1 / 7

Progress Update on 7.7 GeV Low Energy Program: Operations and Challenges

The 7.7 GeV Low Energy Program enters the final stretch with efficient operations and 10-minute stores. Turnaround times are around 2 minutes to the second beam, ensuring over 80% physics time. Ongoing gap cleaning and BLM permits continue to support operations. While yellow beam intensity remains stable, blue beam intensity dropped over the weekend. The PHENIX collision rate is consistent with low backgrounds, while the STAR VPD rate fluctuates. Efforts are focused on maintaining beam intensity and managing orbit corrections amidst ongoing challenges.

finnea
Télécharger la présentation

Progress Update on 7.7 GeV Low Energy Program: Operations and Challenges

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 7.7 GeV Low Energy Program • Into the *real* home stretch of the 7.7 GeV run • still 10 minute stores :) • Turnaround times about 2 minutes to second beam • Still in physics 80%+ of wall clock time • Operations have continued to excel at turnaround • Gap cleaning still running, BLM allowed to pull permit • with beam position at STAR at -8 mm no more regular orbit corrections • yellow beam intensity pretty constant, blue dropped over the weekend and didn't recover yet :( • PHENIX collision rate constant, not much background (BBC LL1) • STAR VPD rate varies

  2. blue intensity last week APEX AGS chiller, LLRF STAR magnet trip 45 e9 maintenance we are fighting low blue injection intensity we keep trying ...

  3. yellow beam intensity last week 65e9 maintenance

  4. STAR vertical orbit moved • being so far off-center makes it very sensitive to even small changes in the orbit (aka orbit corrections)

  5. STAR backgrounds .... hysteresis .... permanent work in progress !

  6. STAR Luminosity ... work in progress too

  7. Summary since May 12th beam intensity vs. date Lumi vs. date

More Related