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Accelerator Improvements in the NOvA and Mu2e Era

This seminar discusses enhancements in the accelerator system for increased protons delivery to support experiments like NOvA and Mu2e, focusing on the efficient utilization of available resources and novel schemes for beam transfer and extraction. The timeline, strategies, and technical parameters involved in these improvements are outlined to optimize beam delivery and experimental outcomes.

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Accelerator Improvements in the NOvA and Mu2e Era

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  1. NOnA time line improvements 300 kW 700 kW Eric Prebys, Jefferson Lab Accelerator Seminar

  2. Extra protons: NOvA era MI uses 12 of 20 available Booster Batches per 1.33 second cycle Roughly 8*(4x1012 batch)/(1.33 s)*(2x107 s/year)=4.8x1020 protons/year available Preloading for NOvA Recycler Recycler  MI transfer Available for 8 GeV program 15 Hz Booster cycles MI NuMI cycle (20/15 s) Eric Prebys, Jefferson Lab Accelerator Seminar

  3. 8 GeV protons: “Boomerang” Scheme • Deliver beam to Accumulator/Debuncher enclosure with minimal beam line modifications and no civil construction. MI-8 -> Recycler done for NOvA Recycler(Main Injector Tunnel) New switch magnet extraction to P150 (no need for kicker) Eric Prebys, Jefferson Lab Accelerator Seminar

  4. Energy T=0 1st batch is injected onto the injection orbit T<66ms 1st batch is accelerated to the core orbit T=67ms 2nd Batch is injected 2nd Batch is accelerated 3rd Batch is injected Momentum stacking in accumulator • Inject a newly accelerated Booster batch every 67 mS onto the low momentum orbit of the Accumulator • The freshly injected batch is accelerated towards the core orbit where it is merged and debunched into the core orbit • Momentum stack 3-4 Booster batches • They are then transferred to the Debuncher, where they can be rebunched, slow extracted according to experimental needs. T<133ms T=134ms Eric Prebys, Jefferson Lab Accelerator Seminar

  5. beam structure for Mu2e • Eliminate prompt beam backgrounds by using a primary beam with short proton pulses with separation on the order of a muon life time • Optimum period just happens to be exactly the period of the Debuncher. • Plan: rebunch into into a single bunch and slow extract to experiment. ~100 ns ~1.5 ms Prompt backgrounds live window Eric Prebys, Jefferson Lab Accelerator Seminar

  6. Rebunching in Accumulator/Debuncher Momentum stack 6 Booster batches directly in Accumulator (i.e. reverse direction) Capture in 4 kV h=1 RF System. Transfer to Debuncher Phase Rotate with 40 kV h=1 RF in Debuncher Recapture with 200 kV h=4 RF system st~40 ns Eric Prebys, Jefferson Lab Accelerator Seminar

  7. Exploit 29/3 resonance Extraction hardware similar to Main Injector Septum: 80 kV/1cm x 3m Lambertson+C magnet ~.8T x 3m Resonant Extraction Eric Prebys, Jefferson Lab Accelerator Seminar

  8. Timeline in NOvA/Mu2e era Eric Prebys, Jefferson Lab Accelerator Seminar

  9. Accumulator/Debuncher parameters+ +MU2E-DOC-72 E. Prebys – mu2e beam meeting

  10. Extinction Channel Concept E. Prebys – mu2e beam meeting

  11. Amplitude requirement At collimator:

  12. At magnet Phase space (live window t): Full amplitude:

  13. Peak Field and Stored Energy • Use A=50p mm-mr, t=200 ns

  14. Magnet Aperture

  15. Proposed Parameters for Development

  16. Extinction Channel Design* *MU2E-DOC-74 E. Prebys – mu2e beam meeting

  17. Preliminary Beam Line Layout • Symmetric about 2m collimator with • bx = 50m, by= 1m, mx = .25 (at collimator center) • Shortest line which fits constraints (32 m) • Small bx (7.9 m) means small hole (x/y = 1.29 x 2.54 cm) E. Prebys – mu2e beam meeting

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