E-rhic-ir-l mailing list

[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear Bob,

a couple of thoughts to your talk. I hope they are a bit helpful

cheers elke

I  don't know who is on the committee for this review, but they might not be familiar with EIC therefore I suggest you need one or two slides 

which state the challenges for this IR design.

I have attached a table which has them summarized.

also you can find a lot of info in https://www.dropbox.com/s/1mn6x6t9phun9nf/eRHIC.Requirements.pptx?dl=0

and for the protons and neutrons in here https://www.dropbox.com/s/9l3aggo0bbxti9p/eRHIC.Requirements.pptx?dl=0

You use abbreviations like HA, HI I would at least spell them out the first time

slide 7: I would give the equation for the process measuring luminosity ep --> e+p+gamma

             and that the gamma is converted to e+e- to reduce the SR contribution and get the precision for the luminosity measurement needed.

             maybe it would be also good to point out why we need the electron tagger 

            --> detect scattered leptons with very small Q2, which means very small scattering angle

slide 8: are really all plots fro high acceptance

slide 9: needs some labeling what the different rays represent

slide 13: this distribution of protons is valid for all diffractive processes DVCS is just a poster child for this processes

slide 14&15: you bank on what you call spectrometer, please realize nobody has developed anything for this if this is really needed this needs to be developed 

                      and shown to work the way we need

              also the RP after the cavity with the high dispersion setting are not really the best right now, one problem which is currently worked on it seems it will be very hard to reconstruct p_t 

              unambiguously, but we discussed already this needs more work

              

slide 18: I must admit I don't understand

slide 20: right now there are no RP with 50ps timing

              as we also discussed kinematic fitting cannot be something we rely on at this stage of the project, 

              there are other diffractive processes which also need the proton detection for which it might not work.

On Mar 14, 2017, at 17:30, Palmer, Robert <palmer AT bnl.gov> wrote:

Latest version of IR dry-run tomorrow

Ps I do not know what I was thinking in my last version. The use of some mix of HL and HA parameters indeed seems the right thing to do.

The current very large y divergences in both HA and HL are probably the most worrying things to discuss. We need more study of the  Low Divergence (LD), and very Low Divergence (VLD) cases that I had started looking at. I am not sure how much that should be discussed in the Review. I am also not sure how much mention I should make of the VHL (without cooling) case.

Bob

Ps I know this will have to be put into Power Point, unless we could persuade Scott to make a Tex version that mimics PP. Do we have the PP profile that we should be using?
<1703-IR-talk-v3.pdf>

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