Controls Evolution on ISIS, an Accelerator Based Neutron Production Facility
The ISIS spallation neutron source has been a production facility since 1984 with the original, single, target station. ISIS is now starting the second phase of its life with two target stations and the possibility of further upgrades. The author has worked in the ISIS controls group since before first neutrons and leads the group into this new phase. The difficulties and solutions surrounding legacy systems in such an environment (where a facility lifetime may approach 50 years) are discussed.