Optics Meeting Jun 13 2023 200PM ET

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  1. [Kate] Table for sieve hole information [1]


David, Kent, Zuhal, Vassu, Tyler, Juliette, Sayak, Paul S., Kate


  • Tyler:
    • He is ready to start implementing average theta values to look at algorithm results.
  • Kate:
    • A spreadsheet with information is created and linked. Everyone with the link should be able to view and edit.
  • Zuhal:
    • The hole tilting is underway. There were initially some issues with the GDML file because the holes were tilted WRT to sieve center instead of the sieve upstream surface. Vassu and Zuhal are working on changing the rotation axis so that the hole locations at the sieve upstream surface do not change.
    • When we compare 1D plots, we should zoom in on the primary peak.
    • We were originally putting tight cuts on the theta thrown by the generator so that we only looked at the two tilted holes, but Kent suggested that we opened up these cuts so that we don't miss anything.
      • We can use the virtual plane just upstream of the sieve to cut out particles that don't hit the sieve near the hole(s) of interest.
    • Why do we see such a large secondary peak on the 1D r' plots?
      • The secondary peaks for all three passes have approximately the same number of counts while the primary peaks hugely decrease in amplitude as the beam energy increases.
    • We can check for slit scattering by looking at how many particles lost significant energy when traveling through the sieve.

In order to place the bid for the sieve, we need to know:

  1. How many holes on the sieve?
  2. What are the radii of the holes?
  3. What are the approximate hole locations? (This can be tweaked slightly after the bid.)

Main Tasks to Focus on:

  1. Look at how hole tilting effects the results on the GEMs. If we see much cleaner results with tilting implemented, then that means the there is too much slit scattering occurring with the small sieve holes. We should make the holes bigger.
  2. Create 5-pass r vs phi plots. This can help us figure out if we need more large radius holes.
  3. Figure out the smallest radius that we can place a sieve hole at and still see particles from it travel through the main acceptance. This step is less time sensitive because if we want a hole at a smaller radius, then we should shift an existing hole down instead of adding a new hole.

Meeting link information

See email invitation, or contact David Armstrong, Kate Evans or Jennifer Finch for Zoom link