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Enhancements in Pbar Transfers to the Recycler: Insights from the 2009 Experimenter’s Meeting

This document summarizes the key improvements discussed at the 2009 Experimenter’s Meeting regarding Pbar transfers to the Recycler. The aim is to enhance luminosity performance by increasing the antiproton production rate and improving storage reliability. The meeting highlights milestones, including the first successful transfers to the Tevatron and detailed strategies for achieving transfer efficiency exceeding 95%. The challenges and strategies employed in optimizing the transfer process, minimizing stacking interruptions, and enhancing the overall efficiency of the Recycler system are explored.

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Enhancements in Pbar Transfers to the Recycler: Insights from the 2009 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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