E-rhic-ir-l mailing list

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

Dear All,
     Below please find the minutes from the BNL EIC IR Design mtg held 
on Friday, June 14, 2019.
     N.B. As Kyle is out today, I'm doing this week's minutes.
     Greetings,
         Bill
                         Minutes from the BNL EIC IR Design mtg held 
June 14, 2019
------------------------------------------------------------------------------
             Sharepoint Link for IR Design: 
https://brookhavenlab.sharepoint.com/sites/eRHIC/IR/SitePages/Home.aspx

Draft Agenda for meeting:
    - Update by Holger on the IR Magnets
    - Update by Guillaume
    - Update by Bob on some vacuum considerations
    - Update on Synchrotron Radiation studies/discussions
    - AOB

* The meeting started with a discussion of the agenda. No items were 
added to the agenda. As Guillaume wasn't present, his update was dropped 
from the agenda.

* Holger walks us through his presentation on the status of the IR 
Magnet designs and simulations.
     - His presentation is on the Sharepoint site for this weeks meeting.
    - The slides walk through the various magnets, commenting on issues, 
or lack thereof, with the various designs.

* We had a brief discussion about a "Baseline" document that gets posted 
on the Sharepont site that lists all of the various parameters related 
to the IR design and magnets.
     - ACTION ITEM: Holger and Bob will look over this document, and 
then send it to Elke for posting on the Sharepoint site. The idea is 
that this document doesn't get changed unless it is discussed in an IR 
Design meeting and/or Holger approves and announces that it has been 
changed. In later discussion in the meeting it was discussed that Elke 
will create a Folder on the Sharepoint site with an appropriate folder 
name to place this, and other controlled documents.

* It also came up in this same discussion that it is important to know 
if there is a solution for matching the electron beam into the rest of 
the ring with the parameters listed in this document associated with the 
electron beam. Stephen estimates he could have a result on this next 
week. If so, he will send an E-mail to the IR Design mailing list 
describing the results of his study. We'll also put him on the agenda 
for the next meeting to present his study.

* Next Bob presented his slides.
    - His presentation is on the Sharepoint site for this weeks meeting.
    - In his presentation Bob was discussing issues associated with 
aperture requirements in the IR Design to deal with the beam envelopes, 
scattered electrons and hadrons, and in particular the synchrotron 
radiation fans that one might have to deal with, motivated by Mike's 
synchrotron radiation simulation results presented at the previous IR 
Design mtg.
    - In Bob's presentation, in addition to many other things, he showed 
how increasing the diameter of the round beampipe at the IP from 3 to 4 
cm radius alleviated some possible aperture issues. This stimulated a 
discussion about what the effect of a change like this would have on the 
detector design and physics program. The conclusion of the discussion is 
that no change to the current 3 cm radius for this IP beampipe is going 
to be made or presented at this time, but that clearly this is a design 
parameter that will need and get more discussion as time goes on.
     - It was discussed a bit that there is a current, ongoing effort 
associated with KeK to iterate and try to resolve inconsistencies 
between their synchrotron radiation simulations and their actual 
observations as they are commissioning the machine. This effort will be 
tracked, as it has direct bearing on the aperture considerations for the 
EIC IR design.

* It was discussed that any beta* parameters in the Baseline IR Design 
parameter document that Bob and Holger post get taken out of the 
document. Vadim has a Spreadsheet that contains what will be treated as 
the "baseline" machine IR optics parameter document. This document will 
get posted in the Controlled document folder that Elke will create on 
Sharepoint. Just like the document that Holger and Bob will be placing 
in this folder, changes to this optics parameter document will be 
controlled in the same fashion.

* Discussion of the next meeting:
     - The meeting will be held two weeks from today, on Friday June 28th.
    - Draft Agenda:
       - Presentation by Stephen on his Electron Matching study
       - pCDR Status update
       - AOB
                                             End of meeting.