Device and method for measuring neutron region parameters of neutron generator
By using a combination of mobile slide rails and signal conformance acquisition instrument in the neutron generator, the problem of inaccurate measurement of neutron region parameters is solved, and the accurate measurement of neutron region parameters of neutron generators is achieved, ensuring product quality and reliability of experimental data.
Patent Information
- Application Number
- CN202411414186.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-01-10
AI Technical Summary
In actual applications, the existing DT or DD neutron generators with α timing are inaccurate in measurement of neutron area parameters due to product size processing errors and installation errors, which affects the reference data for product quality and subsequent experimental measurements.
A neutron region parameter measurement device for neutron generators is designed, including a moving slide rail, a neutron detector and a signal conformity acquisition device, and the neutron detector is driven to move the neutron detector in the X-axis and Y-axis planes through the moving slide rail. , and use the signal conformance collector to measure the correlation between the neutron detector signal and the α signal, to determine the intensity distribution and boundary of the neutron region.
Accurate measurement of neutron region parameters of α-timed DT or DD neutron generators is achieved, ensuring product quality and providing important experimental measurement reference data.
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Figure CN119291754A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of non-destructive measurement of nuclear material properties, and in particular to a device and method for measuring neutron region parameters of a neutron generator. Background Art
[0002] DT or DD neutron generator with α timing (also called associated particle neutron generator, tagged neutron generator) has a wide range of application value in the field of nuclear technology applications. The nuclear reaction equation for generating neutrons is as follows:
[0003] D+ 2 H→ 3 He+n E n =2.45MeV
[0004] E 3He =0.82MeV
[0005] D+ 3 H→ 4 He+n E n =14.1MeV
[0006] E 4He =3.5MeV
[0007] In the above nuclear reaction process, the neutrons and alpha particles (4He or 3He) produced by each fusion reaction are one-to-one related in time and azimuth. When the alpha particles in a certain area are detected by the alpha particle detector, the time and azimuth of the DT neutron associated with the alpha detector are also completely determined.
[0008] During the engineering development process, deuterium-tritium targets, D beams, and α particle detectors all have certain product size processing errors and installation errors. When the DT or DD neutron generators with α timing actually produced are working, the parameters of the neutron area associated with the time and space of the α particle detector signal will be slightly different. Measuring and determining the neutron intensity uniformity and area boundaries at the boundaries of the neutron-associated area is very important for evaluating and ensuring product quality, and is also a reference data for users to use for subsequent experimental measurements. Summary of the invention
[0009] The purpose of the present application is to provide a device and method for measuring the neutron region parameters of a neutron generator, so as to achieve accurate measurement of the neutron region quality parameters (intensity distribution and region boundaries) of the time-space correlation of the α signal of the produced α-timing DT or DD neutron generator.
[0010] To solve the above problems, in a first aspect, the present application provides a device for measuring neutron region parameters of a neutron generator, comprising a movable slide rail, a neutron detector, and a signal coincidence collector;
[0011] The movable slide rail comprises an X-axis slide rail and a Y-axis slide rail which are perpendicular to each other;
[0012] The neutron detector is fixed to the movable slide rail and moves within the plane defined by the X-axis slide rail and the Y-axis slide rail;
[0013] The signal coincidence collector performs coincidence measurement on the signal of the neutron detector and the α signal of the α-timing neutron generator.
[0014] In some embodiments, a main body bracket is also included to support the movable slide rail.
[0015] In some embodiments, a movable slide rail driving controller is further included, which is used to drive the neutron detector to move within a plane defined by an X-axis slide rail and a Y-axis slide rail.
[0016] In some embodiments, the sensitive area of the neutron detector has a neutron gamma resolution capability, and the diameter of the neutron detector is less than or equal to 1 / 3 of the boundary size of the associated neutron region to be detected.
[0017] In some embodiments, the coincidence delay and coincidence window time of the coincidence measurement are determined by the distance between the neutron generator target and the neutron detector and the flight time and spread of the DD or DT neutrons.
[0018] In a second aspect, the present application provides a method for measuring a neutron region parameter of a neutron generator, using the above-mentioned device for measuring a neutron region parameter of a neutron generator, the method comprising:
[0019] The plane defined by the X-axis slide rail and the Y-axis slide rail is parallel to the conical bottom surface of the associated neutron emission region, and the total travel area of the neutron detector in the plane is larger than the conical bottom surface of the associated neutron emission region;
[0020] Start the alpha timed neutron generator;
[0021] After the signal coincidence acquisition instrument sets the coincidence parameters, the α timing signal output by the neutron generator is used as the gate opening coincidence signal, and the neutron coincidence count rate of the neutron detector is measured to obtain the associated neutron count rate at the corresponding position;
[0022] Move the neutron detector to the next position and repeat the above measurement;
[0023] The system moves point by point in the measurement area and measures, thereby obtaining the associated neutron intensity distribution and the associated neutron area boundary in the measurement area.
[0024] The beneficial effects of the present application are as follows: the device for measuring the neutron region parameters of the neutron generator of the present application is directly used for measuring the neutron region quality parameters (intensity distribution and region boundaries) of the time-space correlation of the α signal of an α-timing DT or DD neutron generator. This measurement result is very important for evaluating and ensuring the product quality of the neutron generator, and is also an important reference data for users for subsequent experimental measurements. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The schematic diagram of the existing DT or DD neutron generator with α timing;
[0026] Figure 2 A schematic diagram of the structure of a device for measuring neutron region parameters of a neutron generator of the present application;
[0027] Figure 3 This is a schematic diagram of a device for measuring neutron region parameters of a neutron generator in the present application. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0031] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0033] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.
[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0035] In order to accurately measure the neutron region quality parameters (intensity distribution and region boundaries) of the time-space correlation of the α signal of the produced α timing DT or DD neutron generator, the present application provides a device and method for measuring the neutron region parameters of the neutron generator, such as Figure 2-Figure 3 shown.
[0036] Among them, the schematic diagram of the existing DT or DD neutron generator with α timing is as follows Figure 1 shown.
[0037] In the first aspect, the device for measuring the neutron region parameters of the neutron generator of the present application includes a movable slide rail, a neutron detector 3, and a signal coincidence collector 4. The movable slide rail includes an X-axis slide rail 1 and a Y-axis slide rail 2 that are perpendicular to each other. The neutron detector 3 is fixed to the movable slide rail and moves in a plane defined by the X-axis slide rail 1 and the Y-axis slide rail 2. The plane is parallel to the conical bottom surface 8 of the associated neutron emission area, and the total travel area of the neutron detector 3 in the plane is larger than the conical bottom surface 8 of the associated neutron emission area. The signal coincidence collector 4 performs coincidence measurement on the signal of the neutron detector 3 and the α signal of the α-timing neutron generator 6.
[0038] The small-sized fast-response neutron detector 3 is fixed on a slide rail that can move precisely in the XY axis, thereby achieving precise movement and positioning of the neutron detector 3 in the plane area to be measured.
[0039] By adopting the coincidence measurement method of α timing signal and neutron detector signal, the measurement of neutron regional quality parameters (intensity distribution and regional boundary) of α signal time and space correlation is realized.
[0040] In some embodiments, the device for measuring neutron region parameters of a neutron generator of the present application further includes a main body support 5 for supporting a movable slide rail.
[0041] In some embodiments, the device for measuring neutron region parameters of the neutron generator of the present application further includes a movable slide rail drive controller 7 for driving the neutron detector 3 to move within a plane defined by the X-axis slide rail 1 and the Y-axis slide rail 2 .
[0042] In some embodiments, the neutron detector 3 has a neutron gamma resolution capability. The diameter of the sensitive area of the neutron detector 3 is much smaller than the boundary size of the neutron area to be detected.
[0043] In some embodiments, the diameter of the sensitive area of the neutron detector 3 is less than or equal to 1 / 3 of the border size of the associated neutron region to be detected. Preferably, the diameter of the sensitive area of the neutron detector 3 is 1 / 6 of the border size of the associated neutron region to be detected.
[0044] In some embodiments, the coincidence delay and coincidence window time of the coincidence measurement are determined by the distance between the target of the neutron generator 6 and the neutron detector 3 and the flight time and spread of the DD or DT neutrons.
[0045] In a second aspect, the present application provides a method for measuring neutron region parameters of a neutron generator, using the above-mentioned device for measuring neutron region parameters of a neutron generator, the method comprising:
[0046] Start the α timing neutron generator 6. After the signal coincidence collector 4 sets the coincidence parameters, the α timing signal output by the neutron generator is used as the gate opening coincidence signal, and the neutron coincidence count rate of the neutron detector 3 is measured to obtain the associated neutron count rate at the corresponding position.
[0047] The neutron detector 3 is moved to the next position and the above-mentioned measurement is repeated.
[0048] The system moves point by point in the measurement area and measures, thereby obtaining the associated neutron intensity distribution and the associated neutron area boundary in the measurement area.
[0049] The device and method for measuring neutron region parameters of the neutron generator of the present application realize accurate measurement of the neutron region quality parameters (intensity distribution and region boundaries) of the time-space correlation of the α signal of the produced α timing DT or DD neutron generator 6. This measurement result is very important for evaluating and ensuring the quality of neutron generator products, and is also an important reference data for users for subsequent experimental measurements.
[0050] Example 1
[0051] like Figure 2-Figure 3 shown.
[0052] The measuring device of the neutron region parameters of the neutron generator of this embodiment comprises a main body support 5, a precisely positioned X-axis slide rail 1 and a Y-axis slide rail 2, a small-sized fast-response neutron detector 3, an XY slide rail drive controller 7 and a signal coincidence collector 4. Among them, the diameter of the sensitive area of the neutron detector 3 is much smaller than the boundary size of the neutron region to be measured. The neutron detector 3 is fixed on the moving slide rail and can be precisely moved on the plane determined by the XY slide rail. The signal coincidence collector 4 performs coincidence measurement on the detector signal and the α signal of the α-timing neutron generator, and its coincidence delay and coincidence window time are determined by the distance between the neutron generator target and the neutron detector and the flight time and width of the DD or DT neutron.
[0053] The measurement principle diagram of a method for measuring neutron region parameters of a neutron generator in this embodiment is as follows: Figure 3 shown.
[0054] The device for measuring the neutron region parameters of the neutron generator of this embodiment is installed so that the XY plane determined by the X-axis and Y-axis moving slide rails is parallel to the conical bottom surface 8 of the associated neutron emission region, and the total travel area of the neutron detector 3 in the XY axis is larger than the conical bottom surface 8 of the associated neutron emission region.
[0055] Start the α-timed neutron generator 6, and after the signal coincidence collector 4 sets the coincidence parameters, measure the neutron coincidence count rate of the neutron detector 3, and the associated neutron count rate at the corresponding position can be obtained. The neutron detector 3 is moved to the next position by the XY moving slide drive controller 7 to repeat the above measurement. By moving and measuring point by point in the entire measurement area, the associated neutron intensity distribution and the associated neutron area boundary in the entire measurement area can be obtained.
Claims
1. A device for measuring neutron region parameters of a neutron generator, characterized in that: It includes a moving slide rail, a neutron detector, and a signal coincidence collector; The movable slide rail comprises an X-axis slide rail and a Y-axis slide rail which are perpendicular to each other; The neutron detector is fixed to the movable slide rail and moves in a plane defined by the X-axis slide rail and the Y-axis slide rail; the plane is parallel to the conical bottom surface of the associated neutron emission region, and the total travel area of the neutron detector in the plane is larger than the conical bottom surface of the associated neutron emission region; The signal coincidence collector performs coincidence measurement on the signal of the neutron detector and the α signal of the α-timing neutron generator.
2. The device for measuring neutron region parameters of a neutron generator according to claim 1, characterized in that: It also includes a main body bracket, which is used to support the movable slide rail.
3. The device for measuring neutron region parameters of a neutron generator according to claim 1, characterized in that: It also includes a movable slide rail driving controller for driving the neutron detector to move within a plane defined by the X-axis slide rail and the Y-axis slide rail.
4. The device for measuring neutron region parameters of a neutron generator according to claim 1, characterized in that: The neutron detector has neutron gamma resolution capability, and a diameter of a sensitive area of the neutron detector is less than or equal to 1 / 3 of a boundary size of an associated neutron region to be detected.
5. The device for measuring neutron region parameters of a neutron generator according to claim 1, characterized in that: The coincidence delay and coincidence window time of the coincidence measurement are determined by the distance between the neutron generator target and the neutron detector and the flight time and broadening of the DD or DT neutrons.
6. A method for measuring neutron region parameters of a neutron generator, characterized in that: A device for measuring neutron region parameters of a neutron generator according to claims 1 to 6 is used, and the method comprises: The α-timing neutron generator is started; after the signal coincidence collector sets the coincidence parameters, the α-timing signal output by the neutron generator is used as the door opening coincidence signal, and the neutron coincidence count rate of the neutron detector is measured to obtain the associated neutron count rate at the corresponding position; Move the neutron detector to the next position and repeat the above measurement; The system moves point by point in the measurement area and measures, thereby obtaining the associated neutron intensity distribution and the associated neutron area boundary in the measurement area.