The SiPM ProjectAdvisors: Dr. Randal Ruchti

Barry Baumbaugh Mike McKenna

Teacher: Mark Kirzeder

Student: Elizabeth Shearer

Silicon Photo Multiplier A new generation of detection system.

An alternative to traditional PMTs.

What is a SiPM?

SiPMs vs. PMTs Small Low voltage Relatively low cost Recoverability Signal consistency Unaffected by B –

field Single photon

counting ability Fast response time

Relatively Large High voltage Expensive Non-recoverable Inconsistent signals Affected by B – fields Not as precise Slower response time

SiPM Drawbacks

Optical cross talk Temperature dependence on dark count Susceptible to radiation?

Summer 2008 Goals

Construct experimental apparatus Devise experimental procedure to test

SiPM performance Voltage 69 – 71 Volts Temperature RT - -35 Co

SiPM size 25 – 100 μm

New Light Tight Box

Cooling Experiment

Thermo Electric Coolers (TECs). Much more difficult than anticipated. Factors tested

TEC Size TEC Numbers TEC arrangements TEC current and voltage Heat sink size Cooling of heat sink, air vs. water

Cooling Chamber

Aluminum Heat Sink

Ice Water Tube from Chiller

Nitrogen Gas Tube

TECs

Copper SiPM Mount

Temperature Probes

Cooling Data – 3rd Try

Cooling Data – 262nd Try

Voltage & Temp Testing

To benchmark the SiPM an LED was pulsed

Data was gathered at varying temperatures and voltages Thank you Betsy

SiPM @ 69.4 V & 22 Co

SiPM @ 69.4 V & 9 Co

Conclusion

Continue to work on background noise in the system

Investigate SiPM performance below -20 Co

Hook SiPM to a scintillating tile and wave shifting fiber

Hook SiPM to a wave shifting and scintillating fiber