BLTWG Meeting 3/13/2017

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  • Time: 11:30 EDT
  • Connecting: detailed instructions are here
  • Conference id: 536076821
  • Present: Hovanes E., Alexandre D., Eugene C., Richard J., Michael D., Dan S., Brendan P., Nathan S., Tim W., and Sascha S.


  1. Announcements
  2. Photon beam issues encountered during this run - discussion
  3. Photon beam properties
    • harp scans
    • beam energy monitoring
    • beam current and position
    • beam normalization from TAC run
    • beam polarization with TPOL
  4. Options for reducing photon beam flux during TAC runs - discussion
    1. reducing beam current below 10nA (requires work by accelerator experts)
    2. thinner radiators (wires, carbon fibers, nanofoils)
    3. pin-hole collimator insert (MC study of collimator halo)
    4. systematics associated with each of the above
  5. Study of PARA/PERP polarization offset from beam-collimator misalignment - Richard J.
  6. Photon beam-related program @ 6 GeV, if we can get it - discussion
    • TAC run systematics studies
    • align, take data with 20 micron diamond
    • fast raster for active collimator calibration, beam spectrum profiling
  7. TPOL upgrade
  8. Update on TAGH calibrations - Nathan S.
  9. Update on TAGM calibrations - Alex B.
  10. Update on PS calibrations - Sascha S.
  11. Any other business