Difference between revisions of "High Intensity Running"

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(Near-term Questions)
(Near-term Questions)
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# L1 trigger  
 
# L1 trigger  
#* What is a reasonable ratio of various trigger types at high intensity?  
+
## What is a reasonable ratio of various trigger types at high intensity?
#* 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 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 of the 2016 Spring run?
+
## What is the relative drop of the trigger efficiency for a twice more stringent FCAL+BCAL trigger, which would leave 50% of the events of the 2016 Spring run?
#* Would a ST*(FCAL+BCAL), or other coincidence help to reduce the trigger rate minimizing the efficiency loss?  
+
## Would a ST*(FCAL+BCAL), or other coincidence help to reduce the trigger rate minimizing the efficiency loss?  
 
# DAQ
 
# DAQ
 +
## How do the event sizes scale with the beam intensity (for the triggers used)?
 
## What are the expected data rates for each crate?
 
## What are the expected data rates for each crate?
##* How do the rates scale with beam intensity?
+
##* How do the data rates scale with beam intensity?
 
##* Can we reduce the data read from each crate by dropping headers or reformatting? (e.g. fADC125 Trigger Times)
 
##* Can we reduce the data read from each crate by dropping headers or reformatting? (e.g. fADC125 Trigger Times)
 
##* Can we reduce the data read from each crate by reducing readout windows?
 
##* Can we reduce the data read from each crate by reducing readout windows?

Revision as of 18:50, 29 July 2016

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
    1. What is a reasonable ratio of various trigger types at high intensity?
    2. 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.
    3. What is the relative drop of the trigger efficiency for a twice more stringent FCAL+BCAL trigger, which would leave 50% of the events of the 2016 Spring run?
    4. Would a ST*(FCAL+BCAL), or other coincidence help to reduce the trigger rate minimizing the efficiency loss?
  2. DAQ
    1. How do the event sizes scale with the beam intensity (for the triggers used)?
    2. What are the expected data rates for each crate?
      • How do the data rates scale with beam intensity?
      • Can we reduce the data read from each crate by dropping headers or reformatting? (e.g. fADC125 Trigger Times)
      • 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?
    3. What is the real limit on the VME data transfer speed considering the bus clocks and the duty cycles provided by various modules?
    4. What crates (FDC?) would limit the DAQ capabilities at the VME transfer level?
    5. What crates would limit the DAQ capabilities at the Ethernet level? What gain a 10 Gb interface would provide?
  3. L3
    1. What would be the largest reduction factor at "high intensity" (long events), if no time limit is considered?
    2. How many nodes are needed for a reduction factors of 4 at a 100 kHz event rate?