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Front end test stand — WP2 Lead author: David Findlay Accelerator Division ISIS Department

Front end test stand — WP2 Lead author: David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory Michael Clarke-Gayther Alan Letchford John Thomason. Strong overlap. Why interest in front end? Front end of machine is where

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Front end test stand — WP2 Lead author: David Findlay Accelerator Division ISIS Department

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  1. Front end test stand — WP2 • Lead author: • David Findlay • Accelerator Division • ISIS Department • Rutherford Appleton Laboratory • Michael Clarke-Gayther • Alan Letchford • John Thomason

  2. Strong overlap • Why interest in front end? • Front end of machine is where • currents and duty cycles are set for whole machine • beam quality is set for whole machine • UKNF: 5 MW — Front end must be good! • Multi-megawatt proton accelerators are new • Neutrino factories • Neutron sources, transmutation,tritium, energy, etc. • 1 W/m loss max., ~10—7 loss per metre

  3. Neutrino factory proton driver: • Ion source (65 mA) • LEBT (low energy beam transport) • RFQ (75 keV 2.5 MeV, 280 MHz) • Chopper (typically ~30% chopped out) • DTL (2.5 MeV 180 MeV, 280 MHz) • Achromat • Synchrotrons • Need a front end test stand! Front end

  4. Ion source: H—, 65 mA, 400 µs • 2 × 2 × world’s leading H— source — ISIS • Existing negative ion source development programme at RAL for HPPAs in general • ASTeC • EU (network HPRI-CT-2001-50021) • This programme a benefit to front end test stand programme

  5. Ion Source Development Rig at RAL

  6. LEBT and RFQ • Low energy beam transport • Matches 65 mA from ion source to RFQ • RFQ • 4-rod, 75 keV 2.5 MeV, 280 MHz • These less of a problem • Can base on experience of LEBT and RFQ for ISIS • More a matter of implementation than R&D • But ~1–1½ MW RF driver required for RFQ

  7. Why chopper? Ion source Linac Ring Beam loss >10 × ISIS Bunching Also to minimise RF transients and control beam intensity

  8. With chopper — gaps in beam Ion source Linac Ring No beam loss Bunching

  9. Chopper performance required DC accelerator RF accelerator ns – µs spacing UKNF: 280 MHz, bunch spacing 3.57 ns Switch between bunches Good On Off Bad Partially chopped bunches a problem! Tune shifts!

  10. Choppers across the world: • SNS 402 MHz, slow — only chopper built • CERN 352 MHz, power dissipation? • RAL 280 MHz, fast, rugged, “UK” LEBT MEBT SNS, 2½ ns per bunch

  11. RAL aspiration: switch in 2 ns and dissipate ~3–4 kW (when “off”) 2-stage process Slow transmission line 1 0 1 0 Lumped line — thermally hardened 2 ns 8 ns

  12. RAL beam chopper— outline scheme Beam ~1 m Need to build andtest with bunched beam

  13. Build test stand • Ion source (R&D already • under way) • LEBT • RFQ (bunches beam) • Chopper • Diagnostics Experience of building test stands at RAL — ISIS RFQ test stand

  14. Front end test stand at RAL — costs SY £k (hardware incl. VAT + contingency) Overall design + infrastructure 8 398 Ion source 7 347 LEBT 5 231 RFQ 14 1388 Chopper 481990 4355 hardware 185 travel 82 4495 staff 9035 total

  15. Front end test stand at RAL — time scales

  16. Front end test stand at RAL • Six-year programme to build • Costed on basis of test stand already built and working • ~£4½M equipment • ~80 staff-years • RAL + university staff • Physics and engineering of real accelerator facility

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