[Halld-trigger] High Intensity Review prep. minutes

David Lawrence davidl at jlab.org
Thu Apr 13 16:44:08 EDT 2017

Hi All,

  Minutes from this afternoon’s meeting have been posted:

https://halldweb.jlab.org/wiki/index.php/GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017 <https://halldweb.jlab.org/wiki/index.php/GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017>

Minutes[edit <https://halldweb.jlab.org/wiki/index.php?title=GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017&action=edit&section=6>]

Attendees: Simon T., Elton S., Alex S., Dave A., Sergey F., David L.
Summary of final report from last July's L3 "mini-review" presented
Current status of DAQ parameters (as understood by David) was presented
DAQ event rate is currently limited by (according to Alex S.):
95kHz readout rate tested and should be used as one limiting parameter
L1 trigger goal according to Alex is 70kHz-80kHz
Currently unknown when accidentals become enough of an issue that increasing beam current does not gain us anything
This includes L1 rate reduction due to including ST in trigger. This sparked some discussion.
Current data rate estimates are up at or just over 2GB/s without ST. Closer to 1.5GB/s with ST
Two high intensity data sets were taken in Fall 2016. None were taken in Spring 2017./
Conversion from beam current to photon beam intensity on target not fully understood in David'd analysis
Alex described how he used PS rates and gets consistent results between Fall 2016 and Spring 2017 data
Transmission improved by roughly 20% since the Fall
We will meet again next week and weekly until the review
Action Items:
Clarify beam intensity for Fall 2016 high intensity data sets and correlate to Spring 2017 conditions using PS (David)
Estimate data volume and compare to what was previously provided to CC and use to estimate additional tape and hardware cost (David)
Reinstall reprogrammed TD board in Hall (Alex)
Continue testing of dual stream writing at high rate (Dave A., Sergey F.)

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