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resulting in 1600 scintillation photons within the forward capture cone of
resulting in 1600 scintillation photons within the forward capture cone of
the fiber. Assuming that 80% of these are delivered to the SiPM active
the fiber. Assuming that 80% of these are delivered to the SiPM active
surface and a conservative estimate of 15\% for the efficiency of the SiPM
surface and a conservative estimate of 15% for the efficiency of the SiPM
leads to an estimate of 190 for the average SiPM pixel count per event.
leads to an estimate of 190 for the average SiPM pixel count per event.
Monte Carlo simulations have shown that an efficient detection threshold
Monte Carlo simulations have shown that an efficient detection threshold
corresponds to 40\% of the average pulse height, or 80 SiPM pixels. This
corresponds to 40% of the average pulse height, or 80 SiPM pixels. This
implies a requirement for the dark rate that spontaneous pulses never
implies a requirement for the dark rate that spontaneous pulses never
exceed 80 pixels.
exceed 80 pixels.
== SiPM Measurements ==
== SiPM Measurements ==
{| class="wikitable" style="text-align:center" border="1" cellpadding="0"
|+ Summary of SiPM Properties measured at room temperature at the recommended -20.5V bias voltage
|-
!rowspan="2"| Device
!colspan="2"| Gain
!colspan="2"| PDE (yellow)
!colspan="2"| Dark Rate
|-
! Nom. !! Meas. !! Nom. !! Meas. !! Nom. !! Meas.
|-
| SSPM-050701GR-TO18 [http://www.photonique.ch/DataSheets/SSPM_050701GR_TO18_Rev1.pdf]
| 0.8×10<sup>6</sup> || 1.1×10<sup>6</sup> ||~29% || ~30% || 10 MHz || 9.8 MHz
|-
| SSPM-0606BG4-PCB [http://www.photonique.ch/DataSheets/SSPM_0606BG4MM_PCB_vs1.pdf]
| 1.5×10<sup>5</sup> || 2.5×10<sup>5</sup> || 27% || 20-23% || 15 MHz || 8.9 MHz
|}