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Tevatron Issues and Operations

Tevatron Issues and Operations. All Experimenter Meeting Dean Still Monday, February 22, 2010. Collider II Integrated Luminosity. Courtesy: RunCo Team 0900 meeting Feb, 19, 2010. Currently Limiting Pbar Intensity due to Losses in Squeeze. Requesting lower pbars due to losses

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Tevatron Issues and Operations

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  1. Tevatron Issues and Operations All Experimenter Meeting Dean Still Monday, February 22, 2010

  2. Collider II Integrated Luminosity Courtesy: RunCo Team 0900 meeting Feb, 19, 2010 Tevatron Issues and Operations

  3. Currently Limiting Pbar Intensity due to Losses in Squeeze Requesting lower pbars due to losses In Squeeze and Collisions Tevatron Issues and Operations

  4. Problems • Losses at LMB1SD (~29rads/sec – quench ~50rads/sec) remain high during squeeze LBSEQ 7-14. • Pbar vertical emittance blow up at and pbar beam loss at end of squeeze LBSEQ 21-25. • Pbar vertical emittance blow up at and pbar beam loss at Initiate Collisions. Tevatron Issues and Operations 4

  5. Current Problems April 6955 7611 7612-14 Changes to End of squeeze 7615 Pbars falling out Pbar vert emittance growth Tevatron Issues and Operations

  6. Losses at B0 (LMB1SD) in squeeze Quench Stores last April Current stores Tevatron Issues and Operations

  7. Losses at C0 (LMC4SM) in squeeze Current stores Stores last April Quench Tevatron Issues and Operations

  8. Pbar Losses at D0 (LMC492) in squeeze Stores last April Current stores Quench Tevatron Issues and Operations

  9. Compare Pbar beam loss in the Squeeze Last April current Tevatron Issues and Operations

  10. Compare Proton beam loss in the Squeeze Last April current Tevatron Issues and Operations

  11. Separator scans MOS store 7606- D0 lum increased ~2% and CDF/D0 ratio went from ~5% to 3% Lowered Pbar tunes at lbseq 25 (due to Scalloping) Evened out S7 table at lbseq 21-24. B0 VANG bumps lbseq[2-24] to explore B0 pipe aperture. Studies/Work Completed Tevatron Issues and Operations 11

  12. Test of air flow from D0 hall to tunnel and possible Lowbeta Quad roll Turned on fan in tunnel. D0 IP pos moved By ~ 100 um. Orbit stabilization Changed HC49 by ~ 2amps Possible for orbit errors Store to store D0 X IP Pos HC49 Tevatron Issues and Operations

  13. Separator Scan CDF/D0 Lum ratio CDF/D0 Lum ratio • Separator scans MOS store 7606 • D0 lum increased ~2% • CDF/D0 ratio went from ~5% to 3% difference. CDF Lum Sept 2009 Tevatron Issues and Operations

  14. Summary • Tevatron has requested lower pbar intensities ~ 400E10 to shoot from based on losses around B0 during the early squeeze. • Tevatron currently has pbar vertical emittance growth at the end of the low beta squeeze and initiate collisions which is effecting initial luminosity. Tevatron Issues and Operations

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