[Halld-pid] Time-of-Flight Meeting Minutes, July 3, 2014

[Mark Ito]

Folks,

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_3,_2014#Minutes 
.

   -- Mark
________________________________

GlueX TOF Meeting, July 3, 2014
Minutes

    Present:
      * FSU: Sasha Ostrovidov, Aristeidis Tsaris
      * JLab: Hussein Al Ghoul, Mark Ito (chair), Sasha Somov

Trigger and Data Acquisition

    Sascha S. and Hussein gave us a report.
      * The trigger output from each board was checked: flash-to-CTP route
        is working.
      * Thresholds [?] were checked for all channels.
      * All PMTs were set at 1250 V, on the conservative side.
      * A pedestal calibration was done on the flashes and the DACs were
        set to give a pedestals of 200 counts.
      * Pedestals widths are good, about 1.3 counts rms.
      * Two trigger methods were tested:
          1. instantaneous energy (single-sample ADC count over threshold)
          2. integrated energy over an 80 ns window (20 samples)
      * There were some initial problems with the CAEN TDCs that had to be
        worked through.
      * Data was written to disk with both flash and TDC data with the TOF
        trigger.
      * A stand-alone analyzer was written to create ROOT trees directly
        from the EVIO data.
      * Sascha showed an event (run tof_106.0, event 1)

      * [17]Tof view.png
      * Up
      * Down
      * North
      * South

    The first figure is a graphical representation showing one counter hit
    in the vertical plane and two hit in the horizontal. The next four
    figures show the flash data from each channel of each of the four ends
    of the detectors (up, down, north, and south). In particular the two
    horizontal counters show the expected coincidence in time and
    similarity in amplitude.
      * The trigger rate was about 200 kHz.
      * There is one bad splitter and one bad cable in the system at
        present. Chris Stanislav will make the replacement.

    Sascha S. will turn will talk to Hussein later today to start turning
    over the data acquisition to the FSU team. Aristeidis developed an
    independent viewer and had started looking at the data. Paul Eugenio is
    working on getting scaler information going, as a monitor on light
    leaks among other things.

    Now that the DAQ is working at some level there is a huge list of
    commissioning issues that can be addressed. We decided to try and have
    a meeting on Monday to make a list and assign priorities. Mark will try
    to set this up.

BlueJeans Meeting Number

    Mark has booked a new meeting in BlueJeans for these bi-weekly
    meetings. This is only to give him a bit more direct control of meeting
    details. The new meeting ID is 350531998. The [18]BlueJeans meeting
    page has been updated.

Additional Plots

    [19]Neg1.jpg

    [20]Neg2.jpg

    [21]Neg3.jpg

    [22]Neg3.jpg

References

   17. https://halldweb1.jlab.org/wiki/index.php/File:Tof_view.png
   18. 
https://halldweb1.jlab.org/wiki/index.php/Connect_to_Bluejeans_Meetings
   19. https://halldweb1.jlab.org/wiki/index.php/File:Neg1.jpg
   20. https://halldweb1.jlab.org/wiki/index.php/File:Neg2.jpg
   21. https://halldweb1.jlab.org/wiki/index.php/File:Neg3.jpg
   22. https://halldweb1.jlab.org/wiki/index.php/File:Neg3.jpg

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