Commissioning and running of sPHENIX

["Pereira Da Costa, Hugo Denis Antonio" <hugo.pereira-da-costa AT lanl.gov>]

All,

 

See message below from CA-D about RHIC luminosity.

A x4/x5 increase in instantaneous luminosity is expected soon, which is excellent news. To us now to make the best of it.

 

Hugo

 

From: Hock, Kiel <khock AT bnl.gov>
Sent: Saturday, May 25, 2024 1:54 PM
To: Pereira Da Costa, Hugo Denis Antonio <hugo.pereira-da-costa AT lanl.gov>; Lee, Jeong-Hun <jhlee AT bnl.gov>; Nagle, James <Jamie.nagle AT colorado.edu>; Dunlop, James C <dunlop AT bnl.gov>; Yip, Kin <kinyip AT bnl.gov>
Subject: [EXTERNAL] Emittance at RHIC

 

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