E-rhic-ir-l mailing list

[Vadim Ptitsyn <vpi76 AT icloud.com>]

Dear All,

attached are slides about eRHIC luminosities which are mentioned in the 
Minutes.


With best regards,
                                Vadim Ptitsyn.

Attachment: eRHIC_lumi_in_store.pptx
Description: application/vnd.openxmlformats-officedocument.presentationml.presentation

> On Jul 31, 2018, at 4:51 PM, Bill Christie <christie AT bnl.gov> wrote:
> 
> Dear All,
>     Below please find the minutes from our eRHIC IR Design meeting that was 
> held on Friday, 7/27/2018. Please note that our next meeting will be on 
> Friday August 10th, at 3 pm.
>     Greetings,
>         Bill
> 
>   Minutes from the eRHIC IR Design meeting held on 7/27/18
>  
> ---------------------------------------------------------------------------------
> * We started with a brief discussion of the agenda for the meeting.
> * Brief discussion and presentation by Vadim and Elke on a response to a 
> request from Bob Tribble concerning eRHIC luminosities and luminosity 
> lifetimes.
>     - Vadim walked through the slides that he and Elke had put together.
>     - In the discussion it was decided to remove the information/row for 
> the number of running weeks per year. This number will rely on future 
> operations budgets, and unknown at present.
>     - The tables presented, along with Elke's spreadsheet, will be sent to 
> Bob Tribble.
> * We then walked through a presentation by Doug on integration into the 
> RHIC tunnel (attached file 6IR Layout Development Update 2018-07-27.pptx)
>     - Shows 6:00 IR layout with a 22 mr crossing angle
>     - Walks through series of slides
>     - Includes the Rapid Cycling Synchrotron (RCS) version 11
>     - There is a discussion about how many crab cavities, and how many crab 
> cavity cryo enclosures. Qiong will provide this information to Doug.
>     - Point comes up that the ring frequencies are being discussed again 
> for possible change.
>     - Discussion of how the magnets integrate into the exiting RHIC ring 
> (i.e. where beams go back into existing RHIC ring magnets)
>     - In the discussion on how to reduce the cost for the IR design, 
> integrate the IR magnets and RCS into the RHIC tunnel, and match the beams 
> back into the existing RHIC ring magnets expected to be used in eRHIC, the 
> three parameters to vary/optimize are:
>         - Translate the collision point in the IR (radial translation was 
> discussed)
>         - Rotate the entire IR magnet setup about a vertical axis through 
> the collision point.
>         - Change/increase the crossing angle.
> 
> DESIGN STUDY PHILOSOPHY:
>     The discussion about changes to the "Baseline" eRHIC design, which is 
> what appears in the pCDR, led to the following philosophy. We'll embark on 
> design studies of how to optimize (reduce) the cost, and ease the 
> integration and matching into the RHIC rings, of the IR design. No changes 
> will be introduced/adopted into the current "Baseline" design however until 
> a more formal process is agreed upon, and then followed. A likely scenario 
> is that once we believe that we have a better IR design, with essentially 
> all issues investigated, addressed, and resolved, that we'll propose a 
> formal change to the baseline design. When this occurs, the formal eRHIC 
> design change formalism will be followed.
> 
>      - We discussed and decided that of the three parameters discussed 
> above, for the design study venture, we'll take as the working crossing 
> angle 25 mr (Baseline design crossing angle is 22 mr).
>     - We discussed a bit whether we could set limits on the likely range of 
> the IR Design rotation angle. Agreed that the limits were between 5 and 10 
> mr.
>     - In looking at Doug's #D renderings of the IR and RCS design in the 
> RHIC IR region, the question came up whether the RCS was a "flat" ring 
> vertically (i.e. lies in a single horizontal plane). Answer was that yes, 
> it is a flat ring, and in the present design it resides 0.5 m above the 
> RHIC rings.
> 
> * Discussion of the next meeting:
>     - Next meeting in two weeks on Friday, August 10th.
>     - Draft Agenda:
>         - Update from Doug on Integration
>         - Update on the designs by Bob and Holger
>         - Summary from the EIC Users meeting
>                             End of meeting
> <6IR Layout Development Update 
> 2018-07-27.pptx>_______________________________________________
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