Multipurpose flight time device for quality measurement of cold neutron beam

Abstract

The invention belongs to a two-dimensional measuring technique of the quality of a cold neutron beam and particularly relates to a multipurpose fight time device of quality measurement of the cold neutron beam. The structure of multipurpose fight time device of the quality measurement of the cold neutron beam comprises a first slit device for passing the cold neutron beam. The rear side of the first slit device is provided with a mechanical chopper which is connected with an inlet end of a neutron flight tube, wherein the neutron flight tube is parallelly arranged. An outlet end of the neutron flight tube is connected with a second slit device. The rear side of the second slit device is provided with a detector and a shield device. The detector is connected with a computer through a multichannel time analyzer. The multipurpose fight time device of the quality measurement of the cold neutron beam is ingenious in structure, low in hardware cost and easier and more stable in the whole system and can achieve high precision of corner positioning and quick starting and braking. In the meantime, specific designing conditions of a transmission system of the cold neutron beam can be considered, so needs of beam energy spectrum and quality parameter measurement required by each cold neutron spectrometer can be fully met.

Description

technical field [0001] The invention belongs to the two-dimensional measurement technology of cold neutron beam quality, in particular to a multipurpose time-of-flight device for measuring the quality of cold neutron beam. Background technique [0002] The energy spectrum of cold neutron beam is one of the basic parameters of neutron scattering experiment and reactor cold neutron source, and also one of the important symbols to measure the performance of cold neutron beam delivery system and the level of cold neutron scattering experiment. In foreign countries, the cold neutron energy spectrum is generally measured before and after the installation of the cold neutron spectrometer, and the detection is not performed regularly, and the results are written in the basic parameters and annual report of the research center. However, domestic research work based on cold neutron spectroscopy has not been reported, and the measurement work in this area is still blank in our country....

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Problems solved by technology

However, the design of this device cannot meet the measurement requirements of the cold neutron scattering spectrometer, including beam level distribution, beam angle divergence distribution, etc.

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