Simulation Status and Problems for SiPM/APD

1
Simulation Status and Problems for SiPM/APD

• Pico-Second Timing Simulation Workshop
• University of Chicago, Chicago, USA
• December 12, 2006
• Alexandre Vaniachine, Robert Wagner (Argonne)

2
Excellent Idea

• I like the idea to develop SiPM simulations code
  very much
• Indeed, these new devices does not have any
  commonly adopted simulations tools in the public
  domain

3
Principle of Operation of SiPMT
(credit Claudio Piemonte,
ITC-irst)
diode structure
depletion width
V
n
p-
p
E
electric field in the reversed bias diode
full depletion
V lt VAPD gt photodiode
1 collected pair/generated pair VAPD lt V
ltVBD gt APD ltMgt
collected pairs/generated pair V gt VBD
gt Geiger-mode APD inf. collected
pairs/generated pair
4
Simple SiPM Features to be Reproduced by
Simulations

• Start with the single SiPM cell model
• Reproduce the measured separated peaks
• Depending on the temperature, integration (S/H)
  time, etc.

5
Simple SiPM Features to be Reproduced by Our SiPM
Model (2)

• Reproduce the saturation measurements

Line is a two parameter fit to
Measurement of saturation gives alternate
estimate of gain
6
Advanced SiPM Features to be Reproduced by Our
SiPM Model

• Reproduce the cross-talk measurements

7
Advanced SiPM Features to be Reproduced by Our
SiPM Model (2)

• Reproduce high-rate behavior affected by the
  dead-time in fired cells
• Reproduce the gain measurements from the current
  measurement
• Simulate the efficiency
• Simulate the timing performance (vs. number of
  photons)
• etc.

8
Conclusions

• If we will develop common SiPM simulations tools
  the SiPM Model - we could become the first who
  grabbed that growing research area