1. The ATLAS Tiles Hadronic Calorimeter
Status Of:
Construction
Testing
Calibration
Irene Vichou, UoA
18/04/2003
Irene Vichou, HEP2003, Athens(GR)

2. Irene Vichou, HEP2003, Athens(GR)
Layout of the Talk
Description of the TileCal detector
Role in ATLAS
Performance issues
Achievements on the construction
Mechanics / Optics
Electronics
Pre-assembly
Calibration and Testing
Relevant performance
Steps that we still have to climb…
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

3. The TileCal detector in ATLAS
Sampling Fe/Scintillator
3 cylinders of 64 modules
Dimensions
Total weight 2900 T
64x(B~21 T / EB~11 T)
~10K r/o channels
|h| coverage up to 1.7
R=4.3m
BARREL EB
R=2.3m
Consists of : modules, weight, dimensions, eta coverage,
5.6m
2.9m
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

4. Irene Vichou, HEP2003, Athens(GR)
TileCal principle
PMT
fibre
tiles
Steel/Scintillating tiles and fibres
Thickness of Steel:4mm, Tile:3mm
11 tiles radially read by 2 fibres
Segmentation easy by construction
Dh x Df = 0.1 x 0.1
3 radial samplings (1.4,4.0,1.8 l at h=0 )
Good hermeticity
Nice solution for housing electronics
One TileCal
Module
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

5. TileCal hadronic calorimeter
Role of TileCal:
Reconstruct the energy and direction of jets and hadrons
Contribute to the ETmiss measurement
Assist to the e/g identification (leakage cut)
Help in m identification (clean signal in 3rd sampling)
Monitor the luminosity by the minimum bias events current
Performance issues:
Energy resolution
Linearity 1%-2%
from few GeV to ~TeV
S/N for m’s
Overall ~6 (digital electronics)
3rd sampling ~2 ( for LVL1 analogue sums)
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

6. TileCal construction (mechanics and optics)
The detector consists of 3 cylinders of 64 modules each.
All modules are constructed and instrumented optically!!
Type
Construction
Optics
Time
Barrel
Russia
CERN
July 99-
Sept 02
Ext. Barrel A
USA
Dec 99-
Oct 02
Ext. Barrel C
Spain
Sept 99-
May 02
Finished!
Materials from 10
institutes
Delicate procedure! Optical elements per module:
3355 (1852) tiles for a Barrel (Ext. Barrel)
Number of fibres is twice the above
26 to 92 fibres read by a PMT
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

7. TileCal Instrumentation
A barrel module during optics instrumentation with tiles and fibres
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

8. TileCal Modules stored
Building 175
Building 185
All modules arrive at CERN
for cylinder pre-assembly
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

9. Optics Quality Control
One readout cell
All individual optical components
are “seen” in this shadowgram.
A hydraulically driven Cs source system scans the cells
The individual optics elements responses are extracted
Their uniformity should be < 10%
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

10. Optics Quality Results
Uniformity of optics response
inside a cell (goal was 10%) 7%
Barrel Modules
Ext. Barrel Modules 7%
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

11. Preassembly of Ext. Barrel
Started in Nov 2002 and finished 3 days ago!
Reasons to pre-assemble:
Test the assembly, develop and use tooling
Correct positioning, study deformations
Steps ready to repeat in the pit
Next steps:
Dis-assemble the cylinder except 18 base modules
(they will be lowered on their cradle in the ATLAS pit)
Do the same for the other two cylinders
Test dummy weight of the cryostat inside TileCal
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

12. Irene Vichou, HEP2003, Athens(GR)
Ext. Barrel Cylinder
Webcam image of the pre-assembly 3 days ago !!!
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

13. Ext. Barrel Cylinder The Ext. Barrel cylinder pre-assembly
Height :8.5 m
Weight ~700 T
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

14. Irene Vichou, HEP2003, Athens(GR)
TileCal Electronics
Particles from
detector
Mixer
PMT
Divider
3-in-1
Optical Link
Interface
ADC
Integrator
Adder
ROD
DC Calibrations
TTC
Mother
Board
Block
L H
Drawer
Laser
Digitiser
On detector
Pulse calibration
Cs, MinBias
particles
External
Trigger
Hadron
Trigger
Energy
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

15. Irene Vichou, HEP2003, Athens(GR)
Drawer Electronics
Readout electronics
HV distributor
PMT block
Assembled/tested in Athens
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

16. Irene Vichou, HEP2003, Athens(GR)
Status of electronics
PMT Blocks (10000 in total)
45% produced and tested at the University of Athens (materials coming from 10 other labs)
Drawers production
Series assembly just started in France
All components are available in time for production
Digitizers and Adders have started being produced in series.
External electronics
R&D almost finished, final kick-off next year (RODs, optical links)
Drawers getting ready for
the Barrel pre-assembly
Very strict QC protocols are applied in testing our electronics
either individually or in assemblies!
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

17. Irene Vichou, HEP2003, Athens(GR)
Particle beam tests
Setup for testbeam
calibration
e, m
e, m, p
This is where the detector becomes “alive”:
TileCal tested together with ATLAS r/o and DAQ components
1 out of 8 modules exposed
set the EM scale of the cells (pCb/GeV value)
check the uniformity
transfer of mip m’s response via Cs data across detector
setup trigger conditions
optimise hardware settings, e.g timing
test E,t reconstruction algorithms
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

18. Highlights from testbeam
Electrons at 90o, pCb/GeV values in different modules:
Applied optimal filtering in pulse reconstruction online (for ROD):
improvement in E resolution by 15% for p’s
Tested m reconstruction efficiency in last sampling to assist in the
LVL1 trigger (complementary to m system)
This is the last year of calibration for TileCal.
Next year’s run is combined with the EM calorimeter, including tests
at very low energies (~1 GeV).
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

19. Simulation: use of Geant4
Electrons
Pions
Muons
G3 vs G4 vs testbeam data
G4 is closer to TileCal testbeam data, but improvements are expected
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

20. Irene Vichou, HEP2003, Athens(GR)
Next important step
Certification, Calibration of Barrel modules:
Test modules equipped with electronics
Use final ATLAS r/o and DAQ hardware
Set their final operating conditions (HV, gains etc)
Store the constants in a final database for ATLAS use
Preassembly of the cylinder
Run the Cs source in full scale TileCal
This will be a useful testbench on how to commission and operate
the detector!
It’s a complicated project and a working group is already in place.
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

21. Area for certification
CERN, B175
Clean area for certification
and preparation
Control Rooms
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

22. The University of Athens ATLAS TileCal Group
Members:
Antonaki A., Fassouliotis D., Giakoumopoulou V.,
Giokaris N., Lembesi M., Manousakis A., Morphi M.,
Tatsis S., Tzanakos G., Vichou I.
Responsibilities are:
PMT blocks assembly, test and characterization
Participation in:
Certification and calibration procedure:
Cs source monitoring system
Database development for final certification results
Performance studies:
Jet absolute energy scale calibration
Irene Vichou, HEP2003, Athens(GR)
18/04/2003

23. Conclusions and Outlook
Up to now:
The detector construction has finished.
The pre-assembly of one wheel was successfully completed!
The performance of TileCal is well understood with testbeam and Monte-Carlo.
Electronics production is under control.
Near future:
Equip all modules with electronics
Finish testbeam calibration this summer
Pre-assemble barrel and 2nd Ext. Barrel cylinder and practice on how to commission TileCal
Start assembly in the pit (mid-2004)
More distant future:
Commissioning in the pit
Well-known physics to check the detector (LHC start)
Ready for more exciting physics!
Irene Vichou, HEP2003, Athens(GR)
18/04/2003