Today Myrdin and Stephan started to put together the sensor head of Chaos-Jr. Two spare Solo-EPD-HET-B detectors were put into a spare HET housing. The wires were soldered to the preamplifier board that was assembled by Sophie. The sensor is now connected to a RPiRENA on a Raspberry Pi1 and is taking data. Next we will put a ²⁰⁷Bi Source next to the sensor to perform a calibration with gamma and X-rays.
Observe how two preamplifiers are still unconnected. That is where the photodiodes from the BGO scintillator will be connected.