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Status of MiniCal analysis. MiniCal operational in e+ beam 3 types of photo-detectors available PM and SiPM preliminary analysis  beam calibration  cosmic calibration energy scan results Preliminary data/MC comparison APD first calibration with beam.

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status of minical analysis

Status of MiniCal analysis

  • MiniCal operational in e+ beam
  • 3 types of photo-detectors available
  • PM and SiPM preliminary analysis
  •  beam calibration
  •  cosmic calibration
  • energy scan results
  • Preliminary data/MC comparison
  • APD first calibration with beam
  • analysis of all data in progress
  • large group effort:
    • DESY, MEPHI, Prague, LPI, ITEP

Erika Garutti

the minical

e+ 1-6 GeV

The MiniCal

3x3 tiles per layer

Tile: 5x5x0.5 cm3

97%

Shower

contained

e+

1 cell = 3 tiles

combined in depth

Erika Garutti

test of 3 types of photo detectors

Silicon PhotoMultiplier (SiPM)

MEPhI&PULSAR

SiPM

Pixels of

the SiPM

Test of 3 types of Photo-Detectors
  • MA-PM –16 channels:
  • best photo-detector
  • cannot be operated in B
  • cell read out: 3 tiles connected to one channel

Only for reference

  • Silicon photo-multiplier (SiPM):
  • new detector concept, first test with beam
  • sizes: 1x1mm2, 1000 pixels/mm2
  • gain ~ 2*106, quantum eff. ~ 15-20%
  • single tile read out / mounted directly on tile
  • Avalanche photo-detector (APD):
  • already used by CERN experiments
  • gain ~ 500, quantum eff. ~ 75%
  • cell read out: 3 tiles

Erika Garutti

pm calibration with beam
PM Calibration with beam
  • Beam calibration

- individual tiles

- cell of 3 tiles

e+

Good reproducibility

- independent on material in front

- independent on repositioning

Analysis from Evgeni Devitsin, LPI

Erika Garutti

single tile calibration
Single tile calibration

Sum of single tile calibration

compared to cell calibration

- 108 tiles+WLF tested with source

 7% spread

  • 108 tile+WLF+PM
  •  16% spread

Analysis from Evgeni Devitsin, LPI

Erika Garutti

cell calibration
Cell calibration

Analysis from Evgeni Devitsin, LPI

Erika Garutti

cell calibration1
Cell calibration

Analysis from Evgeni Devitsin, LPI

Erika Garutti

cell calibration2
Cell calibration

Analysis from Evgeni Devitsin, LPI

Erika Garutti

pm calibration with cosmics
PM Calibration with cosmics

m

  • Cosmic ray calibration

- cell of 3 tiles

m

MIP position fitted with gauss+landau

  • MPV cosmic shifted with respect

to MPV e+

Analysis from Evgeni Devitsin

Erika Garutti

pm calibration
PM Calibration

Cell of 3 tiles single tile

Ped: 21.6 , s: 1.1

MIP: 81.1

<RMS>: 7.7 +/- 4.9

Ped: 21.3 , s: 0.9

MIP: 37.7

<RMS>: 8.4 +/- 1.3

Ped: 21.2 , s: 1.0

MIP: 36.6

<RMS>: 12.8 +/- 1.8

Ped: 20.5 , s: 1.5

MIP: 76.3

<RMS>: 10.5 +/- 6.2

Analysis from Evgeni Devitsin, LPI

Erika Garutti

shower development in pm
Shower development in PM

3 Gev e+ beam

  • 97% shower contained

in central tiles

  • 13 layers ~ 14 X0

Erika Garutti

energy resolution for pm readout
Energy Resolution for PM readout

Energy Sum

  • pedestal due to noise trigger

 reduced bump due to second particle in same trigger

  • different calib. lead to same dE/E
  • 5% systematic uncertainty

Erika Garutti

sipm calibration
SiPM Calibration

Single photoelectron peak visible with pre-amplifier  for calibration only

One photoelectron peak

MIP peak

pedestal

From MEPHI group

(E. Popova)

 See A. Karakash talk

Erika Garutti

shower development in sipm
Shower development in SiPM

Single layer readout

1 MIP peak visible

in first layer

Tile 2

Tile 1

Tile 3

Tile 4

Tile 5

Tile 6

Tile 7

Tile 8

95% shower contained for 3GeV beam

Tile 10

Tile 9

Erika Garutti

energy resolution for sipm
Energy Resolution for SiPM

Energy Sum

  • - non-linearity correction not applied
  • 5% systematic uncertainty
  •  GEANT3 with SiPM (see talk A. Raspereza)

1 GeV

2 GeV

4 GeV

3 GeV

5 GeV

6 GeV

Preliminary

E [MeV]

Erika Garutti

result comparison
Result Comparison
  • good agreement PM/SiPM
  • systematic uncertainty still to be
  • calculated (fix 5%)
  • SiPM non-linearity correction
  • both MC w/o tile LY variation ~7%
  • GEANT 3 with Poisson treatment
  • of ph.e. (SiPM)

Erika Garutti

apd calibration
APD Calibration
  • - tile calibration with source
    • correction factor for each cell

~ 20% spread (corrected)

  • 14 APD connected to cells of 3 tiles
  • tested with 3 GeV beam, no absorbers
  • Preamp from Prague (Ivo)
  • APD values for MIP calibration:

Ped: 18.9 , s: 9.9

MIP: 54.1 , RMS: 19.6

<RMS>: 17.2+/- 1.6

Compare to PM values:

Ped: 20.5 , s: 1.5

MIP: 76.3

<RMS>: 10.5 +/- 6.2

Erika Garutti

apd calibration1
APD Calibration

special PreAmp settings

T = 29 C

400 V : 20% spread for 10 APD

420 V : 26% spread for 10 APD

result from CERN test:

28% spread for the same APD

T = 25 C

Erika Garutti

apd voltage dependence
APD Voltage dependence
  • T = 29 C (stable)
  • exponential increase of gain
  • - smaller increase than observed at CERN

APD test at CERN

T = 25 C

Erika Garutti

preamp settings
PreAmp Settings

PreAmp conversion resistor: standard 1 k

2 k

0.5 k

1 k

10 k

Erika Garutti

led monitoring
LED monitoring

PIN diode

Stability ~1%

PM 2

550V

LED position corrected

for ped. and PIN diode

fluctuations:

Stability ~1%

PM 3

500V

from H. Meyer

  • LED monitoring system seams reliable
  • longer monitoring time needed

Erika Garutti

outlook
Outlook
  • Finish tests for all photo-detectors
  • Finalize data analysis + MC comparison
  •  LCIO format for data acquisition
  • fast comparison to MC
  • fast integration of other detectors
  • first hardware in this format !!!
  •  October: Test of ECAL/HCAL DAQ with the MiniCal

 2004 construction and operation of the Physics Prototype

Erika Garutti

apd test at cern
APD test at CERN

Characteristics of 40 APD tested

@ CERN (CMS test room):

  • quantum efficiency = 77.5% (500nm)
  •  stable at 1% level
  • capacitance ~30pF at 400V
  • gain vs voltage
  •  variation of ~5V at fixed gain
  • Variation of dM/dV:

With power supply stability ~10-3

10% gain variation(@ gain 500)

Temperature stability ~1oC

high sensitivity to T variation

Erika Garutti

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