[Halld-pid] Start Counter Meeting Minutes, April 20, 2017

[Mark Ito]

Folks,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_April_20,_2017#Minutes 
.

   -- Mark

_________________________


    GlueX Start Counter Meeting, April 20, 2017; Minutes

Present:

  * *FIU*: Mahmoud Kamel
  * *JLab*: Thomas Britton, Mark Ito (chair), Eric Pooser, Simon Taylor,
    Beni Zihlmann

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


      Review minutes from the last meeting

We looked at the minutes from March 23 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_23,_2017#Minutes>. 



        Time-dependent geometry adjustments

Simon has received the latest survey spreadsheet from Tim. The next step 
is to encode the data into an HDDS file. Because of the large shifts we 
are seeing from run to run, Simon will simply create a new global offset 
for each run period. Shifts as large a centimeter seem to occur; it is 
not understood why. The pitch of the counter also seems to change, 
though a systematic study of the shifts has not been done.

Mahmoud has tried out Simon's recent changes to matching of charged 
particles to the start counter. He does not see improvement. Simon 
reports crashes in this part of the code after recent tracking changes 
were checked in. The precise cause is still under investigation.


      NIM/TDR

Eric has a draft of the NIM paper. Currently, the files are stored in 
his private GitHub repository 
<https://github.com/pooser/st-nim-article>. There is a PDF file on the 
site 
<https://github.com/pooser/st-nim-article/blob/master/st_nim_article.pdf>. 
At some point the paper will migrate to the gluex_documents repository 
<https://github.com/JeffersonLab/gluex_documents>.

Eric is getting help with the mechanical drawings from Stephanie 
Worthington. She has translated several of his original drawings into 
her CAD system. Also Mahmoud has agreed to contribute plots illustrating 
the calibration procedure.


      Collaboration Meeting

Mahmoud proposed not having a Start Counter talk this time; not enough 
has changed to justify a dedicated talk. He will provide slides to 
either Sean (calibration) or Paul M. (analysis) for inclusion in one of 
their talks.

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20170420/31ba59b3/attachment.html>