Progress report on APD zThe schematics of Hamamatsu APD circuit. This doesn’t reflect internal elements of different pre-amps, for which output part and load must be modified slightly.

Progress report on APD zThis is a data from Gain measurements using the green LED. zThe graph on the next slide shows the data obtained in NICADD and data provided by manufacturer.

Progress report on APD

zThis is a fit to the gain data, done in Origin 6.1 software. Points were fitted into formula:

Progress report on APD zThis is a crosstalk measurement between neighboring APD element. zFor signal from LED< equivalent to 800 MIPs, crosstalk is less then 4%-3%, for a real-life signal with maximum of 100 MIPs this number is expected to decrease even further.

Progress report on APD zAbove are the results of the channel-by-channel test. Red areas indicate the APD elements that have characteristics much worse then the green and yellow ones.

Progress report on APD zAPD connection circuit is realized and is working zFast measurements of Gain of APD were performed zAll elements of APD matrix were tested zNo change in APD temperature was detected during tests zWork is ongoing on the second PC board for the second APD zNext, pre-amp will be connected and all channels tested zAlso, there are plans to measure the Gain vs. temperature of APD Summary