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RHIC Status and Plans

RHIC Status and Plans. RSC Meeting 3/23/12 V. Schoefer. RHIC Status. Good news: We came very quickly to near last year’s peak performace Bad news: Appears to be exactly last year’s performance Golden store 16602: Peak lumi 130 10 30 cm -1 s -1 , 1.5e11/bunch

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RHIC Status and Plans

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  1. RHIC Status and Plans RSC Meeting 3/23/12 V. Schoefer

  2. RHIC Status • Good news: We came very quickly to near last year’s peak performace • Bad news: Appears to be exactly last year’s performance • Golden store 16602: • Peak lumi 130 1030 cm-1s-1, 1.5e11/bunch • ZDC emittance: 23 pi mm mrad • Lumi Lifetime comparable to Run 12 • Assuming a small increase in intensity at store to 1.65e11 and this is slightly better than peak performance last year (lumi would be ~160 compared with Run11 145 s.u) • Polarization (B, Y) ~ (48%, 44%), averaging all available longitudinal Jet numbers, though not really the same conditions

  3. Polarization • Energy ramp transmission • Snake rotation magnitude scan • Run11 rotation angle scans showed little effect • Have not tried to adjust the magnitude of the rotation (could be off from 180 degrees) • Could also affect store lifetime • Orbit harmonic compensation (APEX)

  4. Polarization • Rotator ramp transmission • (see Elke’s presentation for pC data) • May account for systematic difference between blue and yellow at 255 GeV • Spin manipulation may not be local to the IP • Change both rotators of one color at one IP by a large amount, local pol at the other experiment and pC should see no change in direction (change in magnitude might result from depolarization during current change) • This could also contribute to polarization lifetime

  5. Polarization • Store lifetime • Suggestive indication on one store that when snake angle in yellow drifts, polarization lifetime suffers, can scan store-to-store. Adjusts the spin tune, which may be shifted by another source • Spin tune measurement at store with AC dipole

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