrel Calorimeter Installation
November 4th 2005 Barrel Calorimeter in run
position
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LAr Cool-down
The barrel calorimeter has been cooled down and
filled with 45Kl of liquid argon.
liquid N2 cooling
gaseous N2 cooling
condensing Ar
Stable temperature Tmin 88,2 K Tmax
88,6 K Isolation Vacuum lt 5x10-7 Purity O2
lt 2 ppm (lower limit of the measurement)
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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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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Comic Ray Event Trigger on Tile Cal. Combine
run for Tile LAr.
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Calorimeter System Summary

• 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.

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Tracking System

• 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

IhI lt 2.5 B2 Tesla
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Barrel SCT/TRT integration on surface
TRT
SCT
Insertion - February 17, 2006 Combined tests on
surface in April - June 2006
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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 scan

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

Pit
SR1
Performance in the Pit as good as in the Lab
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Pixels assembly on the surface.
Pixel Layer 2 half shell
Pixel ECs at CERN
Pixel Package is close to being ready for
installation.
Pixel Layer 2, once clamped, inside
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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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TRIGGER THREE LEVELS
Rates

• LEVEL-1 TRIGGER
• Coarse granularity from calorimeter muon
  systems
• 2 ms latency (2.5 ms pipelines)

High-Level Trigger

• 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
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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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ATLAS Counting Control rooms
Second- level trigger
CERN computer center
SDX1
pROS
stores LVL2 output
Control Room
USA15
Event data requests Delete commands
Gigabit Ethernet
Requested event data
UX15
Regions Of Interest
USA15
Data of events accepted by first-level trigger
1600 Read- Out Links
150 PCs
VME
Dedicated links
ATLAS detector
Read- Out Drivers (RODs)
Read-Out Subsystems (ROSs)
First- level trigger
RoI Builder
UX15
Skeleton system is all counting and control rooms
are operational.
Timing Trigger Control (TTC)
Event data pushed _at_ 100 kHz, 1600 fragments of
1 kByte each
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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

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DAQ/HLT Installation

• Full ROS system
• Associated networking (data and control switches)
• Associated infrastructure (file and boot servers,
  online and monitoring machines,)

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DAQ/HLT Commissioning

• Integrated tests to verify sub-systems
• 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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Summary

• The 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

What was presented is a result of gt20 years of
RD, 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.
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.
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First Physics Run Middle of 08. The ATLAS
Detector should be fully operational and ready
for Physics.