High Intensity Running

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Revision as of 10:54, 29 July 2016 by Gen (Talk | contribs) (Overview)

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Overview

This page gathers information related to high intensity (5 x 107 γ/s - 50 MHz in 8.4-9.0 GeV) GlueX running.

Reference Material

Planning

Near-term Questions

Here is a place to gather some questions that need to be answered in order to properly plan for high intensity running.

  1. L1 trigger
    • What is the L1 trigger rate expected for the 50 MHz beam, extrapolating the Spring 2016 conditions: the FCAL+BCAL trigger? other triggers? The accidentals should be considered.
    • What is the relative drop of the trigger efficiency for a twice more stringent FCAL+BCAL trigger, which would leave 50% of the events?
    • Would a ST*(FCAL+BCAL), or other coincidence help to reduce the trigger rate minimizing the efficiency loss?
  2. DAQ
    • What are the expected data rates for each crate?
      1. How do the rates scale with beam intensity?
      2. Can we reduce the data read from each crate by dropping headers or reformatting? (e.g. fADC125 Trigger Times)
      3. Can we reduce the data read from each crate by reducing readout windows?
      4. What crates (FDC?) would limit the DAQ capabilities after the data reduction (items 2-3)?
  3. What fraction of events will be reconstructable/usable?
  4. Can we reduce the data read from each crate by dropping headers or reformatting? (e.g. fADC125 Trigger Times)
  5. Can we reduce the data read from each crate by reducing readout windows?
    • Do the tagger data rates really drop below the FDC when the windows are reduced?