Fall 2016 High Intensity/L3 beam test

Plan

High Intensity

Goals:

1. Test ability to read out events and build them at high rate
2. Get sample of events taken at various luminosities to allow:
   • mapping of component data rates vs. luminosity
   • testing of L3 algorithms offline using real data occupancies

Issues:

• Single stream over IB limited to 1.5GB/s
• Disk writing limited to ~1GB/sec (depends on block size)

Requires:

• For anticipated data rates we will need multiple streams into SEB.
• To record data using single ER we may need to run ER on same node as SEB
• High rates may require use of EMU sockets between SEB and ER
  • requires modification of CODA configuration
  • preclude EPICS/BOR from datastream, and online monitoring

Detailed plan:

• Take data as close as is possible to 1x10⁸ but with dumping the data at the SEB level.
  • Record event rate, livetime after running for at least 10 minutes.
• Repeat at 80%, 60%, 40%, and 20% beam current
• Repeat above but with writing data to disk (livetimes will likely be very low)

L3

Goals:

1. Test L3 infrastructure using real beam conditions
   • quantify compute resources required sans L3 algorithm
2. Test ability to compress data at ROC level and maintain high rate