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RHIC pp 500 GeV development

This report outlines the progress made during the RHIC 500 GeV development, detailing achieved milestones such as successfully accelerating both beams up to 250 GeV and measuring significant polarization in the Blue ring. Key studies included the polarization as a function of beam tunes and energy during ramps. However, challenges arose, including unexpected strong coupling between energy levels and system failures that led to significant downtime, particularly due to weather-related issues, which hindered full achievement of the 250 GeV goals.

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RHIC pp 500 GeV development

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  1. RHIC pp 500 GeV development M. Bai C-A Department

  2. Fix the rf ring to ring synchro Yellow ps lead flow problem Blooster problem, ps problem Weather related down time Ps problem, access control problem ps work ps problem, access control problem Quench recovery Blooster problem Blooster problem

  3. What did we achieve • Successfully accelerated both beams up to 250 GeV • Significant polarization was measured at 250 GeV in Blue ring • Studied the polarization as a function of beam tunes at 250 GeV • Measured polarization as a function of energy during the last two ramps.

  4. Resonance at Ggamma=138

  5. What did we miss • Systematic study of polarization along the energy ramp as function of orbit distortion and beam tunes at depolarization resonances beyond 100 GeV • Establish collisions to study the luminosity aspects at 250 GeV • Study the polarization lifetime as a function of beam tunes at 250 Gev

  6. What prevented up from fullfiling the goal of 250 GeV developement • An unexpected strong coupling between 200 GeV and 250 GeV • Downtime due to system failures • Lost a total of 36 hours due to bad weather. Lost another 4 hours due to system failures during the 12 hour extension • A combination of yellow ps problem and rf loop problem, both were weather related, also prevented any polarization development in the Yellow ring

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