E-rhic-ir-l mailing list

[Bill Christie <christie AT bnl.gov>]

Dear All,
    Below please find the minutes from the eRHIC IR meeting that we 
help on February 17th. Please let me know of any corrections, etc.
    Greetings,
        Bill

        Minutes for February 17th eRHIC IR meeting

    The primary purpose of this meeting was to ensure that the files 
containing the details of the IR magnet configurations had been passed 
to Richard for his simulation effort, and to clear up any questions 
as/if necessary. There was a problem with the initial files passed, but 
Bob, Brett, and Richard resolved it, and all is clear and correct.
    General Question: Is the placement of the IR magnets the same for 
the High Luminosity (HL) and the High Acceptance (HA) running scenarios? 
Answer: Yes.
    The configuration that Richad will be simulating is the HL 
configuration with no cooling. It will start with a proton beam energy 
of 275 GeV.
    A discussion of what the inputs are to the configuration version 
control that we discussed earlier. The goal of this version control 
system is that we can completely identify exactly what the inputs and 
geometry are/were for any simulation result. Originally it was thought 
that just having version cntrol on the magnet placements and strengths 
was sufficient for this. In the discussion it came up that one also had 
to specify the set of beam parameter values used in the simulation, and 
that magnet configurations and beam parameter configurations were not 
always matched one to one. We concluded that the version control system 
would have to track both magnet configuration, and beam parameter 
setting files. Vahid, as master of the version control, tasked to come 
up with a scheme to do this.
    At this point the original goal of this meeting was achieved, but 
we continued.
    Bob had some new ideas and files that were discussed. Early in this 
discussion it was concluded that there needed to be a moderate, as well 
as a high luminosity configuration for presentation at the upcoming review.
    Brett points out that one possible configuration of the 
spectrometer put the scattered proton towards the electron beam. It was 
pointed out that this (scattered proton towards the electron beam??) has 
been the default, and it was proposed that we stick with this 
configuration for the upcoming review.
    Also stated that for the review we need to have a 10**34 luminosity 
option. Bob indicated that there were two paths to 10**34, one of which 
is without cooling. The no cooling option can't be simulated before the 
review.
    For the review, the baseline path to 10**34 is the one that 
includes cooling.
    Elke brought up a question that she had sent to Vadim: The bunches 
have a polarization profile in X and Y. Crab cavities cause a rotation. 
The bunch in the IR is different from the bunch in IR12. Does this 
impact the polarization profiles? Vadim will follow up on this in a 
private conversation.
    It was pointed out that Steve Tepekian, as well as Sergei ? and 
Steven ? should be invited to these meetings.
    The Agenda for the next meeting, which will be help on March 3rd is:
    - Simulation status update
    - Synchrotron Radiation
    End of meeting