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Proton Driver for the Neutrino Factory J. Pasternak, Imperial College, London / RAL STFC

Proton Driver for the Neutrino Factory J. Pasternak, Imperial College, London / RAL STFC. Outline of the talk. Introduction and ISS recommendations. Current options for NF proton driver. Towards proton driver compatible with neutron production (ISIS MW upgrade).

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Proton Driver for the Neutrino Factory J. Pasternak, Imperial College, London / RAL STFC

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  1. Proton Driver for the Neutrino Factory J. Pasternak, Imperial College, London / RAL STFC J. Pasternak

  2. Outline of the talk • Introduction and ISS recommendations. • Current options for NF proton driver. • Towards proton driver compatible with • neutron production (ISIS MW upgrade). • 4. Summary and future plans. J. Pasternak

  3. Reference IDS Neutrino Factory Design nsFFAG J. Pasternak

  4. ISS recommendations J. Pasternak

  5. Current options for NF proton driver • Linac based (SPL) proton driver at CERN – the most advanced. • Synchrotron(s)/FFAG based proton driver (green field solution) • – under study at RAL. • Project X based solution at Fermilab – (under study, 4 MW needs • to be demonstrated -?). • Solution based on synergy between neutron spallation source • (MW ISIS upgrade) and NF – idea shared by many people. • Other solutions (multiple FFAGs, NS-FFAGs, etc.) – in the state of ideas. J. Pasternak

  6. SPL based CERN proton driver (M. Aiba, CERN) • Both rings designed and tracked! • Study of instabilities during accumulaton – • chromaticity helps. • Orbit simulations of bunch compression – • large dispersion helps! J. Pasternak

  7. SPL based CERN proton driver parameters(M. Aiba, CERN) J. Pasternak

  8. Proton Driver for a Neutrino Factory (ISS), Ch. Prior, RAL • High intensity ~1014 protons • Achieved with phase space painting in RCS booster • 50Hz rep rate • Booster circumference 400m • Bunch area (h=3) 1.1 eV.sec • ns bunch compression in FFAG • 0.885MV per turn for 3.3ns rms, improved by higher harmonic component to 1.9 ns • FFAG circumference ~800m • ns bunch compression in RCS option • Achieved using h=24 RF • 1.3MV per turn for 3ns rms compression • RCS circumference same as for FFAG (~800m) • Delayed extraction of bunches to meet requirements of muon accelerators and decay rings • May be easier with FFAG than synchrotrons RCS Main synchrotron J. Pasternak

  9. Synergy with ISIS Upgrade • Basic idea is to take 2-3 bunches at 3.2 GeV (1-2 MW) • and accelerate it to achieve 4 MW in another RCS • Fundamental question – is bunch compression • possible? • ISIS Upgrade work plan • (deadline 12. 2010): • collimation • activation • beam dump • stripping • space charge simulations J. Pasternak

  10. Towards proton driver compatible with ISIS MW upgrade • There exists design for 3.2 GeV RCS. • Longitudinal and transverse dynamics is under study. • Longitudinal emittance is larger, but close to the one • needed for NF! • In order to deliver the beam for NF another RCS with • bunch compression capability is needed. • Bunch compression can be achieved by: • - adiabatic compression (l~V1/4) – high RF voltage needed! • - RF phase rotation – lower RF voltage, but problems with • delayed extraction. 3.2 GeV RCS J. Pasternak

  11. Summary and future plans • Parameters needed for Neutrino Factory Proton Driver • are well understood! • Several solutions are advancing well to be able to meet the goal. • In particular SPL based PD at CERN is now studying the collective effects! • ISIS upgrade may be an interesting option for UK to create • a multiuser facility ( for neutron production and NF). • Work plan for ISIS MW upgrade compatible pd: • Theoretical scaling law of bunch compression. • Space charge simulations (if 1 successful !). • Then more detailed RCS design. J. Pasternak

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