sPHENIX is a new detector at RHIC.

["Sickles, Anne M" <sickles AT illinois.edu>]

Hi Dennis & all,

Thanks for the work on the BUP. It reads well and clearly presents our the justification for our requests.

bigger comments

The first two paragraphs of executive summary is (exactly?) the same as the 2020 BUR. While we haven't updated the plan or the motivation, I think it would be useful to update some of the language here to reflect that sPHENIX is planning on taking data very soon. Specific suggestions would be:

• Remove "The effort to construct the experiment is officially underway" and replace it with something like "sPHENIX construction is nearing completion with significant components of the detector already in place."
• The list of additional subdectors should include TPOT and the EPD.
• Change "The sPHENIX resource-leaded schedule leads to a first year of operation in 2023" to "The collaboration and the project expect to be ready to take data in 2023."

on line 262 we state "The pp baseline is the dominant contributor to the statistical uncertainties in many of the unique, flagship sPHENIX measurements." This is an important point and I would repeat this in the discussion of Table 4.1 where it is really clear.

other comments

• line 66: "As of early 2020", can we update this to be more recent even if the number of institutions hasn't changed.
• line 99: "are being" to "have been"
• line 114: this cites the early completion date as November 2021. That's not correct anymore, right?
• is the PD-4 date still December 2022?
• line 275: "Chapter B" -> "Appendix B"
• line 283: rephrase, this seems to say that the deadtime is >90%
• Table 4.1: I think this is in the 62/pb pp scenario. I would just state that clearly in the caption.

Best,

Anne

---------------------------------------------------------

Anne Sickles

Associate Professor

University of Illinois at Urbana Champaign

sickles AT illinois.edu

---------------------------------------------------------

On May 7, 2022, at 1:02 PM, Perepelitsa, Dennis via sPHENIX-l <sphenix-l AT lists.bnl.gov> wrote:

Dear sPHENIX colleagues,

I have posted an internal, line-numbered draft of our Beam Use Proposal 2022 in the Indico area used for yesterday’s BUP discussion. You can find a direct link here: 

https://indico.bnl.gov/event/15682/contributions/63109/attachments/40862/68320/sPHENIX_Beam_Use_Proposal_2022_InternalDRAFT.pdf 

We welcome any comments from the Collaboration by Wednesday, May 11th, with a plan to then submit an updated document to the ALD and PAC on Friday, May 13th. Comments sent in thread to the list or to myself privately are both OK.

Thank you to the TG Conveners and individual analyzers, the Commissioning Task Force, and many of you for very useful discussions and help with physics projections and document preparation.

Looking forward to your comments, 

Dennis

Dennis V. Perepelitsa

Assistant Professor, Physics Department

University of Colorado Boulder

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