PQB Meeting April 30, 2015

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We will meet in TL 2236 Thursday April 30 at 1:00 pm EST.

For those calling in we'll use the Blue Jeans [1] audio conference system.

Phone number: 1-888-240-2560
Meeting ID: 3528502673#
Meeting URL: http://bluejeans.com/3528502673


  1. Roger Carlini: Hall A Beamline Modifications: media:PQB_HallATasks.txt
  2. Yves Roblin: Synchrotron radiation and CEBAF Beam at 11 GeV

Notes from this meeting:

  • Due to conflict with QWeak Collaboration meeting on Thursday May 28, our next meeting will be on Thursday June 4, 2015.
  • Roger, Kent and Mark Pitt will present a complete list of changes to Hall Beamline at our next meeting.
  • Additions to Roger's list:
  1. Revive Hall A parity DAQ
  2. Revive Injector parity DAQ and add additional ADCs for laser QPD and one BPM
  3. Re-install helicity magnets at injector beamline - Yves will help identify locations to cover phase space
  4. Injector Aperture currents to parity DAQ:
    1. First, a beam test where the currents are sent directly to parity DAQ
    2. If needed, come up with a conceptual design on how to share the currents between accelerator picoammeters and parity DAQ
  5. Synchrotron Radiation discussion:
    1. Yves will implement an ELEGANT model to calculate spin precision with synchrotron radiation included
    2. Depolarization due to spin-flip synchrotron radiation (Sokolov–Ternov effect) is very small
    3. Does emittance growth depend on helicity?
    4. Does energy spread (or tail) depend on helicity?
  • A Spin-Light Polarimeter for Multi-GeV Longitudinally Polarized Electron Beams.

P. Mohanmurthy and D. Dutta, IEEE TRANSACTIONS ON NUCLEAR SCIENCE 61, 528 (2014) [2] media:IEEE.61.528.pdf