sPHENIX cold QCD topical group

[Nils Feege <nils.feege AT stonybrook.edu>]

Hi Dave and all,

I agree it is important at this point to be open and inviting to other people to join efforts to design an EIC detector using the BaBar magnet. However, the statements we were making in the past about sPHENIX' overall viability as an EIC detector seemed much stronger. To quote a few lines section 2.6 from our recent Forward sPHENIX LOI:

"The sPHENIX detector and the forward upgrade presented in this document are designed to form a suitable basis for an experiment at a future Electron Ion Collider."

"An EIC detector based on sPHENIX has excellent performance for a broad range of EIC physics measurements."

"An EIC detector based on sPHENIX is well suited to address much of the physics enabled at eRHIC."

In that section of the LOI, we talk about using all of sPHENIX + forward instrumentation (including tracking and calorimetry) for EIC. I think it should still be part of your message / conclusion slide that sPHENIX with all its calorimeters would in principle work as a first EIC detector if all we change is adding the PID and electron-side calorimeter. Unless, of course, we believe for some reason that that's not true anymore.

There is clearly room for improvement in this design and the limitations (and solutions to those limitations) need further study. So yes, there is still lots of opportunity for people to change the detector design and make a strong impact, and it's good to stress that as well.

Best,

Nils

On Tue, Nov 28, 2017 at 10:38 AM, David Morrison <morrison AT bnl.gov> wrote:

Hi John,

Right, that's my thinking.  I think we come out of this in a stronger
position if the EIC community understands sPHENIX as a potential
precursor – and perhaps the most realistic precursor - to an excellent
EIC detector.  There will naturally be debates as we go forward about
what sPHENIX elements might be reused or rebuilt or replaced for the
purpose of an EIC detector.  My response would be that even at the very
extreme end of that spectrum of views, that none of the sPHENIX
detectors are suitable for an EIC detector – a view I don't share, btw –
the community should very seriously consider the sPHENIX solenoid and
flux return as a foundation.  Design around that and you're already
several steps ahead.

At the same time, I do want the audience to know that we didn't sit on
our hands following the writing of the 2014 LoI.  For that, I could use
some help adding detail to slide 16.  A list of specific studies that
have been done since then would convey to people the seriousness of the
effort that has continued to go toward an EIC detector built on sPHENIX.
 I wouldn't have time to describe those studies, but rattling them off
would show that the effort is vibrant and current.  I'd also like to
annotate the various detector cutaways to show how EIC detector R&D is
playing a role.

Cheers,
Dave

On 11/28/17 9:25 AM, John Lajoie wrote:
> Hi Dave,
>
>     I very much like your approach and especially your statement in the
> conclusions -  the solenoid and flux return (HCAL) are a great
> foundation.  The traditional argument against the "ePHENIX" approach has
> been to focus on a particular aspect of detector performance and use
> that to declare the approach unsatisfactory, and this undercuts that
> argument very effectively.  I'm sure what you will say on slide 10
> (something like "...this is one possible implementation..." ) will be
> consistent with your approach.
>
> John
>
>
> On 11/27/2017 4:06 PM, David Morrison wrote:
>> Dear sPHENIX,
>>
>> I'll be giving a 10 minute (!) talk this Thursday at the EICUG Detector
>> Discussion Meeting at Temple University.  I'll be the last in a series
>> of talks about detector concepts, and the talk is so brief, that I'm
>> planning to focus on one main point – that starting with the BaBar
>> solenoid in the sPHENIX support structure and with the oHCal as an
>> instrumented flux return is a a great starting point for an EIC
>> detector.  Of course, you can do even better by also using the TPC and
>> the MVTX and the EMCal, but I think presenting a nearly "blank canvas"
>> as part of the spectrum of options has the potential to be maximally
>> inviting.
>>
>> My draft slides are here:
>>
>> https://www.dropbox.com/s/y2ib26f7iwz6h68/EICUG.pptx?dl=0
>>
>> Nils and Jin helped me get some up to date dimensions for the current
>> EIC concept detector to Dan Cacace, who has made some nice 3D
>> renderings.  I'm very happy to get feedback.  The big constraint is the
>> alloted time, so for anything significant that goes in, something will
>> have to come out.
>>
>> I need to add names and institutions to some of the slides and finish
>> adding labels to some of the renderings.
>>
>> Cheers,
>> Dave
>>
>
>

> *John Lajoie*
>
> Professor of Physics
>
> Iowa State University
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--
David Morrison  Brookhaven National Laboratory  phone: 631-344-5840
                Physics Department, Bldg 510 C    fax: 631-344-3253
                          Upton, NY 11973-5000  email: dave AT bnl.gov

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Dr. Nils Feege

Research Assistant Professor

SUNY at Stony Brook

Department of Physics & Astronomy

Stony Brook, NY 11794-3800

e-mail nils.feege AT stonybrook.edu

skype nils1920

phone +1-631-632-8710

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