Neutron collimator structure with continuously adjustable divergence angle and calibration method thereof

Abstract

The invention discloses a neutron collimator structure with continuously adjustable divergence angle and a calibration method thereof. The neutron collimator structure includes a neutron shielding andabsorbing shell, a slide rail which is fixed to the inside of the neutron shielding and absorbing shell, a first neutron collimator which is fixedly mounted on the slide rail, a second neutron collimator which is mounted on the slide rail and can move along the slide rail to change the length of a neutron absorption layer corresponding to a neutron incident direction so as to realize continuous adjustment of a neutron divergence angle, and a driving structure which is used for driving the second neutron collimator to move along the slide rail. The neutron collimator structure can greatly reduce the replacement frequency of the collimators in practical applications, thereby saving valuable neutron beam time, and reduces the number of the required collimators, thereby saving a large amountof purchase funds.

Description

technical field [0001] The disclosure belongs to neutron optical devices, and relates to a neutron collimator structure with continuously adjustable divergence angle and a calibration method thereof, in particular to a neutron collimator with continuously adjustable divergence angle based on changing the length of the neutron absorbing layer neutron collimator structure, and the calibration method of the divergence angle of the neutron collimator structure. Background technique [0002] The neutron scattering spectrometer uses a large number of neutrons of different energies produced by reactors, spallation sources, etc. It is an instrument for studying the stress, texture, microstructure and magnetic correlation properties of samples. [0003] Because the neutrons produced by the reactor or spallation source scatter toward the 4π direction, the divergence angle of the neutron beam drawn from the tunnel is very large, and the measurement of the momentum change requires the ...

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Problems solved by technology

[0004] The neutron divergence angle of the neutron collimator currently used is determined at the time of manufacture and cannot be adjusted according to the use requirements; in addition, the neutron collimator is generally placed inside the shield and cannot be replaced at any time according to the needs. Collimator with divergence angle

Therefore, in order to complete different neutron experiments, the current general neutron spectrometer will pre-install several neutron collimators with commonly used divergence angles in the shielding body, but due to the limited space inside the shielding body, it is impossible to install the required collimators. collimator, still can not meet the requirements of all neutron experiments, and it takes a long time to replace the collimator, and it takes a lot of money to buy a variety of different types of collimators

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