[Halld-pid] Start Counter Meeting Minutes, December 12, 2014

[Mark M. Ito]

Folks,

Please find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2014#Minutes

   -- Mark
_________________________________________


GlueX Start Counter Meeting, December 12, 2014, Minutes

Present:

  * *FIU*: Werner Boeglin, Mahmoud Kamel, Eric Pooser
  * *JLab*: Mark Ito, Beni Zihlmann


Online Monitoring Histograms

Eric has been looking at the histograms to check status of the start 
counter. He has some suggestions for histograms that should be pulled 
out and put into the "highlights" list for the online monitoring 
browser. He will send Justin an email with the list.

Start Counter Studies

Eric presented some slides 
<https://halldweb1.jlab.org/talks/2014-4Q/ST_Update_Dec_12_2014.pdf> on 
recent work to understand the data we are getting from the start 
counter. We had extensive discussion on each slide. The main themes were:

  * *Timing*. Now that he is using the reference signal to the F1-TDCs,
    reasonable timing results were shown.
  * *Tracking Projections*. The intersection points of charged tracks
    and the start counter are generally sensible, but in detail present
    many anomalies.


Calibration

We identified the front-burner issues:

  * better understanding of charged track projections
  * counter-by-counter time offsets


Precision on the latter will depend on the former.

The Sector 2 Blues

Eric has noted consistently lower rates in sector 2 compared to the 
others going back to the early days of the run. The raw ADC and TDC 
spectra and occupancy do not explain it. More investigation is needed.

Retrieved from 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_December_12,_2014"

-- 
Mark M. Ito, Jefferson Lab, marki at jlab.org, (757)269-5295

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