Prsentation PowerPoint

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ECAL Test Beam 2004 _at_ CERN First results
S.Rosier-Lees, LAPP, Annecy-IN2P3/CNRS

Outline Introduction Ecal Setup EIB tests
(bus and trigger) Summary
AMS02 -TIM,Houston, 20-22 October
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AMS Electromagnetic CALorimeter
Ecal drawing
ECAL measures the energy deposited by charged and
neutral particles, ? accurate spectrum
measurements ? and e, 1 GeV - few TeV ?
Contribution to the overal e? / p? rejection (
with shower profile rejection of 1000) (with
or without magnet)
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ECAL structure

• In order to separate protons from positrons,
  maximum granularity is required
• 3d Sampling calorimeter with lead foils and
  scintillating fibers
• 9 superlayers with alternating x and y readout
• Total thickness is 166mm, corresponding to 17.2
  X0
• Total weight 638 kg

p?
e?
Lead foil (1mm)
Fibers (?1mm)
z
particle direction
18.5mm
y
x
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ECAL Instrumentation

• Fibers read by 324 4-pixels pmts
• FE readout electronics with ASIC
• 60 000 dynamic range,1296 channels
• Stand alone g trigger for physics of high energy
  cosmic gamma rays

Light collection system with Front end
electronics
Ecal Engineering Model
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ECAL electronics general view
ECAL crate
ECAL IntermediateBoard (EIB)
EPSFE
PMTFEE
ETRG
JINF
EDR
Trigger to ETRG
HV
LV
ANALOG (on ECAL)
POWER SUPPLY
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Combined tests TrackerEcal

• Why
•  Measure electron momentum by tracker , energy 
  by the  electromagnetic calorimeter (radiation
  losses) Measure converted   photons and confirm
  calculated energy and angular resolution Test 
  photon trigger   Tbeam 2004 WeB Page
• Common simulation tools

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Combined tests TrackerEcal

• Where PS experimental zone _at_ Cern,
• When 09/07 ? 10/07

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Combined tests TrackerEcal

• Who Ecal shift list
• Catherine Adloff, Pierre.Brun, Guy.Coignet,
  Corinne.Goy, Jonathan.Pochon
• Roman.Kossakowsky, Sylvie.Rosier,Jean-Pierre.Vial
  le - LAPP,
• X.B.Wang, Z.H.Li, G.M.Chen - IHEP, Julien.Bolmont
  - GAM ,
• W.Burger - Perugia ad members from Geneva
  tracker team
• What 3 energies (3,5,7) GeV,(e,?,?),
• Beam (on-off),
• Convertor (on,off)

Nacho Sevilla,10/14/04
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TB goals from the ECAL side

• Complementary, energy measurement ecal tracker
• EIB prototype validation
• Bus part
• Trigger part , threshold calibrations

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• A complementary energy measurement tracker

One layer 18 Pmts on the engineering ECAL 80
of the energy seen in one super layer
beam
Position measurement Silicon telescope
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EIB Functionality
EIB tests

• Signal Trigger on a threshold
• 9 Pmts connected to one EIB
• 36 EIBs in total of which 24 EIBs with Trigger
  function
• Regulation for Analog supply voltage Trigger
  and EFE
• Interface between EFE-EDR ? Signal bus

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EIB tests
EIB tests
EIB tests

• Bus (data, control and low voltage signals)
• Trigger

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Ecal setup
VME
LV1 from scintillator
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Intermediate Board
VME 1190
BTRG
Test bench for the EIB using a vme acquisition
driven by Labview
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BUS Tests

• Checks of the stability, noise, data quality
• for the 18 PMtsEFE Flight models,
  potted,equipped with the flight light collection
  system
• pedestals
• Gains
• Linearity
• MIP

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Pedestal Run 856 (in the middle)
Pedestal measurements
C side
Pedestal (mV)
ADC counts

Run number ? times
Noise ½ ADC channel
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e _at_ 7 GeV, C side signal on the low gain
Linearity
C side
Low Gain
High Gain(33)
Low Gain
High Gain
ADC counts
Gain 33.4 as expected
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A side
Low Gain
High Gain
e _at_ 7 GeV, A side Signal on the low gain
Linearity
Low Gain
High Gain
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Typical MiP
ECAL in vertical position
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Bus tests

• During 3 weeks
• stable running conditions,
• no channel lost
• Very good data quality
• ? Validation of the EIB Layout
• including (new cables, regulators and addums
  )

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Trigger tests
Dynode
Dynode?10 MAX4415 (C side) 1 EIB AD8014 (A
side) 2 EIB
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During the 2 first days Low trigger efficiency
10 ????
Almost no trigger No Pmt above the thresholds
Dark blue EFE dynode Light blue EFE dynode and
trigger dynode above the threshold
PMt above the threshold
Threshold
No efficiency for high signal 50 mV above the
threshold
EFE dynode (ADC Channel)
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Trigger data erased after 400 ns (autoreset)
but BDR acquisition wait for an external trigger
delivered within 350-400 ns High signals
(faster) were erased
threshold at 50 mV (trigger dynode)
Autoreset has been set to 1 µs on both
sides Trigger efficiency Almost 100 above the
threshold
EFE dynode (ADC Channel)
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PMt above the threshold
PMt above the threshold
Different thresholds 15 mV 50 mV 150 mv
PMt above the threshold
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thresholds 15 mV 50 mV 150 mv
EFE dynode (ADC Channel)
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A side Pmt 2
C side Pmt 1
Pmt 4
Pmt 3
Pmt 5
Pmt 6
EFE dynode (ADC Channel)
Effective threshold same for all the channels
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Pmt 8
Pmt 7
Pmt10
Pmt 9
Pmt 12
Pmt 11
EFE dynode (ADC Channel)
Effective threshold same for all the channels
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Threshold 15 mV
Threshold 50 mV
Dynode10 mV
Dynode10 mV
(Anode G 33 sum)/3 mV
(Anode G 33 sum)/3 mV
Toward a measurement of the effective threshold
using anode high gain signal
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Toward the standalone Ecal trigger
1) ECAL DAQ triggered with the ECAL Stand alone
trigger (a7-c6) 2) then included in the Lin
trigger box As a master trigger
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Summary

• First conclusions after this test beam
• EIB validation
• Trigger
• Data transfer and data control,Low Voltage signal
  
• cables
• Toward the EIB-QM ( Spring 2005)
• Choice of the final amplifier after a complete TB
  analysis
• Qualification of 2 components (advices from A.
  Kounine) .

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ECAL readout electronics - schematic
AMS acquisition
Control Signal (SC)
EFE
data
HV dividers
Chip 4 anodes 1 dynode
E I B
EDR
PMt
ADC
324
SC LV
324
Low voltage PS (LV)
324
Trigger
DC/DC converter
LAPP
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DAC command

• Thresholds set via a DAC control system for each
  EIB via the intermediate board, independently
• Threshold ranges
• 10 mV to 200 mV

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Standalone a7-c6
Threshold 20 mV
Threshold 100 mV,
(Anode G 33 sum)/3 mV
(Anode G 33 sum)/3 mV