[Halld-pid] Time-of-Flight Meeting Minutes, December 6, 2017

[Mark Ito]

Folks,

Please find the minutes of our brief meeting below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_December_6,_2017#Minutes 
.

   -- Mark

__________________________


    GlueX TOF Meeting, December 6, 2017, Minutes

Present:

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

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


      Announcements

Beni complete the Hot Check-Out for the TOF. We are ready to go.


      PMT Testing

Sascha reported that all 25 PMTs have gone through single photo-electron 
testing. He showed some plots of results for selected tubes 
<http://hadron.physics.fsu.edu/%7Eostrov/tof/20171206/>. The calculated 
gains track those supplied by Hamamatsu, but the amount of variation 
from the Hamamatsu number is about 25%. In the original batch of TOF 
PMTs, the variation was more like 10%. There is also a (previously 
noted) large variation in the yield of single-pe events from tube to tube.

The tubes will now go on to tests with an americium source.

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20171206/acafc3c4/attachment.html>