E-rhic-ir-l mailing list

["Christie, William" <christie AT bnl.gov>]

Dear All,
     Below please find the minutes from our eRHIC IR Design meeting that 
was held on Friday, 10/5/2018. Please note that our next meeting will be 
on Friday October 19th, starting at 2:30 pm.
     Greetings,
         Bill

   Minutes from the eRHIC IR Design meeting held on 10/5/18
  ---------------------------------------------------------------------------------
* We started with a brief discussion of the agenda for the meeting.

* We started with a verbal update by Doug on the integration issues in the IR region.
   - Recent iterations with Stephen
   - Had to move IR towards the inside of the RHIC ring by 1 m. Has now done so.
   - Still in progress
   - The current configuration includes:
      - 1 m radial move of the IR towards inside of RHIC ring.
      - 10 mr rotation of the entire IR design configuration about a vertical axis through the collision point.
      - 25 mr crossing angle for the beams.
   - Looks promising.
   - Next there needs to be an update from Guillaume on the Hadron ring.
   - Question whether this integration issue has been looked at for both IR 6 and IR 8?
      - Not clear, but likely this has only been looked at for IR 6.
   - Need to determine what the constraints are for sPHENIX to be an eRHIC detector.

* Simulation Update (verbal) from Elke:   
   - Looked at whether nuclei can be detected if only one nucleon is knocked out.
      - getting setup for this study
   - looking into coherent vs incoherent scattering
   - Nothing yet for the new IR design. Waiting to get the next complete IR design.
   - Working with Christoph to get things ready for the upcoming EIC Collaboration mtg at the end of October.
 - Bob will give the IR talk at the JLAB mtg.

* Brief discussion on pCDR costs.
* Brief discussion on the MADX files/software and its limitations.

* Walk through Bob's latest IR design update (version 8a): File attached.
   - Slide #6:
       - Boxes represent the magnet apertures
       - "tiling" the magnets (offsetting along beam lines e and hadron magnets) gives much more geopmetric space between the e and hadron lines.
   - Bob and Brett will discuss ability to change the B1 field strength with Guillaume.
   - Slide #9:
      - Tilt angles are given with respect to the hadron beam.
   - Slide #22:
     - Rear side for Hadron beams
       - Blue = Y divergence
       - Red = X divergence
       - dotted = scaled X
>>>>> Bob proposes that the apertures shown on Slide #22 is accepted as a "constraint" on the IR design. "Estimate" of the worst case. <<<<
   - Slide #25:
     - 22 mr listed should be 25 mr
   - End of presentation.

* Discussion:
   - It was decided (prior to today's meeting) that Brett would be in chanrge of the cost estimate for the IR magnets.
   - The proposal is to take Bob's latest design, version 8a.

* Next meeting:
   - In two weeks, which means on Friday, October 19th.
   - Agenda is to have dry runs of the presentations that will be shown at the EIC Collaboration meeting.
   - Elke will (and did) arrange for a dial in. Info. is below:

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Attachment: 1809-IR-update-v8a.pdf
Description: 1809-IR-update-v8a.pdf