Speaker
Description
A selene type, 20 m long instrument has been proposed on the 96 Hz moderator which could serve as a future macromolecular diffractometer for single crystals (e. g. protein crystals). A macromolecular diffractometer at the 24 Hz TMR station with a conventional neutron guide of 80 m length using a cold moderator is planned to be designed and simulated. A traditional elliptical neutron guide is considered to shape the beam spot and the divergence for the instrument, since the typical biological sample size is very small, sometimes between 0.01 mm3 and 1 mm3. An optimized neutron guide for the latter instrument should be developed and its performance should be compared to the 20 m long instrument. While this might lead to worse background conditions and requires a significant beamline shielding, it would add the flexibility to use a pulse shaping chopper. It is simulated that the 80 m instrument has twice the flux and a 1.5 times better resolution in reciprocal space of the 20 m instrument in a wavelength band of 2-4 Å.
