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42/R-016 (CERN)

42/R-016

CERN

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  • General

    • What readout capabilities have already been demonstrated?

    • What readout capabilities are currently assumed?

  • Processing and triggering capabilities

    • Can the sub-detector process all 50 MHz of incident beam crossings, and identify whether something of interest has taken place in that beam crossing?

    • If the sub-detector can process all 50 MHz of incident beam crossings, can it also issue a single-subdetector trigger based on that information?

    • If the sub-detector cannot process all 50 MHz of beam crossings, can it be externally triggered at the actual collision rate of O(200 kHz) to process its own data to identify whether something of interest has taken place?  This would represent an externally-triggered sub-detector capable of performing a second-pass trigger, if needed.

    • If the sub-detector cannot process the O(200 kHz) of events following an external trigger, can it accept any external triggers, and if so at what rate?  These would be externally-triggered sub-detectors that can only be active for a subset of collisions in case of further trigger requirements, and which may be relevant for some FCC running modes.

  • Readout capabilities

    • Is the sub-detector capable of reading out based on self-triggering at a 50 MHz rate?

    • If not, is the sub-detector capable of reading out based on external triggers at a O(200 kHz) rate?

    • If not, at what rate can the sub-detector be read out?

    • Will the sub-detector perform a full readout or a regional readout?

  • Readout assumptions

    • Do you make any specific assumptions about how sub-detector readout will be performed?

    • For tracking sub-detectors: does the considered material budget already include readout-related material?

  • Readout volume

    • What is the sub-detector occupancy for each of the signal/background/beam processes in each FCC running mode?

    • What is the number of channels in the sub-detector, and the typical data size per channel?

    • For the sub-detector, is it safe to assume at first order that the data volume is the (occupancy) x (number of channels) x (data size/channel), or are there particularities to be taken into account?

  • Detector occupancy

    • How is occupancy defined for the sub-detector?  The total number of channels with any contribution, the number of channels above some threshold, or something else?

    • If the occupancy includes some threshold, how is the threshold defined?

    • If the occupancy includes some threshold, what fraction of channels containing signal contributions will be below that threshold?

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