[Psqateic] [EXTERNAL] Re: PSQ at EIC White Paper

Sun Aug 7 15:23:59 EDT 2022

I agree that we need to be careful about how this discussion is phrased.
My understanding is that the current machine design *does* provide higher
luminosity than was being discussed when we first started putting all of
this together.  So we need to be careful about separating the benefit of
having higher luminosities over a range of energies relative to earlier
assumptions (and, e.g., the earlier White Papers) from the need for FURTHER
improvement.  In many cases, we are highlighting the benefit over earlier
estimates based on already-implemented changes, and in some (fewer) cases,
we're discussing what additional changes (luminosity, secondary focus,
etc...) could give.

Best,
John

On Sun, Aug 7, 2022 at 10:50 AM Pawel Nadel-Turonski <turonski at jlab.org>
wrote:

> Dear Volker, All,
>
> She time ago I expressed some worries about that some of the underlying
> assumption of this report did not correspond to reality, and as such there
> was a risk that it would do more harm than good. This latest version has
> not allayed my misgivings. I will provide detailed comments later, but my
> two main concern are the following.
>
> 1. The report repeatedly suggests that without an increase in luminosity
> at low energy the EIC will not be able to attain its stated physics goals.
> For instance, adding "in its low-to-medium center-of-mass energy
> implementation” to the discussion on lines 10-12 in the executive summary
> serves no other purpose than to cast doubt about the general capabilities
> of the EIC.
>
> 2. In the report it is often suggested that IP8 can be “optimized” to
> reach higher luminosity at low energy. However, the ONLY actual low-energy
> optimization that has been considered for IP8 is a configuration of the
> final-focus quads that would enable slightly stronger focusing at low
> energy. In addition to this, one can consider various global accelerator
> tradeoffs that may or may not enhance luminosity at low energy - but these
> have nothing to do with IR8 or a second detector, and would apply to both
> IRs/detectors.
>
> What is unique about IR8 is a dramatic improvement in forward acceptance,
> which also improves rates for exclusive processes just as a higher
> luminosity does, but none of the simulations in the report have been done
> using realistic acceptances and thus the report has very little to say
> about this.
>
> Best Regards,
>
> Pawel
>
>
> On Aug 3, 2022, at 10:33 AM, Volker Burkert <burkert at jlab.org> wrote:
>
> Dear Colleagues,
>
>
> We are sending you this email because you have registered to participate
> in at least one of the workshops presented below, which were held on
> December 15-16, 2020, March 17-19, 2021, and July 19-23, 2021.
>
> One of the main goals of these workshops was to develop a white paper
> focused on high-impact science requiring high integrated luminosity at the
> low-to-medium center-of-mass energy of the U.S. Electron-Ion Collider
> project.
>
> This white paper is ready to be submitted for publication. As a
> participant in the workshop series, we invite you to become a co-author of
> this white paper, which can be found at this link:
> https://www.femtocenter.org/sites/default/files/docs/PSQ_EIC_White_Paper.pdf
>
> Please visit this link and review the scope and content of the white paper.
>  *If you decide to co-author the WP, please send an email
> to burkert at jlab.org <burkert at jlab.org> no later than August 12. * You may
> also suggest minor changes to the text, acknowledgements, and references,
> or make comments that would improve the WP.
>
> We have an agreement with a journal to publish the paper and we need to
> submit the final version by August 20.
>
> With best regards,
> Volker & Latifa
>
>
> *https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_9794&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=AaZvzZhV1PL8b6XVZ00EUuEDA69-Iv6g_FplcW_32rc&e=  <https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_9794&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=AaZvzZhV1PL8b6XVZ00EUuEDA69-Iv6g_FplcW_32rc&e= >*
> *https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_10677&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=W70e0QbxmnW1bMUBXo3t0IkZgRi-17yN6vRuvrzTWho&e=  <https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_10677&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=W70e0QbxmnW1bMUBXo3t0IkZgRi-17yN6vRuvrzTWho&e= >*
> *https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_11669&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=dp_xI-3RRepcEJxz603oDyQwGowAr2uOZIdE6H2RglY&e=  <https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_11669&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=lRQm7JQTTNgh9H7STdZUgbq2inxaGxMaxrjYUFO8eiw&m=_rFpiM4dzDaWd7SCQWLsFi0dkFpzoaX97KKC6C90NSXj26sx1YVGNFJqVM6wKB4V&s=dp_xI-3RRepcEJxz603oDyQwGowAr2uOZIdE6H2RglY&e= >*
>
>
>
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-- 
John Arrington
Senior Scientist, Nuclear Science Division
Lawrence Berkeley National Laboratory
JArrington at lbl.gov
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