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The Story So Far

This document details recent experiments in physics focusing on tuning rings for increased intensity. Discusses ongoing maintenance, adjustments, and challenges faced during the process. Examines the impact of orbit effects and store tunes on the experiments. Future plans include enhancing injection measurements and implementing strategies to ensure stable orbits and high jet values.

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The Story So Far

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  1. The Story So Far Cold in both rings 4K Wave PP12 lattice test evening PS work during Day Overnight Stores 109x109 PS gave us e-lens First Collisions Start Physics

  2. LIPA Maintenance 6 hour stores with tune between LIPA Maintenance 8hr Stores APEX Inject =200e11

  3. Maintenance Switch Fy12 Lattice Pushed Intensity Reach 200e11 At FT Rotator Tuning APEX Maintenance MD Studies Golden Store 17396 Pushed Bunch Intensity APEX Machine Dev. APEX Machine Dev. Test corrected Optics

  4. MD Studies Installed Dpx APEX Maint. Dpx reduction In Blue removed MD Spin Tune Low E APEX

  5. Past week • Machine Development • Spin Tune Verified for Blue Ring • Studies of RF bunch-by-bunch phase • Booster Ground Fault • Trouble with Aborts • Both Blue and Yellow lower Jet values

  6. Current Situation • For past several fills Blue Jet numbers have been in high 40's to low 50's. • Yellow has also seen some dramatic variation spiking up to 65% and down to 46% • Some indications that these are related to orbit • Yellow Emittance has played a role • Store tunes • We are still trying to understand nature of the orbit effect

  7. STAR Horizontal Orbit

  8. PHENIX Orbit Horizontal

  9. Yellow STAR Horizontal Orbit

  10. Yellow PHENIX Horizontal Orbit

  11. Future Plans • Eliminating Injection Pol. Measurements • Going to 15hr Stores to Save abort kicker • Try an control orbits keep them in place where we have seen high Jet values.

  12. Spin Flipper APEX APEX Low Energy End of Run

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