View source for Π polarizability Meeting Feb 28, 2018

=Meeting Info.=
== Meeting Time And Location ==
10:00 EST (JLab time)

''David's Office''

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David: (757) 269-5567  (cell: 757-746-6697)
Rory: (413) 545-2480
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== Agenda ==

# Previous meeting: [[&pi; polarizability Meeting Feb 14, 2018|Feb 14, 2018]]
# Announcements
# Spring 2018 run
#* Muon chamber beam test
#* [https://logbooks.jlab.org/book/hdfmwpc HDFMWPC Log Book]
# Other business
<!--
#* FCAL response to hadrons
#** [[&pi; polarizability Meeting Feb 7, 2013|CPP Meeting Feb 7, 2013]] (David's 2013 presentation)
#** [[&pi; polarizability Meeting May 16, 2013|CPP Meeting May 16, 2013]] (Lubomir's 2013 plots)
#** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=2184 GlueX Physics Meeting Mar 25, 2013 : Measured response of the Radphi lead glass FCal to high energy charged pions]  
 (Richard Jones)
-->
# Next meeting

=Minutes=
Attending: Ilya Larin, David Lawrence

Below is an e-mail I sent out summarizing this meeting.

 Hi All,
 
 Today turned out to not be a great day for most people to meet. It ended up being
 just Ilya and I. We did have a discussion on what we would like to do with the chamber
 and any remaining beam opportunity. Here are the ideas we came up with so others
 may comment:
 
 1. Change the gas mixture to 90/10. We have not yet spoken with Tom/Scot on how
 difficult this is. We will do that this week.
 
 2. Change the scintillator paddle position to be closer to the beam line.
 
 3. Machine a hole in the 10.75” steel plate and center it on the beam line. This will
 give a much closer approximation of beam conditions. The hole should be round with
 a diameter between 6.6cm and 8cm. According to my notes, the dead region in this
 chamber is 3.4” in diameter (=8.64 cm). Studies from last year set the beam hole
 size to 2cm smaller in diameter compared to the dead region so if we follow that,
 the hole size should be ~6.6 cm. The final design parameter for the dead region from
 those same studies was 10 cm with a beam hole of 8cm diameter. 
 
 One option is to try and do both by cutting the smaller hole, taking data, and then cutting
 the larger hole. Alternatively, we could cut the larger hole and then make a plug or mask
 to get data with the smaller hole size.
  
 The chamber is currently out of the beam. There may be opportunity on Monday to 
 reinstall it along with any of these modifications. There is also a possibility they will 
 extend the run for one more week.
 
 Rory and Elton: please think about this and let us know what you think and if there are
 any other things you would like to do during the remainder of this run period.
 
 Regards,
 -David