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At present, ISIS, located at the Rutherford Appleton Laboratory in the UK, is the world's leading pulsed neutron and muon source. First neutrons were produced in December 1984, and since then large neutron and muon user communities have been built up. Every year, typically 1600 visitors are welcomed to ISIS, and 800 experiments are carried out. Hitherto ISIS has been based on an 800 MeV proton synchrotron delivering a 160 kW 50 pps beam to a target station incorporating a tungsten neutron-producing target preceded by a graphite muon-producing target. However, a second target station optimised for cold neutrons and running at 10 pps is currently being built, and the first experiments on the second target station are scheduled for 2008. At the same time, extensive performance-enhancing programmes (e.g. a dual harmonic RF system for the synchrotron) and re-lifing programmes (e.g. replacement of the synchrotron main magnet power supplies) are being carried out. The talk will describe the ISIS accelerators, the associated enhancement and re-lifing programmes, the target stations, and will also look forward to schemes for megawatt neutrons in the UK.
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