E-rhic-ir-l mailing list

[Bill Christie <christie AT bnl.gov>]

Dear All,
    Below please find the minutes from the eRHIC IR Design mtg that was 
held on 10/20/17. I'd like to thank Elke for taking minutes for the 
period after I had to leave the meeting for another commitment.
     Greetings,
            Bill

                Minutes for the eRHIC IR Design meeting
------------------------------------------------------
                           Meeting date October 20, 2017

* We started the meeting by going over the agenda. Brett had just put 
out a new presentation, and we started the meeting with it.
* Brett's Presentation:
    - Brett's presentation presented an idea to use a combined function 
magnet for the magnet that resides closest to the detector on the 
incoming electron side.
    - A question came up: "Why would we want to consider a combined 
function magnet for this application?"
        - Answer: This would reduce the amount of material that we 
would have to put in this location. It would cancel the dipole field, 
and leave a bit of a focusing field for the electron beam.

* We then moved on to a discussion of the design of the beampipe through 
the detector, and out to the first magnet on either side of the 
detector. Bill had taken the "cartoon" figure for this pipe that Brett 
had put together after our discussion on this topic last May. Bill put 
this figure onto a slide, and added on all of the numbers/dimensions 
that had come up in these earlier discussions. For reference this figure 
is attached to these minutes. During this discussion Bill had to leave 
for another commitment, and Elke kindly continued with the minutes.
    - The beampipe needs to be NEG coated. How to clean and coat(?) the 
pipe may be an issue.
    - The coating has to be able to carry an electric current.
    - Will be necessary to re-activate the NEG coating ~ 3 times per year.
    - The near side needs another close look to see if there is enough 
space for the luminosity monitor.
                                        End of meeting.

    I (Bill) don't know of any discussion about the agenda for the next 
meeting on November 3rd. A draft agenda is:
    - Discussion of the status on the linear optics
    - A status update on the geometry software effort
    - A discussion on the new idea Brett sent out to the E-mail list on 
October 30th. I've also attached the figure that Brett sent out with the 
idea to these minutes.
    - AOB

Attachment: Brett_rr_play.pdf
Description: Adobe PDF document

Attachment: beam_pipe_sketch.pdf
Description: Adobe PDF document