Design of a general purpose data collection module for the NuTel telescope

Details Design of a general purpose data collection module for the NuTel telescope Design of a general purpose data collection module for the NuTel telescope

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nimpa.552..477v&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 552, Issue 3, p. 477-488.

Physics

Scientific paper

We have developed a Data Collection Module (DCM) to digitize, store and select data from the NuTel telescope, which observes Cherenkov photons from near horizontal air showers. Multi-anode photo-multiplier tubes (MAPMT) are used as photon-sensitive devices. DCM processes 32 input signals from the charge-sensitive pre-amplifiers located close to the MAPMT. The module design uses 40-MHz 10-bit pipeline ADCs and medium-size FPGAs. A programmable gain/attenuation control ×0.5 2 is applied to each channel before the ADC providing a comfortable operation with a multi-channel system using MAPMT as photon-sensitive device because the gain of MAPMT fluctuates from channel to channel as 1:3. DCM has a flexible on-board trigger inside FPGA firmware. The system design is made in 32-bit 33-MHz cPCI. Thirty-two DCMs housed in two crates process signals from the two telescopes of 512 channels each looking to the same direction for coincidence.

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