Abstract
When ISIS was first constructed the target and moderators were optimised to exploit the large epithermal fluxes of neutrons that are inherent to pulsed neutron sources. Since then, experience has shown that pulsed sources can effectively compete with reactors for certain applications even in the thermal and cold neutron regions. The plan to build a second target station at ISIS, that is specifically designed to use these low energy neutrons, has prompted this design study. The second target station will use one pulse in five from an upgraded 300 μA synchrotron giving a total power of 48 kW. This low power makes it possible to use highly efficient target designs such that, for some instruments, there will be substantial gains in flux compared to similar instruments on the existing ISIS target. In this preliminary report we present our current thoughts on the design of the second target station and the results of Monte-Carlo calculations of flux and pulse shape.
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