The specification of ESS 2002 was based on the 1996 design and reflects the development in science, the advance in accelerator design and the novel ideas for neutron instrumentation and beam extraction, which had taken place during the past 6 years.
The major change concerned the target stations in combination with the overall power level of the accelerator. Starting from a perspective on the future development of science across the whole range of fields for which neutrons in general and ESS in particular will be important, more than 70 scientists assessed the performance of generic instruments to investigate these scientific problems on three different target stations:
One was the 50Hz 5 MW SP station, the second a 10Hz 1 MW SP station and the third a 5 MW 16 2/3 Hz LP station. The advice from these scientists, which was later strongly endorsed by the ESS SAC, recommended that:
ESS should be built as a 10 MW facility serving two target stations, a SP 50Hz station and a 16 2/3 Hz LP station. Both target stations should be considered with equal priority.
More information: The ESS Project - Volume III - Technical Report  (PDF, 24MB)
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