esteban cristaldo jorge molina...jorge molina laboratorio de mecánica y energía (lme) facultad de...
TRANSCRIPT
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TIMING RESOLUTION OF ACTIVE GANGING OF 48 SiPMs
ESTEBAN CRISTALDOJORGE MOLINA
Laboratorio de Mecánica y Energía (LME)Facultad de Ingeniería de la Universidad Nacional de Asunción (FIUNA)
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Brief description◦ I will present the preliminary results of the simulations of timing resolution of
the amplified signals of 48 SiPMs by the transimpedance active gangingconfiguration.
◦ I will try to establish a relationship between the signal’s dynamiccharacteristics and the arrival time separation of photons hitting the detectorin order to distinguish individual photon hits at the output.
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Active Ganging scheme
Transimpedance
Output
Hamamatsu S13360-6050
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Simulation outline
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Dynamic characteristics of the simulated signal:Rise Time (tr) : 97 nsFall Time (tf) : 619.5 nsTime to begin Fall (tbf) : ~200ns
The time to begin the fall is measured from t(Vp10%) at the rising edge to t(Vp90%) at the falling edge.
tbf
tr tf
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1 PE
3 PESimulated event where 10 photon hitthe detector with exponential distribution ofarrival time. The first peak is the fast component withτ = 6 ns followed by photons arriving with τ = 1,6 us.
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1 PE
3 PE
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~260 ns ~300 ns
Single photon peaks can be clearly seen with a time separation of 300 ns and above 200 ns.
Peaks below 200 ns of time separation start mergin in each other and blend as a fast arriving photon.
𝑡𝑠 > 𝑡𝑏𝑓
The signal peak is distinguishablebecause it has time to fall
𝑡𝑠
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~110 ns
Two photons arriving with a separation of 110 nsproduce a single double peak.
The signal peak merge as one because:
𝑡𝑠 < 𝑡𝑏𝑓
𝑡𝑠
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Increasing the number of hits in one detector to 100illustrates the limits of the timing resolution of the active ganging amplifier.
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Increasing the number of hits in one detector to 100illustrates the limits of the timing resolution of the active ganging amplifier.
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Multiple photon hits blending in one peak. Multiple photons arriving under the time resolutionare packed in one peak.
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◦ Apparently, the time resolution of this configuration is around 200 ns,meaning it cannot distinguish photons arriving less than 200 ns apart.
◦ To have a better view of the time resolution, photon hits can be simulatedarriving at fixed time rate of:◦ 300 ns
◦ 200 ns
◦ 150 ns
◦ 100 ns
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With 300 ns arrival time, the peaks are clearlydistinguishable.
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With 200 ns arrival time, the peaks are still clearlydistinguishable, but single photon peaks arrivingnearly can be missed.
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With 150 ns arrival time, peak amplitude is nearlycompletely attenuated for single photon hits.
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With 100 ns arrival time, the peaks are completelyundistinguishable.
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Conclusions◦ Based on observations of this simulations, I conclude that for a signal with a
rise time of 97 ns it may be posible to distinguish photons arriving 200 nsappart, down to 150 ns if good SNR is achieved.
◦ By extrapolation, to be able to obtain a timing resolution of 100 ns the risetime of the signal must be 60 ns or less and a time to begin the fall of ~100 ns.
◦ Statistical data on based on this kind of simulation can be produced todetermine the signal parameters more accurately.
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Thanks for your attention.