View source for PREX/CREX Thursday, September 18, 2014 9:30am EDT

Link to the Meeting page [[PREX/CREX Teleconferences]] <br/>
Last meeting: [[PREX/CREX Thursday, September 11, 2014 9:30am EDT]]

 The teleconference info is as follows:

        Phone #: +1-888-240-2560 or +1-408-740-7256 and [http://bluejeans.com/numbers See International Numbers]
        Code: 174599135

== Agenda ==
* Updates from Rakitha : Site Boundary Neutron (and other) Radiation : Initial Results [http://ace.phys.virginia.edu/HAPPEX/2954 elog-2954]
* Updates from Nickie : G4MC, x versus p, y versus theta [http://ace.phys.virginia.edu/HAPPEX/2955 elog-2955]
<br/>
Present:<br/>
Rakitha, Nickie, Tyler, Bob, Guido, Kent, Dustin, Paul, Seamus

== Minutes ==
* Discussion on site boundary neutron radiation elog 2954
* The main improvement for the neutron is coming from the collimator itself. Since we made the collimator transversely big, it blocks EM (High Z) and slows down neutrons. 
** Collimator is the main source as well as good moderator/blocker
* The asymmetry in forward back comes due to more high Z materials in forward direction compared the backward in our simulation

* We can estimate what is going to top by rotating the either side -> top/bottom is same as sides by symmetry?

* Update Pavel with this results and discuss about further simulation that he wants to do
** Coordinate with Alan and Pavel to get the correct geometry ported to Radconn simulation
** Discuss about the activation of collimator and scattering chamber area. 
** Al vs stainless steel for the scattering chamber attachment -> Lorenzo did simulation work looking at this.
	
* On side note : Geant4 seems to overestimate the neutrons at high energies (E> 10 MeV) compared to Fluka and MCNPX


* Discussion on PREX/CREX optics	 elog 2955
** Nickie is doing G4MC calibration/benchmark simulation tests 

** Next step is to have realistic septum field for this simulation -> scaled up AMC field?


* Discussing outstanding issues
**  Check old discussions for engineering issues related to scattering chamber and attachment 
**  Collaboration meeting possibly on 3rd week on November and plan for the readiness review on December
**  Dustin currently planning to put a natural calcium target in the beam
**  Spectrometer Q1 new collimation design currently Bob is working with Pavlo on this

<br/>

== Misc.==
* Beam parasitic studies needs a to-do list

=== TO DO Lists ===
* We need to have an estimate of how much coulombs used for PREX-I data and an estimate for PREX-II to determine effectively how much more beam time we will use.
* Have a optic calibration run plan (discussed in 01/16/2014 meeting)
* It would be nice to have real-time viewer for optics studies in commissioning (disussed in 01/16/2014 meeting)

<br> TO DO Lists link: [http://hallaweb.jlab.org/parity/prex/todo_prexII.html PREX], [http://hallaweb.jlab.org/parity/prex/todo_c-rex.html CREX]
<br>