[Halld-pid] Time-of-Flight Meeting Minutes, June 27, 2017

[Mark Ito]

Please find the minutes below and on the wiki at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_June_27,_2017#Minutes 
.

______________


    Minutes

Present:

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

There is a recording of this meeting <https://bluejeans.com/s/QyWwK/> on 
the BlueJeans site.


      Event Viewer

Thomas announced that the 3-D event viewer project is moving ahead and 
encouraged us to think about how we would like to have the TOF 
represented visually.


      New Timewalk Correction

  * Beni checked one run with the new correction. There was a problem
    with the reference paddle, but other than that the correction does
    as well as the previous scheme.
  * If further checks look good, he will do a full re-calibration of the
    Spring 2017 data.
  * The new scheme requires new tables to be loaded in the CCDB.


      Energy Calibration

  * Brad has succeed in fitting peaks starting from Beni's ROOT file.
  * He has also started the Monte Carlo needed to interpret the energy
    in the peaks.
  * He is running into a ROOT, issue: the code crashes. He is tracking
    it down.
  * There is one paddle with a MIP at 9000 counts in the integral.
    Nominal is half that. Some of the outer counters did have higher
    gain. He is studying whether we need to lower the HV on this counter.


      TOF Efficiency Studies

  * Beni has started looking at TOF efficiency as a function of x-y over
    the face of the TOF.
  * For charged track that point to the TOF, he checks for a
    corresponding TOF point.
  * He only starts to see efficiency problems for tracks with momentum
    less than 1 GeV/c.


      PMT Testing

Sasha reports that they have recruited students to do the testing at 
FSU. They are currently struggling with a non-cooperative Lecroy HV 
mainframe.


      NIM Paper

Beni relayed Elton Smith's suggestion that we put the NIM paper into the 
GlueX Document Git repository at 
https://github.com/JeffersonLab/gluex_documents .

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

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