Diapositiva 1

1
Overview of the CTB results
Maria Jose Costa, CERN
ATLAS week 18th February, 2005
2
Contents

• Motivations for the combined test beam
• Setup at H8
• Data taken
• Simulation software
• Reconstruction software
• Preliminary results
• Inner Detector
• Calorimeters
• Muons
• Combined
• Conclusions

3
Motivations

• Combined test beam ATLAS slice ? allowed us to
  test
• Integration of all detectors in a common readout
• Detectors with final electronics and RODs
• Full DAQ chain, DCS and configurations database
• Monitoring (ROD level EF)
• Trigger studies during the 25 ns period
• HLT infrastructure reconstruction algorithms
• Integration of people!
• Offline reconstruction
• Simulation
• Analysis
• Alignment and calibrations
• Verify detector standalone performance
• ATLAS combined performance
• Improve simulation

DONE during the data taken period GREAT SUCCESS!
IN PROGRESS A lot has been done a lot needs to
be done
4
Setup at H8
Muon system
ID and calorimeters
5
Data taken in combined mode

• Electrons/pions
• Energy scans 1-250 GeV
• Eta scans 0-1.2
• Phi scans
• Material studies
• Al plates in front of LAr (eta 0.4)
• Al plates between Inner Detector parts (E 1-180
  GeV)
• Magnetic field scans
• Pions/Muons
• Energy 320 GeV, 350 GeV
• Eta scans (phi0)
• 25 ns run
• Pions/protons at 350 GeV and Muons/pions at 180
  GeV
• Muons (100-350 GeV)
• Magnetic field scans
• Photons 180 electron beam (30 GeV photons)

Total 90 millions events 4.6 TB Done
with evolving CTB setup
6
Simulation
M.Gallas et al.
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Simulation

• The package to run the CTB simulation (CTB_G4Sim)
  aims for
• Preparation of the software reconstruction
• Pre-production has been done since August 2004
• Analysis of the CTB data
• Need to deal with the final setup used (which is
  not unique)
• The fully combined setup (from October 12th on)
  is ready
• Coming up for Rome release
• Infrastructure to deal with all different
  configurations
• Combined mode
• Photon beams
• Material studies
• Calibrations
• Run conditions infrastructure
• Use of the realistic field map (instead of
  constant)

8
Reconstruction

• Full reconstruction is run in Athena using the
  ATLAS software
• Small adaptation to reconstruction algorithms
  themselves but big effort to deal with CTB
  geometry.

• A package called RecExTB has been
• setup to run the CTB reconstruction.

• The reconstruction chain works for
• the different detectors for both real
• and simulated data.

• For real data needs to
• Deal with alignment and
• calibrations
• Real detectors (imperfections)
• Use Conditions database
• All this infrastructure was tested for the first
  time thanks to the CTB!

• The LVL2 ID algorithms do also run in
• RecExTB.

9
Preliminary results

• Preliminary results for the different subsystems
  have been obtained
• A few remarks
• Work on calibrations and alignment corrections is
  still on going (main effort during last months)
• Conditions database integration major focus
• B field map still approximate
• The software infrastructure to allow for combined
  results have just started
• Track to calorimeters extrapolations
• Combined tracking ID-Muons
• ?? ? No combined results yet
• ? Preliminary studies at the level of
  correlations

10
Inner Detector
R.Petti et al.

• Activities in the last months have been
  concentrated on
• Data validation ? 22.1 millions of good events
  with full ID
• Detector description to deal with the different
  detector setups
• 5 different versions for the combined period
• Check that the amount of material is as expected
• Alignment and calibrations
• SiliconTRT alignment
• T0s and R-t relations for TRT
• Dead and noisy channels
• First MC/Data comparisons are being performed

11
Inner Detector
Results obtained after Alignment and TRT
calibrations (t0,R-t)
Pixels ?14?m
SCT ?24?m
TRT residuals wrt Si track Rotation
40mrad Shift y -1mm
TRT ?150?m
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Inner Detector
Momentum reconstruction
Run 2102130 9 GeV pions B 1.4 T
Preliminary
TB fitter
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LAr Calorimeter
M.Aleksa,I.Wingerter et al.

• Detailed studies are being done to
• Improve calibrations (reconstruction of the
  signal peak)
• Pedestal/Ramps stability and temperature
  dependence
• Computation of OFCs by 2 different methods to
  minimize noise (need to understand timing issues)
• Understand HV dependence and material effects
• Compare the performance of the different
  clustering algorithms for the different kind of
  particles.

14
LAr Calorimeter
HV studies

• HV corrections can be applied to
• the reconstructed energy.

Preliminary
15
LAr Calorimeter
First results with the photon run
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Tile Calorimeter
T.Davidek,C.Santoni et al.

• Calibrations are in very good shape since August
• Channel stability within 0.5 except 1 channel
  (1 off)

Energy resolution for pions

• A method for cluster noise suppression is under
  study based on signal energy
• and time

17
Tile Calorimeter
Response to Muons
Very good signal to noise ratio for muons
18
Muons
F.Cerutti, S.Rosati et al.

• A lot of work has been done to improve the
  alignment and calibrations

MDT Calibrations

• All t0s and R-t relations
• have been computed

19
Muons
Alignment

• The Muon alignment system was tested successfully
  to align the chambers.

• Relative alignment is in very good shape
• First results on the absolute alignment have
  been obtained

20
Muons
momentum
Momentum reconstruction

• Nominal energy 120 GeV
• Energy loss 12 GeV
• corresponds to 6.5m iron
• (beam dumpTileLAr)

G4 simulated data ?(s)intrinsic 40.4 ? 2.8
?m x/X0 33.7 ? 2.8
Real data ?(s)intrinsic 47.5 ? 4.4 ?m x/X0
34.1 ? 4.3
21
Muons
Trigger performance during the 25 ns run

• RPC running in self-triggering mode
• The Region-of-Interest trigger information
  successfully transmitted to the LVL1.
• Full integration with all subdetectors using
  MuonCalo trigger sent by the CTP.
• Preliminary Trigger efficiency
• RPC (phi,3/4) 99.4
• TGC 98

22
Combined
Track to Calorimeters
C.Bourdarios et al.

• A new tool has been created to extrapolate from
  a track reconstructed by
• either the ID or the Muon system to the
  Calorimeters.
• First tests have been done with the ID.

Preliminary
The ID-LAr alignment work can now start
23
Combined
Inner Detector - Muon matching

• After extrapolating Muon tracks
• to the perigee (taking material
• effects into account)

• Comparison of the p reconstructed
• with the MDT and TRT

z Muon sytem
S.Hassani
G.Avolio
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Conclusions

• The CTB has been a very successful exercise for
  all communities
• Detector, TDAQ, DCS goals were accomplished
• The ATLAS reconstruction and simulation software
  has also been successfully tested
• The standalone reconstruction of the individual
  detectors is in a good shape to start real
  combined analysis.
• Data has been validated and all detectors made
  already clear requirements for the MC production
• A new production for simulation and
  reconstruction is expected for March and a second
  one for April to be ready for Rome (although more
  refined analysis are expected to go on)
• The CTB life will continue in the combined
  performance group

25
Backup slides
26
Reconstruction