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ISIS operational update David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory / STFC DL-RAL Joint Accelerator Workshop, RAL 20–21 January 2009. ISIS Second Target Station now operational. ISIS Second Target Station now operational. 70 MeV H – linac.
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ISIS operational update David Findlay Accelerator Division ISIS Department Rutherford Appleton Laboratory / STFC DL-RAL Joint Accelerator Workshop, RAL20–21 January 2009
ISIS Second Target Station now operational 70 MeV H– linac 800 MeV proton synchrotron TS-1
ISIS Second Target Station now operational 70 MeV H– linac 800 MeV proton synchrotron TS-1
Dec. 2007: first protons to TS-2 Aug. 2008: first neutrons from TS-2
First beam — 340 V double pulse into 25 ohms1 hour 17 minutes to get beam from synchrotron to TS-2 First neutrons
Spallation neutron sources: • for investigating structure and dynamics of molecular matter • Currently operating spallation neutron sources: • PSI (Villigen, Switzerland) • SNS (Oak Ridge) • ISIS (RAL, Oxon.) • LANSCE (Los Alamos) • J-PARC (Tokai-mura) Decreasing power
ISIS — world’s most productive spallation neutron facility • ISIS • J-PARC, LANSCE, PSI, SNS • ISIS: 800 MeV protons on to tungsten targets, 0.2 MW • TS-1, 0.16 MW, 40 pps; TS-2, 0.04 MW, 10 pps • ~800 neutron experiments per year • ~1600 visitors/year (~5000 visits) • ISIS accelerators wholly for neutron factories • Also muon factory Decreasing number of target stations
ISIS Diamond Rutherford Appleton Laboratory, looking north
ISIS Rutherford Appleton Laboratory, looking north-east
70 MeV H– linac 800 MeV proton synchrotron TS-1
Target in operational position Target withdrawn into remote handling cell Overall target system schematic — 2
Moderators Solid tungsten cylinder, tantalum coated, surface cooled, 68 mm dia., 307 mm long — exploded view Reflector TS-2 tungsten target, tantalum coated, heavy water cooling
Solid methane moderators — containing aluminium foam for heat conduction
TS-2 optimised for cold neutrons • Long wavelengths, big molecules • TS-2 runs at 10 pps — 100 ms between pulses • 10 pps stolen from 50 pps from synchrotron • Only 40 pps left for TS-1 • Beam current × 50/40 • Dual harmonic RF — JWGT later • Commissioning TS-2 • Difficult while running full programme to TS-1 • Also CDM restrictions
ISIS 70 MeV H– linac 0.2 MW + 800 MeV H+ synchrotron J-PARC 180 MeV H– linac 0.2 MW1 + 3 GeV + 50 GeV synchrotrons LANSCE 800 MeV H+ /H– linac 0.8 MW + accumulator ring PSI 590 MeV cyclotron 1.2 MW + 72 MeV injector cyclotron SNS 1 GeV H– linac 0.6 MW2 + accumulator ring 1: For limited time during commissioning; ultimate design 1 MW with 400 MeV linac. 2: Still commissioning; 1 MW design operation.
PSI cyclotron PSI target station
Other accelerator work • H– ion sources • Front ends • DHRF, ring R&D • ISIS upgrades • Electrical engineering Letchford Thomason Glover