S. Manoshin, D. Clemens, K. Lieutenant, G. Zsigmond and F. Mezei A new neutron guide hall is going to be built at the Hahn-Meitner-Institut Berlin for three instruments: a new SANS instrument called VSANS, a new diffractometer called EED and the existing Spin-Echo spectrometer SPAN. First results of simulations of the beam line for these instruments can be found in ref. . The main features of new VSANS machine are multiple beam focussed at the centre of detector and gravitation velocity selector. Such configuration gives possibilities to have enhanced intensity at the sample and resolution in comparison with classical pinhole collimations for small flight distance 12 m. The gravitation velocity selector (monochromator) can be activated by shifting collimators plates (grids) in the vertical direction, if required. The positions and sizes of grids can be evaluated by analytical calculations. To check the real situation and analytical model the Monte Carlo simulations should be run. The simulations were performed with the VITESS software package . The comparison of analytical results and simulations are presented. Also some real situations (for example, if plates were produced with bad precision) are considered.
Abstract File: abstract00107.txt
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