[Halld-pid] Time-of-Flight Meeting Minutes, November 17, 2015

[Mark Ito]

Flighters,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_17,_2015#Minutes 
.

   -- Mark
____________________________________________


  GlueX TOF Meeting, November 17, 2015, Minutes

Present:

  * *FSU*: Hussein Al Ghoul, Brad Cannon, Sasha Ostrovidov, Aristeidis
    Tsaris
  * *JLab*: Mark Ito (chair), Simon Taylor, Beni Zihlmann

There isrecording <https://bluejeans.com/s/8OSM/>of this meeting 
available on the BlueJeans site.


      New TOF scaler GUI

Paul Mattione has created anew TOF scaler GUI 
<https://logbooks.jlab.org/entry/3350719>some months ago. Sasha 
commented that he used it to discover the bad FADC mentioned below.


      Review of minutes from November 3

We went over theminutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_3,_2015#Minutes>. 
Sasha has been taking data successfully; ROCTOF1 has not been crashing 
after the bad FADC was found and replaced.

Brad plans to be at the Calibration Meeting tomorrow where 
theCalibration Challenge 
<https://halldweb.jlab.org/wiki/index.php/Calibration_Challenge>will be 
discussed.


      "Random" TDC Calibration Offset

Beni described aproblem with TOF Points 
<https://mailman.jlab.org/pipermail/halld-pid/2015-November/000840.html>that 
he uncovered by looking at the event display. Occasionally he saw hits 
missing in the display when they were present in the raw data. This was 
traced to a difference in how one of our calibration constants was 
obtained versus how it is applied. The scheme to disambiguate the 6-fold 
ambiguity in the CAEN TDCs had different indices for the identification 
of the correct cyclic permutation of the pattern of shifts. One out of 
six events (randomly) would be shifted from nominal. This was resolved 
by changing the constant to agree with what is used in reconstruction. 
This fixes it for the Spring-15 run. The problem remains there in the 
Fall-14 data.


      Calibration Status, FSU

Sasha showed two events:

  * Very rare Good Event
    <http://128.186.19.133/%7Eostrov/tof/20151117/good_event.png>
  * Overwhelming majority of events
    <http://128.186.19.133/%7Eostrov/tof/20151117/common_event.png>

He is having problems making progress with the cosmic calibration since 
the good events only contribute about one part in ten thousand to the 
event sample. He continues to explore different DAQ parameters to try to 
enrich the sample.


      Hot Check-Out

It turns out that Aristeidis and Mark went through the checklist last 
time. Mark will give it a shot this time. This needs to be done by next 
Wednesday.


      Equipment Loan, JLab to FSU

Theloan <https://halldweb.jlab.org/talks/2015/fsu_loan.pdf>is up for 
renewal. Paul Eugenio is aware of the situation.


      NIM Article

Beni talked to Paul about the status of the article. It has been on the 
back burner lately. Beni intends to contribute a section on calibration 
to the draft.

Retrieved from 
"https://halldweb.jlab.org/wiki/index.php?title=GlueX_TOF_Meeting,_November_17,_2015&oldid=71436"

  * This page was last modified on 17 November 2015, at 15:17.


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