E-rhic-ir-l mailing list

[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear All,

I was wondering we have something which needs discussion today?

Thanks elke

On Aug 17, 2017, at 12:10, Bill Christie <christie AT bnl.gov> wrote:

Dear All,
   Below please find the minutes from our meeting on August 4th.
   Greetings,
       Bill

    Minutes from the eRHIC IR Design meeting held on August 4, 2017
---------------------------------------------------------------------------------------
Agenda:
  - Bob's Presentation
  - Update on effort to match IR to the rest of the Lattice
  - Geometry Update
* Bob's Presentation:
  - presents argument why for ring-ring design one expects (possible?) epsilon_y_e << epsilon_x_e
  - makes point that with short, flat beams that one may be able to operate without crab cavities and lose only ~40% of the luminosity.
  - brief discussion of whether it could be possible to operate without a crossing angle, difficult is one wants a small beta*.
  -  Bob explains the choices of divergences, essentially balancing luminosity vs acceptance and measurement errors.
  - Elke emphasizes the point again that the possibility of running with small divergences in both directions (x & y) will be an important feature (choice #3 in Bob's list). Important for the p-e physics program.
  - Elke makes the point that the divergence of the Au beam is important as well, as it ties into the neutron acceptance. As important as the proton divergence is in p-e.
  - Bob presents slide defining three levels of cooling
  - Conclusion on cooling discussion, it gets down to how one wants to present it
  - Moderate cooling with CeC:
     - If CeC works then all good
     - If CeC doesn't work, assess different cooling techniques
End of Bob's presentation
* Matching IR to rest of Lattice Update
  - One meeting has been held
  - Homework was assigned and done
  - Discussions at meeting
     - Parameters to use (language)
     - Which things to work on first
  - An ongoing effort
* Geometry Update
  - Bill had talked with Ferdi about desire to have the geometry for the IR put into a drawing
  - Ferdi commented that too early to get designers involved, to involve them one needs precise numbers, inefficient at this point
  - Idea to try and draw up preliminary geometry drawings with simpler software packages
     - Suggestion to speck with Dejan about possibly getting Stephen involved in this

* Discussion of next meeting
  - Schedule for two weeks from today (i.e. next mtg on August 18th  at 2 pm)
                 - Cancel if deemed desirable
  - Update on geometry
  - update on the lattice matching effort.
                      End of Meeting
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