BLTWG Meeting 08/03/2022

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
   • Explanation for the marked improvement in beam stability at the collimator?
   • Next steps toward a 1cm x 1cm beam spot raster at the photon collimator?
3. Issues related to the CPP run
   • updated values for the x and y electron beam emittances -- Yves
   • use of the new 2D beam convergence tool -- Richard
     • can we improve the peak fits in the harp scan gui?
   • use of the new diamond positioning tool -- Richard
   • calibration of the active collimator distance scale -- discussion
   • other issues? -- anyone?
4. Polarimetry
   • TPOL polarimetry update -- Michael
   • polarimetry from pair production -- Andrew
   • polarimetry from hadron decays -- Alexander A.
     • rho decay polarization in CPP (5.2-5.7GeV)
   • quick check using CBSA (enhancement) -- 'discussion
5. Photon beam simulations
   • active collimator simulations -- Richard
6. TAC run for CPP -- Sasha
7. PS and tagger calibration -- Sasha
8. Luminosity determination for PrimEx --Sasha
9. Photon beam systematics writeup -- Richard
10. Diamond radiators
    • recent progress in radiator fabrication -- Richard
    • update on radiator assessment with X-rays -- Richard
11. Preparation for the PrimEx run in August
    • Moving TAGM to the nominal position
    • Repair TAGH counters
12. Any other business