PMT Calibration Bryan Musolf. Goals Transform raw data into graphs for 30 PMTs Observe how the gain and # of photoelectrons (PE) change as a LED intensity.

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Presentation transcript:

PMT Calibration Bryan Musolf

Goals Transform raw data into graphs for 30 PMTs Observe how the gain and # of photoelectrons (PE) change as a LED intensity changes Observe how the gain and # of PE change as high voltage changes Find the stable region of each PMT by analyzing the noise Extrapolate PMT data Ensure the linearity of each PMT Further test the PMTs

LED intensity Increasing the LED intensity while keeping the high voltage constant As the PMTs become saturated the PE cannot be measured accurately As the PE cannot be measured the gain is no longer constant

High Voltage Increasing the high voltage while keeping the LED intensity constant Comparing the experimental gain vs. the specification gain from the company Approximately1 PE should be hitting the PMT for these tests. This plot ensured that.

Noise counts / min and Extrapolation We then added the noise counts / min to find the stable region of each PMT We also extrapolated the data to find the high voltage that would give us a gain of 5E7 Our gain of 5E7 is right in the stable region of the PMT

All 30 PMT Spec gain vs. high voltage and gain vs. high voltage for all 30 PMT Our measured gain closely reflects the spec gain given to us by the company Gain plot starts to break down when PMTs start to become saturated

All 30 PMT Noise vs. high voltage and the extrapolation for all 30 PMT We have some very nice PMTs!! The extrapolation data will allow us to set high voltages to get specific gains

All 30 PMT Gain / Spec gain / Noise layered

Further testing We found that some of the PMT bases were broken and needed to be repaired In particular, R1 seemed to be the problem on most

Further Testing After fixing the bases we needed to make sure the PMT bases could withstand the LAr we would be using them in

Further Testing We also needed to make some splitters so we could connect the PMTs to a high voltage source and an oscilloscope to take measurements Needless to say, I got a little bit more efficient!

Further Testing We ran one test in liquid nitrogen Everything held up and we got a nice signal Testing in liquid nitrogen or LAr will be ready soon