E-rhic-ir-l mailing list

[Bill Christie <christie AT bnl.gov>]

Dear All,
    Below please find the minutes from our eRHIC IR Design meeting that 
was held on Friday, 1/26/2018.
    Greetings,
        Bill

    Minutes from the eRHIC IR Design meeting held on 1/26/18
-------------------------------------------------------------------------------
* We start with a review, and agreement of/on the Agenda:
    - "Final" Presentation of Tables
    - Update on Simulations
    - Update from Charles on the Vacuum design

* We go through Bob's presentation "1801-update-v4.pdf"
    - We walked through the slides to the last slide with the table of 
magnet and beam parameters for the Electron beam.
    - Bob indicated that he'd checked all of the numbers in the table, 
and that they were final until Steve T. has had a chance to check them 
in his routines, and if/as necessary commented on any necessary changes.
    - Hadron beam/magnet parameters are not in Bob's presentation.
    - Guillaume indicates that the parameters for the Hadron setup are 
still in flux
    - Confident that "There is a solution" for matching to the ring lattice
    - Final Hadron parameter table is pending one more matching 
exercise by Guillaume. Estimate is 3 to 5 days to complete.
    - Topic came up regarding need for more space for vacuum warm to 
cold transition and flanges. Agreed that the magnet placement will not 
be modified at this point/stage to make this extra space (~ 30 cm) 
available.

* Update on Simulations, by Alexander
    - there have been a few iterations on vacuum system geometries with 
Charles
    - Almost all configurations were able to be imported into the 
simulation framework
    - Working on simplifying the configurations to get down to the 
"necessary" level of complexity so that the physics simulation results 
are valid/robust, but that simulation runs in finite amount pf time.
    - Working to get a "realistic", complete system imported for 
simulations.
    - Need final magnet parameter tables for the electron and Hadron 
beams for use in simulations.

* Action item: Bill will send an e-mail to Bob, Steve, Guillaume, and 
Alexander. Message is t please send the final tables to Alexander and 
Bill as soon as they are available.

* Vacuum Update by Charles
    - Points out that there was already some discussion earlier today 
concerning need for more space along beamline for transition.
    - current space between detector and first magnet is 50 cm, need 
~80 cm.
    - Decision to keep the current 50 cm space through the pCDR. Point 
out that this will be addressed after the pCDR.
    - Charles will make a realistic, 80 cm, design. Charles and Alex 
will settle on a 50 cm design that will be used for the simulations, 
again, until after the pCDR.
    - Charles asks whether he has the current correct magnet locations 
and geometry.

* Alexei introduces himself to the meeting.
    - He will be working on impedance calculations, given/using Charles 
vacuum design.
    - Requests that Charles any relevant vacuum geometry files that he has.

*AOB
    - Charles asks about any new magnet configuration on the downstream 
side. Bob answers no plan for this now.
    - Charles also mentions that he's got a reference for a very thin 
(~120 um) permanent heating element design that could perhaps be 
considered for the IP beam pipe bakeout. Paper "Design of beampipes for 
LHC experiments.pdf.

* Discussion and decision to hold next meeting in one week, on Friday 
Feb. 2nd.
- Draft agenda for next meeting:
        - "Final" Tables
        - Simulation update
        - Vacuum update
                End of meeting

Attachment: 1801-update-v4.pdf
Description: Adobe PDF document

Attachment: Design of beampipes for LHC experiments.pdf
Description: Adobe PDF document