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RHIC Status Update

Declared physics Friday, Feb 10 Smooth running over the weekend (incremental ramp-by-ramp improvements to ramp/store conditions T ight constraints on the longitudinal emittance Successful ramps with 109 bunches depend on small longitudinal emittance

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RHIC Status Update

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  1. Declared physics Friday, Feb 10 • Smooth running over the weekend (incremental ramp-by-ramp improvements to ramp/store conditions • Tight constraints on the longitudinal emittance • Successful ramps with 109 bunches depend on small longitudinal emittance • Loss monitor permit pulls on ramp and rebucketing traced back to large momentum spread. • Longitudinal matching at RHIC injection is critical • Can we do better in the injectors? • Rebucketing loss was limiting intensity to 96 bunches at 1.3e11 • Can now do 109 at 1.3e11 with better longitudinal matching, will begin pushing per bunch intensity again RHIC Status Update Time Meeting, V. Schoefer 2/14/12

  2. RHIC Status Update Time Meeting, V. Schoefer 2/14/12 • Speed bumps • Still trying to understand carbon polarimeter noise problem • Phase shifter cost about a shift (now disconnected from lattice) • BBQ tune measurement ring to ring crosstalk • Definitely beam-based, but not completely understood • Tune feedback in this state causes the tune quads to walk away • Requires a small tune separation between the two rings • No automatic longitudinal matching available (yet) • Human error • Failed attempt to optimize orbit angles • Two ring QLI from FEC reboot: ambiguous dialog box warning

  3. Misguided steering (hum err) Incorrect FEC reboot (hum err) Fixing yel lifetime Phase shifter QLIs Blue H<->V locking at dQ= 1e-3 Yellow loss permit at rebucketing

  4. Optics and rebucket YA1 Trip BLM Threshold Problem Ramp and Reb. Loss

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