SiPMs

Useful resources:

XAMS SiPMs

Data sheet

XAMS readout board design shown below.

Circuit design of signal filter boards used in XAMS lab.

Connecting the sensor to the filter

The SiPM has a cathode and an anode as can be seen in the schematic drawing below, the drawing also shows how the SiPM is oriented as a diode. A SiPM needs to be reversed biased, which means the voltage at the cathode is higher than at the anode. This way there is no current flowing until the electric field is so high the SiPM brakes down, the brake down voltages of the used SiPMs is also shown below. Sensor 1804 was already marked as defect, but we still used it to test our electronics just to be sure it worked without breaking a new sensor. This sensor first gave signals which made it seem like it was still working, but after switching around electronics we were not able to get a signal. We therefore decided to check all the used sensors if they are broken.

Schematic drawing of the S13370-3050CN SiPM

Serial No. Vop at M=2.55e6 [V] Id at Vop [μA] 1804 56.58 0.46 1805 56.69 0.47 1822 56.51 0.50

Wanting to check if a sensor is working correct we asked Martin van Beuzekom for the R & D lab to help us and helped us with a method to determine if a sensor is broken. First we wanted to check if the anode and cathode were indeed oriented as was depicted on the schematics.