Abstract
It is proposed to build a flexible, high-resolution time-of-flight diffractometer and spectrometer at the new reactor FRM II of the Technische Universität München. To optimize the layout of individual components and to estimate the performance of the entire instrument, we have made analytical calculations and Monte-Carlo simulations mainly with “McStas”, programmed by RISØ, Denmark. MC simulation routines for neutron devices like curved guides, disc- and Fermi choppers have been added. The influence of curved guides in neutron phase space has been developed and will be presented. Line shapes of neutron pulses and transmission have been studied for a Fermi chopper with straight slits and will be compared with the results of simulation.
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