Abstract
We simulated spectra of reflectometers installed on pulsed sources as they are planned for the ESS (5 MW, 50 Hz short pulse, 1 MW, 10 Hz short pulse, and 5 MW, 16.67 Hz long pulse); for each of the sources a coupled moderator was used. For comparison of spallation and reactor sources, we simulated an instrument with equivalent parameters installed on a reactor source with a neutron flux of the ILL. For comparability of the data, constant wavelength and angular resolutions (of 3% and 8% were used for all instruments. The intensity at the detector was determined as a function of the momentum transfer for a virtual sample of total reflectivity and for deuterated water. Finally, it was calculated how long it takes for each source to measure the entire spectrum with a given statistical accuracy. Best results were obtained at the 50 Hz short-pulse source and the long-pulse source, while the 10 Hz short-pulse source performed worse. The measuring time calculated for the reactor source was the longest.
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