Speaker
Description
The Hyper-Kamiokande (Hyper-K) experiment is a next generation underground water Cherenkov detector designed to search for leptonic CP-violation and a wide science program, including neutrino astrophysics, and searches for nucleon decay.
The main photo-sensor used in the experiment is the 20" box-and-line R12860 PMT, an improved version of the ones used in Super-Kamiokande. Due to the tank size in Hyper-K, the electronics will be placed underwater to minimize the length of the photomultiplier cables. Because of this and the new PMT models, a new signal readout system had to be developed.
The requirements for this new digitizer are the possibility to set the trigger threshold to a 1/6 of p.e., a maximum signal rate of more than 1MHz (in case of supernova and electrons from decay of muons) and a power consumption of less than 1 W per channel.
The final design has 12 single channels made of discrete electronic components. Each channel has an input receiver that sends the signal into two different paths: one that creates a digital trigger and the other that goes to an integrator and then to two ADCs that measure the signal charge. To collect the data from the 12 channels the board is equipped with a Xilinx Kintex-7 FPGA, that will also measure the Time-over-Threshold and Time-of-Arrival.
The whole board mounts a switching power supply custom designed to generate all the voltages needed by the components present on the board.
The design is almost complete and will be finalized in 2024.
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