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Proton driver front end test stand Plans and organisation for 2004–05

Proton driver front end test stand Plans and organisation for 2004–05 David Findlay ISIS Accelerator Division. STVLTVS EST QVI ACCELERATORIBVS CVRANDIS VICTVM QVAERIT. Why a front end test stand? Prove key elements of high power proton accelerators

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Proton driver front end test stand Plans and organisation for 2004–05

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  1. Proton driver front end test standPlans and organisation for 2004–05 David FindlayISIS Accelerator Division STVLTVS EST QVI ACCELERATORIBVS CVRANDIS VICTVM QVAERIT

  2. Why a front end test stand? • Prove key elements of high power proton accelerators • Applications Generic Spallation neutron sources Neutrino factories Transmutation machines Tritium generators Energy amplifiers Training / Young people / Real hardware Specific ISIS upgrades UKNF UK academic accelerator community

  3. ISIS • World’s leading spallation neutron source • Natural wish to stay at or near front • Upgrade strategies important • CCLRC funding through ASTeC • UK Neutrino Factory • Strong drive from UKNF community • PPARC support for proton driver R&D • Synergies with possible ISIS upgrades • UK academic community • Imperial-CCLRC joint appointment • Extend university accelerator centres to protons

  4. What’s in a front end? • Ion source, LEBT, RFQ and beam chopper • Why does it matter? • Where beam quality set for entire machine • What has to be tested? • New, high performance ion sources, RFQs and beam choppers • ISIS 0.16/0.24 MW RunningSNS 1 MW Running soon • JPARC 1 MW Running soon • ISIS 1, 2, 5 MW Plans • UKNF 4 MW — a big step! Plans

  5. Proton driver front end test stand at RAL • ISIS Accelerator Division CCLRC/ASTeC • Imperial College PPARC • Warwick University PPARC • CCLRC/ASTeC ~£500k per year • PPARC ~£500k over three years • + 1¾x½ SY/year EU (HPRI-CT-2001-50021) (~£30k/year) • + 3 x¾ SY/year EU (HIPPI/CARE/ESGARD) (~£50k/year) • £2–2½M total

  6. Relationship with CERN test stand • Formal cooperation through HIPPI • Meeting last week at CERN • Spreading bets on beam chopper • But different • CERN test stand for Linac4 then SPL • Proton / H– ion sources • RAL test stand more generic • Differences reflect organisation’s missions

  7. Ion source 60 mA2 ms RFQ Bunch + accel-erate Chopper Switch in 2 ns for~0.1 ms LEBT Match ion source to RFQ Beam stop Diagnostics Transverse emittancesEnergy & energy spectrumBunch widthHalo Or RFQ - chopper - RFQ ?

  8. H– ion source — Development requiredBased on ISIS H– ion source LEBT — Revision of new ISIS LEBT sufficient RFQ — Base on ISIS & ESS 4-rod RFQsISIS RFQ designed for 10% RF duty factor cf. ISIS 2%Most expensive item: ~1 MW RF driver Beam chopper — Development requiredBased on ESS conceptNot necessarily ESS frequency (280 MHz) But need ion source, LEBT and RFQ to test beam chopper

  9. H– ion source R&D programme — for future high power proton accelerators (e.g. for future spallation neutron sources) — × ~10 output required Important milestone passed Successful thermal modelling of world leading ISIS ion source — extraction of surface temperatures Excellent agreement between calculated and measured thermocouple temperatures Anode 600°C Cathode 200°C Ab initio calc. Meas. °C °C Anode t/c 456 400 – 600 Cathode t/c 501 440 - 530 Body t/c 416 390 - 460 1 inch

  10. Beam chopper R&D programme — specialised hardware — fast, high voltage pulser specified and procured >1 kV rise in <2 ns

  11. At end of three years, i.e. by March 2007, expect to have • Dedicated area (in R8 (probably)) • Lead shed (shield against RFQ X-rays) • Support structure / Stands • Operational ~60 mA ion source available • LEBT assembled • Design for RFQ • Specification for RF driver • Proven electrical design for beam chopper • Design for quadrupoles and cavities for chopper • Specification of diagnostics

  12. 19 5 m 6½ 7½ 1½ 12 7 6½ 2 R8, existing test stand area Total area 166 m²

  13. Also have hardware available for subsequent three years • Area in R8 is well provided • Space, electricity, water, air, crane, loading bay, on ISIS controls circuit, …

  14. 2004–2007 Overall scheme, design, infrastructure, specifications, some hardware £2–2½M 2007–2010 Complete scheme £5M more — but would have world-class facility [End]

  15. Ion source development rig (ISDR) at RAL

  16. Experimental ion source and assembly

  17. RAL beam chopper design • Robust design with explicit provision for high power beam collection Slow transmission line 0 1 0 1 Up to 100 µs Lumped line — thermally hardened 2 ns 8 ns

  18. 1145 mm Beam Fast switch Slow switch Buncher cavity Buncher cavity Close-coupled chopper module

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