RAL Front End Test Stand Context David Findlay

RAL Front End Test Stand — Context David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory ISIS OPTIMVS NEVTRONVM SPALLATIONENSIVM FONS ORBIS TERRARVM

Front End Test Stand (FETS) aimed at future high power proton and H — accelerators (HPPAs) High power = megawatt-class HPPAs for • neutron spallation sources • neutrino factories • transmutation facilities • accelerator driven power reactor systems • tritium production 2 2

Justification for working towards HPPAs? Four reasons: European policy UK policy CCLRC/PPARC policy ISIS policy Essentially spallation neutron sources and neutrino factories Synergy 3 3

ESS ~€ 1 B 4 4

MW neutrons for Europe ~€ 500 M UK Neutrino factory contribution ~€ 1 B UK contribution 5 5

Front End Test Stand supported by 6 6

Underpinning ISIS ~£ 30 M/year Front end test stand would become front end of new ISIS linac 7 7

HPPAs — expensive So suitable R&D essential “ESS” bid to FP 7 expected May/June 2007 Likely to be long-pulse linac — UK provide front end? Upgrade to ISIS Probably cheapest route to MW neutrons — front end issues Synergy between neutron and neutrino applications Key element of support for front end test stand CERN test stand Specific, not generic test stand. Also less self-sufficient 8 8

Time lines ESFRI: ESS first users ≥ 2017 RCUK: MW neutrons, £ 25– 50 M/year from 2009– 10 Neutrino factory, £ 25– 50 M/year from 2011– 12 Consistent with 2007– 10 for second half of FETS 9 9

Key points about HPPAs High power is difficult Imperative to keep beam losses low (~1 W/m) ISIS only ~0. 2 MW, but × 2 beam losses would make life very difficult (2– 3 m. Sv annual dose limit) Need good quality beam Space charge issues significant Implies beam chopper necessary even if no rings involved Need to control transients — RF and target issues Implies beam chopper very desirable 10 10

Need to demonstrate high quality working beam chopper Requires front end test stand Implies ion source, LEBT, ~3 Me. V RFQ, diagnostics, RF, . . . Excellent progress achieved during 2004– 07 On all fronts — as will become evident Looking forward to finishing the job during 2007– 10 11 11

12 12

ISIS RFQ test stand Front end test stand 13

RAL test stand cf. CERN test stand Operationally proven ion source / RAL Ion source from DESY Proven 3 -solenoid LEBT 2 -solenoid LEBT Building 3 Me. V RFQ Chopper pulser already proven yet proven Saclay IPHI 3 Me. V RFQ — should be ready Dec-06 Chopper pulser not Tuneable deflector not yet built Meander line deflector built Comprehensive laser-based beam diagnostics Diagnostics? Successor to proven test stand Major time scale and location changes Substantial local involvement Insufficiently local support Firmly fixed at RAL Linac 4 Moving to Saclay, then 14