Coaxial shielded barrel and pulse generator

Abstract

The application relates to a coaxial shielding cylinder and a pulse generator. The coaxial shielding cylinder comprises a shielding cylinder body, a shielding hole penetrating through the shielding cylinder body in the axial direction is arranged in the shielding cylinder body, the shielding cylinder body is of an insulating structure; a first connecting piece is arranged in the shielding hole and connected with the shielding cylinder body, a first through hole penetrating through the first connecting piece in the axial direction is arranged in the first connecting piece, the first connecting piece is used for being connected with a first electrode of a first end of a Marx generator terminal air gap switch, the first electrode passes through the first through hole, and the first connecting piece is of a conductive structure; and a second connecting piece is arranged in the shielding hole and is arranged in a spaced mode with the first connecting piece, a second through hole penetrating through the second connecting piece in the axial direction is arranged in the second connecting piece, and the second through hole is used for allowing a second electrode of a second end of the Marx generator terminal air gap switch to pass through, wherein the second connecting piece is of an insulating structure. The coaxial shielding cylinder can shorten the rise time of a high-voltage pulse output by the Marx generator.

Description

Technical Field

[0001] This application relates to the field of electrical pulse technology, and in particular to a coaxial shielding cylinder and a pulse generator. Background Technology

[0002] Fast rise edge pulse sources have wide applications in pulse power technology and its applications. Due to the short rise time of the pulse, the bandwidth is wide. For example, for an electrical pulse with a rise time of less than 1 ns, the bandwidth is as wide as 1 GHz or more. Therefore, after being radiated by an ultra-wideband antenna, experiments on the interaction between electronic devices and electromagnetic pulses can be carried out over a wider range, which has broad application prospects.

[0003] Currently, high-voltage pulse sources typically employ air-gap switches. However, since air-gap breakdown takes a certain amount of time—that is, from the appearance of the first effective electron to complete air-gap breakdown—if a conventional electrode is used at the output, the electromagnetic radiation will consume some energy due to the radiating antenna effect of the electrodes, affecting the accumulation and development of the corona region. Additionally, the spark channel has a certain inductance. These factors cause the actual rise time of the high-voltage pulse output by most Max generators to be significantly different from the ideal rise time. Summary of the Invention

[0004] Therefore, it is necessary to provide a coaxial shielding cylinder and pulse generator that can reduce the rise time of the pulse to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a coaxial shielding cylinder, comprising:

[0006] The shielding cylinder body has a shielding hole that extends axially through the shielding cylinder body, wherein the shielding cylinder body is an insulating structure;

[0007] A first connector is disposed in the shielding hole and connected to the shielding cylinder body. The first connector has a first through hole that extends through the first connector along the axial direction. The first connector is used to connect to the first electrode of the first end of the air gap switch at the end of the Marx generator. The first electrode passes through the first through hole. The first connector is a conductive structure.

[0008] The second connector is disposed within the shielding hole and spaced apart from the first connector. The second connector has a second through hole that extends axially through the second connector. The second through hole is used for the second electrode of the second end of the air gap switch at the end of the Marx generator to pass through. The second connector is an insulating structure.

[0009] The aforementioned coaxial shielding cylinder, by connecting the first electrode to the first connector, and since the first connector is connected to the main body of the shielding cylinder, the first electrode and the coaxial shielding cylinder form a shielded antenna structure. Due to the filling effect generated by the integral effect of the capacitor, the radiation effect of the antenna of the electrode is effectively suppressed, which is conducive to the rapid movement of charged particles to the other electrode, thereby achieving the effect of rapid breakdown of the switching gap, and thus reducing the rise time of the pulse, so that the rise edge of the high voltage pulse output by the Max generator is close to the ideal rise edge.

[0010] In one embodiment, the shielding cylinder body is grounded.

[0011] In one embodiment, the first connector and the second connector are respectively connected to the inner wall of the shielding hole, and the first connector and the second connector cooperate to seal the shielding hole to form a sealed shielding cavity between the first connector and the second connector.

[0012] In one embodiment, the shielding hole is a cylindrical hole.

[0013] In one embodiment, the first connector is made of a conductive metal material.

[0014] In one embodiment, the first connector is adapted to move within the shielding hole to move the first electrode, and the edge of the second connector away from the first connector is on the same vertical line as the edge of the adjacent shielding cylinder body.

[0015] Secondly, this application provides a pulse generator, comprising: a Marx generator and a coaxial shielding cylinder as described above, wherein a first electrode at the first end of the air gap switch at the end of the Marx generator is connected to the first connector, and the first electrode passes through the first through hole; and a second electrode at the second end of the air gap switch at the end of the Marx generator passes through the second through hole.

[0016] The aforementioned pulse generator connects the first electrode to the first connector. Since the first connector is connected to the main body of the shielding cylinder, the first electrode and the coaxial shielding cylinder form a shielded antenna structure, which effectively suppresses the radiation effect of the electrode antenna. This structure improves the electrode electric field structure, which is conducive to the rapid movement of charged particles to the other electrode, thereby achieving the effect of rapid breakdown of the switching gap, and further reducing the rise time of the pulse so that the rise edge of the high voltage pulse output by the Max generator is close to the ideal rise edge.

[0017] In one embodiment, the second connector is connected to the second electrode.

[0018] In one embodiment, the first connector and the second connector are respectively connected to the inner wall of the shielding hole, and the first connector and the second connector cooperate to seal the shielding hole to form a sealed shielding cavity between the first connector and the second connector; the first electrode and the second electrode are located inside the shielding cavity.

[0019] In one embodiment, the first electrode and the second electrode are located on the same horizontal line. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the coaxial shielding cylinder in one embodiment;

[0022] Figure 2 This is a schematic diagram of the structure after the coaxial shielding cylinder is connected to the Marx generator in one embodiment;

[0023] Figure 3 Here is a schematic diagram of a Marx generator in one embodiment;

[0024] Figure 4 Here is a discharge equivalent circuit diagram of the Marx generator in one embodiment;

[0025] Figure 5 This is a schematic diagram of a right-angle wave passing through an inductor in one embodiment;

[0026] Figure 6 This is a schematic diagram of a right-angle wave passing through an inductor equivalent circuit in one embodiment.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Coaxial shielding cylinder, 11-First connector, 12-Shielding cylinder body, 13-Second connector, 14-Shielding hole, 21-First electrode, 22-Second electrode. Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. The drawings illustrate embodiments of this application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0031] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0032] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0033] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0034] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0035] Fast rise edge pulse sources have wide applications in pulse power technology and its applications. Due to the short rise time of the pulse, the bandwidth is wide. For example, for an electrical pulse with a rise time of less than 1 ns, the bandwidth is as wide as 1 GHz or more. Therefore, after being radiated by an ultra-wideband antenna, experiments on the interaction between electronic devices and electromagnetic pulses can be carried out over a wider range, which has broad application prospects.

[0036] Currently, high-voltage pulse sources typically employ air-gap switches. However, since air-gap breakdown takes a certain amount of time—that is, from the appearance of the first effective electron to complete air-gap breakdown—if a conventional electrode is used at the output, the electromagnetic radiation will consume some energy due to the radiating antenna effect of the electrodes, affecting the accumulation and development of the corona region. Additionally, the spark channel has a certain inductance. These factors cause the actual rise time of the high-voltage pulse output by most MARX generators to be significantly different from the ideal rise time.

[0037] Currently, there are several methods to improve the pulse rising edge:

[0038] 1. The high-pressure solution involves sealing the air gap switch in a sealed chamber filled with high-pressure insulating gas, such as nitrogen or sulfur hexafluoride. These technologies have high requirements for the sealing process and require additional auxiliary mechanical facilities, making them inconvenient to use. Also, due to the above three factors, although the pulse rise edge is improved, it is still difficult to meet the requirements.

[0039] 2. Exploring the use of electrodes with different large geometric curvatures can help improve the pulse rise time. However, due to the large randomness and statistical nature of gas discharge, it is difficult to select a specific electrode shape as the optimal choice through simulation. Repeated testing is necessary, and the workload of electrode processing and testing is very complicated. The bigger problem is that research shows that although electrodes with large geometric curvatures help improve the pulse rise time, their triggering jitter increases accordingly, which reduces the reliability of the system.

[0040] To solve the above problems, such as Figure 1 and Figure 2As shown, this application provides a coaxial shielding cylinder 1, including a shielding cylinder body 12, a first connecting member 11, and a second connecting member 13. The shielding cylinder body 12 has a shielding hole 14 extending axially through the body, wherein the shielding cylinder body 12 is an insulating structure. The first connecting member 11 is disposed within the shielding hole 14 and connected to the shielding cylinder body 12. The first connecting member 11 has a first through hole extending axially through the body, and the first connecting member 11 is used to connect to a first electrode 21 at the first end of the air gap switch of the Marx generator. The first electrode 21 passes through the first through hole, and the first connecting member 11 is a conductive structure. The second connecting member 13 is disposed within the shielding hole 14 and spaced apart from the first connecting member 11. The second connecting member 13 has a second through hole extending axially through the body, and the second through hole allows a second electrode 22 at the second end of the air gap switch of the Marx generator to pass through. The second connecting member 13 is an insulating structure.

[0041] The vertical cross-section of the shielding cylinder body 12 can be elliptical, circular, or rectangular. The vertical cross-section of the shielding hole 14 can also be elliptical, circular, or rectangular.

[0042] It is understood that since the first connector 11 is connected to the shielding cylinder body 12, and the first connector 11 is used to connect to the first electrode 21 of the first end of the air gap switch at the end of the Marx generator, when the coaxial shielding cylinder 1 is connected to the Marx generator, the first electrode 21 will be connected to the shielding cylinder body 12 through the first electrode 21. Since the first connector 11 is a conductive structure and the shielding cylinder body 12 is an insulating structure, the first electrode 21 and the coaxial shielding cylinder body 12 constitute a shielded antenna structure, which is beneficial to suppress the radiation effect of the antenna of the first electrode 21 and the second electrode 22, reduce energy loss, and thus shorten the rise time of the pulse and improve the rise edge of the output pulse of the air gap switch at the end of the Marx generator.

[0043] The aforementioned coaxial shielding cylinder 1, by connecting the first electrode 21 to the first connector 11, and since the first connector 11 is connected to the shielding cylinder body 12, the first electrode 21 and the coaxial shielding cylinder 1 form a shielded antenna structure, effectively suppressing the antenna radiation effect of the electrode. This structure improves the electrode electric field structure, which is conducive to the rapid movement of charged particles to the other electrode, thereby achieving the effect of rapid breakdown of the switching gap, and further reducing the rise time of the pulse, so that the rise edge of the high voltage pulse output by the Max generator is close to the ideal rise edge.

[0044] In one embodiment, the shielding cylinder body 12 is grounded.

[0045] It is understandable that when the shielding cylinder body 12 is grounded, the shielding cylinder body 12 will form a shielding structure, which can avoid external electromagnetic interference. In addition, since the first electrode 21 is electrically connected to the coaxial shielding cylinder 1, a transmission line structure is formed inside the coaxial shielding cylinder 1, which effectively reduces the distributed inductance of the discharge circuit, thereby further improving the rising edge of the output pulse of the air gap switch at the end of the Max generator.

[0046] In one embodiment, the first connector 11 and the second connector 13 are respectively connected to the inner wall of the shielding hole 14, and the first connector 11 and the second connector 13 cooperate to seal the shielding hole 14 to form a sealed shielding cavity between the first connector 11 and the second connector 13.

[0047] The shape and size of the vertical cross-section of the first connector 11 and the second connector 13 along the vertical direction are the same as the shape and size of the vertical cross-section of the shielding hole 14, so that the first connector 11 and the second connector 13 can cooperate to close the shielding hole 14.

[0048] It is understood that when the first connector 11 and the second connector 13 are respectively connected to the inner wall of the shielding hole 14, and the first connector 11 and the second connector 13 cooperate to close the shielding hole 14, a sealed shielding cavity is formed between the first connector 11, the second connector 13 and the shielding cylinder body 12. Since the first electrode 21 passes through the first through hole and the second electrode 22 passes through the second through hole when the coaxial shielding cylinder 1 is connected to the Marx generator, the first electrode 21 and the second electrode 22 are both located in the shielding cavity. Therefore, the air gap switch at the end of the Marx generator is sealed in the shielding cavity, which is beneficial to improving the rising edge of the output pulse of the air gap switch at the end of the Marx generator.

[0049] In one embodiment, the first connector 11 is made of a conductive metal material.

[0050] The material of the first connector 11 can be a metal such as copper or iron, or it can be an alloy material.

[0051] When the material of the first connector 11 is a conductive metal, based on the characteristics of the metal, the first connector 11 has high hardness and is not easily deformed. Therefore, when the first connector 11 is connected to the first electrode 21, the first electrode 21 is fixed by the first connector 11, so that the position of the first electrode 21 will not easily change. Thus, the relative position of the first electrode 21 and the second electrode 22 will not easily change, which is beneficial to ensuring that the relative position of the first electrode 21 and the second electrode 22 remains unchanged.

[0052] It is understandable that, in application, the second electrode 22 can also be connected to the second connector 13 to fix the second electrode 22. The material of the second connector 13 is also an insulating material with high hardness and not easily deformed, so that the position of the second electrode 22 will not easily change, which helps to ensure that the relative position of the first electrode 21 and the second electrode 22 remains unchanged.

[0053] In one embodiment, the first connector 11 is adapted to move in the shielding hole 14 to move the first electrode 21, and the edge of the second connector 13 away from the first connector 11 is on the same vertical line as the edge of the adjacent shielding cylinder body 12.

[0054] In this embodiment, by allowing the first connector 11 to move within the shielding hole 14, the first electrode 21 can be moved, thereby making the distance between the first electrode 21 and the second electrode 22 adjustable. The first connector 11 and the second connector 13 are located within the shielding hole 14 of the shielding cylinder body 12. The shielding cylinder body 12 protects the first connector 11 and the second connector 13, preventing them from being subjected to external forces that could cause positional changes, thus altering the relative positions of the first electrode 21 and the second electrode 22. Furthermore, since the second connector is located within the shielding hole 14, the edge of the second connector 13 away from the first connector 11 is aligned vertically with the edge of the adjacent shielding cylinder body 12. This allows the shielding hole 14 to be sealed by the first connector 11 and the second connector 13, preventing dust from entering the shielding hole 14 and ensuring its cleanliness.

[0055] In one embodiment, such as Figure 2 As shown, Figure 2 The structural diagram shown can also serve as a structural schematic diagram of a pulse generator. This application also provides a pulse generator, including: a Marx generator and a coaxial shielding cylinder 1 as described above. The first electrode 21 of the first end of the air gap switch at the end of the Marx generator is connected to the first connector 11, and the first electrode 21 passes through the first through hole; the second electrode 22 of the second end of the air gap switch at the end of the Marx generator passes through the second through hole.

[0056] In applications, such as Figure 3 As shown, during the charging process of the Marx generator, the capacitors C at each stage are connected in parallel through a number of charging resistors R with a voltage of U. C The rectified power supply charges the capacitors, but due to the varying number of charging resistors, the voltage rise rate across each capacitor is different. The first capacitor (C) charges the fastest, and the last capacitor (C) charges the slowest. However, given a sufficiently long charging time, almost all capacitors will be charged to voltage U. cTherefore, the ground potentials of numbers 2, 4, 6, and 8 are all -U. C Points 1, 3, 5, and 7 are all at ground potential. (According to...) Figure 3 The voltage obtained by connecting rectifier V in the middle will be negative. It is easy to change the polarity; just reverse the connection of rectifier V.

[0057] During the discharge process of the Marx generator, once the first pair of spark gaps (air gap switches) F1 is broken down, the subsequent spark gaps F2, F3, and F4 will also break down rapidly in sequence, and the capacitors will be connected in series. The generator will immediately switch from the charging state to the discharging state. Therefore, the first pair of spark gaps F1 is called the "ignition spark gap".

[0058] At this point, because the charging resistors R at each stage have sufficiently large resistance values, each R branch can be approximated as an open circuit during the brief discharge process. When F1 is in U c When breakdown occurs under the action of the damping resistor r, immediately connect points 2 and 3 (damping resistor r). d (The resistance is very small), so the potential of point 3 relative to ground immediately changes from zero to -U. c (The potential at point 2), the potential at point 4 correspondingly becomes -2U. c Similarly, F3 and F4 will also be in 3U. C and 4U C The breakdown is accelerated sequentially under the potential difference. In this way, all capacitors C will be connected in series to discharge the tail resistor R2 and the wavefront capacitor C2, so that the test sample is subjected to a negative polarity impulse voltage wave with an amplitude close to "-4UCη" (where η is the utilization coefficient of the generator).

[0059] like Figure 4 The following is the discharge equivalent circuit diagram of the Marx generator. Figure 4 Based on the circuit, the relationship between the output voltage waveform and the circuit component parameters is approximately analyzed.

[0060] In approximate calculations, some necessary simplifications should be made. For example, when determining the wavefront, the existence of R2 can be ignored. In this case, the voltage across C can be expressed by the following formula:

[0061]

[0062] In the formula, the wavefront time constant is:

[0063]

[0064] Since C1 >> C2, we can approximate it as follows:

[0065] τ2≈(R 11 +R 12 C2 (3)

[0066] The above derivation ignores the actual conduction inductance of the switching gap and the breakdown delay caused by the antenna effect of the switch. However, these two factors are crucial for pulses with nanosecond-level leading edges. The influence of conduction inductance on the leading edge of the pulse is analyzed below.

[0067] Assume a right-angle wave with amplitude u1' passes through an inductor L, with point A being the impedance abrupt change point, the impedance to the left being Z1, and the impedance to the right being Z2, as follows... Figure 5 As shown. Its equivalent circuit is as follows. Figure 6 As shown. By Figure 6 It can be seen that: i L =i2', where i L Let i be the current at inductor L, and i2' be the current at inductor A. Therefore, the following loop equation can be written:

[0068]

[0069] Solving the above equation, we can obtain the current and voltage at point A when the wave passes through the inductor L, respectively:

[0070]

[0071]

[0072] In equations (5) and (6), T L Let be the time constant, and α be the voltage refractive index without inductance. Where:

[0073]

[0074]

[0075] This shows that the presence of inductance softens the leading edge of the right-angle wave.

[0076] There is currently no analytical expression for the breakdown delay caused by the antenna effect of the switch. However, it can be expected that due to the radiation effect of the antenna, some of the pulse energy will be consumed in the form of radiation, thereby reducing the intensity of the corona electric field established around the electrode and thus affecting the pulse rise edge.

[0077] Based on the above principle, this embodiment connects the coaxial shielding cylinder 1 to the air gap switch at the end of the Marx generator, and connects the first connector 11 to the shielding cylinder body 12. The first connector 11 is connected to the first electrode 21 at the first end of the air gap switch at the end of the Marx generator. When the coaxial shielding cylinder 1 is connected to the Marx generator, the first electrode 21 will be connected to the shielding cylinder body 12 through the first electrode 21. Since the first connector 11 is a conductive structure and the shielding cylinder body 12 is an insulating structure, the first electrode 21 and the coaxial shielding cylinder 1 constitute a shielded antenna structure. This helps to suppress the radiation effect of the antenna of the first electrode 21 and the second electrode 22, reduce energy loss, and thus shorten the rise time of the pulse and improve the rise edge of the output pulse of the air gap switch at the end of the Marx generator.

[0078] The aforementioned pulse generator connects the first electrode 21 to the first connector 11. Since the first connector 11 is connected to the shielding cylinder body 12, the first electrode 21 and the coaxial shielding cylinder 1 form a shielded antenna structure, which effectively suppresses the antenna radiation effect of the electrode. This structure improves the electrode electric field structure, which is conducive to the rapid movement of charged particles to the other electrode, thereby achieving the effect of rapid breakdown of the switching gap, and further reducing the rise time of the pulse so that the rise edge of the high voltage pulse output by the Max generator is close to the ideal rise edge.

[0079] In one embodiment, the second connector 13 is connected to the second electrode 22.

[0080] It is understood that the second electrode 22 is connected to the second connector 13, and the second electrode 22 can be fixed by the second connector 13. Since the second connector 13 is an insulating structure, even if the second electrode 22 is connected to the second connector 13, the second electrode 22 will not be electrically connected to the shielding cylinder body 12. Therefore, it is possible to avoid the first electrode 21 and the second electrode 22 being electrically connected and short-circuited.

[0081] The material of the second connector 13 can be an insulating material with high hardness and not easily deformed, so that the position of the second electrode 22 will not easily change, which helps to ensure that the relative position of the first electrode 21 and the second electrode 22 remains unchanged.

[0082] In one embodiment, the first connector 11 and the second connector 13 are respectively connected to the inner wall of the shielding hole 14, and the first connector 11 and the second connector 13 cooperate to seal the shielding hole 14 to form a sealed shielding cavity between the first connector 11 and the second connector 13; the first electrode 21 and the second electrode 22 are located inside the shielding cavity.

[0083] In this embodiment, by placing both the first electrode 21 and the second electrode 22 within the shielding cavity, the air gap switch at the end of the Marx generator is sealed within the shielding cavity, which helps to improve the rising edge of the output pulse of the air gap switch at the end of the Marx generator.

[0084] In one embodiment, the first electrode 21 and the second electrode 22 are located on the same horizontal line.

[0085] In this embodiment, by positioning the first electrode 21 and the second electrode 22 on the same horizontal line, the distance between them can be calculated more easily. The distance between the first electrode 21 and the second electrode 22 can be determined by calculation: the total length of the shielding cylinder minus the total length of the electrodes within the shielding hole 14 equals the length of the electrode spacing. In application, the position of the first connector 11 within the shielding hole 14 can be adjusted. Since the first connector 11 is connected to the first electrode 21, it can move the first electrode 21 within the shielding hole 14, changing the distance between the first electrode 21 and the second electrode 22. Specifically, the first connector 11 is threadedly connected to the shielding cylinder body 12. The first connector 11 has external threads on its outer periphery and internal threads on the inner wall of the shielding hole 14, allowing the first connector 11 to move within the shielding hole 14 while simultaneously connecting to the shielding cylinder body 12.

[0086] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coaxial shielding cylinder, characterized in that, include: The shielding cylinder body has a shielding hole that extends axially through the shielding cylinder body, wherein the shielding cylinder body is an insulating structure; A first connector is disposed in the shielding hole and connected to the shielding cylinder body. The first connector has a first through hole that extends through the first connector along the axial direction. The first connector is used to connect to the first electrode of the first end of the air gap switch at the end of the Marx generator. The first electrode passes through the first through hole. The first connector is a conductive structure. The second connector is disposed within the shielding hole and spaced apart from the first connector. The second connector has a second through hole that extends axially through the second connector. The second through hole is used for the second electrode of the second end of the air gap switch at the end of the Marx generator to pass through. The second connector is an insulating structure. The first connector is connected to the shielding cylinder body and the first electrode, so that the first electrode and the shielding cylinder body form a shielded antenna structure to suppress the antenna radiation effect of the first electrode and the second electrode.

2. The coaxial shielding cylinder according to claim 1, characterized in that, The shielding cylinder body is grounded.

3. The coaxial shielding cylinder according to claim 1, characterized in that, The first connector and the second connector are respectively connected to the inner wall of the shielding hole, and the first connector and the second connector cooperate to seal the shielding hole, so as to form a sealed shielding cavity between the first connector and the second connector.

4. The coaxial shielding cylinder according to claim 1, characterized in that, The shielding hole is a cylindrical hole.

5. The coaxial shielding cylinder according to claim 1, characterized in that, The first connector is made of a conductive metal material.

6. The coaxial shielding cylinder according to any one of claims 1 to 5, characterized in that, The first connector is adapted to move within the shielding hole to move the first electrode, and the edge of the second connector away from the first connector is on the same vertical line as the edge of the adjacent shielding cylinder body.

7. A pulse generator, characterized in that, include: The Marx generator and the coaxial shielding cylinder as described in any one of claims 1 to 6, wherein the first electrode of the first end of the air gap switch at the end of the Marx generator is connected to the first connector, and the first electrode passes through the first through hole; the second electrode of the second end of the air gap switch at the end of the Marx generator passes through the second through hole.

8. The pulse generator according to claim 7, characterized in that, The second connector is connected to the second electrode.

9. The pulse generator according to claim 7, characterized in that, The first connector and the second connector are respectively connected to the inner wall of the shielding hole, and the first connector and the second connector cooperate to seal the shielding hole to form a sealed shielding cavity between the first connector and the second connector; the first electrode and the second electrode are located inside the shielding cavity.

10. The pulse generator according to claim 7, characterized in that, The first electrode and the second electrode are located on the same horizontal line.

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