[Halld-pid] Start Counter Meeting Minutes, October 20, 2016

[Mark Ito]

Folks,

Here are the minutes from two weeks ago, below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_October_20,_2016#Minutes 
.

   -- Mark

____________________


    GlueX Start Counter Meeting, October 20, 2016, Minutes

Present:

  * *FIU*: Werner Boeglin, Mahmoud Kamel
  * *JLab*: Thomas Britton, Mark Ito (chair), Paul Mattione, Eric
    Pooser, Simon Taylor

There is a recording of this meeting <https://bluejeans.com/s/c7N2c/> on 
the BlueJeans site.


      Announcements

  * There will be no beam until after Thanksgiving. [Added in press:
    beam is now due November 17.]
  * The target has not been pushed into the bore yet.


      Possible start counter hole?

Mahmoud noticed a "feature" of the start counter geometry. He discussed 
this with Sean and the discussion moved to an 
[https://github.com/JeffersonLab/sim-recon/issues/594#issuecomment-254847156 
issue on GitHub]. Please see GitHub for the details and plots of the 
effects. Paul and Mike Staib contributed studies and Simon found and 
fixed the root problem in the algorithm for determining the intersection 
of charged tracks with the start counter.


      Run Readiness

  * The start counter has not been pushed into the bore yet.
  * Sascha Somov told Mark that the problem preventing read-out of the
    TDC crate a couple of weeks ago has been solved. The download of new
    TI firmware in that crate had been interrupted before completion and
    so the TI was unsurprisingly non-functional. The full complement of
    firmware has since been downloaded.
  * Sascha also mentioned he is seeing very occasional corruption of TDC
    data from this crate. It appears on a hour-ish timescale and does
    not affect subsequent events in the run. The cause is unknown at
    present.


      Efficiency

Yesterday, Paul sent Mahmoud a description of how he pictures doing the 
efficiency measurement. We had some significant discussion, but nearly 
all of it had to do with definition of terms (what is a "hit") and the 
cuts used in the efficiency tree that Paul wrote. Paul did note that 
there is a loose timing cut relating the track to the start counter and 
the information for the user to apply a custom cut will be present in a 
future version of the tree.


      NIM/TDR

Eric has started on writing the NIM-article/TCR. In parallel he will put 
together a contribution to the TDR. He plans to use the ShareLaTex 
platform.


      Meeting time change

We decided to move the meetings from 10 am to 11 am. We will keep the 
same day, every two weeks on Thursday.


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