ECAL Progress

1
ECAL Progress

• Introduction
• Flight Model construction
• Mechanics and integration
• Electronics
• Test campaigns
• Cosmic tests
• Future test beam at Cern

• Sylvie Rosier-Lees - LAPP (Annecy)
• on behalf of the ECAL collaboration

2
Introduction

• ECAL collaboration
• ECAL aims and physics motivations
• Description

3
ECAL International Collaboration
IHEP Beijing, China (Group Leader Hesheng
Chen)
INFN Pisa and Siena, Italy (Group Leader F
Cervelli)
LAPP Annecy and LPTA Montpellier, France (Group
Leader JP Vialle)
Project responsible F. Cervelli
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A Calorimeter for AMS-02 (ECAL)

• Used in AMS as
• Particle ID
• Energy measurement (e,e,?)
• Trigger system on non interacting photons
• Anti-veto for electrons and positrons that
  deposit energy (tipically backscatter) on anti
  coincidence system

ECAL
ECAL last subdetector crossed by particles from
outer space
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Physics Motivations
An energy window still not covered 10 GeV 100
GeV
-Trigger and identifies photons which do not
interact -Good Energy resolution
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Physics Motivations
Positon flux
After 3 years of data taking with AMS (Ae 4.5
10-2m2.sr )
Heat Measurement
Requesting - Separation e/p to 5?10-2 (ECAL
standalone) - Separation e/p to 10-4 (including
tracking for energy/momentum match)
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A 3D Imaging calorimeter
Geant4 simulation
Electromagnetic particle e,e-,?
Hadronic particle p,He
a) Minimum ionising
10 GeV e
50 GeV p
b) Hadronic interaction
20 GeV e
50 GeV p
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ECAL pancake Light readout

• 9 alternate layers of lead and optical fibers
• Total weight 640 Kg
• Sensitive area 6565 cm2
• Radiation length 16 X0
• Interaction length 1 ?
• Light readout (X,Y layers)
• 4 pixel fine mesh PMTs (Hamamatsu)
• 35 fibers/pixel
• Segmentation
• Z direction 18 points
• X,Y direction 72 points (0.5 RM)

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Flight Model Construction

• Mechanics (I)
• Past
• Next steps
• Electronics (II and III)
• EIBs
• Ecrate
• Integration studies

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Mechanics (done)
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Mechanics (done)
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Mechanics (done)
PMT Tube to be assembled with the EFE (after
TV testing) LAPP, July 2005
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Mechanics (done)
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Mechanics, next steps Bolt replacements (272)
New torques to be applied
Torques will be lowered wrt the first assembly in
China(the type of the critical bolts will be
changed) after refine estimation from Jacobs
Torque wrench
View on critical bolts (joints 1 2)
Each ECAL structural bolt will be replaced one by
one (performed next week at LAPP) with Bruce
Sommer
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Mechanics, next steps Ecal radiator

• (2 out 4) ready at CGS
• Heater implemented
• surface treatment (special coating)
• Complete within 2 weeks

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Electronics

• Close to the detector
• Eibs
• On the (low) USS
• Ecrate
• HV bricks and ERPD (see E.Cortina RICH session)

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ECAL Electronics
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ECAL Electronics EIB (Lapp)

• Functionality
• Interface between EFE-EDR ? Signal bus
• Signal Trigger on a threshold
• 9 Pmts connected to one EIB
• 36 EIBs in total of which 24 EIBs with Trigger
  function
• CSIST will produce 45 boards (5 QM,
• 36 FM, 4 FS )

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ECAL Electronics EIB

• 4 QMs produced by CSIST and tested in October 2005

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ECAL Electronics EIB
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ECAL Electronics EIB
Summary everything ok, but the Clock signal
shape (sloppy edge) November 2005 at
LAPP Problem has been identified, reproduced
and a solution has been tested (_at_ cern with an
EDR, thanks to AK )
After introducing the buffer
CLK ADUM Output
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ECAL Electronics EIB

• Planning
• (following TEM _at_ csist 01/10/06, G.Ambrosi)
• PCB Production of the FM started January 06
• March Assembly of one QM2
• Tests at LAPP (2 weeks in April)
• Assembly of the FM EIBs started if QM2v2 tests ok
  (mid April)
• Ready for tests (acceptance, vibration and TV) in
  May
• Ready for integration in July

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ECAL Electronics EIB integration
EIB frame (Designed at LAPP)

• Role is twofold
• EIB mechanical frame,
• holding 2 EIBs (16) or 1 EIB(4)
• Cable tray (HV)

20 EIbs are produced
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ECAL Electronics Ecrate (Pisa)

• Per crate
• 6 EDR data reduction Board
• 3 EPSFE Power Supply for FE
• 1 ETRG trigger board
• 1 BackPlane
• 1 JINF (MIT)
• 2 crates for the ECAL

QM BOARDS
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Ecrate Electronics QM status

• Flight production flow Fagrel CGS (bid called
  soon)
• They are producing the QMs (one for board type)
  plus one EDR by CAEN
• EDR, EPSFE, EBP QM already produced and tested.
  Waiting at CGS for coating and final inspection

EDR
EBP crate
EPSFE
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Ecrate Electronics QM status

• ETRG QM final tests on EM last week (thanks
  VK,AK)
• QM production started

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Ecrate Electronics QM tests

• QM crate completed with EDRs EPSFE stuffed by
  a cheaper company
• TVT,vibration,EMI tests in Terni April or May.
• Test cards to feed EDRs ETRG ready
• FM production will start after Terni (and INFN
  bid). 6 to 8 months needed

Feed through for TV tests_at_terni
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Toward Final Integration

• Dallas Temperature sensors
• Preparing integration
• (ready for it at the end of 2006)
• Tools

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Thermal sensors

• Documentation
• to be provided to A.Koulemzine
• To be installed before EIBs assembly,
• ie Spring 06

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Thermal sensors
ECAL Dallas Thermal Sensor Integration (gluing in
between end caps)
PMT Tube (back side)
2 locations in between end caps
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Thermal sensors

• Cabling in progress (final length)
• Half side of the ECAL (32) already tested
• Further tests in collaboration with A.Koulemzine
• Including connections with HV brick
• the full EM with USCM (1 month cabling approx 15
  meters and 362 sensors) gluing

RAM
From the Bottom
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Integration studies

• Meeting RICHECAL, 01/30/06, close collaboration
• Previous studies made with a mock-up
• CAO simulation, optimizing the cabling
  lengths/trays. Powerful tool for Xchecks
• The lower USS2 will be needed soon

RAM
Two separate roads for the HV and DAQ cables
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Integration tools
2 positions in height (use of CERN crane)
Air cushions for smooth moving
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Tests Campaigns

• Cosmic tests
• Preparation of the 2006 Test beam _at_ CERN

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Cosmic tests

• _at_ LAPP on the FM ECAL, December 2005
• 27 pms ,
• HV Brick,
• EPSFE, EDR , JINF
• Backplane
• Thanks to A.K and V.K for providing materials

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Cosmic tests at LAPP
The third EIB(qm2v1)
2 EIBs (qm2v1) on the FM ecal
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27 HV CABLES
ECAL
EIB to EDR cables
LECROY BUS
LEMO connector
3.3
1 AMSWIRE cable adapted for ext trigger
1 AMSWIRE cable
220 V


220 V
(Only to reprogram Flash ROM in case of need)
PC Linux (Windows 2000 Or XP) ( run as root )
To be soldered on back plane
3.3
28
5
BRICK LOW VOLTAGES
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Results and Measurements

• 3 eibs (qm2v1) connected , 1 EPSFE, 1 EDR and 27
  Pmts powered together
• Consumption OK
• (-2.7 309 mA 3.8 482 mA)
• Regulation OK
• before regulator 2.44
  3.49
• after regulator (-1.99 -2.00)
  (2.99, 3.01)
• Logical Signal shapes OK
• DAC values set and measured (OK) on both eibs

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Typical MIP event
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Less usual event
Low gain
High gain
Dynode gain
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Pedestals and RMS
ADC counts
ADC counts
Pedestals for the 27?9 channels (values and rms)
(OK)
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MIP Measurements HV Brick
HV 800 Volts (default values), 27 pmts
powered MIP 60 ADC counts
ADC channels
ADC channels
Special events selections on extreme anode
channels (top and bottom) 4 out of 6 left for
MIP measurement
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MIP measurements Nominal HV
Lecroy HV PS corresponding to 2105 gain ( 650
Volts) 9 pmts powered MIP 15 ADC counts
ADC counts
ADC counts
Special events selections extreme anode channels
(top and bottom) 4 out of 6 left for MIP
measurement
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MIP distributions
HV 800 Volts
HV corresponding to a gain of 2105
ADC counts
ADC counts
High energy ranges can be explored (ie up to TeV)
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MIP distributions
PMts Gain variation HV complementary
analysis
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Test Beam at CERN
A long experience .
2004combined tests with the tracker team,
validation of the analog part of the trigger
2002EM performance measurements, calorimeter, HV
bricks and EFE
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Test Beam at CERN (2006)

• Request 2 weeks in the period (09/06 -10/06)
• Calibrate the FM Ecal
• Performance of the trigger
• Perform measurements of e/p rejection,
• Perform measurements of energy and angular
  resolution

To be adapted for ECAL fixation
At lapp, since fall 2005
Re use of a former L3 Experiment table (BGO
calibration) (provided by Univ. GENEVA)
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Test Beam at CERN (2006)

• Power supply (HV and LV)
• Important to have the all FM HV bricks ready (6)
• 2 complete Ecrates
• One is ready
• Second built in May (cheaper boards)
• Need of one JinFv2 (EM) board
• Eibs
• FM boards, to be installed in July

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Summary

• Calorimeter should be ready for the test beam
• in September
• Integration studies in progress, ECAL could
• be ready for final integration at the end of the
• year
• Lets wait for real data .