PREX/CREX Monday, March 16, 2015 3:00pm EDT

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Link to the Meeting page PREX/CREX Teleconferences
Last meeting: PREX/CREX Monday, March 9, 2015 3:00pm EDT

The teleconference info is as follows:
       Phone #: +1-888-240-2560 or +1-408-740-7256 and See International Numbers
       Code: 174599135


Updated from Nickie : theta, and theta versus p at PREX focal plane, DATA elog 2970

Bob, Seamus, Yuxiang, Ciprian, KK, Nickie, Paul, Kent



  • Nickie's elog 2970 shows angular distribution at the VDC plane for PREX-I data, He will make a follow up post with detector plane angular distribution
    • It would be nice to see the angular distribution with respect to central angle (45 deg.) at the detector plane.
  • This angular distribution is important to look at as current PREX-II detector design-3 is more sensitive to the angular distribution
  • We also have to consider about the transverse asymmetry effects on the detector plane.
  • The angular distribution and transverse effect needs to be understood with new quard replacements in HRS
  • In PREX-I we empirically understood the transverse contribution using a detector placed at a region sensitive to transverse contribution
  • Engineering update from Kent,
    • Now engineering efforts are focused to APEX and SBS and now is a good time to address some of issues requiring engineering time,
    • This include,
      • How to insert the collimators, transversely or horizontally. Our original idea was to insert it from top. see minutes on Minutes
      • Rolf's idea of using a new narrow (long) scattering chamber
  • Using a new narrow (long) scattering chamber would require two target ladder systems for PREX and CREX
    • Bob and Kent will post elogs with showing a crude design diagram
    • Bob will talk to Dave Meekins and Siviu about the new scattering chamber
    • We would like to have a solidworks (CAD) drawing for this proposed scattering chamber design
      • Talk to Dustin about making a design using his or his student's CAD skills
    • We have to come up with list of upgrades (new purchases or new designs) that will be required by this new scattering chamber design
    • How to deal with optics targets and water cell target?
  • We will not need long scattering chamber design for CREX as Dave Meekins have a way to keep Ca target isolated without elongated windows. see minutes on Minutes


  • Beam parasitic studies needs a to-do list

TO DO Lists

  • It would be nice to have real-time viewer for optics studies in commissioning (disussed in 01/16/2014 meeting)

TO DO Lists link: PREX, CREX