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7.7 GeV Low Energy Program

Get the latest updates on the 7.7 GeV Low Energy Program at AGS. Discover the progress made in beam development, turnaround times, and facility-wide losses. Learn about the recent sextupole polarity reconfiguration and the impact on beam lifetime. Stay informed about the ongoing efforts to improve beam intensity and integrated luminosity.

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7.7 GeV Low Energy Program

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  1. 7.7 GeV Low Energy Program • Into the home stretch of four-week scheduled run • 10 minute stores, with APEX and beam development • Turnaround times about 2 minutes to second beam • Still in physics 75-80% of wall clock time • Operations have continued to excel at turnaround • Gap cleaning, improvements in injection matching… • Yellow injection kicker vacuum failure • Understood as unusual corrector failure • Integrated beam loss permits in place • Continuing to monitor facility-wide losses, chipmunks • Sextupole polarity reconfiguration • Half of sextupoles at defocusing quads were reversed • Demonstrated additional ability to set chromaticities • Modest improvement to beam lifetime • Important for E=2.5 GeV/u test on Monday Time Meeting T. Satogata

  2. Store Turnaround • Very regular stores: • 800s cycle time, ~180s between stores = 78% physics time • 10 minute stores significantly improve integrated lumi Time Meeting T. Satogata

  3. Sextupole Reversal • Sextupole reversal results • Beam decay significantly improved by adjusting chroms • Leads to higher initial intensities and integrated luminosities Time Meeting T. Satogata

  4. 7.7 GeV Beam Intensity AGS RF KL fan failure ODH Sensor ODH Sensor • Fairly steady improvement over past week • Blue injection intensity development work continues • More frequent orbit correction, collimator adjustments APEX E=2.5 GeV beam development Sextupole reversal Yellow inj kicker vac break Time Meeting T. Satogata

  5. 2.5 GeV Beam Intensity Four Hours 0.16 • Mon May 17: Established 2.5 GeV/u beam in both rings (8 hrs) • A good place to start for RF capture next time… 0.05 Time Meeting T. Satogata

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