Monte Carlo simulation of the new time of flight powder diffractometer EXED at the Hahn Meitner Institut

The new diffractometer EXED at HMI designed for high resolution and extreme environments like very high magnetic fields has been simulated in detail using the software package VITESS. The simulation includes the beam extraction system, beam splitter, kink, chopper system, sample and detector. Many parameters like coatings, kink angle etc. were varied to improve the instrument. The chopper system was checked and an elliptical focussing guide optimized. Finally, powder diffraction patterns of an aluminium sample showed that a resolution of amp; 8710;d d lt; 0.0002 will be feasible at 176 detector angl