Method and device for maintaining cleanliness of heavy laser amplifier structures for controlled nuclear fusion

Abstract

The application discloses a clean keeping method and device for a heavy laser amplifier structural member used for controllable nuclear fusion, and belongs to the technical field of optical equipment and high-cleanliness sealing detection. The device comprises a to-be-detected structural member, a first blind plate, a second blind plate and a third blind plate. The first blind plate and the second blind plate are respectively sealed and fixed at two ends of the to-be-detected structural member, and form a closed cavity. The second blind plate is provided with a connecting hole, the third blind plate is installed in the connecting hole and is sealed through a sealing ring, and the third blind plate is provided with an interface for connecting a gas-tightness testing element. The device further comprises an adjustable movable supporting block for protecting a flexible sealing section. The application improves testing universality through the modular third blind plate, prevents deformation of the flexible section through the movable supporting block, and effectively realizes clean keeping and reliable gas-tightness verification of the large structural member in combination with a systematic cleaning and leakage detection process.

Description

Technical Field

[0001] This invention relates to the field of optical equipment for controlled nuclear fusion and high-cleanliness sealing and testing technology, specifically to a method and apparatus for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion. Background Technology

[0002] The global energy transition is accelerating, highlighting the inherent limitations of fossil fuels and nuclear fission energy. Renewable energy is constrained by intermittency and struggles to meet the demand for stable nuclear energy. Controlled nuclear fusion, as the "ultimate clean energy" that mimics the energy production principle of stars, is widely recognized as a key path to solving long-term energy security and sustainable development for humanity due to its core advantages such as abundant fuel, high energy density, safety and controllability, environmental friendliness, and zero carbon emissions.

[0003] The devices used in controlled nuclear fusion have extremely high requirements for energy conversion efficiency, beam quality, and long-term operational stability. While achieving pulse energy gain and power enhancement, the device must maintain a high degree of cleanliness internally. This requires life-cycle control of internal cleanliness to avoid damage to internal precision components and ensure stable and reliable system operation.

[0004] Large structural components (such as optical lens barrels, vacuum chambers, and sealed enclosures) require extremely high levels of internal cleanliness. Dust, oil, fibers, and other contaminants inside these components can absorb, scatter, or reflect light, leading to light energy loss and, in severe cases, rendering the entire optical system malfunction. For vacuum or gas-filled equipment, contaminants may also adhere to sealing surfaces, causing leaks. Therefore, after precision cleaning of the structural components, effective measures must be taken to maintain their internal cleanliness, and an airtightness test must be conducted before assembly to ensure that the sealing performance meets design requirements.

[0005] In existing technologies, the cleanliness of large structural components is usually maintained by immediately sealing the ports with blind flanges after cleaning and continuously introducing clean gas into the interior. However, the following problems are encountered in actual operation: First, the port dimensions and flange forms of structural components of different models or batches vary, requiring specially designed and manufactured blind flanges and test interface tooling, resulting in high tooling costs, long preparation cycles, and poor tooling versatility; Second, some large structural components have flexible sealing sections (such as bellows or rubber expansion joints) between their two ends to compensate for thermal deformation or assembly tolerances. During the pressurization or depressurization of the airtightness test, changes in internal pressure can cause excessive stretching or collapse of the flexible section, resulting in damage or even failure of the seal. Existing test equipment lacks protective measures for this flexible section; Third, the cleaning process is often not thorough enough, and contaminants are easily left in blind holes, corners, welds, and other areas. Furthermore, during subsequent assembly and transportation, open test interfaces can lead to secondary contamination, affecting cleanliness; Fourth, when the airtightness test fails, there is a lack of systematic leak location and repair procedures. Operators often rely on experience to repeatedly disassemble and reassemble, which is inefficient and may damage the structural components.

[0006] Therefore, developing an airtightness testing device and method that can improve the versatility of testing fixtures, protect flexible sealing sections, ensure cleanliness throughout the process, and provide a complete leak handling solution is of great significance for ensuring the reliable operation of large structural components, reducing manufacturing costs, and improving production efficiency. Summary of the Invention

[0007] The present invention aims to overcome the shortcomings of the prior art and provide a method and apparatus for maintaining the cleanliness of structural components of heavy-duty laser amplifiers for controlled nuclear fusion.

[0008] The technical solution adopted in this invention is as follows: A cleanliness maintenance device for structural components of a heavy-duty laser amplifier used in controlled nuclear fusion includes: The structural component under test has a first port and a second port at its two ends. The first port is closed by a first blind plate and the second port is closed by a second blind plate. The first blind plate and the second blind plate are respectively sealed to the structural component under test and together form a closed cavity. The second blind plate is provided with a connection hole. The third blind flange is installed in the connection hole of the second blind flange and is sealed to the second blind flange through the third sealing ring. The third blind plate has at least one interface for connecting an airtightness test element.

[0009] Furthermore, the first blind plate, the second blind plate, and / or the third blind plate are made of alloy material and are provided with weight reduction grooves and / or lifting grooves.

[0010] Furthermore, the structural component under test is provided with a flexible sealing section between the first port and the second port, and also includes a movable support block. The movable support block is a rigid component located on both sides of the flexible sealing section, which is used to prevent the flexible sealing section from collapsing or being excessively stretched during the airtightness test or transportation.

[0011] Furthermore, the movable support block comprises two parts, each equipped with a groove and a slider. The slider can slide within the groove to adjust the amount of extension and retraction, and a fixing screw is provided in the middle of the slider to fix the movable support block.

[0012] Furthermore, the interface is provided with threaded holes for mounting pressure gauge connecting rods and / or hydraulic quick couplings.

[0013] Furthermore, it also includes a plug that can be detachably connected to the interface, which is used to seal the interface after the airtightness test.

[0014] Furthermore, a method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion includes the following steps: S1: Clean the inside and outside of the structural component to be tested; S2: Install the first blind plate, the second blind plate and the third blind plate in sequence at the port of the structural component to be tested, and set a sealing ring between each blind plate and the structural component to form a closed test chamber; S3: Install an airtightness test element at the interface of the third blind plate; S4: Fill the sealed test chamber with clean gas to the preset pressure; S5: Pressure monitoring monitors changes in pressure within the chamber to determine if the airtightness is up to standard.

[0015] Further cleaning steps include: spraying and cleaning the top surface, blind holes, pin holes, corner areas, and weld areas of the structural component to be tested, and then drying them with clean compressed air.

[0016] Furthermore, in step S4, the cleanliness of the gas being introduced is not lower than ISO 8 level, the initial pressure is 2000Pa±200Pa, and the pressure holding time is not less than 10 minutes.

[0017] Furthermore, if the airtightness fails in step S5, the leak point is located by visual inspection, pure water spraying or leak detector, and the connection, weld or sealing surface is repaired before the airtightness test is repeated.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention incorporates the first and second blind flanges as inherent components of large structural components, with standard connection holes only on the second blind flange. A detachable third blind flange centrally houses the airtightness testing interfaces. The third blind flange employs a standardized design, adaptable to connection holes of different sizes of the second blind flange, thus making it suitable for airtightness testing of various types of large structural components. Users only need to replace the third blind flange or the testing element, eliminating the need to redesign an entire sealing fixture for each structural component. This significantly reduces fixture manufacturing costs and experimental preparation time, and improves the versatility and reusability of the testing equipment.

[0019] The cleaning process focuses on spraying key areas prone to dirt accumulation, such as the top surface, blind holes, pin holes, corners, and welds, and then using clean compressed air to dry them sequentially, prioritizing areas that are difficult to dry. This effectively removes dust, oil, fibers, and other contaminants. During assembly, each blind flange and structural component is elastically sealed with a fluororubber sealing ring. Combined with the high rigidity design of the weight-reducing aluminum alloy blind flange, a reliable sealed test chamber is formed. After the experiment is passed, the interface is sealed with a plug with a silicone gasket to prevent contaminants from entering during transportation, thus achieving full-cycle cleanliness maintenance from cleaning to testing to transportation.

[0020] The experimental method of this invention provides a tiered positioning strategy, from visual inspection and pure water spraying to professional testing instruments, after leaks are detected by pressure monitoring. It also provides specific repair measures for different types of leaks, such as those at connection points, welds, and sealing surfaces. This method is logically clear, highly operable, and can quickly locate and effectively repair leaks, avoiding unnecessary rework and significantly improving the efficiency and success rate of airtightness tests. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of one side of the first blind plate of the present invention; Figure 3 This is a schematic diagram of the structure of the second blind plate of the present invention; Figure 4 for Figure 3 A cross-sectional view of AA; Figure 5 This is a structural schematic diagram of other structural components to be tested.

[0022] Marked in the image: 1-Structure to be tested; 2-First port; 3-Second port; 4-First blind plate; 5-Second blind plate; 6-Connecting hole; 7-Interface; 8-Flexible sealing section; 9-Modible support block; 10-Plug; 11-Third blind plate. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example 1 In this embodiment, as Figure 1-5 As shown, a cleanliness maintenance device for a heavy-duty laser amplifier structure used in controlled nuclear fusion includes a structure under test, a first blind plate, a second blind plate, and a third blind plate. The structure under test is a large box-like component in an optical system used in controlled nuclear fusion or other equipment with high cleanliness requirements, whose cleanliness requirements are far greater than those of ordinary components. It has a first port and a second port at its two ends. The first port is closed by the first blind plate, and the second port is closed by the second blind plate. The first and second blind plates are respectively sealed to the port flanges of the structure under test via rubber sealing rings and secured with screws. The first and second blind plates, together with the structure under test, form a closed cavity. A connection hole, which is a stepped hole or a threaded hole, is provided in the center or at a suitable position of the second blind plate for installing the third blind plate. The third blind plate is sealed to the connection hole of the second blind plate via a third sealing ring and secured with screws. The third blind plate has at least one interface, such as a threaded hole, for connecting airtightness testing elements such as pressure gauges and quick connectors.

[0026] In actual use, the first and second blind plates are permanent or semi-permanent components of the structure under test (i.e., part of the large structural component itself), requiring only temporary connection to the air source and testing instruments during airtightness tests. Directly machining multiple complex interfaces on the second blind plate would compromise its structural integrity, and the specifications of the second blind plates vary between different structural component models, leading to incompatibility in the testing fixtures. Therefore, a standardized connection hole is provided on the second blind plate, and all testing interfaces are centrally arranged via a third blind plate. This ensures the integrity of the second blind plate as part of the structural component while also achieving modularity of the testing interfaces. The third blind plate can be designed as a standard part, adaptable to connection holes of different specifications of the second blind plate, thereby greatly improving the versatility of the experimental setup.

[0027] With the above setup, the first and second blind flanges form an integrated closed cavity with the structural component under test, reducing the need for additional sealing in later use; the third blind flange, as a replaceable interface module, can be quickly replaced according to different testing requirements and is suitable for airtightness tests of various large structural components, reducing tooling costs.

[0028] Furthermore, the first blind plate, the second blind plate, and / or the third blind plate are made of alloy material and are provided with weight reduction grooves and / or lifting grooves.

[0029] The first, second, and third blind flanges are all made of aluminum alloy. To reduce overall weight and facilitate manual handling and hoisting, weight-reducing grooves are machined into the non-load-bearing areas of the blind flanges. Additionally, a hoisting groove is provided on the top edge or side of each blind flange; this groove can be a threaded eyelet hole or a T-slot for connecting eyelet screws or slings. Specifically, the weight-reducing grooves of the first and second blind flanges are annular or grid-like recesses, and the hoisting grooves are symmetrically arranged on both sides of the blind flange.

[0030] Large structural components are inherently heavy, and using solid steel plates for blind flanges would significantly increase the overall weight, hindering assembly and transportation. Aluminum alloys, with their low density and sufficient strength, combined with a weight-reduction groove design, can minimize weight while maintaining sealing rigidity. The lifting groove allows for stable lifting of the blind flange using crane equipment during installation and disassembly, preventing bumps or damage to the sealing surface caused by manual handling. This reduces the overall weight of the experimental setup, improving assembly efficiency and operational safety; the lifting groove also facilitates rapid assembly and disassembly of the blind flange, reducing experimental preparation time.

[0031] Furthermore, the structural component under test is provided with a flexible sealing section between the first port and the second port, and also includes a movable support block. The movable support block is a rigid component located on both sides of the flexible sealing section, which is used to prevent the flexible sealing section from collapsing or being excessively stretched during the airtightness test or transportation.

[0032] The structural component under test has a flexible sealing section between its first and second ports, specifically a bellows structure or a silicone rubber expansion joint. To prevent this flexible sealing section from collapsing (negative pressure deformation) or overstretching (positive pressure expansion) during pressurization in the airtightness test or during transportation, the experimental apparatus also includes a movable support block. The movable support block is mounted on rigid components on both sides of the flexible sealing section, for example, fixed to the rigid shell or flange of the structural component under test. The length direction of the movable support block is parallel to the axis of the flexible sealing section, and its two ends abut against or connect to the rigid components on both sides, thereby limiting the axial displacement range of the flexible sealing section.

[0033] During the pressurization process in the airtightness test, the positive pressure inside the cavity causes the flexible sealing section to expand outward, resulting in axial elongation. Conversely, if the pressure is released too quickly after the test or if internal pressure fluctuates during transport, negative pressure may occur, causing the flexible sealing section to collapse inward. These deformations can damage the flexible sealing section itself and affect the sealing effect and experimental accuracy. The movable support block, through mechanical limiting, maintains the natural length of the flexible sealing section throughout the test and during transport, or allows for controlled deformation within a small range, preventing it from exceeding its elastic limit. This effectively prevents abnormal deformation of the flexible sealing section during airtightness testing or transport, extends the service life of the seal, and ensures the reliability of experimental results and the safety of the structural components.

[0034] Furthermore, the movable support block comprises two parts, each equipped with a groove and a slider. The slider can slide within the groove to adjust the amount of extension and retraction, and a fixing screw is provided in the middle of the slider to fix the movable support block.

[0035] The movable support block comprises two parts: the first part has a groove, and the second part has a slider that slidably embeds into the groove. The groove is a long, narrow through groove or a dovetail groove, and the slider mates with it to form a sliding pair. By sliding adjustment, the overall length of the movable support block can be changed to accommodate the free length or preset stretch of flexible sealing sections of different specifications. A fixing screw is located in the middle of the slider. This screw passes through an elongated hole at the bottom of the groove and is screwed into the threaded hole of the slider. After adjustment, tightening the fixing screw locks the length of the movable support block. Both ends of the movable support block are connected to rigid components on both sides of the flexible sealing section via bolts or pins.

[0036] The original length of the flexible sealing section varies depending on the structural components under test, and a certain amount of pre-tension or pre-compression may be required depending on the actual working conditions. Fixed-length support blocks are not universally applicable. A sliding block structure enables continuous length adjustment, which is locked using fixing screws, allowing the same movable support block to adapt to various sizes and working conditions. Simultaneously, the adjustable structure allows the flexible sealing section to be adjusted to its optimal initial state before the experiment (e.g., slight stretching to avoid wrinkles), thereby further improving sealing reliability. The movable support block has an adjustable length, high versatility, and flexible installation; the locking mechanism ensures the stability of the support length during the experiment, thus precisely controlling the deformation of the flexible sealing section.

[0037] Furthermore, the interface is provided with threaded holes for mounting pressure gauge connecting rods and / or hydraulic quick couplings.

[0038] The interface on the third blind flange is a threaded hole for mounting a pressure gauge connecting rod or a hydraulic quick-connect coupling. Specifically, the pressure gauge is threaded to the third blind flange via a connecting rod with external threads, and the connecting rod has a vent hole inside. The hydraulic quick-connect coupling can be directly screwed into the threaded hole for connecting to an external clean air source. This interface design allows for quick assembly and disassembly of the pressure gauge and the air inlet line, while ensuring reliable sealing. Air tightness tests require simultaneous pressure monitoring and gas filling; using two separate interfaces would increase leakage risk and manufacturing costs. Using the same threaded hole to achieve both functions via a tee or interchangeable connection simplifies the structure. However, a better approach is to have two or more threaded holes on the third blind flange, dedicated to the pressure gauge and quick-connect coupling respectively. Threaded interfaces offer high connection strength and good sealing, capable of withstanding experimental pressures; standard thread specifications ensure interchangeability between the pressure gauge and quick-connect coupling, facilitating maintenance and replacement.

[0039] Furthermore, it also includes a plug that can be detachably connected to the interface, which is used to seal the interface after the airtightness test.

[0040] The experimental setup also includes a plug with external threads that match the threaded hole of the third blind flange interface, and a silicone gasket is provided on the end face of the plug. After the airtightness test is passed, the pressure gauge and quick connector are removed, the plug is screwed into the threaded hole and tightened, so that the silicone gasket forms an elastic seal with the surface of the third blind flange.

[0041] After the airtightness test is completed, the structural component under test needs to be transferred to the assembly station or put into direct use. If the interface on the third blind flange is open, dust, oil, fibers, and other contaminants from the external environment will enter the interior of the structural component through the interface, rendering the previous cleaning and cleanliness maintenance ineffective. Therefore, the interface must be temporarily sealed with a plug. The plug, together with a soft gasket, can ensure a long-term seal without damaging the threads.

[0042] Furthermore, a method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion includes the following steps: S1: Thoroughly clean the inside and outside of the structural component to be tested to remove contaminants such as dust, oil, and fibers.

[0043] S2: Install a first blind plate at the first port of the structural component under test, install a second blind plate at the second port, and install a third blind plate on the connection hole of the second blind plate. A fluororubber sealing ring is provided between each blind plate and the structural component, and the components are fastened with screws to form a closed test chamber.

[0044] S3: Install airtightness testing elements, such as pressure gauges and hydraulic quick-connectors, at the interface of the third blind flange, and connect the quick-connectors to a clean air source.

[0045] S4: Open the gas source valve and slowly fill the closed test chamber with clean gas until the pressure reaches the preset value.

[0046] S5: Turn off the gas supply, start pressure maintenance, continuously monitor the pressure change in the cavity, and judge whether the airtightness is qualified based on the pressure drop.

[0047] This method provides a complete and operable airtightness test procedure, ensuring that large structural components can be effectively sealed and tested for airtightness after cleaning. The method is simple, reliable, and suitable for industrial sites.

[0048] Furthermore, in the S1 cleaning step of the above method, the specific steps include: repeatedly spraying and cleaning difficult-to-clean areas such as the top surface, blind holes, pin holes, corner areas, and weld areas of the structural component under test using a spraying device. The cleaning medium is a cleaning agent or pure water that meets cleanliness requirements. After spraying, visually inspect all areas to ensure they are fully moistened. Subsequently, use clean, dry compressed air to sequentially dry the surface and pores of the parts, prioritizing the drying of blind holes, through holes, and corner areas to prevent residual liquid from flowing out and causing secondary contamination during subsequent assembly. Finally, wipe the surface of the parts with a lint-free cloth or white silk cloth to check for dirt and oil stains.

[0049] The complex internal structure of large structural components can easily trap contaminants. If not thoroughly cleaned, residual particles may move with the airflow and adhere to sealing surfaces or optical elements during subsequent airtightness tests. Prioritizing spraying and drying key areas is crucial because liquids are difficult to drain from these areas, and delayed treatment would lead to incomplete drying. Cleanliness testing validated the cleaning effectiveness.

[0050] Furthermore, in step S4, the clean gas introduced into the sealed test chamber is compressed air or nitrogen, with a cleanliness level not lower than ISO 8. During the inflation process, the pressure source valve should be opened slowly to allow the pressure to rise steadily, with an initial target pressure of 2000 Pa ± 200 Pa positive pressure. Once the pressure reaches this range, the pressure source valve is closed, and pressure holding begins for at least 10 minutes. The pressure holding start time and pressure value are recorded, with pressure readings recorded every 1-2 minutes during the pressure holding period.

[0051] The cleanliness level requirement is to prevent the introduced gas from carrying contaminants and compromising the previous cleaning results. A positive pressure of 2000 Pa is a suitable testing pressure, which will not cause excessive stress damage to structural components while effectively exposing minor leaks. Holding the pressure for at least 10 minutes is to obtain sufficient pressure decay data and avoid misjudgments caused by accidental factors such as temperature fluctuations. A pressure tolerance of ±200 Pa takes into account the actual errors in pressure gauge accuracy and inflation control.

[0052] Furthermore, if the airtightness fails in step S5, the leak point is located by visual inspection, pure water spraying or leak detector, and the connection, weld or sealing surface is repaired before the airtightness test is repeated.

[0053] If the pressure drop exceeds the allowable range or obvious leakage occurs during the pressure holding period, the airtightness is deemed unqualified (00), and the following leakage detection and repair steps should be performed: First, conduct a visual inspection, focusing on whether there are cracks, pores, or loose bolts at each connecting flange, weld, and sealing surface.

[0054] If there are no obvious abnormalities in the appearance, continuously spray pure water on the suspected area and observe whether bubbles continuously emerge, so as to accurately locate the leak point.

[0055] For minor or hidden leaks, use leak detectors (such as helium mass spectrometers or ultrasonic leak detectors) for more precise detection.

[0056] After locating the leak point, take repair measures according to the type: if the connection is loose, retighten the bolts and replace the sealing ring; if the weld is leaking, repair the weld and grind it smooth; if the sealing surface is leaking, check the flatness and smoothness, and grind the sealing surface or replace the sealing element if necessary.

[0057] After the repair is completed, repeat steps S1 to S5 to conduct the airtightness test again until it passes.

[0058] The above description is merely a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A cleanliness maintenance device for structural components of a heavy-duty laser amplifier used in controlled nuclear fusion, characterized in that, include: The structural component under test has a first port and a second port at its two ends. The first port is closed by a first blind plate, and the second port is closed by a second blind plate. The first blind plate and the second blind plate are respectively sealed to the structural component under test and together with the structural component under test, they form a closed cavity. The second blind plate is provided with a connection hole. The third blind plate is installed in the connection hole of the second blind plate and is sealed to the second blind plate through the third sealing ring; The third blind plate is provided with at least one interface for connecting an airtightness testing element.

2. The cleanliness maintenance device for the structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 1, characterized in that, The first blind plate, the second blind plate, and / or the third blind plate are made of alloy material and are provided with weight reduction grooves and / or lifting grooves.

3. A cleanliness maintenance device for a heavy-duty laser amplifier structure for controlled nuclear fusion according to claim 1, wherein a flexible sealing section is provided between the first port and the second port of the structure under test, characterized in that, It also includes movable support blocks, which are rigid components disposed on both sides of the flexible sealing section to prevent the flexible sealing section from collapsing or being excessively stretched during airtightness testing or transportation.

4. A cleanliness maintenance device for structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 3, characterized in that, The movable support block comprises two parts, each having a groove and a slider. The slider can slide within the groove to adjust the amount of extension and retraction. A fixing screw is provided in the middle of the slider to fix the movable support block.

5. A cleanliness maintenance device for structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 1, characterized in that, The interface is provided with a threaded hole, which is used to install a pressure gauge connecting rod and / or a hydraulic quick coupling.

6. A cleanliness maintenance device for structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 5, characterized in that, It also includes a plug that is detachably connected to the interface, the plug being used to seal the interface after the airtightness test is completed.

7. A method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion, applied to the cleanliness maintenance device for structural components of a heavy-duty laser amplifier for controlled nuclear fusion as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Clean the inside and outside of the structural component to be tested; S2: Install the first blind plate, the second blind plate and the third blind plate in sequence at the port of the structural component to be tested, and set a sealing ring between each blind plate and the structural component to form a closed test chamber; S3: Install an airtightness test element at the interface of the third blind plate; S4: Fill the sealed test chamber with clean gas to the preset pressure; S5: Pressure monitoring chamber pressure changes to determine if airtightness is up to standard.

8. The method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 7, characterized in that, The cleaning steps include: spraying and cleaning the top surface, blind holes, pin holes, corner areas, and weld areas of the structural component to be tested, and then drying them with clean compressed air.

9. The method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 7, characterized in that, In step S4, the cleanliness of the gas being introduced is not lower than ISO 8 level, the initial pressure is 2000Pa±200Pa, and the pressure holding time is not less than 10 minutes.

10. The method for maintaining the cleanliness of structural components of a heavy-duty laser amplifier for controlled nuclear fusion according to claim 7, characterized in that, If the airtightness fails in step S5, the leak point is located by visual inspection, pure water spraying or leak detector, and the connection, weld or sealing surface is repaired before the airtightness test is repeated.

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