Method for testing divergence angle of neutron Soller collimator

Abstract

The invention discloses a method for testing divergence angle of a neutron Soller collimator. The method includes the steps of selecting a Gaussian function to describe an angular divergence distribution function of a neutron source and an angular divergence response function of a neutron transmission collimator, subjecting the angular divergence distribution function of the neutron source and the angular divergence response function of the neutron transmission collimator to mathematical integration to form a rocking curve expression; performing experimental measurement to obtain experimental data of rocking curves of neutron intensity changing with the rocking angle after neutrons pass the to-be-tested neutron Soller collimator and a reference neutron Soller collimator; subjecting the experimental data of the rocking curves to data fitting through the rocking curve expression so as to obtain a rocking curve standard error; calculating a divergence angle of the to-be-tested neutron Soller collimator. The method has the advantages that the divergence angle range of a neutron source need not be limited, the divergence angle of the reference collimator is optional in the testing process, relative to a quantic polynomial of 6 undetermined parameters, and the divergence angle of the to-be-tested collimator can be conveniently estimated in a certain error range.

Description

technical field [0001] The invention relates to neutron scattering technology, in particular to a method for testing the divergence angle of a neutron Soller collimator. Background technique [0002] The neutron Soller collimator is an instrument mainly used to limit the divergence angle of the neutron beam to collimate the neutron beam. When using the neutron Soller collimator, it is necessary to test and analyze the divergence angle. [0003] The existing method for testing and analyzing the divergence angle of the neutron Soller collimator first establishes a mathematical model according to the experimental configuration, then performs theoretical calculations to obtain the shaking curve response function describing the experimental data, and finally uses the theoretical shaking curve function to fit the experimental data to obtain the collimation The precise value of the divergence angle of the collimator; the theoretical calculation part is mainly based on two models, t...

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Problems solved by technology

[0004] This method requires a certain divergence angle range of the neutron source, so it is necessary to limit the divergence angle of the neutron source within a certain range before it can be used, and the divergence angle of the reference collimator needs to be consistent with the divergence angle of the collimator to be tested. Carrying out test analysis, the theoretical function of the shaking curve that finally fits the experimental data is a fifth-degree polynomial, so the test results are more complicated, and it is impossible to estimate the divergence angle of the collimator to be tested within a certain error range, so there is a certain room for improvement

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