Real Gamma GDH Experiment (REGGE)

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Revision as of 15:21, 19 March 2020 by Deurpam (Talk | contribs) (Misc. Tasks and questions)

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GDH wiki page

To connect from the outside by phone please do the following

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/433542984
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 433542984
  3. To join via phone, use one of the following numbers and the Conference ID: 433542984
  4. There is no moderator code


Dial Either +1 408 740 7256 or +1 888 240 2560 for US or Canada

Minutes of meeting

09/17/2019

10/09/2019

10/23/2019

11/13/2019

11/27/2019

Documents

Misc. Tasks and questions

  • Look into the figure of merit of the experiment in the low energy, where the photon beam polarization is low. (To see if constructing an additional tagger is justified). (A. Deur)
  • How do we deal, target-wise, with solenoid ramp-down? (rare but possible. Note: Once the target is polarized, we do not need a high field for it. However, high field is still needed for the FDC, which are necessary

to reconstruct the photon energy/the vertex).

  • Do we want a separate solenoid to polarize the target and perform spin flip?
    • Eugene does not feel conformable going above the current operating value of the solenoid (1.8T at the nominal target position, 2T max) and pushing the field would gain only 10%
    • Target RF equipment needs to have a frequency adapted to the field. 2.5T and 5T are good values (not 2T or 1.8T).
    • It seems a better option to have a secondary magnet for polarization and spin flip.
    • Upgrade of the PS so that we cover the low γ flux? see these minutes
  • How well can we check beam charge asymmetry with BPMs?
  • Effect of a beam position-helicity correlation on the data. (M. Dalton)
  • MC simulation:
    • Produce background and main event rates.
    • What trigger(s) to use and what would be its efficiency?
    • Should a beam hardener be used?
    • Check rates quoted in the proposal (once we decide on beam hardener. Presently, the rates are estimated with a 1 MeV cutoff on the photon flux distribution.
    • Determine detection efficiency vs photon energy.
    • Optimize experimental setup
  • Update proposal with: (A. Deur)
    • Add to the list of authors
    • Updated theoretical justifications
    • MC Simulation and set-up optimization
    • Discussion about flipping target spin and beam 1/2-wave plate, see these minutes