sPHENIX is a new detector at RHIC.

["W.A. Zajc" <zajc AT nevis.columbia.edu>]

Dear Jamie, Sasha, John, Jin, and Dennis:

Apologies for missing the deadline on BUP comments. I have just a remark or two:

Overall, I very much like the strategy of providing it as prefix to the extant Beam Use Proposal. It gives context to the current exercise (in futility). 

I assume we wish to argue strongly that 20 cryo weeks is a disaster (not to mention brain dead, given the end effects). So I am concerned that the bottom line sentence

"We emphasize that many of the core sPHENIX physics measurements can still be made;  however, there is substantial increased risk to the entire physics program.“

may be misconstrued as “We can accomplish what we set out to do.”

To address this, I suggest changing “many” to “several”. It changes the sense of the sentence considerably. 

Furthermore, to address the brain-dead aspect of 20 weeks, you may wish to follow this sentence with another, along these lines:

“This risk is the inevitable consequence of running periods so constricted that they are dominated by end effects and commissioning times rather than physics running.”

There is also a sentence that has some form of typo, on line 99, “to clear” —> “to clarify” or “to measure”. 

As a random sPHENIX-ian, I would like to express my thanks for all the hard work that went into preparing this document!

Best regards,

Bill 

—————————————————

W.A. Zajc
I.I. Rabi Professor of Physics
Columbia University
New York, NY 10027

https://blogs.cuit.columbia.edu/waz1/
—————————————————

On May 21, 2021, at 9:30 PM, Anthony Frawley via sPHENIX-l <sphenix-l AT lists.bnl.gov> wrote:

Dear Jamie and All,

Something that Marzia has emphasized should, I think, come across clearly in the discussion about Au+Au in the 20 week scenario. Namely, in that scenario there will not be a physics result for the Y(2S) measurement from the 2023 run. The physics recorded luminosity in 2023 will be ~ 1/10 of the total, in the 20 cryoweek scenario, in the best case. It will be ~ 1/16 of what the total would be in the 28 cryoweek scenario. Marzia has a plot of the pT dependence of the Y(2S) RAA from the 2023 run in the two scenarios. It makes the point very well. 

Tony

---

From: sPHENIX-l <sphenix-l-bounces AT lists.bnl.gov> on behalf of Gunther M Roland via sPHENIX-l <sphenix-l AT lists.bnl.gov>
Sent: Friday, May 21, 2021 12:43 PM
To: sphenix-l AT lists.bnl.gov <sphenix-l AT lists.bnl.gov>
Subject: Re: [Sphenix-l] sPHENIX updated Beam Use Proposal draft - open for comments

 

Dear Colleagues,

A friendly reminder that comments on the BUP addendum received today would be most useful.

Best,

Gunther and Dave

On May 14, 2021, at 11:07 PM, Jamie Nagle <jamie.nagle AT colorado.edu> wrote:

Hello sPHENIXians,

As you may know, last August 2021 the sPHENIX Collaboration submitted to the Associate Lab Director and the Program Advisory Committee a Beam Use Proposal (BUP) for the years 2023, 2024, 2025 under two scenarios (24 cryo-weeks per year and 28 cryo-weeks per year).   We are now requested to submit an updated BUP under two scenarios (20 cryo-weeks per year and 28 cryo-weeks per year).    The approach is to submit an Addendum (only 10 pages) to the earlier BUP and address what would be done in the 20 cryoweek scenario.    The draft document is available at the following link:

https://indico.bnl.gov/event/11884/

We would benefit from Collaborator input on the "Chapter 1 - Addendum" and would appreciate receiving all comments by Friday, May 21, 2021.     That will give the group time to address the comments and improve the document before final submission.  The final document is due on May 30, 2021 and the PAC meeting is June 22-23, 2021.

The short summary paragraph is included below and so we clearly must work hard to avoid the 20 cryo-week scenario.

"We detail the ramifications of a 20 cryo-week scenario in the following sections, and the broad effects of significantly shorter runs in 2023–2025 can be stated succinctly: there is increased risk to the sPHENIX science program, but particularly in the crucial commissioning year 2023; the entire p+Au run is lost; and there is a significant reduction in the statistics of the signature Au+Au program. We emphasize that many of the core sPHENIX physics measurements can still be made; however, there is substantial increased risk to the entire physics program."

Sincerely,

Jamie 

(for the sPHENIX BUP Taskforce)

Sasha Bazilevsky, John Haggerty, Jin Huang, Dennis Perepelitsa, and ex-officio Dave Morrison, Gunther Roland

Also particular thanks to Ron Belmont and Marzia Rosati

||------------------------------------------------------------------------------------------
|| James L. Nagle    
|| Professor of Physics, University of Colorado Boulder

|| EMAIL:   jamie.nagle AT colorado.edu 
|| SKYPE:  jamie-nagle         
|| WEB:      http://spot.colorado.edu/~naglej  
||------------------------------------------------------------------------------------------

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