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Tevatron Collider Run II - Doing Shots

Tevatron Collider Run II - Doing Shots. Elvin Harms Fermilab Antiproton Source Harms@fnal.gov X4387. What’s a Shot?. Transferring Antiprotons from the Accumulator to the Tevatron. What’s Shot set up ?. All of the preparatory steps needed to do shots. Accelerator Complex Overview.

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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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