sPHENIX cold QCD topical group

["Aidala, Christine" <caidala AT bnl.gov>]

Below are minutes from the discussion of the LOI charge that was held on Friday.

 

Christine

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In attendance: Christine, Nils, Dave, Gunther, Abhay, Sasha Bazilevsky, Ernst, Jin, Joe Osborn, Paul Stankus, Pawel, Yuji

 

Here is the modified language that was presented for discussion (see the slides at https://indico.bnl.gov/event/4377/contributions/20417/attachments/17883/22050/LOIChargeDiscussion20180316.pdf)::

 

“You are asked to establish a detector study group consisting of members of sPHENIX and any individuals interested in EIC science from outside the sPHENIX collaboration that can update the Letter of Intent for an EIC detector built around the BaBar solenoid in the context of the eRHIC pre-CDR and perform a cost estimate of the construction costs in FY2018 dollars. This estimate should be performed with the methodology that Diane Hatton has developed for EIC and that Elke Aschenauer and her group is using to develop a cost estimate for a generic EIC detector in conjunction with the ongoing pre-CDR cost estimation process.  The Letter of Intent should contain an outline of the expected physics program for the detector in the first five years of running using estimates of the luminosity development anticipated for initial EIC operation.

 

A brief presentation on the physics capabilities of the detector should be prepared for the PAC meeting in June.  The complete version of the updated LoI and the updated cost estimate should be ready at the time of this year’s RHIC Site Visit, tentatively expected in the second part of September 2018.  When the complete versions of the LoI and cost estimate are available, a review will be scheduled, similar to the one held in 2014.”

 

 

One of the goals: Language that makes it easy for individuals and groups outside of sPHENIX to participate – Richard Milner (via e-mail) and Ernst Sichtermann (on the call) both stated that they found the draft language in the slides suitable in this respect.

 

Items for further discussion to consider for additional modifications to the charge:

 

1.      “using sPHENIX as a basis”(term in the opening paragraph of Berndt’s original e-mail) – Should consider language that is clearer about what “sPHENIX” is assumed to be, e.g. including MVTX or not?  Descoped EMCal or not?  Perhaps refer to the “reference configuration” that served as the reference for the 2016 descoping charge.  Also don’t want language in the charge that could be construed as constraining us to reuse every single component of sPHENIX. 

 

2.      Timescale – RHIC Site Visit in September believed to be somewhat arbitrary.  Important thing is likely to be ready with a document and cost estimate in hand whenever CD-0 may be granted to EIC.  Should we consider proposing alternative language in the charge regarding timescale?  E.g. “end of September”?

 

3.      Review of LoI and cost estimates when they are complete –The 2014 for the previous LoI was not in fact a BNL review!  BNL did NOT take action to review that LoI, and PHENIX had to organize its own review.  We should add more explicit language in the charge about the review process that will follow delivery of the LoI and updated cost estimates. 

 

 

Other notes:

Cost guidance – Dave and Gunther requested some kind of total cost guidance from Berndt, but Berndt does not wish to cite a dollar value.  There is a sense from Berndt that a detector based on sPHENIX as a starting point should be “significantly” less costly than a green-field detector design; however, this has not been quantified.  There was general sentiment among those in the discussion that we should present a detector to do the physics, not a detector designed to be cheap.

 

eRHIC pre-CDR is expected April 9, to undergo a BNL review later in April.  We should identify exactly what we need from C-AD and contact them with a request.  Even after we have the full pre-CDR document in hand, should plan a meeting with relevant individuals from C-AD to ensure that we are on the same page with regard to luminosity and energy development as well as IR design. 

 

We should consider individuals to approach—e.g. detector experts, physics experts—to ask them to consider contributing to the LoI.

 

 

 

From: sPHENIX-cold-QCD-l [mailto:sphenix-cold-qcd-l-bounces AT lists.bnl.gov] On Behalf Of Aidala, Christine
Sent: Thursday, March 15, 2018 11:15 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: Re: [Sphenix-cold-qcd-l] Discussion of EIC detector LOI charge Friday, Mar 16, 4:00 pm EDT

 

Dear all,

 

An agenda page has been created for the discussion tomorrow:

https://indico.bnl.gov/event/4377/

 

The Bluejeans connection is https://bluejeans.com/345777492.

 

Sasha has reserved Room 2-219 in the Physics Department for those at BNL.

 

Best regards,

Christine and Nils

 

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Christine A. Aidala
Associate Professor
Department of Physics
University of Michigan
(734) 764-7611

 

 

 

 

 

From: sPHENIX-cold-QCD-l [mailto:sphenix-cold-qcd-l-bounces AT lists.bnl.gov] On Behalf Of Aidala, Christine
Sent: Wednesday, March 14, 2018 10:19 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: [Sphenix-cold-qcd-l] Discussion of EIC detector LOI charge Friday, Mar 16, 4:00 pm EDT

 

Dear Cold QCD TG members,

 

We apologize for the short notice, but Nils, Gunther, Dave, and I will hold a discussion this Friday, March 16, at 4:00 pm EDT, of how to potentially modify the draft charge from Berndt Mueller such that it allows us to move forward effectively in preparing the LOI.

 

Minutes will be sent out for those cannot attend, and individuals are encouraged to give input via this list or by contacting us directly.  The original draft charge from Berndt is below, but note that he has already agreed with Dave and Gunther to the modification that no cost estimates would be expected by the PAC meeting.  One of our main goals in proposing a further modified charge is to ensure that individuals outside of sPHENIX who are interested in EIC science can formally be part of preparing the LOI and feel welcome to do so.

 

Best regards,

Christine and Nils

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Dear Gunther & Dave:

 

As you know, the eRHIC design team is close to completing the pre-conceptual design report, the NAS Study Panel is expected to publish its assessment of the value of a US based EIC in the May time frame, and DOE may declare CD-0 for an EIC sometime in the second half of 2018. In this context it will be important that we have a clear and up-to-date understanding of the value of sPHENIX as the basis of a Day-1 eRHIC detector. The ePHENIX Letter of Intent now is four years old and urgently requires an update that takes into account the developments in detector technology and interaction region design.

 

For this reason, I ask you to establish a task force within the sPHENIX collaboration that can update the ePHENIX Letter of Intent in the context of the eRHIC pre-CDR and perform a cost estimate of the construction costs in FY2018 dollars. This estimate should be performed with the methodology that Diane Hatton has developed for EIC and that Elke Aschenauer and her group is using to develop a cost estimate for a generic EIC detector in conjunction with the ongoing pre-CDR cost estimation process. It would be useful if the Letter of Intent would contain an outline of the expected physics program for ePHENIX in the first five years of its operation using estimates of the luminosity development that Ferdinand Willeke can provide.

 

I would like to schedule a brief presentation on ePHENIX at the PAC meeting in June; thus, it would be ideal if at least a first draft of the updated LoI and the updated cost estimate would be ready internally to the collaboration. The complete version of the LoI should be ready at the time of this year’s RHIC Site Visit, which will probably be held in the second part of September 2018. I will ask Maria Chamizo-Llatas to schedule a review, similar to the one we held in 2014, when the complete versions of the LoI and cost estimate are available.

 

These are exciting times for all those interested in the physics of an EIC. The facility is finally at the doorstep from concept onto the path toward realization. I hope that this request will build on and further strengthen the excitement of all those within the sPHENIX collaboration who are looking forward to participation in a future EIC physics program.

 

Best regards

Berndt

 

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Christine A. Aidala
Associate Professor
Department of Physics
University of Michigan
(734) 764-7611