[Halld-pid] Start Counter Meeting Minutes, November 13, 2014

[Mark Ito]

Friends,

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014 
.

   -- Mark
___________________________


GlueX Start Counter Meeting, November 13, 2014
Minutes

Present:

  * *FIU*: Werner Boeglin
  * *JLab*: Fernando Barbosa, Mark Ito, Eric Pooser, Beni Zihlmann


Start Counter Tilt

Eric sent an email to Tim Whitlatch asking for survey results. He 
recalls that the nose was tilted about 1.0-1.5 mm down. This was seen on 
the assembly jig at FIU. The ST was surveyed on the target cart in the 
hall. We are seeing higher rates at the top than the bottom of the 
array, by a factor of 2.5.
This could be corrected in various ways, but for the current run we 
agreed it was best to leave well enough alone. The start counter will be 
mounted on the hydrogen target cart for the Spring run; we should try to 
correct this tilt when it is mounted on that cart.

TDC Timing

We noted the need for a trigger signal somewhere in the F1-TDC system. 
Beni reported that he has installed one in the FDC TDC crate. That 
should allow us to correlation times in the start counter with the rest 
of the detector.

Monitoring Histograms and More

Eric showed the plots he presented 
<http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2605> 
at Wednesday's Run Coordination Meeting. Things are looking good. In 
particular he sees a good correlation between start counter times and 
BCAL times as measured by the FADC-250s.

Retrieved from 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_13,_2014"

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

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