CN109212585B - Testing method and device for detecting embedded angle distribution of neutron monochromator - Google Patents
Testing method and device for detecting embedded angle distribution of neutron monochromator Download PDFInfo
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Abstract
The application provides a testing method for detecting the mosaic angle distribution of a neutron monochromator, which comprises the steps of initially calibrating a neutron light path of a neutron beam, wherein a diffraction surface of the neutron monochromator for receiving the neutron beam is a maximum intensity diffraction surface; adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction plane, collecting neutron intensity measurement data obtained by the detector at different deviation angles, and performing Gaussian fitting on the measurement data to obtain the curve half-width of the measurement data; and calculating to obtain the mosaic angle distribution half-width of the neutron monochromator according to the curve half-width, the first collimation angle of the first collimator and the second collimation angle of the second collimator. The testing method for detecting the mosaic angular distribution of the neutron monochromator, disclosed by the application, utilizes the neutron beam to measure the mosaic angular distribution of the neutron monochromator in the whole process, and the whole measuring process is simple and convenient, and is not limited by the radiation source beam with extremely small divergence and the corresponding high debugging precision requirement.
Description
Technical Field
The application relates to the field of neutron monochromator mosaic angle testing, in particular to a testing method and device for detecting the mosaic angle distribution of a neutron monochromator.
Background
The physical function of the neutron monochromator is mainly used for monochromatization of neutron beam, namely, the neutron beam with fixed single wavelength is selected from the white light neutron beam and used for subsequent neutron scattering experimental research. Meanwhile, the method has a certain modulation effect on the divergence of neutron beam, and is closely related to the resolution of neutron scattering experiments. Because the performance of the monochromator is closely related to the mosaic angle distribution of the monochromator, the crystal monochromator for neutron scattering experiments needs to have a certain mosaic angle distribution, but the mosaic angle width of single crystals produced by a normal process is generally too small to be directly used for the neutron monochromator, and complicated and strict processing procedures, such as repeated vacuum hot pressing on single crystal wafers, are generally required to obtain monochromator crystals with a certain mosaic angle distribution, and the experiment requirements can be met. From the aspects of process optimization of processing treatment of monochromator crystals, evaluation of quality of finished monochromator products, resolution analysis of neutron scattering experiments and the like, development of an accurate and rapid measuring technology of monochromator mosaic angular distribution, namely, detection of half-width of the mosaic angular distribution to obtain the mosaic angular distribution, is urgently needed.
The detection of the mosaic angle distribution of the neutron monochromator at present adopts gamma ray diffraction to measure the mosaic angle distribution of the neutron monochromator, and the method is an indirect measurement method for measuring the neutron monochromator by using gamma ray diffraction, wherein the interaction mechanisms of gamma rays and neutrons and substances are different, and the gamma ray measurement result and the actual neutron experiment result have certain difference. Secondly, the method has the advantages that the device and the method are complex due to the fact that the gamma ray wavelength is short, the experiment precision requirement is high, the debugging and measuring process are difficult, the input beam required for diffraction experiments is extremely small in divergence, and therefore strict requirements are required on the complexity of the device and the debugging method to ensure the measurement precision, so that the conventional detection work of a monochromator necessary for a worker is greatly challenged and inconvenient by the existing method for detecting the embedded angle of a neutron monochromator by gamma rays, and the detection work is limited in the implementation process.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the application is to provide a testing method for detecting the mosaic angle distribution of a neutron monochromator, which can solve the problems that the conventional detection work of the monochromator necessary for a worker is more challenging and inconvenient by adopting the current method for detecting the mosaic angle of the neutron monochromator by gamma rays, and the detection work has certain limitation in the implementation process.
The application also aims to provide a testing device for detecting the mosaic angle distribution of the neutron monochromator, which can solve the problems that the conventional detection work of the monochromator necessary for a worker is more challenging and inconvenient by adopting the method for detecting the mosaic angle of the neutron monochromator by gamma rays at present, and the detection work has certain limitation in the implementation process.
One of the purposes provided by the application is realized by adopting the following technical scheme:
a test method for detecting a neutron monochromator mosaic angular distribution, comprising the steps of:
step S1, controlling a neutron source to start a neutron beam, wherein the neutron beam sequentially passes through a neutron slit, a first collimator, a neutron monochromator, a second collimator and reaches a detector, and the detector acquires the measured neutron intensity of the neutron beam;
s2, primarily calibrating a neutron light path of the neutron beam, wherein a diffraction surface of the neutron monochromator for receiving the neutron beam is a maximum intensity diffraction surface;
s3, adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction plane, changing the position of the neutron monochromator according to each deviation angle, and executing the step S1 to obtain measurement data containing a plurality of deviation angles and the measured neutron intensity corresponding to each deviation angle acquired by the detector;
s4, performing Gaussian fitting on the measurement data to obtain the curve half-width of the measurement data;
and S5, calculating to obtain the mosaic angle distribution half-width of the neutron monochromator according to the curve half-width, the first collimation angle of the first collimator and the second collimation angle of the second collimator.
Further, the step S2 specifically includes: and preliminarily calibrating the center positions of the neutron slit, the first collimator, the neutron monochromator, the second collimator and the detector to coincide with the center line of the neutron beam through the laser calibration device.
Further, the step S5 is specifically to calculate the half-width Γ of the mosaic angular distribution of the neutron monochromator by the following formula (1) m Equation (1) is:
wherein ,Γm Half-width gamma-ray for neutron mosaic angle distribution 1+2+m For measuring the curve half-width of data, Γ 1 Is the first collimation angle of the first collimator, Γ 2 Is the second collimation angle of the second collimator.
Further, the measurement data includes a plurality of data points, each of the data points includes one of the offset angles and the measured neutron intensity corresponding to the offset angle, the plurality of data points form a data curve in a coordinate system composed of the offset angle and the measured neutron intensity, and the number of data points is not less than 20.
The second purpose of the application is realized by adopting the following technical scheme:
the testing device comprises a testing component and a control component, wherein the testing component comprises a neutron slit plate, a first collimator, a second collimator, a neutron monochromator and a detector, a neutron slit is arranged in the center of the neutron slit plate, a neutron beam started by a neutron source sequentially passes through the neutron slit, the first collimator, the neutron monochromator and the second collimator and reaches the detector, the central lines of the neutron slit, the first collimator and the neutron monochromator are positioned at the same straight line position, the central lines of the neutron monochromator, the second collimator and the detector are positioned at the same straight line position, and the detector acquires the measured neutron intensity of the neutron beam;
the control component is used for controlling the postures of the first collimator, the second collimator and the neutron monochromator and controlling the measured neutron intensity acquired by the detector.
Further, the control component comprises a motion control module and a data acquisition module, wherein the motion control module is used for controlling the postures of the first collimator, the second collimator and the neutron monochromator, and the data acquisition module is used for controlling the measured neutron intensity acquired by the detector.
Further, the device also comprises three adjusting tables, wherein the adjusting tables comprise a first collimator adjusting table, a second collimator adjusting table and a neutron monochromator adjusting table, and the first collimator, the second collimator and the neutron monochromator are respectively arranged on the corresponding first collimator adjusting table, second collimator adjusting table and neutron monochromator adjusting table.
Further, the collimation angle ranges of the first collimator and the second collimator are 6 'to 30'.
Further, the detector is a helium-3 neutron counter or BF 3 A neutron detector or a scintillator detector or a neutron imaging detector.
Further, the neutron beam is a neutron beam of a single wavelength.
Compared with the prior art, the application has the beneficial effects that: according to the testing method for detecting the mosaic angle distribution of the neutron monochromator, the neutron path of the neutron beam is initially calibrated, and at the moment, the diffraction surface of the neutron beam received by the neutron monochromator is the maximum intensity diffraction surface; adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction plane, collecting neutron intensity measurement data obtained by the detector at different deviation angles, and performing Gaussian fitting on the measurement data to obtain the curve half-width of the measurement data; the half-width of the mosaic angle distribution of the neutron monochromator is obtained through calculation according to the half-width of the curve, the first collimation angle of the first collimator and the second collimation angle of the second collimator, only a neutron source is controlled to start a neutron beam in the whole process, the position of the neutron monochromator is regulated, data acquired by a detector are recorded, the half-width of the mosaic angle distribution of the neutron monochromator is obtained according to the acquired data, the whole measurement process is simple and convenient, and the limitation of high requirements on the beam current of a radiation source with extremely small divergence and corresponding debugging precision is avoided.
The foregoing description is only an overview of the present application, and is intended to provide a better understanding of the present application, as it is embodied in the following description, with reference to the preferred embodiments of the present application and the accompanying drawings. Specific embodiments of the present application are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a test method for detecting a neutron monochromator mosaic angular distribution according to the present application;
FIG. 2 is a schematic diagram of a testing apparatus for detecting a mosaic angular distribution of neutron monochromators according to the present application;
FIG. 3 is a schematic diagram of the working principle of a testing device for detecting the mosaic angular distribution of neutron monochromator according to the present application.
In the figure: 1. a neutron source; 2. a neutron slit plate; 3. a neutron monochromator; 4. a detector; 5. a second collimator; 6. a first collimator.
Detailed Description
The present application will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
The test method for detecting the mosaic angular distribution of the neutron monochromator, shown in fig. 1, specifically comprises the following steps:
step S1, controlling a neutron source to start a neutron beam, enabling the neutron beam to sequentially pass through a neutron slit, a first collimator, a neutron monochromator and a second collimator and reach a detector, and acquiring the measured neutron intensity of the neutron beam by the detector;
s2, primarily calibrating a neutron light path of the neutron beam, wherein a diffraction surface of the neutron monochromator for receiving the neutron beam is a maximum intensity diffraction surface; in this embodiment, step S2 specifically includes preliminarily calibrating, by the laser calibration device, the center positions of the neutron slit, the first collimator, the neutron monochromator, the second collimator and the detector to coincide with the center line of the neutron beam, when the center positions of the neutron slit, the first collimator, the neutron monochromator, the second collimator and the detector coincide with the center line of the neutron beam, and the diffraction angle of the neutron monochromator is at the position of the best bragg diffraction condition, and at this time, the measured neutron intensity acquired by the neutron detector acquired by the detector is the maximum neutron intensity.
Step S3, adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction plane, namely adjusting the diffraction angle position of the neutron monochromator in the embodiment, recording the corresponding deviation angle when each adjustment is performed, changing the position of the neutron monochromator according to each deviation angle, and executing step S1 to obtain measurement data containing a plurality of deviation angles and measuring neutron intensity corresponding to each deviation angle collected by a detector; in this embodiment, each deviation angle corresponds to a diffraction angle position of a neutron monochromator, and corresponding measured neutron intensities are collected at positions of the neutron monochromator at each different deviation angle, that is, each measured neutron intensity corresponds to each deviation angle one by one, the measured data includes a plurality of data points, and coordinates of each data point correspond to the measured neutron intensity from one deviation angle to the deviation angle; the data points form a data curve in a coordinate system composed of the offset angle and the measured neutron intensity, the number of the data points is not less than 20, and when the number of the data points is less than 20, the measured data is not representative, so that at least 20 data points are selected in the embodiment.
S4, performing Gaussian fitting on the measured data to obtain the curve half-width of the measured data; the data points in the measured data are subjected to Gaussian fitting, a curve of the measured data can be drawn, and the half-width of the curve can be calculated according to Gaussian fitting parameters, wherein the half-width is the full-width value of the curve when the peak value of the curve is half, namely the peak width when the peak value is half of the peak value. In this embodiment, the measurement angle range is not less than three times the half-width of the curve of the measurement data, and when the measurement angle range is less than three times the half-width of the curve, since the coverage is small, it is difficult to describe the distribution trend of the whole curve accurately, and the result is not accurate.
And S5, calculating to obtain the mosaic angle distribution half-width of the neutron monochromator according to the curve half-width, the first collimation angle of the first collimator and the second collimation angle of the second collimator. Specifically, the half-width Γ of the mosaic angle distribution of the neutron monochromator is calculated by the following formula (1) m Equation (1) is:
wherein ,Γm Half-width gamma-ray for neutron mosaic angle distribution 1+2+m For measuring the curve half-width of data, Γ 1 Is the first collimation angle of the first collimator, Γ 2 Is the second collimation angle of the second collimator. The specific calculation process of the above formula (1) in this embodiment is as follows: assuming that the neutron optical path comprises a first collimator, a second collimator and a neutron monochromator to meet Bragg diffraction conditions, changing the angle of the diffraction angle of the neutron monochromator deviating from an ideal diffraction surface to be gamma, and obtaining a curve function theoretical expression describing measured data according to mathematical model and mathematical analysis of a measuring process, wherein the curve function theoretical expression is shown as a formula (2):
wherein ,α=θ' - θ, R (γ) is a mosaic angular function curve, γ is the angle at which the diffraction angle of the neutron monochromator deviates from the ideal diffraction plane; r is R 0 Is an integral constant, sigma 1 、σ 2 、σ m 、σ 1+2+m The method comprises the steps that standard errors of Gaussian distribution of a first collimator, a second collimator, a neutron monochromator and an experimental measurement curve are respectively set, theta is a Bragg angle of diffraction of a reflecting surface when a neutron beam along the central line direction of the first collimator and the second collimator is inlaid by the neutron monochromator by an orientation angle beta=0, at the moment, the neutron monochromator is positioned at an ideal reflecting surface position, and the diffraction intensity value of the neutron monochromator is highest; θ' is the divergence angle +.>When the neutron beam is diffracted by the reflecting surface with the embedding orientation angle beta of the neutron monochromator,for divergence angle deviating from the first collimator centerline +.>Is the divergence angle from the second collimator centerline. The formula (3) can be obtained through integral calculation, and the formula (3) is as follows:
wherein ,σ1 、σ 2 、σ m 、σ 1+2+m The standard errors of the Gaussian distribution of the experimental measurement curve are respectively a first collimator, a second collimator, a neutron monochromator; using the relation between the half-width of the expression Gaussian function and the standard errorSubstitution operation can obtain formula (1).
In the present embodiment, if the divergence angles of the selected first collimator and the second collimator are the same, i.e., Γ 1 ＝Γ 2 ＝Γ c ，Γ 1 Is the first collimation angle of the first collimator, Γ 2 Is the second collimation angle of the second collimator Γ c Is constant. In this case, the formula (1) can be simplified into the formula (4)The illustration is:
wherein ,Γm Half width and Γ of inlaid angle distribution for neutron monochromator 1+2+m For measuring the curve half-width of data, Γ 1 Is the first collimation angle of the first collimator, Γ 2 Is the second collimation angle of the second collimator Γ c Is constant.
In this embodiment, a collimator of smaller collimation angle is typically selected in order to reduce the effect of neutron source divergence. In addition, the collimator with smaller collimation angle is also beneficial to improving the measurement accuracy of the mosaic angle of the monochromator. Table 1 shows the results of the half-width calculation of the curve measured by the partial common monochromator mosaic angle experiment. Table 1 shows the following:
table 1: test curve half-width calculation result of common neutron monochromator mosaic angle test
In Table 1 Γ m Half width and Γ of inlaid angle distribution for neutron monochromator 1+2+m For measuring the curve half-width of data, Γ 1 Is the first collimation angle of the first collimator, Γ 2 A second collimation angle that is a second collimator; Γ -shaped structure m /Γ 1 The ratio of the half-width of the mosaic angle distribution of the neutron monochromator to the first quasi-right angle of the first collimator is calculated, wherein the units of the divergence angles are divided; from Table 1, it can be derived that the ratio Γ of the half-width of the mosaic angle of the mesomonochromator relative to the collimation angle of the collimator in the case of selecting two collimators of the same collimation angle m /Γ 1 The larger the neutron monochromator mosaic angle distribution half-height width Γ m And experimental measurement curve half-height width gamma 1+2+m Relative to each otherThe smaller the deviation. When Γ is m /Γ 1 >2, the relative deviation is less than 5.72%. When Γ is m ＝Γ 1 ＝Γ 2 When Γ is m and Γ1+2+m The relative deviation was 18.35%, at which time Γ was used directly 1+2+m To describe Γ m A large error is introduced and Γ needs to be further calculated m . When Γ is m /Γ 1 >2.5 Γ m and Γ1+2+m The relative deviation can be reduced to below 4%, namely the half-width of the experimental measurement curve can be directly adopted to estimate the size of the monochromator mosaic angle within the error range of 4%.
As shown in fig. 2-3, the present application further provides a testing device for detecting a mosaic angular distribution of a neutron monochromator, which specifically includes: the neutron detector comprises a testing component and a control component, wherein the testing component comprises a neutron slit plate 2, a first collimator 6, a second collimator 5, a neutron monochromator 3 and a detector 4, a neutron slit is arranged at the center of the neutron slit plate 2, a neutron beam started by a neutron source 1 sequentially passes through the neutron slit, the first collimator 6, the neutron monochromator 3 and the second collimator 5 and finally reaches the detector 4, and in the embodiment, the first collimator 6 and the second collimator 5 are Soller collimators. The collimation angle ranges of the first collimator 6 and the second collimator 5 are 6 'to 30'. The detector 4 is a helium-3 neutron counter or BF 3 A neutron detector or a scintillator detector or a neutron imaging detector. The neutron beam is a neutron beam of a single wavelength. The center lines of the neutron slit, the first collimator 6 and the neutron monochromator 3 are positioned at the same straight line position, the center lines of the neutron monochromator 3, the second collimator 5 and the detector 4 are positioned at the same straight line position, and the detector 4 acquires the measured neutron intensity of the neutron beam.
In this embodiment, the device further comprises a regulating table, and the first collimator 6, the second collimator 5 and the neutron monochromator are all installed on the regulating table. The control component is used for controlling the postures of the first collimator 6, the second collimator 5, the neutron monochromator 3 and the detector 4, and is particularly electrically connected with the adjusting table, and the control component adjusts the postures of the first collimator 6, the second collimator 5 and the neutron monochromator 3 through controlling the adjusting table. The three adjusting tables comprise a first collimator adjusting table, a second collimator adjusting table and a neutron monochromator adjusting table, and the three adjusting tables are respectively and correspondingly arranged on the lower sides of the first collimator 6, the second collimator 5 and the neutron monochromator 3. The neutron monochromator adjusting table is a four-degree-of-freedom adjusting table capable of adjusting the posture of the neutron monochromator 3, the four-degree-of-freedom adjusting table is used for two-dimensional translation adjustment, pitching adjustment and high-precision turntable adjustment of the monochromator, the typical range of the mosaic angle of a common crystal monochromator is about 6' to 60', and in order to ensure the precision of a measurement result, the turntable rotation precision is required to be better than 0.005 degrees (0.3 '); the first collimator adjusting table and the second collimator adjusting table which are arranged at the lower parts of the first collimator 6 and the second collimator 5 are three-degree-of-freedom posture adjusting devices, the three-degree-of-freedom posture adjusting devices comprise pitching adjustment, horizontal rotation adjustment and translation adjustment, the collimation angle range of the collimator used by the three-degree-of-freedom posture adjusting devices is about 6' to 30', and the horizontal rotation adjusting precision is better than 0.005 degrees (0.3 ') in order to ensure the measuring precision.
In another embodiment, the control component comprises a motion control module and a data acquisition module, the motion control module is electrically connected with the adjusting table, the motion control module controls the postures of the first collimator, the second collimator and the neutron monochromator by controlling the rotation of the adjusting table, and the data acquisition module is used for controlling the measured neutron intensity acquired by the detector.
According to the testing method for detecting the mosaic angle distribution of the neutron monochromator, the neutron path of the neutron beam is initially calibrated, and at the moment, the diffraction surface of the neutron beam received by the neutron monochromator is the maximum intensity diffraction surface; adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction surface, and collecting neutron intensity measurement data obtained by the detector at different deviation angles to obtain measurement data containing a plurality of deviation angles and measuring neutron intensity corresponding to each deviation angle collected by the detector; carrying out Gaussian fitting on the measured data to obtain the curve half-width of the measured data; the half-width of the mosaic angle distribution of the neutron monochromator is obtained through calculation according to the half-width of the curve, the first collimation angle of the first collimator and the second collimation angle of the second collimator, only a neutron source is controlled to start a neutron beam in the whole process, the angle of the position of the neutron monochromator is regulated, data acquired by a detector are recorded, the half-width of the mosaic angle distribution of the neutron monochromator is obtained according to the acquired data, the whole measurement process is simple and convenient, and the limitation of higher equipment debugging precision requirements is avoided. In addition, the small diffraction angle range of gamma rays is not required to be limited, a complex gamma ray source and a high-resolution gamma ray detection system are not required to be designed, the half-width of a curve is only required to be obtained through Gaussian function fitting on experimental measurement data, the monochromator mosaic angle to be measured can be calculated and obtained according to a theoretical formula, data analysis is concise and visual, and the monochromator mosaic angle distribution to be measured can be intuitively and simply estimated within a certain error range.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any way; those skilled in the art can smoothly practice the application as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present application are possible in light of the above teachings without departing from the scope of the application; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application still fall within the scope of the present application.
Claims (3)
1. A test method for detecting a neutron monochromator mosaic angular distribution, characterized by: the method comprises the following steps:
step S1, controlling a neutron source to start a neutron beam, wherein the neutron beam sequentially passes through a neutron slit, a first collimator, a neutron monochromator, a second collimator and reaches a detector, and the detector acquires the measured neutron intensity of the neutron beam;
s2, primarily calibrating a neutron light path of the neutron beam, wherein a diffraction surface of the neutron monochromator for receiving the neutron beam is a maximum intensity diffraction surface;
s3, adjusting the deviation angle of the diffraction angle of the neutron monochromator from the maximum intensity diffraction plane, changing the position of the neutron monochromator according to each deviation angle, and executing the step S1 to obtain measurement data containing a plurality of deviation angles and the measured neutron intensity corresponding to each deviation angle acquired by the detector;
s4, performing Gaussian fitting on the measurement data to obtain the curve half-width of the measurement data;
step S5, calculating to obtain the mosaic angle distribution half-width of the neutron monochromator according to the curve half-width, the first collimation angle of the first collimator and the second collimation angle of the second collimator;
the step S5 is specifically to calculate the half-width Γ of the mosaic angle distribution of the neutron monochromator through the following formula (1) m Equation (1) is:
wherein ,Γm Half-width gamma-ray for neutron mosaic angle distribution 1+2+m For measuring the curve half-width of data, Γ 1 Is the first collimation angle of the first collimator, Γ 2 A second collimation angle that is a second collimator;
the calculation process of the formula (1) includes:
obtaining a theoretical expression of a curve function describing measurement data according to a mathematical model and mathematical analysis of a measurement process, wherein the theoretical expression is shown as a formula (2):
the formula (3) can be obtained through integral calculation, and the formula (3) is as follows:
relation between half-width of Gaussian function and standard errorSubstitution formula (3)Obtaining a formula (1);
wherein ,α=θ' - θ, R (γ) is a mosaic angular function curve, γ is the angle at which the diffraction angle of the neutron monochromator deviates from the ideal diffraction plane, R 0 Is an integral constant, sigma 1 、σ 2 、σ m 、σ 1+2+m The standard error of the Gaussian distribution of the experimental measurement curve is respectively the first collimator, the second collimator, the neutron monochromator and the standard error of the Gaussian distribution of the experimental measurement curve, and theta is the Bragg angle diffracted by the reflecting surface when the neutron beam along the central line direction of the first collimator and the second collimator is inlaid by the neutron monochromator by an orientation angle beta=0 ′ Is a divergence angle +.>When the neutron beam is diffracted by the reflecting surface with the embedding orientation angle beta of the neutron monochromator,for divergence angle deviating from the first collimator centerline +.>Is the divergence angle from the second collimator centerline.
2. A test method for detecting a neutron monochromator mosaic angular distribution according to claim 1, wherein: the step S2 specifically comprises the following steps: and preliminarily calibrating the center positions of the neutron slit, the first collimator, the neutron monochromator, the second collimator and the detector to coincide with the center line of the neutron beam through the laser calibration device.
3. A test method for detecting a neutron monochromator mosaic angular distribution according to claim 1, wherein: the measured data comprises a plurality of data points, each data point comprises one deviation angle and the measured neutron intensity corresponding to the deviation angle, the plurality of data points form a data curve in a coordinate system formed by the deviation angle and the measured neutron intensity, and the number of the data points is not less than 20.
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