1. Cons Gattuso 2/23/10 Status/Changes to Pbar Transfer Program

2. 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 (currently.25) minute stacking interruption- Accomplished in earlier FY10.

3. Rapid Transfer 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.  Reached limitation  Human interface is now becoming the limiting factor

4. Pbar Stacking Rate Improvements 35 mA 25 mA 26.3 mA/hr 27.3 mA/hr

5. Instructed to transfer at 25 ma More like 29 ma Difference would be ~1-1.5ma/Hr

6. Pbar Transfer to the Recycler  The next leap forward in the transfer process  Full automation (development of Master Process) What does that mean? Pbar Source: Default mode is the Pbar Stacking/Transfer mode –One shot away from transfer –Items that will need to be addressed »Sequencer changes: minor »Dead recon pick up point: Done »Incorporating Reverse proton tunes ups: Simple Recycler: Always ready to receive Pbars »Automation of compression process -Done »Rework the RF unwind process – After Tevatron Shot »Recycler beam parameters determine when to transfer

7. FSM Flow chart A.R.T Accumulator to Recycler Transfers Transfer Criteria PB Stack Size PB/RR Emmitt Criteria Beam sum permit RR Bunch Length RR Target Intensity RR Emmit Criteria Recycler Pbar Source Mode Stacking Transfer Standby Mode Stashing Transfer Standby Mater Flags Number of Transfers: 2 Master on/off Retune Flag Transfer Eff > 93%  Mechanics have been tested, Ops are/will be working on the interface.

8. FSM Checks flag conditions Pbar device check Handles SDA/shots log opening and closing RR injection and Merger One shot issuing

9. Parameters  PB Stack Size  Accumulator Stack size we will shot from  PB/RR Emmitt Criteria (one or two parmeters)  Looks at both the Recycler and Accumulator Data obtained from 1000’s of eff will dictate this value to max eff  Beam sum permit  Looks at ACC, MI, Beam line and Recycler Beam permits  Faster response such that we don’t loss Pbars in transit. Recent we have had 2-3 of these in the last 2-4 weeks  RR Long emittance  Set upper and may be a lower limits  RR Target Intensity  Target RR stash size for next HEP shot

10. Recent Advances in FSM capabilities  FSM upgrades  ACL scripts Hooks Use existing scripts to hand transfers  Error Handling Error handling –Program Logs –Real time error reporting  Parallel process RR does its thing Acc does its thing Come together for the transfer

11. Sequencer changes  RR and ACC sequencer changes  Both will need to be a version of the “Setup ART mode” sequence  Both will need a “Recover from ART” sequence  Current sequencer aggregates will remain as is to handle manual transfer mode.

12. Operational Scenario  Collider shot  RF unwinding  Pbar transfer to RR  1 st set of transfer “Manual” Pbar Transfer Use the current set of aggregates to get us into this mode  ART mode As long criteria are meet continue the process If they are NOT meet

13. Where we stand  SDA/Shots Log  Tested during shut down Opened/closed/ and took data  Mechanics  Striped down version Issued TLG one-shot Ran RR RF states  Interface  Operations group Brian Schupbach

14. Target Stack Size  Effective Pbar Production Rate  Dependent on Pbar Source base stacking Rate Stacking rate as a function of stack size Amount of beam in stacktail  Transfer Efficiency between the Accumulator and the Recycler  Lifetime in Both the Accumulator and the Recycler Function of Recycler Stash size and Pbar Stack size -Gattuso 14