New concepts for guides and instruments at ESS - in particular the multi-analyser spectrometer CAMEA

Kim Lefmann (Niels Bohr Institute, University of Copenhagen, Denmark)

The European Spallation Source is finally under construction in Lund, Sweden. The long pulse (2.8 ms) makes the optimal design of instruments for ESS somewhat different from that of instruments at short-pulsed sources. We present the first 12 instruments chosen for construction at ESS, with an emphasis on the three Danish-Swiss designs: The Selene-type reflectometer Estia, the in-situ SANS/diffractometer Heimdal, and a multi-analyzer inverse-geometry spectrometer of the CAMEA type. The two latter instruments are longer than most existing instruments: 165 meters from the moderator. We present recent developments in guide simulation tools and ballistic guide design that is capable of transporting a decent amount of phase space of both cold and thermal neutrons over these long distances.

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