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The Front End Test Stand (FETS) project at RAL will test a two stage fast beam chopper, designed to address the requirements of high power proton drivers for next generation spallation sources, neutrino factories, and radioactive waste transmutation plants. A description is given of the status of development of the proposed two stage beam chopper. The results of a recent study on the dimensional optimisation of the proposed slow-wave structures, together with details of an updated beam line configuration for the chopper components, will be presented.
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