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Main Injector For Collider Run II

Main Injector For Collider Run II. February 8, 2001 Denton Morris dmorris@fnal.gov. The Many Hats of the Main Injector. Stacking: 120 GeV protons to the Antiproton Source target Shots: 150 GeV protons to the Tevatron Shots: 150 GeV antiprotons to the Tevatron

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Main Injector For Collider Run II

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  1. Main Injector For Collider Run II February 8, 2001 Denton Morris dmorris@fnal.gov

  2. The Many Hats of the Main Injector • Stacking: 120 GeV protons to the Antiproton Source target • Shots: 150 GeV protons to the Tevatron • Shots: 150 GeV antiprotons to the Tevatron • Shot setup: 8 GeV protons (reverse) to the Accumulator • Shot setup: 150 GeV protons to the Tevatron • Recycler commisioning • NUMI • MiniBoone • 120 GeV Fixed Target

  3. Keeping Track of what’s going on • Notify – new and improved… • 2D 8 GeV protons • 29 120 GeV for Pbar production • 2A 150 GeV antiproton transfers • 2B 150 GeV proton transfers 9 9 9 9 9 9 9 9 D A D B D A D

  4. 8 GeV Protons from Booster • All 8 GeV protons originate from the Proton Source • PreAcc • Linac • Booster • MI-8 line

  5. Acceleration to 120 GeV for Antiproton Production • 84 bunches (one Booster batch) of 8 GeV protons from the Proton Source are accelerated to 120 GeV and extracted from the Main Injector down the P1, P2 and AP1 lines to the Pbar target at AP0 • P1, P2 and AP1 line running in 120 GeV mode

  6. 150 GeV Protons for Tevatron • Nine batches of 11 bunches from Booster • Accelerated to 150 GeV • Coalesce 9 batches of 11 into 9 single bunches • Bucket to bucket transfer to TeV • P1 line running in 150 GeV mode

  7. Coalescing • Building a bigger bunch

  8. Coalescing • 53 MHz bunch structure h=588 • Overlay 2.5 MHz RF h= 28 and 5 MHz h=56 • Remove 53 MHz • Allow bunches to rotate • Recapture with 53MHz

  9. 150 GeV Proton Coalescing

  10. 8 GeV protons for beamline and Acculumator Shot Setup • Low intensity to approximate antiprotons • P1, P2, AP1 and AP3 lines running 8 GeV mode

  11. 150 GeV Antiprotons for Tevatron

  12. 150 GeV Antiprotons for Tevatron • 8 GeV in, 150 GeV out • Coalesce 4 batches of 11 bunches into 4 bigger bunches • Beamline gymnastics • P1, P2, AP1 and AP3 beamlines running 8 GeV • A1 line running 150 GeV • P1/A1 load switching

  13. Antiproton Coalescing • The four batches of 9 bunches are coalesced into 4 big bunches • Similar to proton coalescing

  14. 150 GeV Antiprotons for Tevatron

  15. Beamline Gymnastics • Antiproton transfers to Main Injector • P1, P2, AP1, AP3 running 8 GeV for Accumulator to MI • Antiprotons from Main Injector to TeV • A1 line running 150 GeV • Problem: P1 and A1 lines use the same power supplies with load switches.

  16. Beamline Gymnastics • Power supplies start at 8 GeV level with load switches to P1 • After injection power supplies ramp down • Load switches switch to A1 line • Power supplies ramp to 150 GeV for transfer • Power supplies ramp back down and switch back to P1 loads

  17. Where Are We Now? • Protons for collisions • Coalescing 7 bunches (200e9 ppb) • 1 bunch at a time (we have done two) • ~80% efficient • Longitudinal emittance ~3.2 eV-sec • Need to understand the emittance growth that occures before coalescing • Transverse emittance blows up during transfers

  18. Where Are We Now? • Antiprotons for Collisions • 30e9 pbpb (60mA stack) • >90% efficiency • Transverse emittance growth during Accumulator to Main Injector transfer

  19. Where Are We Now? • 120 GeV protons for antiproton production • 4.5e12 protons on target (5e12 by June ’01) • Production cycle time 1.46 seconds

  20. Final Results? • 400 pb-1 by Spring 2002

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