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  • From: Gunther M Roland <rolandg AT mit.edu>
  • To: "sphenix-l AT lists.bnl.gov" <sphenix-l AT lists.bnl.gov>
  • Subject: [Sphenix-l] Important Run 24 updates - start of 4k wave on April 15
  • Date: Sat, 13 Jan 2024 00:38:46 +0000


Dear Collaborators,

We would like to update you on important developments regarding the Run 24 schedule. We are now expecting final RHIC cooldown ("4K wave") to start on April 15, with first collisions expected towards the end of April.

This shift by 6 weeks compared to the prior planned date for the 4k wave, March 4, was requested by us in meetings with RHIC management (Jan 11) and RHIC and C-AD leadership (Jan 12), following discussions at last week's Operations Board meeting and the EC meeting this Wednesday. The motivation for this request is to make optimal use of the limited number of cryo-weeks available in Run 24 (our default assumptions are 20 weeks of pp running and 6 weeks of AuAu running). 

We continue to expect TPC mitigation work and reassembly of the detector to conclude by mid-March (on March 11, according to the latest schedule). The delay in the 4K wave will allow us to perform essential systems-tests of detectors and DAQ following detector reassembly before start of the cryo-week clock beam, preserving as much time for physics as possible.

Following today's meeting with RHIC/C-AD leadership, this request was communicated and approved by DOE NP, and communicated BNL leadership and STAR as well. With 20+6 cryo-weeks, this puts the end of Run 24 at October 14, i.e., past the FY24/25 boundary. This was explicitly noted and approved. It was also acknowledged that depending on the length of this year's shutdown and the length or Run 25, this may put the end of Run 25 past the previously discussed Jun 30 2025 date.

Many thanks to all that provided advice regarding this important request. We believe that this change significantly improves our chances to reach our pp luminosity goals, but much work lies ahead and we need to continue our push for detector readiness on the tight schedule that we have laid out. You will soon receive further communication regarding the detailed schedule and implications for, e.g., the shift schedule.

Please let us know if you have any questions.

Best,

Gunther and Dave




  • [Sphenix-l] Important Run 24 updates - start of 4k wave on April 15, Gunther M Roland, 01/12/2024

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