[Halld-pid] Start Counter Meeting Minutes, September 22, 2016

[Mark Ito]

Colleagues,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_September_22,_2016#Minutes 
.

You will want to go the wiki and click on the plots to be able to see 
anything.

   -- Mark

______________


    GlueX Start Counter Meeting, September 22, 2016, Minutes

Present:

  * *FIU*: Mahmoud Kamel
  * *JLab*: Thomas Britton, Mark Ito (chair)

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


      Review of minutes from the last meeting

We went over the minutes from the meeting on August 26 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_August_26,_2016#Minutes>. 


Sean Dobbs contacted about the monitoring and calibration plugins. 
Mahmoud needs the new-data-format-capable branch from David to look at 
the ADCs. He also needs new-format data to test changes.

Mahmoud is working on Python scripts to do calibration automatically, as 
Werner suggested last time.


      Run Readiness

Mark, Eric Pooser, Tom Carstens, and Stephanie Worthington cabled up the 
start counter yesterday. The strain relief was not fully hooked up. 
Today they will do a test insertion and survey. The plan is to pull the 
target/start counter again and fully apply the strain relief on the cables.

The next step after that is to take some data and confirm the cables are 
connected properly.


      Start Counter Efficiency

Mahmoud showed some slides on start counter efficiency. Captions are for:

 1. top left
 2. top right
 3. bottom left
 4. bottom right

SCHits.png <https://halldweb.jlab.org/wiki/index.php/File:SCHits.png>

 1. raw number of hits
 2. difference between track projection and center of counter
 3. time difference between prediction from track and start counter time
 4. 2-D plot of the previous two

EFF.png <https://halldweb.jlab.org/wiki/index.php/File:EFF.png>

 1. number of start counter hits (same as above)
 2. same after cuts on delta t (2.5 ns) and delta phi (18 degrees)
 3. ratio of the two

Projected SCHits.png 
<https://halldweb.jlab.org/wiki/index.php/File:Projected_SCHits.png>

 1. number of time a track projects to a counter
 2. number of start counter hits in the sector with cuts mentioned above
 3. z distribution of track projections
 4. track vertex z vs. z dist. of track projections

This was work in progress. We spent quite a while on a nice discussion 
of basic approaches to calculating efficiencies. See the recording for 
details.


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