Comparison of collimation systems for small-angle neutron scattering

Conference · Tue Jan 01 04:00:00 EST 1985

DOI:https://doi.org/10.1016/0378-4363(86)90385-2· OSTI ID:5468939

Seeger, P A

It is shown by simple first-order geometric arguments that for a given resolution, the flux on sample in a small-angle scattering instrument is independent of the form of the collimator or of the length of the instrument. Count rate may be increased by increasing the sample size, through the use of multi-aperture systems. In second order, it is shown to be advantageous to place the beam defining elements as close as possible to the source and the sample. The multiple-pinhole system gives maximum flux on small samples but has non-uniform illumination so that intensity increases only about half as fast as sample area. Soller slits and continuous tubes from source to sample were also considered, but neutron scattering and reflection from surfaces generate a large halo. Monte-Carlo simulations confirm these results, with the conclusion that the optimum collimator configuration is the multiple-pinhole system. 4 refs., 4 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5468939
• Report Number(s): LA-UR-85-2722; CONF-850871-2; ON: DE85015732
• Country of Publication: United States
• Language: English

Related Subjects

651100* -- Nuclear Physics-- Experimental Techniques-- (1980-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
COLLIMATORS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
HADRON REACTIONS
MONTE CARLO METHOD
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
SCATTERING
SIMULATION
SMALL ANGLE SCATTERING