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Efficient Antiproton Shot Set-up at Collider Run II

Dive into the detailed process of setting up antiproton shots at Collider Run II, covering essential steps, tools, and sequences for successful shots, emphasizing automated procedures and reproducibility.

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Efficient Antiproton Shot Set-up at Collider Run II

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  1. Collider Run II - Doing Shots Elvin Harms Fermilab Antiproton Source Harms@fnal.gov X4387

  2. What’s a Shot? • Transferring Antiprotons from the Accumulator to the Tevatron. Ops – Intro to Shots

  3. What’s Shot set up ? • All of the preparatory steps needed to do shots. Ops – Intro to Shots

  4. Accelerator Complex Overview Proton source Antiproton source Tevatron Main Injector Recycler Ops – Intro to Shots

  5. Accelerator Complex Overview Proton source Tevatron Antiproton source AP3 MI-8 AP1 A1 P2 Main Injector Recycler P1 Ops – Intro to Shots

  6. Shot set-up – prerequisites • Previous Store ended • Tevatron at 150 GeV (fringe fields on P1 & P2) • Desired number of antiprotons accumulated Ops – Intro to Shots

  7. Shot set-up – a 3-ring circus Ops – Intro to Shots

  8. Shot set-up – Pbar basic steps • Stop stacking • Cool core • Tune up P1, P2, AP1, AP3 at 8 GeV with Reverse protons • Minimize betatron oscillations in Accumulator • Redistribute core • Unstack and extract 4 bunches nine times • Return to stacking Ops – Intro to Shots

  9. Shot set-up – Sequencer • 6 aggregates • Promotes reproducibility • Automates much of process • Flexible • ‘Pbar Back-up’ for now Ops – Intro to Shots

  10. Shot set-up – Antiproton source tools • Core cooling • RF systems • ARF1, h = 84, – matching to MI • ARF2, h = 2, – stability, squaring • ARF4, h = 4, – unstacking Ops – Intro to Shots

  11. Sequencer – Start Shot Set Up • arm SDA • set up alarms • AP1 from 120 to 8 GeV • AP3 on • Reverse proton TLG • Prompts for MI,P1 -> AP3 tune up • maintain core stability • tranverse emittances • longitudinally Ops – Intro to Shots

  12. Reverse Proton tune up – P143 User-friendly version being developed Start Shot set-up Ops – Intro to Shots

  13. Minimize Accumulator Turn-by-Turn oscillations – P140 Start Shot set-up Ops – Intro to Shots

  14. Sequencer – Set Up… • TLG for Pbars loaded • 4-8 GHz core momentum cooling on • cw ARF2 on • A:EKIK timing for pbars Ops – Intro to Shots

  15. Test shots without beam RF systems play except for unstacking amplitude Verify phase lock Verify timing Verify kicker magnets are working Sequencer – ‘Dry’ Shots Ops – Intro to Shots

  16. Set up ARF2 to shake the core Frequency-modulated 1.25 MHz RF – set interactively Unstack uniform intensity bunches Sequencer – Square Core… Ops – Intro to Shots

  17. Squaring the Core • ‘square’ core allows uniform intensity of pbar bunches Ops – Intro to Shots

  18. Sequencer – Run II Unstacking… • Cooling off • Shutters open • ARF4 set for to unstack • Clock events enabled/disabled for transfer • Unstack/transfer to MI • Cooling back on and wait Ops – Intro to Shots

  19. Unstacking Timing • TCLK $91 to unstack • TCLK $9A prepare to transfer • MIBS $7A (plus delay) to transfer Ops – Intro to Shots

  20. Unstacking • 2.5 MHz (h=4) RF system – ARF4 • 4 bunches at a time • low initial voltage • increase voltage to narrow bunches • lock to MI RF • bunch at 53 MHz (h=84) • extract • ~30 seconds per transfer Ops – Intro to Shots

  21. Unstacking & Extraction • Re-bunch at 53 MHz on extraction orbit • Shuttered fast kicker magnet (1.6ms) Ops – Intro to Shots

  22. Doing Shots • Transfer to MI • Acceleration to 150 GeV • coalescing Ops – Intro to Shots

  23. Doing Shots • Coalescing • 4-53 MHz bunch trains into 4-2.5 MHz bunches Ops – Intro to Shots

  24. Sequencer - Return to Stacking • Close out SDA • Re-cool beam into core • Set up alarms for stacking • Timing reset for stacking • AP3 off • AP1 set to 120 GeV • RF systems and diagnostics reset for stacking Ops – Intro to Shots

  25. Important Tools • Sequencer • Time Line Generator (TLG) • Dedicated Applications • CDA/SDA Ops – Intro to Shots

  26. Unique Applications • P140 – VSA TBT • P142 – VSA Acc Long Prof • P143 – APX. Lattice (Beam line tuner) • P185 – Emittance Calc • P186 – AP0 Scope Ops – Intro to Shots

  27. Important Tools • Sequencer • ACNET application • Automates much of the process • Flexible • Interactive Ops – Intro to Shots

  28. Important Tools • Time Line Generator (TLG) • central Beam switching system • who gets what beam when and how often • different Timelines for different modes • Shot set up • Load protons • Load pbars Ops – Intro to Shots

  29. Important Tools • Dedicated Applications • Beam line tuning • Orbit display and control • RF and stochastic cooling systems • Diagnostic display • Parameter pages Ops – Intro to Shots

  30. Important Tools • CDA/SDA • Gather, display, and analyze data from shots • State-based • Java applications Ops – Intro to Shots

  31. Armchair Shooter • How to watch? • Channel 13/Notify • Pbar TV channel 7 – AP1 wall current monitor • Pbar TV channel 15 – Accumulator Vector Signal Analyzer • Pbar TV channel 16 – Accumulator unstacking display • Pbar TV channel 18 – Accumulator Vector Signal Analyzer • Pbar TV channel 28 – Accumulator Stack (longitudinal) Profile Ops – Intro to Shots

  32. Summary • Tools are in place for Run II operation • Refinement still in progress • We’re still learning how to do shots • Work with us! Ops – Intro to Shots

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