Neutron beams of FRM-II at the Technische Universitaet Muenchen

At the new FRM-II, an optimized system of beam tubes and neutron guides has been designed to meet the different requirements of the scientific users. Some of the beam tubes supply thermal neutrons, some are linked to cold or hot sources to provide cold (even ultracold) or hot neutrons, respectively, one tube supplies fast fission neutrons, and two tubes are designed to provide beams of positrons or fission product ions with unprecedented intensity. A system of 650 m of neutron guides multiplies the experimental area accessible with thermal and cold neutrons, reduces the background originating from fast neutron and gamma radiation, and can even deliver polarized neutrons. In conclusion, the advanced design concept of the new reactor, in combination with the numerous beam tubes and neutron guides which have all been optimized a priori for their different fields of application, render the FRM-II an outstanding and most attractive source for all kinds of scientific investigations with neutrons. In addition to these devices dedicated to neutron beam applications, six facilities (not described in this paper) have been installed to irradiate samples in a high flux of thermal neutrons