[Halld-pid] Time-of-Flight Meeting Minutes, August 12, 2020

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_12,_2020#Minutes> 
and below.

   -- Mark


    GlueX TOF Meeting, August 12, 2020, Minutes

Present: Edmundo Barriga, Eugene Chudakov, Mark Ito (chair), Sasha 
Ostrovidov, Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/e815xHbl3mo/> on the BlueJeans site. Use your 
JLab credentials to gain access.


      Review of minutes from the last meeting

We went over the minutes from July 29 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_29,_2020#Minutes>. 
Beni reported that the hot channel in the ADC scalers was some sort of 
DAQ glitch; it has since calmed down.


      Calibration Anomaly

Sean Dobbs alerted Beni to a problem with the calibration from the first 
part of the current run (pre-COVID interruption) for paddle 18. The 
bottom PMT of this paddle, PMT #63, has an anomalous time-walk behavior 
(time difference between TDC and ADC vs. ADC amplitude). See Beni's 
plots below. The top plot is from run 71838 where the ADC was bad, the 
bottom from 71833, before the problem appeared. Note also that in the 
top plot the y-values have had their signs flipped artificially; the 
difference from nominal is much starker than the plot suggests on its 
face. This degraded the calibration of the paddle. Unfortunately, this 
problem, which was fixed by changing the FADC, persisted for a 
not-insignificant number of runs and has to be dealt with. Beni is 
looking into a fix.

Pmt63 run71838.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Pmt63_run71838.gif>

Pmt63 run71833.gif 
<https://halldweb.jlab.org/wiki/index.php/File:Pmt63_run71833.gif>


      TOF NIM paper

We re-dedicated ourselves to the effort.


      Action Item Recap

 1. Decide on when to ship PMTs to JLab from FSU (Mark, Paul Eugenio)
 2. Prepare a complete draft of the TOF NIM paper. (all)
 3. Paddle 18 re-calibration (Beni)

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  * This page was last modified on 12 August 2020, at 15:47.

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