Laser assisted gas gap switch and method of maintaining conduction thereof

Abstract

The application provides a laser-assisted gas gap switch and a conduction maintenance method thereof, and relates to the technical field of gas gap switches. The laser-assisted gas gap switch comprises a first main electrode, a second main electrode, a laser system and a sealed gas chamber. The first main electrode and the second main electrode are oppositely arranged in the sealed gas chamber, and a main discharge gap is formed between the first main electrode and the second main electrode. An edge region of one end of the first main electrode close to the second main electrode is provided with a laser action area. The laser system comprises a power supply control unit and a laser incidence head. The laser incidence head is arranged in the sealed gas chamber. The laser incidence head is used for emitting laser to the laser action area. The power supply control unit is used for controlling the laser emission mode of the laser incidence head. The application can continuously improve the conduction condition, enhance the conduction channel stability and inhibit the arc extinction phenomenon in the gas gap conduction process.

Description

Technical Field

[0001] This invention relates to the field of gas gap switch technology, and in particular to a laser-assisted gas gap switch and its conduction maintenance method. Background Technology

[0002] Gas gap switches are a commonly used type of high-voltage switching and releasing device. Their basic principle involves placing opposing electrodes within a sealed or open gas medium. When an external electric field reaches the breakdown condition or under external triggering, the gas between the electrodes ionizes and breaks down, forming a conductive channel, thereby achieving rapid connection of the high-voltage circuit. These switches have advantages such as high insulation strength, fast operating speed, high withstand voltage, and relatively simple structure, and are widely used in pulse power, high-voltage discharge, energy release, and rapid conduction control applications.

[0003] Existing gas gap switches typically employ self-breakdown triggering, electrical pulse triggering, and auxiliary electrode triggering to achieve conduction. Among these methods, electrical pulse triggering can improve the controllability of the action time to some extent. However, under conditions of high gas pressure, long gap, low current follow current, or repetitive operation, problems such as insufficient establishment of the conduction channel, insufficient arc maintenance capability, and premature arc extinction after conduction are still prone to occur.

[0004] Especially when the conduction current is small, the holding time is long, or the current fluctuates, the effective charged particle density in the gas decreases rapidly, and the arc channel is prone to contraction or interruption, leading to a decrease in the stability of the switch conduction and even affecting the consistency of subsequent repeated triggering. At the same time, repeated operation can also cause electrode surface ablation, changes in local field strength distribution, increased trigger dispersion, and deterioration of gas recovery characteristics, further aggravating the arc loss phenomenon.

[0005] Therefore, there is an urgent need to design a new type of gas gap switch that can continuously improve conduction conditions, enhance the stability of the conduction channel, and suppress arc loss during the gas gap conduction process. Summary of the Invention

[0006] This invention provides a laser-assisted gas gap switch and its conduction maintenance method to improve conduction conditions, enhance the stability of the conduction channel, and suppress arc loss.

[0007] In a first aspect, embodiments of the present invention provide a laser-assisted gas gap switch, comprising a first main electrode, a second main electrode, a laser system, and a sealed gas chamber; The first main electrode and the second main electrode are disposed opposite to each other in the sealed gas chamber, forming a main discharge gap between them; a laser action area is provided on the edge region of the first main electrode near the second main electrode. The laser system includes a power control unit and a laser incident head; the laser incident head is disposed in the sealed gas chamber; The laser incident head is used to emit laser light into the laser action area; the power control unit is used to control the laser emission mode of the laser incident head.

[0008] In one possible implementation, the laser emission mode of the laser incident head includes an arc-triggered mode and a conduction-maintaining mode; For the arc-triggered mode, the power control unit is used to control the laser incident head to emit high-peak-value pulsed laser; In the conduction-maintaining mode, the power control unit is used to control the laser incident head to emit continuous laser or quasi-continuous laser.

[0009] In one possible implementation, the first main electrode can rotate about its central axis.

[0010] In one possible implementation, the second main electrode is provided with an arc guiding region and an arc control region at one end near the first main electrode; the arc guiding region includes an arc guiding slope and / or an arc guiding groove, and the arc control region includes a spiral arc groove. The arc-guiding region is located at the end of the second main electrode near the first main electrode, opposite to the laser action region; The arc control area is located in the central region of the second main electrode near the end of the first main electrode.

[0011] In one possible implementation, the laser incident head includes an optical fiber interface, a collimation component, a focusing component, and a light-transmitting window; the collimation component and the focusing component are used to adjust the emission direction, focal position, and spot size of the laser emitted by the laser incident head.

[0012] In one possible implementation, the laser system further includes a laser isolation cavity, an angle adjustment structure, and a support structure; The laser incident head is mounted on the support structure via the angle adjustment structure; the laser incident head, the angle adjustment structure, and the support structure are disposed within the laser isolation cavity; The laser isolation cavity is used to isolate the laser incident head from the main discharge gap.

[0013] In one possible implementation, the first main electrode is made of copper-tungsten alloy and has a blackened and roughened tungsten layer covering the surface of the laser-acting region; the second main electrode is made of copper-tungsten 80 alloy.

[0014] In one possible implementation, a magnetic field control coil is provided outside the sealed gas chamber, and the magnetic field control coil generates a magnetic field perpendicular to the plane on which the laser is emitted by the laser incident head; The magnetic field is used to accelerate the transfer of the electric arc in the main discharge gap from the arc guiding region to the arc controlling region.

[0015] In one possible implementation, the laser system further includes an optical fiber; the power control unit, the optical fiber, and the laser incident head are connected in sequence.

[0016] In a second aspect, embodiments of the present invention provide a method for maintaining the conduction of a laser-assisted gas gap switch, applied to the laser-assisted gas gap switch as described in the first aspect or any implementation thereof, the method comprising: During the arc initiation stage, the power control unit controls the laser incident head to emit high-peak pulse laser towards the laser action area, so that the main discharge gap forms a local pre-ionization channel. The driving circuit of the laser-assisted gas gap switch provides the working voltage to the main discharge gap, so that the main discharge gap breaks down and the laser-assisted gas gap switch is turned on. During the conduction maintenance phase, the power control unit controls the laser incident head to emit continuous or quasi-continuous laser light into the laser action area to maintain the local pre-ionization channel. The driving circuit of the laser-assisted gas gap switch provides a working voltage to the main discharge gap so that the main discharge gap breaks down, thereby achieving the conduction maintenance of the laser-assisted gas gap switch.

[0017] This invention, through the configuration of a laser system and a laser action zone, ensures the effective establishment of the initial plasma channel induced by the laser in the main discharge gap. This enables active and precise control of the switch-on timing, overcoming the problems of large dispersion and uncontrollable timing in traditional gas gap switches that rely solely on self-breakdown. Placing the laser incident head inside a sealed gas chamber avoids optical path attenuation, window contamination, and alignment deviations caused by the laser traveling long distances from outside the gas chamber through a window to the action zone. This ensures that laser energy acts on the laser action zone via the shortest and most direct path, improving the long-term stability of laser triggering efficiency and simplifying the coupling structure between the external optical path and the gas chamber. The power control unit controls the laser... The laser emission mode of the optical incident head allows the switch to dynamically adjust the laser output characteristics according to actual application requirements, giving the switch a wider operating range and enabling it to maintain reliable triggering performance under various operating conditions. This continuously improves conduction conditions, enhances the stability of the conduction channel, and suppresses arc loss. The sealed gas chamber, as a closed space accommodating the first main electrode, the second main electrode, and the laser incident head, ensures that the composition, pressure, and purity of the gas medium in the main discharge gap are not affected by the external environment. This is the basic premise for the gas gap switch to maintain stable breakdown voltage and insulation strength. It also provides a protected working environment for the built-in laser incident head, preventing external dust, moisture, etc. from deteriorating the optical components and electrode surfaces.

[0018] The embodiments of the present invention transform the breakdown of the gas gap switch into a triggering process actively, precisely, and tunably assisted by a laser, thereby achieving control of switch conduction and suppression of arc loss in a sealed and insulated environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the laser-assisted gas gap switch provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the laser incident head provided in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the implementation process of the laser-assisted gas gap switch conduction maintenance method provided in this embodiment of the invention. Detailed Implementation

[0020] The present application will be described more clearly below with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the function of the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0021] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0022] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] In the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] Furthermore, the term "multiple" mentioned in the embodiments of this application should be interpreted as two or more.

[0026] To address the problems of unstable arc channels, premature arc extinction, and poor consistency of repeated operations in existing gas gap switches after conduction, this invention improves the conduction stability, arc loss suppression capability, and reliability of repeated operations of the gas gap switch through laser-assisted pre-ionization and conduction maintenance. The implementation of this invention is described in detail below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a laser-assisted gas gap switch provided in an embodiment of the present invention. The laser-assisted gas gap switch integrates laser pre-ionization, main discharge gap conduction, arc control and stabilization, and optical path protection, enabling the laser not only to trigger conduction during the arc initiation stage but also to continuously or intermittently provide local pre-ionization during conduction maintenance, thereby suppressing arc loss, improving conduction stability, and ensuring consistent repetitive operation.

[0027] Reference Figure 1 The laser-assisted gas gap switch includes a power control unit 1, an optical fiber 2, a laser incident head 3, a support structure 4, an angle adjustment structure 5, a laser isolation cavity 6, a first main electrode 7, a second main electrode 8, a laser action area 9, an arc guiding area 10, an arc control area 11, and a sealing gas chamber 12.

[0028] The first main electrode 7 and the second main electrode 8 are disposed opposite each other in the sealed gas chamber 12, forming a main discharge gap between them; a laser action area 9 is provided on the edge region of the first main electrode 7 near the second main electrode 8; an arc guiding area 10 and an arc control area 11 are provided on the end of the second main electrode 8 near the first main electrode 7.

[0029] For example, the ends of the first main electrode 7 and the second main electrode 8 adopt an axisymmetric rounded cap-shaped structure, which enables the main discharge gap to form a uniform or slightly non-uniform field, ensuring the stable establishment of the breakdown path after laser induction. The rounded cap-shaped electrode structure avoids the local electric field distortion and electric field concentration caused by traditional sharp-edge or asymmetrical electrode structures, allowing the potential gradient between electrodes to be smoothly distributed along the axial direction. After being irradiated by a high-peak-value pulsed laser in the laser action area, the gas medium undergoes local photoionization and forms an initial electron-ion plasma channel, thereby achieving a stable electron migration and collisional ionization process under the action of a uniform or weakly non-uniform electric field. This allows the discharge channel to preferentially expand along the laser-induced path, without random bypass breakdown caused by local strong field regions. Simultaneously, the axisymmetric structure reduces charge accumulation on the electrode surface and the local field enhancement effect, improving the consistency of the breakdown position in the main discharge gap, thereby enhancing the arc initiation stability and repetitive operation reliability after laser triggering.

[0030] Specifically, the arc guiding region 10 is located at the end of the second main electrode 8 near the first main electrode 7, opposite to the laser action region 9, and includes an arc guiding slope and / or an arc guiding groove, so that after the initial arc is formed, it can be quickly transferred from the laser action region 9 to the main flow region of the first main electrode 7, avoiding the arc root from staying in the laser incident area for a long time.

[0031] Specifically, the arc control zone 11 is located in the central region of the second main electrode 8 near the first main electrode 7, and includes a rotating arc groove, so that the arc moves along a predetermined path after being turned on, reducing local overheating and concentrated arc root erosion, thereby improving the continuous conduction capability and arc loss suppression capability.

[0032] Specifically, a magnetic field control coil is provided outside the sealed gas chamber 12 to form a magnetic field perpendicular to the laser incident plane, which accelerates the transfer of the electric arc from the arc guiding region 10 to the arc controlling region 11.

[0033] Specifically, the first main electrode 7 can rotate around its central axis, so that the laser action area 9 forms a ring-shaped region, avoiding excessive repeated excitation and ablation at a single location, thus reducing its service life.

[0034] Specifically, the first main electrode 7 can use a copper-tungsten alloy as the base material, and a blackened and roughened tungsten layer is prepared on the surface of the laser-acting region 9 to improve the laser absorption rate, enhance the local electron emission capability, and ensure the stable formation of a pre-ionization channel and initial arc root after laser irradiation. The second main electrode 8 can be integrally formed using a copper-tungsten 80 alloy to ensure the current-carrying capacity, arc erosion resistance, and arc root adhesion stability after conduction. Therefore, the laser-acting region 9 of the first main electrode 7 is easily and reliably excited by the laser, and the other parts of the first main electrode 7 can stably bear the arc and withstand ablation after conduction with the second main electrode 8, thus balancing laser triggering consistency, continuous conduction capability, and repetitive operation life.

[0035] Among them, the blackened and roughened tungsten layer is a tungsten layer that has been blackened and roughened. Specifically, it is a tungsten material that has been processed by laser surface scanning. By using the laser's transient heating, melting, vaporization and rapid solidification process, micron-level pits are formed on the tungsten surface. The surface of the tungsten layer after the treatment is blackened and rough.

[0036] The laser-assisted gas gap switch of this embodiment of the invention is equipped with a laser system, which mainly consists of a power control unit 1, an optical fiber 2, and a laser incident head 3, which is disposed inside a sealed gas chamber 12. The power control unit 1, the optical fiber 2, and the laser incident head 3 are connected in sequence, and respectively undertake the functions of laser generation and control, laser transmission, and laser directional coupling incident, so as to jointly realize the laser-assisted pre-ionization and conduction maintenance of the main discharge gap of the laser-assisted gas gap switch.

[0037] The laser incident head 3 is used to emit laser light into the laser action area 9; the power control unit 1 is used to control the laser emission mode of the laser incident head 3.

[0038] Specifically, the power control unit 1 supplies working energy to the laser source, controls the output state of the laser source to be pulsed laser, quasi-continuous laser or continuous laser, and can adjust the laser power, pulse width, repetition frequency, duty cycle and irradiation duration. It is the energy and control core of the entire laser system.

[0039] For example, the laser emission modes of the laser incident head 3 include an arc-triggered mode and a conduction-maintaining mode; For the arc-triggered mode, the power control unit 1 supplies working energy to the laser source and controls the laser source to output high-peak pulse laser, which is emitted into the laser action area 9 through the laser incident head 3, so that the main discharge gap can quickly form a local pre-ionization channel and reduce the breakdown threshold of the main discharge gap. For the conduction-maintaining mode, the power control unit 1 supplies working energy to the laser source and controls the laser source to output continuous or quasi-continuous laser, which is emitted into the laser action area 9 through the laser incident head 3, continuously providing pre-ionization to the main discharge gap to reduce the probability of premature arc extinction under low current conditions.

[0040] Fiber optic cable 2 is used to transmit the laser output from power control unit 1 to laser incident head 3. Its main function is to achieve stable long-distance transmission of laser energy and electrical isolation between the laser source side and the high-voltage discharge side. Since fiber optic cable 2 itself does not participate in conduction, it can effectively avoid the insulation design difficulties caused by directly introducing traditional electrical trigger wires into the high-voltage area.

[0041] For example, fiber 2 has good electromagnetic interference resistance and layout flexibility, and can be bent according to the spatial structure of the equipment to adapt to the laser transmission requirements under different installation conditions.

[0042] The laser-assisted gas gap switch is also equipped with a housing. The laser incident head 3 is located at the optical path interface of the housing of the laser-assisted gas gap switch, and is used to receive the laser transmitted by the optical fiber 2 and emit the laser to the laser action area 9 near the main discharge gap.

[0043] Figure 2 This is a schematic diagram of the structure of a laser incident head 3 provided in an embodiment of the present invention. (Refer to...) Figure 2 The laser incident head 3 includes an optical fiber interface 31, a collimation component 32, a focusing component 33, and a light transmission window 34.

[0044] For example, the fiber optic interface 31 is used to connect to the fiber optic cable 2; the collimation component 32 and the focusing component 33 are used to adjust the direction, focal position, and spot size of the laser beam emitted from the laser incident head 3, so that the laser is stably focused on the laser action area 9 at the edge of the main discharge gap, making the conduction path controllable; the light-transmitting window 34 is used to seal the internal components of the laser incident head 3 to prevent the internal components from being contaminated and damaged. Therefore, the laser incident head 3 of this embodiment can not only improve the coupling efficiency between the laser and the electric field of the main gap, but also make the arc initiation position more stable, thereby improving the consistency of repeated triggering and the conduction stability.

[0045] In one possible implementation, the laser system also includes a support structure 4 and an angle adjustment structure 5 for mounting the laser incident head 3 and adjusting the orientation angle of the laser incident head 3.

[0046] To ensure stable optical coupling capability and high triggering consistency of the laser system under multiple discharge conditions, the laser system in this embodiment of the invention further includes a laser isolation cavity 6, within which the laser incident head 3, support structure 4, and angle adjustment structure 5 are disposed. The laser isolation cavity 6 serves to relatively isolate the laser propagation space (including the laser incident head 3) from the main discharge gap, reducing the possibility of metal vapor, high-temperature decomposition products, and particulate matter generated by arc ablation directly entering the laser optical path, thereby maintaining the cleanliness and light transmission stability of the optical path area. In this embodiment of the invention, the laser optical axis is offset from the main arc motion direction of the main discharge gap, so that the laser propagation direction is not directly opposite to the main arc motion path. This avoids the high-temperature particle flow and sputtering material generated during the arc motion from directly impacting the optical window or intruding into the laser isolation cavity 6 along the laser optical axis direction, thereby further reducing the risk of optical path contamination and improving the reliability of the laser system in long-term operation.

[0047] This invention, through the provision of a laser system, can form a stable pre-ionization channel in a localized area of ​​the main discharge gap, lowering the breakdown threshold and improving the consistency of the arc initiation position and triggering process. By employing continuous or quasi-continuous laser irradiation, in conjunction with the arc guiding area 10, the arc control area 11, and an external magnetic field, local ionization conditions can be continuously improved after conduction, promoting the arc to transfer and move along a predetermined path, reducing the probability of arc loss, and improving the stability of continuous conduction. By setting up a laser isolation cavity 6 and staggering the laser optical axis from the main arc's main movement direction, the contamination of the optical path by arc products can be effectively reduced, maintaining the cleanliness of the optical path and the stability of laser coupling, thereby improving the long-term operational reliability and repetitive operation life of the laser-assisted gas gap switch.

[0048] See Figure 3 This invention provides a method for maintaining the conduction of a laser-assisted gas gap switch, which is applied to the laser-assisted gas gap switches in the above embodiments, and is described in detail below: In step S301, during the arc triggering stage, the power control unit controls the laser incident head to emit high-peak pulse laser towards the laser action area, so that the main discharge gap forms a local pre-ionization channel. The driving circuit of the laser-assisted gas gap switch provides working voltage to the main discharge gap so that the main discharge gap breaks down and the laser-assisted gas gap switch is turned on. In step S302, during the conduction maintenance phase, the power control unit controls the laser incident head to emit continuous or quasi-continuous laser light into the laser action area to maintain the local pre-ionization channel. The drive circuit of the laser-assisted gas gap switch provides the working voltage to the main discharge gap so that the main discharge gap breaks down, thereby achieving the conduction maintenance of the laser-assisted gas gap switch.

[0049] In this embodiment of the invention, a high-peak-value pulsed laser is used to establish an initial pre-ionization channel during the arc-triggered phase to achieve reliable conduction of the laser-assisted gas gap switch. During the conduction maintenance phase, the laser is switched to continuous or quasi-continuous to maintain this pre-ionization channel, thus extending laser assistance from a one-time triggering action to an active support mechanism throughout the entire conduction process. This staged laser control strategy effectively suppresses arc loss caused by arc root drift or local deionization during conduction, significantly improving the continuous conduction stability and arc loss suppression capability of the gas gap switch under high current or long pulse width conditions.

[0050] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0051] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A laser-assisted gas gap switch, characterized in that, It includes a first main electrode, a second main electrode, a laser system, and a sealed gas chamber; The first main electrode and the second main electrode are disposed opposite to each other in the sealed gas chamber, forming a main discharge gap between them; a laser action area is provided on the edge region of the first main electrode near the second main electrode. The laser system includes a power control unit and a laser incident head; the laser incident head is disposed in the sealed gas chamber; The laser incident head is used to emit laser light into the laser action area; the power control unit is used to control the laser emission mode of the laser incident head.

2. The laser-assisted gas gap switch as described in claim 1, characterized in that, The laser emission modes of the laser incident head include arc-triggered mode and conduction-maintained mode; For the arc-triggered mode, the power control unit is used to control the laser incident head to emit high-peak-value pulsed laser; In the conduction-maintaining mode, the power control unit is used to control the laser incident head to emit continuous laser or quasi-continuous laser.

3. The laser-assisted gas gap switch as described in claim 1, characterized in that, The first main electrode can rotate about its central axis.

4. The laser-assisted gas gap switch as described in claim 1, characterized in that, The second main electrode has an arc guiding area and an arc control area at one end near the first main electrode; the arc guiding area includes an arc guiding slope and / or an arc guiding groove, and the arc control area includes a spiral groove; The arc-guiding region is located at the end of the second main electrode near the first main electrode, opposite to the laser action region; The arc control area is located in the central region of the second main electrode near the end of the first main electrode.

5. The laser-assisted gas gap switch as described in claim 1, characterized in that, The laser incident head includes an optical fiber interface, a collimation component, a focusing component, and a light-transmitting window; the collimation component and the focusing component are used to adjust the emission direction, focal position, and spot size of the laser emitted by the laser incident head.

6. The laser-assisted gas gap switch as described in claim 1, characterized in that, The laser system also includes a laser isolation cavity, an angle adjustment structure, and a support structure; The laser incident head is mounted on the support structure via the angle adjustment structure; the laser incident head, the angle adjustment structure, and the support structure are disposed within the laser isolation cavity; The laser isolation cavity is used to isolate the laser incident head from the main discharge gap.

7. The laser-assisted gas gap switch as described in claim 1, characterized in that, The first main electrode is made of copper-tungsten alloy and has a blackened and roughened tungsten layer covering the surface of the laser action area; the second main electrode is made of copper-tungsten 80 alloy.

8. The laser-assisted gas gap switch as described in claim 4, characterized in that, A magnetic field control coil is provided outside the sealed gas chamber, and the magnetic field control coil generates a magnetic field perpendicular to the plane on which the laser is emitted by the laser incident head; The magnetic field is used to accelerate the transfer of the electric arc in the main discharge gap from the arc guiding region to the arc controlling region.

9. The laser-assisted gas gap switch as described in claim 1, characterized in that, The laser system also includes an optical fiber; the power control unit, the optical fiber, and the laser incident head are connected in sequence.

10. A method for maintaining the conduction of a laser-assisted gas gap switch, characterized in that, The method, applied to the laser-assisted gas gap switch as described in any one of claims 1 to 9, comprises: During the arc initiation stage, the power control unit controls the laser incident head to emit high-peak pulse laser towards the laser action area, so that the main discharge gap forms a local pre-ionization channel. The driving circuit of the laser-assisted gas gap switch provides the working voltage to the main discharge gap, so that the main discharge gap breaks down and the laser-assisted gas gap switch is turned on. During the conduction maintenance phase, the power control unit controls the laser incident head to emit continuous or quasi-continuous laser light into the laser action area to maintain the local pre-ionization channel. The driving circuit of the laser-assisted gas gap switch provides a working voltage to the main discharge gap so that the main discharge gap breaks down, thereby achieving the conduction maintenance of the laser-assisted gas gap switch.

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