Fusion device divertor strain / temperature monitoring system

Abstract

The invention belongs to the technical field of nuclear fusion device application, and discloses a fusion device divertor strain / temperature monitoring system, which is characterized in that an optical fiber capillary packaging part is fixedly arranged on a divertor box body from the high field side of the divertor box body along the appearance direction of the divertor box body, and is led out from the low field side of the divertor box body to be connected to a demodulator; the strain fiber grating sensors are distributed along the optical fiber capillary packaging part and are pre-tightened and fixed at strain monitoring points of the divertor box body; the temperature fiber grating sensors are distributed along the optical fiber capillary packaging part and are located at the temperature monitoring point positions of the divertor box body; no strain fiber grating sensor is arranged on the fiber capillary packaging piece provided with the temperature fiber grating sensor. The device is suitable for multi-point dense arrangement on the divertor box body, the strain / temperature of the divertor box body can be comprehensively monitored in real time, and monitoring data are reliable and effective.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear fusion device applications, and in particular to a monitoring system for strain / temperature of a divertor of a fusion device. Background Art

[0002] Fusion energy is the ultimate ideal energy source for human society in terms of both safety and cleanliness. Moreover, fusion fuel is abundant on Earth. The deuterium content in seawater is very rich. Tritium can be produced from lithium on Earth, and its content is sufficient to meet the supply of deuterium-tritium fusion fuel.

[0003] The divertor is a core component in a tokamak fusion device. It consists of a plasma-facing section and a divertor case, which houses these sections. Located within a vacuum chamber, the divertor is exposed to high temperatures, high radiation, and high dynamic loads. Structural strain and high temperatures can cause cracks to form, propagate, and eventually lead to fatigue fracture. Therefore, real-time monitoring of the divertor case's strain and temperature is essential to identify potential hazards and enable appropriate measures to prevent damage. Summary of the Invention

[0004] The present invention aims to at least partially address one of the technical problems in the related art. To this end, one objective of the present invention is to provide a fusion device divertor strain and temperature monitoring system. The system is suitable for densely deploying multiple points on the divertor case, enabling comprehensive, real-time monitoring of the divertor case strain and temperature, providing reliable and effective monitoring data.

[0005] A system for monitoring strain / temperature of a fusion device divertor according to an embodiment of the present invention includes a strain / temperature monitoring assembly disposed on a selected divertor case within a vacuum chamber. The strain / temperature monitoring assembly includes: an optical fiber capillary package, the optical fiber capillary package being fixedly arranged on the divertor box along the outer shape of the divertor box from the high field side of the divertor box, and being led out from the low field side of the divertor box to be connected to a demodulator; strain fiber Bragg grating sensors, the strain fiber Bragg grating sensors are distributed along the optical fiber capillary package and pre-tightened and fixed at strain monitoring points of the divertor box body, the strain monitoring points being straight; A temperature fiber Bragg grating sensor is distributed along the fiber capillary package and located at a temperature monitoring point of the divertor box body, and the temperature monitoring point is straight. The strain fiber Bragg grating sensor is not arranged on the fiber capillary package where the temperature fiber Bragg grating sensor is arranged.

[0006] The operating principle of the fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention is as follows: Fiber Bragg grating (FBG) sensors and temperature FBG sensors are correspondingly arranged at strain monitoring points and temperature monitoring points on the divertor box. The FBG sensors and temperature FBG sensors transmit their respective optical signals to a demodulator via their corresponding optical fiber capillary packages. The demodulator calculates the optical signals to obtain strain and temperature data at the corresponding strain and temperature monitoring points, thereby comprehensively assessing the strain and temperature distribution on the divertor box surface and timely controlling and adjusting the divertor operating state to avoid structural damage.

[0007] The strain / temperature monitoring system for a fusion device divertor according to an embodiment of the present invention has the following advantages: 1) the strain / temperature monitoring assembly, including the optical fiber capillary package, the strain fiber Bragg grating sensor, and the temperature fiber Bragg grating sensor, has anti-electromagnetic interference capability and can monitor the strain / temperature of the divertor box in real time under harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference within a vacuum chamber. The monitoring data is reliable and effective, facilitating timely processing; 2) the strain fiber Bragg grating sensor and the temperature fiber Bragg grating sensor can be distributed at multiple points on their respective corresponding single optical fiber capillary packages, and due to their small size, can be densely arranged on the surface of the divertor box; 3) the strain / temperature monitoring assembly occupies a small space and can be arranged in a narrow space or area of ​​the divertor box to acquire relevant strain / temperature data.

[0008] In some embodiments, the optical fiber capillary package includes an optical fiber and a capillary that encapsulates the optical fiber; the strain optical fiber Bragg grating sensor includes a strain grating etched segment directly formed on the optical fiber; and the temperature optical fiber Bragg grating sensor includes a temperature grating etched segment directly formed on the optical fiber.

[0009] In some embodiments, the strain fiber Bragg grating sensor further includes a strain gauge packaging structure; the strain grating etched segment is packaged using the strain gauge packaging structure instead of the capillary packaging; the ends of the capillary adjacent to the two ends of the strain grating etched segment are fixed to the optical fiber; the two ends of the strain gauge packaging structure are respectively fixed to the ends of the capillary adjacent to the two ends of the strain grating etched segment and apply prestress to the strain grating etched segment.

[0010] In some embodiments, the strain gauge packaging structure is in a ring frame shape, including two strain gauges opposite to each other and two connecting portions respectively connected between the two ends of the two strain gauges, wherein one of the strain gauges is in contact with the surface of the divertor box; and the ends of the capillary tube adjacent to the two ends of the strain grating etched segment are respectively fixed to the two connecting portions.

[0011] In some embodiments, the temperature grating etched section is directly encapsulated in the capillary.

[0012] In some embodiments, the strain monitoring points include bends of the divertor box and locations where stress is relatively high as determined by simulations of various operating conditions of the divertor box; the temperature monitoring points include areas adjacent to the strain fiber Bragg grating sensors and locations where temperature is relatively high as determined by simulations of various operating conditions of the divertor box.

[0013] In some embodiments, the temperature monitoring points also include locations where strain is relatively small as determined by simulation of various operating conditions of the divertor box body, and the temperature monitoring points also include locations where temperature is relatively small as determined by simulation of various operating conditions of the divertor box body.

[0014] In some embodiments, the strain / temperature monitoring assembly further comprises a fixing member, which fixes the capillary tube to the divertor box.

[0015] In some embodiments, with respect to a single divertor box, the temperature fiber Bragg grating sensor is mainly located on one side of the divertor box.

[0016] In some embodiments, the strain / temperature monitoring assembly is arranged on 3 to 4 divertor boxes selected at intervals of 80° to 120° in the circumferential direction of the vacuum chamber. Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention; Figure 2 is a rendering of a fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention; Figure 3 yes Figure 1 A in the middle is an enlarged schematic diagram; Figure 4 yes Figure 1 The enlarged schematic diagram of point B in the middle; Figure 5 Schematic diagram of a strain fiber Bragg grating sensor of a fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention; Figure 6 yes Figure 5 The enlarged schematic diagram of point C in the middle; Figure 7 Schematic diagram of an application scenario of a system for monitoring strain / temperature of a fusion device divertor according to an embodiment of the present invention.

[0018] Reference numerals Vacuum chamber 1; divertor box 2; strain / temperature monitoring assembly 3; optical fiber capillary package 301; optical fiber 3011; capillary 3012; strain fiber Bragg grating sensor 302; strain grating etched section 3021; ​​strain gauge packaging structure 3022; strain gauge 30221; connecting portion 30222; temperature fiber Bragg grating sensor 303; fixing member 304; optical fiber lead-out line 4. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0020] The following combination Figures 1 to 7 The following describes a system for monitoring strain and temperature of a fusion device divertor according to an embodiment of the present invention.

[0021] like Figures 1 to 7 As shown, a fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention includes a strain / temperature monitoring assembly 3 disposed on a single divertor case 2. It should be noted that multiple divertor cases 2 are arranged 360° circumferentially within the vacuum chamber 1, for example, 48 divertor cases 2. Due to the large number of divertor cases 2, some divertor cases 2 are selected for placement of the strain / temperature monitoring assembly 3. The strain / temperature of the selected divertor cases 2 is monitored in real time, enabling a comprehensive assessment of the surface temperature and strain distribution of the divertor cases 2. This allows for timely control and adjustment of the divertor operating state to prevent structural damage.

[0022] The strain / temperature monitoring assembly 3 includes a fiber capillary package 301, a strain fiber Bragg grating sensor 302, and a temperature fiber Bragg grating sensor 303. Because the divertor box 2 is exposed to harsh conditions within the vacuum chamber 1, such as high temperature, high electromagnetic radiation, and strong electromagnetic interference, and because the ultra-high vacuum environment is sensitive to potential impurities, conventional adhesive-bonded resistive temperature / strain sensors fail to monitor the divertor box 2 under these conditions and may release gases, potentially affecting the ultra-high vacuum environment. Therefore, conventional adhesive-bonded resistive temperature / strain sensors are unsuitable for data monitoring of the divertor box 2. However, the strain fiber Bragg grating sensor 302 and the temperature fiber Bragg grating sensor 303 offer high sensitivity, high precision, and electromagnetic interference resistance, making them suitable replacements for conventional adhesive-bonded resistive temperature / strain sensors for distributed strain and temperature measurement. The optical fiber 3011 within the fiber capillary package 301 is resistant to electromagnetic interference and effectively transmits optical signals. Therefore, the strain / temperature monitoring assembly 3 can reliably and effectively monitor the strain / temperature of the divertor box 2 in harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference in the vacuum chamber 1 .

[0023] Specifically, the fiber capillary package 301 is connected from the high field side of the divertor box 2 (see Figure 1 A in the figure) is fixedly arranged on the divertor box 2 along the outer shape of the divertor box 2, from the low field side of the divertor box 2 (see Figure 1 B in the figure) and leads out through the optical fiber lead-out line 4 (see Figure 2 and Figure 7 ) is connected to a demodulator (not shown). Due to the complex shape and limited space of the divertor box 2, the fiber capillary package 301 is very thin and flexible. It can be arranged within the confined space of the divertor box 2, from the high-field side to the low-field side, along the outer surface of the divertor box 2 (including any recessed areas on the outer surface), and secured to the divertor box 2. For example, the fiber capillary package 301 is secured to the divertor box 2 via a fastener 304, making the arrangement flexible, convenient, and reasonable. The fiber capillary package 301 is routed from the low-field side and then routed through the existing integrated circuitry of the vacuum chamber 1 before connecting to the demodulator outside the vacuum chamber 1. This ensures a neat routing and eliminates interference. The optical fiber 3011 within the fiber capillary package 301 can transmit optical signals, and the demodulator can perform operations on the optical signals to obtain the desired data.

[0024] Strain fiber Bragg grating (FBG) sensors 302 are distributed along the fiber capillary package 301 and preloaded at the strain monitoring points of the divertor housing 2. These strain monitoring points are straight. The strain monitoring points of the divertor housing 2 are densely packed. The strain fiber Bragg grating (FBG) sensors 302 are mounted on the fiber capillary package 301. Due to their compact size, they can be densely preloaded and arranged at the corresponding strain monitoring points. The strain fiber Bragg grating (FBG) sensors 302 utilize a fiber Bragg grating (FBG), which is highly sensitive to changes in applied force. Changes in applied force are reflected in the FBG as changes in the grating pitch (period), causing changes in the received optical signal. A demodulator calculates the optical signal to determine the strain at the corresponding strain monitoring point. The strain fiber Bragg grating (FBG) sensors 302 require a certain preload, and the strain monitoring points must be straight to obtain valid strain data.

[0025] The temperature fiber Bragg grating (FBG) sensors 303 are distributed along the fiber capillary package 301 and located at temperature monitoring points on the divertor housing 2. These temperature monitoring points are straight. The temperature fiber Bragg grating (FBG) sensors 303 are mounted on the fiber capillary package 301 and can be placed at corresponding temperature monitoring points. The temperature fiber Bragg grating (FBG) sensors 303 utilize fiber Bragg gratings (FBGs), which are highly sensitive to ambient temperature changes. Changes in ambient temperature are reflected by changes in the grating pitch (period) of the FBG, causing changes in the received optical signal. The demodulator calculates the optical signal to determine the temperature at the corresponding temperature monitoring point. If the temperature monitoring point is not straight, deformation of the mounting position of the temperature fiber Bragg grating sensor 303 can affect the temperature measurement.

[0026] The fiber capillary package 301 on which the temperature fiber Bragg grating sensor 303 is arranged is not provided with the strain fiber Bragg grating sensor 302 (see FIG. Figures 1 to 4 ), accordingly, the temperature fiber Bragg grating sensor 303 is not arranged on the fiber capillary package 301 on which the strain fiber Bragg grating sensor 302 is arranged. This facilitates accurate monitoring of temperature and strain.

[0027] The operating principle of the fusion device divertor strain / temperature monitoring system according to an embodiment of the present invention is as follows: Fiber Bragg grating (FBG) sensors 302 and temperature FBG sensors 303 are correspondingly arranged at strain monitoring points and temperature monitoring points on the divertor box 2. The strain FBG sensors 302 and temperature FBG sensors 303 transmit their respective optical signals to a demodulator via corresponding optical fiber capillary packages 301. The demodulator calculates the optical signals to obtain strain and temperature data at the corresponding strain and temperature monitoring points, thereby comprehensively assessing the strain and temperature distribution on the surface of the divertor box 2 and timely controlling and adjusting the divertor operating state to avoid structural damage.

[0028] The strain / temperature monitoring system for a fusion device divertor according to an embodiment of the present invention has the following advantages: 1) The strain / temperature monitoring assembly 3, comprising a fiber capillary package 301, a strain fiber Bragg grating sensor 302, and a temperature fiber Bragg grating sensor 303, is resistant to electromagnetic interference and can monitor the strain / temperature of the divertor case 2 in real time under harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference within a vacuum chamber 1. The monitoring data is reliable and effective, facilitating timely processing. 2) The strain fiber Bragg grating sensor 302 and the temperature fiber Bragg grating sensor 303 can be distributed at multiple points on their respective single fiber capillary packages 301. Due to their small size, they can be densely arranged on the surface of the divertor case 2. 3) The strain / temperature monitoring assembly 3 occupies a small space and can be arranged in a narrow space or area within the divertor case 2 to acquire relevant strain / temperature data.

[0029] The strain / temperature monitoring system for the fusion device divertor of an embodiment of the present invention provides key data for monitoring the divertor case 2 by rationally arranging multiple strain fiber Bragg grating sensors 302 and temperature fiber Bragg grating sensors 303 on the surface of the divertor case 2. This system comprehensively assesses the temperature and strain distribution on the surface of the divertor case 2, and timely controls and adjusts the divertor operating state to avoid structural damage.

[0030] The fusion device divertor strain / temperature monitoring system of the embodiment of the present invention is applied to conditions with harsh working environment, limited layout space, and dense monitoring points, providing a reference for similar application scenarios.

[0031] In some embodiments, as Figure 5 and Figure 6 As shown, the optical fiber capillary package 301 includes an optical fiber 3011 and a capillary 3012 encapsulating the optical fiber 3011. The capillary 3012 encapsulates the optical fiber 3011, allowing the optical fiber capillary package 3011 to be used in the harsh environments of the vacuum chamber 1, such as high temperature, high electromagnetic radiation, and strong electromagnetic interference. The capillary 3012 is a metal capillary 3012, preferably 316L stainless steel, which has a certain degree of flexibility. The strain fiber Bragg grating sensor 302 includes a strain grating etched section 3021 directly formed on the optical fiber 3011, which is easy to manufacture and occupies a small volume. The temperature fiber Bragg grating sensor 303 includes a temperature grating etched section (not shown) directly formed on the optical fiber 3011, which is easy to manufacture and occupies a small volume.

[0032] In some embodiments, as Figure 5 and Figure 6As shown, the strain fiber Bragg grating sensor 302 further includes a strain gauge packaging structure 3022; the strain grating etched segment 3021 is packaged using the strain gauge packaging structure 3022 instead of the capillary 3012; the ends of the capillary 3012 adjacent to the two ends of the strain grating etched segment 3021 are fixed to the optical fiber 3011; the two ends of the strain gauge packaging structure 3022 are respectively fixed to the ends of the capillary 3012 adjacent to the two ends of the strain grating etched segment 3021 and apply prestress to the strain grating etched segment 3021.

[0033] The strain grating etched segment 3021 is not encapsulated by the capillary tube 3012. Instead, the ends of the capillary tube 3012 adjacent to the ends of the strain grating etched segment 3021 are secured to the optical fiber 3011. Furthermore, the strain gauge encapsulation structure 3022 encapsulates the strain grating etched segment 3021. When the strain gauge encapsulation structure 3022 is correspondingly secured to the ends of the capillary tube 3012 adjacent to the ends of the strain grating etched segment 3021, the strain grating etched segment 3021 is placed in a pre-tensioned state, thereby applying a certain prestress to the strain fiber Bragg grating sensor to ensure the effectiveness of strain data measurement. The strain gauge encapsulation structure 3022 can be secured to the ends of the capillary tube 3012 by welding (soldering).

[0034] In some embodiments, as Figure 5 and Figure 6 Shown and referenced Figures 1 to 4 The strain gauge packaging structure 3022 is ring-frame-shaped and includes two strain gauges 30221 facing each other and two connecting portions 30222 respectively connected between the two ends of the two strain gauges 30221. One of the strain gauges 30221 is in contact with the surface of the divertor box 2. The ends of the capillary tube 3012 adjacent to the two ends of the strain grating etched segment 3021 are respectively fixed to the two connecting portions 30222 (e.g., by soldering), placing the strain grating etched segment 3021 in a pre-tensioned state. This achieves the application of a certain prestress to the strain fiber Bragg grating sensor, thereby ensuring accurate and effective strain data measurement.

[0035] When the strain fiber Bragg grating sensor 302 is arranged on the surface of the divertor box 2 , one of the two strain gauges 30221 is fixed on the surface of the divertor box 2 by soldering.

[0036] Because the divertor housing 2 has a complex shape and lacks sufficient layout space, high requirements are placed on the shape and size of the strain fiber Bragg grating sensor 302 itself while ensuring effective data monitoring. Therefore, the strain gauge packaging structure 3022 is designed as a ring frame, exposing the strain grating etched segment 3021. This significantly reduces the length of the strain fiber Bragg grating sensor 302 (for example, the reduced length of the strain fiber Bragg grating sensor 302 is 30 mm), making it suitable for deployment within the limited space of the divertor housing 2. If the strain grating etched segment 3021 is fully encapsulated, the strain fiber Bragg grating sensor 302 would be larger (for example, the maximum length of the strain fiber Bragg grating sensor 302 is 100 mm) to ensure accurate and effective strain data measurement, making it impossible to deploy within the limited space of the divertor housing 2.

[0037] Furthermore, in order to monitor whether the temperature distribution of the divertor box 2 is uniform during baking, the temperature monitoring points also include the relatively small strain places, i.e., relatively safe strain places, and relatively small temperature places, i.e., relatively safe temperature places, determined by the simulation of each working condition of the divertor box 2. In the simulation results of the divertor box 2, the places with relatively safe strain and relatively safe temperature (e.g., Figure 1 A certain temperature fiber Bragg grating sensor 303 is deployed on the side of the box body in the vertical section of the middle, high and low field sides).

[0038] In some embodiments, the temperature grating etched section is directly packaged in the capillary 3012, which is convenient for packaging.

[0039] It should be noted that the optical fiber 3011 passes through the capillary 3012 and does not interfere with the capillary 3012, thereby avoiding the effect of force introduced by the deformation of the outer capillary 3012, which would interfere with the temperature monitoring result.

[0040] In some embodiments, the strain monitoring points include the bends of the divertor box 2 and the points where the stress is relatively large as determined by the simulation of various working conditions of the divertor box 2. Figure 1 The strain fiber Bragg grating sensors 302 (located at points A and B in the figure) are primarily used to monitor strain at the bends of the divertor box 2 and determine surface stress, thereby comprehensively assessing the stress conditions of the divertor box 2. Placing the strain fiber Bragg grating sensors 302 at locations with relatively high stress, as determined by simulations of various operating conditions of the divertor box 2, enables monitoring of the maximum strain at individual points. This allows for a more comprehensive assessment of the strain distribution on the surface of the divertor box 2, enabling timely control and adjustment of the divertor operating state to avoid structural damage.

[0041] In some embodiments, temperature monitoring points include areas adjacent to the strain fiber Bragg grating sensor 302 and locations with relatively high temperatures determined by simulations of various operating conditions within the divertor box 2. Due to the uneven temperature distribution across the divertor box 2, the strain fiber Bragg grating sensor 302 cannot achieve temperature self-compensation. Therefore, a temperature fiber Bragg grating sensor 303 is positioned adjacent to the strain fiber Bragg grating sensor 302 to measure the temperature at the strain measurement location and, after calculation using a demodulator, also perform temperature compensation. Similar to maximum strain monitoring, temperature fiber Bragg grating sensors 303 are also positioned at locations with relatively high temperatures determined by simulations of various operating conditions within the divertor box 2. This allows for a more comprehensive assessment of the temperature distribution on the surface of the divertor box 2, enabling timely control and adjustment of the divertor operating state to avoid structural damage.

[0042] In some embodiments, the strain / temperature monitoring assembly 3 further includes a fixture 304, which secures the capillary tube 3012 to the divertor housing 2. By clamping the capillary tube 3012 with the fixture 304 and welding (e.g., soldering) the fixture 304 to the divertor housing 2, the capillary tube 3012 is securely fixed, ensuring the validity of the monitoring results. The fixture 304 is arranged along the axis of the optical fiber capillary tube package 301 to ensure that the optical fiber 3011 is as straight as possible near the strain grating etched section 3021 and the temperature grating etched section, and to maintain a certain curvature of the optical fiber 3011 at corners to prevent damage. Specifically, the fixture 304 may be a rivet or a snap ring, but is not limited thereto. The fixture 304 is made of metal, preferably 316L stainless steel.

[0043] By providing the fixing member 304 , it is possible to ensure that the optical fiber 3011 is straight at the measurement position, reduce deformation of the optical fiber 3011 caused by the capillary 3012 , and improve the accuracy of the measurement data.

[0044] In some embodiments, with respect to a single divertor box 2 , the temperature fiber Bragg grating sensor 303 is mainly located on one side of the divertor box 2 .

[0045] Since the temperature and strain of the divertor box 2 are symmetrical, in order to simplify the arrangement, the temperature fiber Bragg grating sensor 303 is mainly located on one side surface of the divertor box 2 .

[0046] In some embodiments, the strain / temperature monitoring assembly 3 is arranged circumferentially on 3 to 4 divertor boxes 2 selected at intervals of 80° to 120° in the vacuum chamber 1 to avoid the influence of circumferential asymmetry of plasma displacement.

[0047] Specifically, the divertor box 2 is a module with a circumferential angle of 7.5°. In order to avoid the influence of the circumferential asymmetry of the plasma displacement, the arrangement is to perform strain / temperature monitoring on a total of four divertor boxes 2 with a spacing of 90°.

[0048] In some embodiments, the divertor box 2, the capillary tube 3012, the fixing member 304, and the strain gauge packaging structure 3022 are all made of 316 stainless steel.

[0049] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A fusion device divertor strain / temperature monitoring system, characterized in that: The invention comprises a strain / temperature monitoring assembly arranged on a divertor box, wherein the strain / temperature monitoring assembly comprises: an optical fiber capillary package, the optical fiber capillary package being fixedly arranged on the divertor box along the outer shape of the divertor box from the high field side of the divertor box, and being led out from the low field side of the divertor box to be connected to a demodulator; strain fiber Bragg grating sensors, the strain fiber Bragg grating sensors are distributed along the optical fiber capillary package and pre-tightened and fixed at strain monitoring points of the divertor box body, the strain monitoring points being straight; A temperature fiber Bragg grating sensor is distributed along the fiber capillary package and located at a temperature monitoring point of the divertor box body, and the temperature monitoring point is straight. The strain fiber Bragg grating sensor is not arranged on the fiber capillary package where the temperature fiber Bragg grating sensor is arranged.

2. The fusion device divertor strain / temperature monitoring system according to claim 1, characterized in that: The optical fiber capillary package includes an optical fiber and a capillary that packages the optical fiber; the strain optical fiber Bragg grating sensor includes a strain grating etched section directly formed on the optical fiber; and the temperature optical fiber Bragg grating sensor includes a temperature grating etched section directly formed on the optical fiber.

3. The fusion device divertor strain / temperature monitoring system according to claim 2, characterized in that: The strain fiber Bragg grating sensor also includes a strain gauge packaging structure; the strain grating etched segment is packaged using the strain gauge packaging structure instead of the capillary packaging; the ends of the capillary adjacent to the two ends of the strain grating etched segment are fixed to the optical fiber; the two ends of the strain gauge packaging structure are respectively fixed to the ends of the capillary adjacent to the two ends of the strain grating etched segment, and prestress is applied to the strain grating etched segment.

4. The fusion device divertor strain / temperature monitoring system according to claim 3, characterized in that: The strain gauge packaging structure is in a ring frame shape, including two strain gauges facing each other and two connecting portions respectively connected between the two ends of the two strain gauges, one of the strain gauges being in contact with the surface of the divertor box; and the ends of the capillary tube adjacent to the two ends of the strain grating etched segment are respectively fixed to the two connecting portions.

5. The fusion device divertor strain / temperature monitoring system according to claim 2, characterized in that: The temperature grating etching section is directly encapsulated in the capillary.

6. The fusion device divertor strain / temperature monitoring system according to claim 2, characterized in that: The strain monitoring points include the bends of the divertor box and locations where stress is relatively high as determined by simulations of various operating conditions of the divertor box; the temperature monitoring points include areas adjacent to the strain fiber Bragg grating sensors and locations where temperature is relatively high as determined by simulations of various operating conditions of the divertor box.

7. The fusion device divertor strain / temperature monitoring system according to claim 6, characterized in that: The temperature monitoring points also include locations where strain is relatively small as determined by simulation of various working conditions of the divertor box body, and the temperature monitoring points also include locations where temperature is relatively small as determined by simulation of various working conditions of the divertor box body.

8. The fusion device divertor strain / temperature monitoring system according to claim 2, characterized in that: The strain / temperature monitoring assembly further includes a fixing member, which fixes the capillary tube on the divertor box.

9. The fusion device divertor strain / temperature monitoring system according to any one of claims 1 to 7, characterized in that: As for a single divertor box, the temperature fiber Bragg grating sensor is mainly located on one side of the divertor box.

10. The fusion device divertor strain / temperature monitoring system according to claim 8, characterized in that: The strain / temperature monitoring components are arranged on 3 to 4 divertor boxes selected at intervals of 80° to 120° in the circumferential direction of the vacuum chamber.

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