Commissioning and running of sPHENIX

[Jamie Nagle <jamie.nagle AT colorado.edu>]

Hello All,

Sending this along for Hugo -- this is good news from Kiel and C-AD.    Hopefully over  the next few  days we  see this  increase in luminosity and have our photon/jet triggers sampling it!

Sincerely,

Jamie

||------------------------------------------------------------------------------------------
|| 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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---------- Forwarded message ---------
From: Hock, Kiel <khock AT bnl.gov>
Date: Sat, May 25, 2024 at 3:54 PM
Subject: Emittance at RHIC
To: Pereira Da Costa, Hugo Denis Antonio <hugo.pereira-da-costa AT lanl.gov>, Lee, Jeong-Hun <jhlee AT bnl.gov>, James L Nagle <naglej AT colorado.edu>, Dunlop, James C <dunlop AT bnl.gov>, Yip, Kin <kinyip AT bnl.gov>

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Hi all, 

I am delighted to inform you the cause of the emittance growth was found and is currently being mitigated. The 56 MHz cavity was driving the growth and changes were made to it to mitigate that. In the next few days we will work to undo the optimizations we had made to the machine to with in the previous configuration and get to a truly optimum machine. For this we will do what we can store to store and will likely request machine development to iron out any lingering issues. We will likely be switching back to 111 bunches in short order. That and the change in emittance, we are looking at a factor of 4-5x increase over our previous luminosities.

I will hold the 0900 meeting on Monday for us to discuss. 

Best,

Kiel