[Halld-pid] Time-of-Flight Meeting Minutes, November 15, 2016

[Mark Ito]

Timers,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_15,_2016#Minutes 
.

   -- Mark

______________________


    GlueX TOF Meeting, November 15, 2016, Minutes


Present:

  * *FSU*: Sasha Ostrovidov
  * *JLab*: Thomas Britton, Brad Cannon, Paul Eugenio, Mark Ito (chair),
    Simon Taylor


      Announcement: New PMTs Have Arrived

The 30 new tubes are here. They are in Mark's office. We will look into 
shipping them to FSU so that they can go through the same acceptance 
tests we used for the tubes used in construction.


      Review of minutes from the previous meeting

We went over minutes from the meeting on October 18 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_18,_2016#Minutes>. 


  * *Timing Test at Reduced Gain*. Sasha will look into doing this at FSU.
  * *Run Readiness*. There are four dead ADC channels in the TOF right
    now. Beni Zihlmann is investigating.
  * Hot Checkout is done for the TOF. Beni took care of it.


      Integral Non-Linearity Calibration of CAEN TDCs

Beni complete his calibration of the INL correction. Among other places, 
he reported results in the e-log 
<https://logbooks.jlab.org/entry/3435583>. Constants have been 
downloaded into the CAEN TDCs and Paul Mattione repeated his RF test 
<https://logbooks.jlab.org/entry/3436009> with much better results.

Beni has also been looking at the feasibility of applying a correction 
to data already taken. The procedure depends on the the constants and 
setting resident of the CAEN before now. He is trying to do a 
calibration using old data to assess the situation, but the results are 
a bit confusing at present. He is consulting with experts in the 
Electronics Group.


      HV Scan Planning

There have been no functional changes in the software since the last 
meeting. Paul Eugenio reminded us that there might be some 
incompatibilities with ROOT 6 remaining.


      Lucite Shield

Paul walked us through his elog entry on the test fit on the front face 
of the TOF <https://logbooks.jlab.org/entry/3437900> and his simple run 
plan <https://logbooks.jlab.org/entry/3438847>. He is looking into how 
much data would be needed to do an FCAL calibration (to assess effects 
on that detector).


      TOF Time Resolution for Charged Tracks

Brad is working on a study. He will aim for presenting results at the 
next meeting.


      Action Items

 1. Fix the 4 dead ADC channels. (Brad)
 2. Look into timing tests at FSU. (Sasha)
 3. Look into shipping PMTs to FSU for testing. (Mark)
 4. Look into a replacement LeCroy 1440 mainframe for FSU. (Mark)


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