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All Experimenter’s Meeting

All Experimenter’s Meeting. Improvements in Pbar transfers to the Recycler. Jim Morgan, June 15, 2009. Recycler Purpose. The Recycler Ring TDR in November 1996 says: Improve luminosity performance X2-3 by… Create antiprotons at a faster rate Storing antiprotons more reliably

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All Experimenter’s Meeting

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  1. All Experimenter’s Meeting Improvements in Pbar transfers to the Recycler Jim Morgan, June 15, 2009

  2. Recycler Purpose • The Recycler Ring TDR in November 1996 says: • Improve luminosity performance X2-3 by… • Create antiprotons at a faster rate • Storing antiprotons more reliably • Recycling antiprotons remaining in the Tevatron at the end of a store

  3. Recycler Milestones • Commissioning • May 1999 – First circulating protons • November 2000 – First circulating pbars • Operation • January 2004 – First transfers to Tevatron (12E30cm-2s-1) • June 2004 – First “mixed mode” transfers to Tevatron • January 2005 – Routine “mixed mode” transfers • July 2005 – Pbars cooled with electron cooling • October 2005 - Routine transfers from Recycler only

  4. Improvements in pbar transfers to Recycler • Pbar transfers to the Tevatron shift from Accumulator to Recycler in FY2005 • 89% median Accumulator to Recycler transfer efficiency • Stacking interruption for transfers 40-60 minutes • Target stack size for transfers 60-80E10 • Minimal progress at improving transfers prior to Spring 2006 shutdown • Major effort put into improving the stacking rate • After start-up in Summer 2006, more effort put into improving transfers • Task Force formed in September 2006 • Goal of >95% transfer efficiency and <1 minute stacking interruption

  5. Task Force strategy • Greatly reduce interruption to stacking • Move as many set-up steps as possible to time before stacking stops • Eliminate long periods with dedicated MI cycles for tune-up • Take advantage of ACL scripts to speed up tasks • Ultimate goal to only interrupt stacking during beam transfers • Challenges: ramp AP-1 power supplies, faster unstacking sequence, major software overhaul, etc. • Improve transfer efficiency • Improve aperture with better steering and optics • Shorten RF bunches in Accumulator to minimize effects of ringing Accumulator injection kicker • Build Pbar injection damper for MI to reduce oscillations • Improve optics match between beamlines and MI • Reduce Accumulator emittances • Challenges: Small aperture magnets in AP-1, power supplies for AP-1 don’t invert, Pbar BPM system needed, larger emittances, etc.

  6. Monthly Integrated Luminosity and Pbars sent to the Recycler

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