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Funneling p ’s and m ’s

Funneling p ’s and m ’s. Bruno Autin, Peter Sievers, Andr é Verdier CERN Fran çois Méot CEA, Saclay. Proton Beam Parameters. Why a funneling system?. No exotic and expensive technology. Lifetime in excess of one year. Evolutionary design. How it works?.

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Funneling p ’s and m ’s

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  1. Funneling p’s and m’s Bruno Autin, Peter Sievers, André Verdier CERN François Méot CEA, Saclay NuFact03, June 04 -11, New York Funneling pions and muons.

  2. Proton Beam Parameters NuFact03, June 04 -11, New York Funneling pions and muons.

  3. Why a funneling system? • No exotic and expensive technology. • Lifetime in excess of one year. • Evolutionary design. NuFact03, June 04 -11, New York Funneling pions and muons.

  4. How it works? • The proton beam is switched to 4 targets in sequence. • Each of the 4 pion lines contains an integrated system of target, magnetic horn and cooling. • The funnel is made of large aperture magnets with quadrupolar and pulsed dipolar coils. NuFact03, June 04 -11, New York Funneling pions and muons.

  5. Funneling step by step NuFact03, June 04 -11, New York Funneling pions and muons.

  6. Magnetic horn NuFact03, June 04 -11, New York Funneling pions and muons.

  7. Horn Parameters NuFact03, June 04 -11, New York Funneling pions and muons.

  8. Target in Horn NuFact03, June 04 -11, New York Funneling pions and muons.

  9. Target dynamics 1 • Condition for shock Energy deposited in a time short wrt sound propagation time. Typical scales: Distance ~ 1 cm, vs ~ 3000 m/s, ts ~ 3 ms. Synchrotron: bunch length ~ 5 ns Accumulator: pulse length ~ 1 km ~ 3 ms. • Escape from shock Fragment the target: Distance ~ 1 mm, ts ~ 0.3 ms. Good for accumulator. Insufficient for synchrotron. NuFact03, June 04 -11, New York Funneling pions and muons.

  10. Target dynamics 2 • Condition for rupture (P. Drumm et al., nFact00) Stress induced by shock exceeds elastic limit of target material. Typical scales: Ds ~ E aDT ~ 3500 MPa at 10 Hz in Ta Elastic limit ~ 400 MPa at room temperature. • Escape from rupture No shock, no stress. Reduce DT by increasing repetition frequency and beam size. NuFact03, June 04 -11, New York Funneling pions and muons.

  11. Effect of funneling on target parameters Ttarget THelium 1 target 4 targets NuFact03, June 04 -11, New York Funneling pions and muons.

  12. Pion Beam Parameters NuFact03, June 04 -11, New York Funneling pions and muons.

  13. Polarities Scheme 1: AC quadrupoles Scheme 2: DC quadrupoles Good transmission. Reduced transmission (2/3). Complicated power supplies due Conventional power supplies. to high stored magnetic energy. NuFact03, June 04 -11, New York Funneling pions and muons.

  14. Optical functions Center of mass trajectory b-functions NuFact03, June 04 -11, New York Funneling pions and muons.

  15. Magnet Parameters NuFact03, June 04 -11, New York Funneling pions and muons.

  16. Muon production • Y = Nm/Npversus longitudinal emittance for : • two transverse admittances et = 1p cm (no cooling), 4p cm (cooling) • three regimes: solenoid, conventional and high field quadrupoles. NuFact03, June 04 -11, New York Funneling pions and muons.

  17. Conclusions • Muon production for neutrino factories is on the way of being solved within the context of low energy, high repetition frequency proton driver. • Target and horn developments have started but not at the wanted pace. • Pending topics: magnet design, proton dump. NuFact03, June 04 -11, New York Funneling pions and muons.

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