Development of the photomultiplier-tube readout system for the CTA large size telescope

FOR THE CTA CONSORTIUM

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    We have developed a prototype of the photomultiplier tube (PMT) readout system for the Cherenkov Telescope Array (CTA) Large Size Telescope (LST). Two thousand PMTs along with their readout systems are arranged on the focal plane of each telescope, with one readout system per 7-PMT cluster. The Cherenkov light pulses generated by the air showers are detected by the PMTs and amplified in a compact, low noise and wide dynamic range gain block. The output of this block is then digitized at a sampling rate of the order of GHz using the Domino Ring Sampler DRS4, an analog memory ASIC developed at Paul Scherrer Institute. The sampler has 1,024 capacitors per channel and four channels are cascaded for increased depth. After a trigger is generated in the system, the charges stored in the capacitors are digitized by an external slow sampling ADC and then transmitted via Gigabit Ethernet. An onboard FPGA controls the DRS4, trigger threshold, and Ethernet transfer. In addition, the control and monitoring of the Cockcroft-Walton circuit that provides high voltage for the 7-PMT cluster are performed by the same FPGA. A prototype named Dragon has been developed that has successfully sampled PMT signals at a rate of 2 GHz, and generated single photoelectron spectra.

    Original languageEnglish
    Title of host publicationProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
    PublisherSociedade Brasileira de Fisica
    Volume2013-October
    ISBN (Electronic)9788589064293
    Publication statusPublished - 2013 Jan 1
    Event33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
    Duration: 2013 Jul 22013 Jul 9

    Other

    Other33rd International Cosmic Rays Conference, ICRC 2013
    CountryBrazil
    CityRio de Janeiro
    Period13/7/213/7/9

    Keywords

    • Electronics
    • Gamma-rays
    • Imaging Atmospheric Cherenkov Telescope

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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  • Cite this

    FOR THE CTA CONSORTIUM (2013). Development of the photomultiplier-tube readout system for the CTA large size telescope. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 (Vol. 2013-October). Sociedade Brasileira de Fisica.