BLTWG Meeting 03/01/2023

Organization

• Time: 3:00 EDT
• JLab meeting room: none
• Connecting: detailed instructions are here
  • web browser: connect using zoomgov
  • phone: 833 568 8864 US Toll-free
• meeting ID: 161 038 5436
• passcode: 097756

Agenda

1. Announcements
2. Accelerator update -- Edith
   • Next steps toward a 1cm x 1cm beam spot raster at the photon collimator?
3. Polarimetry
   • TPOL polarimetry update -- Michael
   • polarimetry from hadron decays -- Alexander A.
     • First results from 2023: [1][2][3]
4. Ongoing tagger work
   • tagger microscope timing recalibration -- Ellie Prather
   • understanding the ratty discriminator rate profile since 2/15/2023 -- Richard Jones
   • vertical electron collimation in the TAGM -- discussion
     • first results from tagged PS yield (Justin)
     • rho yields (8.0-8.6GeV) (Alex)
5. Systematics studies
   • Beam current measurement -- Alexandre, Richard
   • TAC (CCAL) normalization -- Sasha
   • PS and tagger energy calibration -- Richard, Sasha
   • Photon beam systematics report -- Richard
   • Luminosity determination for PrimEx -- Sasha
6. Tests for future running at higher beam intensity
   • tests of different X-ray absorbers - -Justin
   • construction of a prototype beamline X-ray deflector - Richard
7. Diamond radiators
   • plans for the next run at CLS -- Richard
8. Any other business