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ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI

ISIS Developments David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory. ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI. ISIS — world’s leading spallation neutron source But ISIS accelerators primarily a neutron factory ~800 experiments/year

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ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI

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  1. ISIS Developments David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS MVNDI

  2. ISIS — world’s leading spallation neutron source • But ISIS accelerators primarily a neutron factory • ~800 experiments/year • ~1600 visitors/year • Output and reliability are key quantities

  3. ISIS from air

  4. ISIS outline • 17 kV H– ion source • 35 kV DC gap • 665 keV RFQ — new • 70 MeV drift tube linac • 800 MeV proton synchrotron — new 2RF • Target station 1 — 50 pps at present40 pps when TS-2 running • Target station 2 — 10 pps — new • Obsolescence mitigation — on-going

  5. 10 amp-hours delivered on 12 December 2005 • 36,000 C • 2.25E+23 protons • 4.4E+24 neutrons • 7.5 g neutrons • ~£30M/g

  6. 202½ MHz 4-rod RFQ LEBT Ion source

  7. RFQ rods + stems assembly

  8. Old Cockcroft-Walton

  9. 2RF: High power driver Cavity

  10. Four 2RF cavities in Straights 4, 5, 6 & 8

  11. 4 × 200–2000 A cavity bias regulators

  12. 4 × 20 kV, 10 A anode power supplies

  13. Obsolescence mitigation • Replacing ageing equipment • E.g. the NINA big choke • linac RF systems • extraction fast kickers • ...

  14. Old and new chokes for synchrotron main magnet power supply

  15. Extraction kickers: 5000 A, 100 ns rise time

  16. Tantalum wire shock tests for neutrino factory target

  17. Tantalum wire during and after pulsing

  18. Aim of RFQ + 2RF: 200 µA → 300 µA • New beam dynamics régime in synchrotron • Commission 2RF with beam — Andy Seville • Beam losses — Steve Payne • Diagnostics — Ben Pine

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