Neutron optical component for the small angle neutron scattering - measuring technique

摘要

For examining on material in the small angle neutron scattering - measuring technique used in a high measurement resolution at the same time as a large single beam surface, and beam intensity necessary. With known diaphragms - collimators, the beam divergence required for this purpose, however, not be achieved without unacceptable loss of intensity. The inventive neutron optical component (1) has a plurality of successively arranged, as a pinhole diaphragms structured as lattice diaphragms (7) formed on, wherein each grid screen (7) a plurality of light stop apertures (14) comprises. Thus, the neutron beam is divided into individual air jets, which are individually be improved in their convergence. For this purpose, the from the course of all the lattice diaphragms (7) via the same in each case positioned diaphragm openings (14) defined channels in a function of the construction of the measurement instrument given cone of convergence narrowed. At the same time a result, a focussing of all partial beams take place on the detection site. For the selection of monochromic neutrons, the lattice diaphragms (7) positioned on the speed-dependent parabola webs. Of course, the claimed neutron optical component not only the form of a high-resolution, fokusierender collimator, but simultaneously also as the velocity selector of. By means of a continuous and cyclic process of the lattice diaphragms (7) over all of the parabola webs can be utilized, the entire neutron beam. Therefore, in particular, a use in the case of pulsed ..