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Tevatron Collider Run II - Doing Shots

Learn the meticulous process of transferring antiprotons, preparing shots, and executing critical steps in the Tevatron Collider's Run II. Explore the detailed setup of the CDF shots, from the proton source to the superconducting synchrotron. Discover how shots are initiated, including considerations for antiproton handling and streamlining the core for maximum efficiency. Dive into the technical tools and applications crucial for orchestrating shots successfully. Stay informed on essential equipment and processes like sequencers, timeline generators, and dedicated applications. Witness the action unfold with the Armchair Shooter program, allowing real-time monitoring of the shot execution through various channels. Enhance your understanding of the complex and fascinating world of particle acceleration at Fermilab's Tevatron Collider.

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Tevatron Collider Run II - Doing Shots

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  1. Tevatron 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. CDF – Intro to Shots

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

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

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

  6. Accelerator Complex Overview • Proton source • Cockroft-Walton preaccelerator 750 keV CDF – Intro to Shots

  7. Proton source Drift tube Linac 116 MeV Proton source Side-coupled cavity Linac 400 MeV Accelerator Complex Overview CDF – Intro to Shots

  8. Accelerator Complex Overview • Proton source • Rapid-cycling Booster synchrotron 8 GeV CDF – Intro to Shots

  9. Accelerator Complex Overview • Main Injector/Recycler 8 to 150 GeV CDF – Intro to Shots

  10. Accelerator Complex Overview • Antiproton source • Antiproton production target station 120 GeV • Debuncher 8 GeV • Accumulator 8 GeV CDF – Intro to Shots

  11. Accelerator Complex Overview • Tevatron • Superconducting synchrotron 980 GeV CDF – Intro to Shots

  12. Shot set-up – prerequisites • Previous Store ended • Tevatron at 150 GeV • Desired number of antiprotons accumulated CDF – Intro to Shots

  13. Shot set-up – a 3-ring circus CDF – Intro to Shots

  14. Shot set-up - Tevatron • Back to 150 GeV • Reverse injection to MI CDF – Intro to Shots

  15. Shot set-up – Main Injector • Orbit/tunes set • Reverse protons to Pbar • Protons to Tevatron CDF – Intro to Shots

  16. Shot set-up – Antiproton source • ‘cool’ the core • maintain stability • tranverse emittances • longitudinally • tools • Stochastic cooling • Stabilizing RF • dampers CDF – Intro to Shots

  17. Reverse Proton tune up Shot set-up – Antiproton source CDF – Intro to Shots

  18. Minimize Accumulator Turn-by-Turn oscillations Shot set-up – Antiproton source CDF – Intro to Shots

  19. Test shots without beam RF systems play except for unstacking amplitude Verify phase lock Verify timing Verify kicker magnets are working Shot set-up – ‘dry’ shots CDF – Intro to Shots

  20. Squaring the core Frequency-modulated 1.25 MHz RF Unstack uniform intensity bunches Shot set-up – Antiproton source CDF – Intro to Shots

  21. Doing Shots • Load protons • Unstack from core • Pbars to MI • Accelerate to 150 GeV & Coalesce • Transfer to Tevatron/cog CDF – Intro to Shots

  22. Doing Shots • Unstacking • ‘square’ core allows uniform intensity of pbar bunches CDF – Intro to Shots

  23. Doing Shots • Unstacking • 2.5 MHz (h=4) RF system • 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 CDF – Intro to Shots

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

  25. Doing Shots • Transfer to MI • Acceleration to 150 GeV • coalescing • another talk CDF – Intro to Shots

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

  27. Doing Shots • Transfer to the Tevatron • another talk CDF – Intro to Shots

  28. Tevatron Loading scheme • Antiprotons are loaded four bunches at a time for a total of 9 transfers from the Accumulator to MI to the Tevatron • The 36 bunches of Pbars are equally spaced in 3 groups of 12 around the Tevatron CDF – Intro to Shots

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

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

  31. 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 CDF – Intro to Shots

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

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

  34. 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 CDF – Intro to Shots

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