Multi-channel trigger suitable for plasma gun emission

Abstract

The invention provides a multi-channel trigger suitable for plasma gun emission, and relates to the field of multi-channel emission triggering of plasma guns. The multi-channel trigger provided by the invention comprises a high-voltage plate, a grounding plate and a fixed plate which are arranged in sequence, and a plurality of feed-through capacitors are also arranged between the high-voltage plate and the grounding plate; two ends of the feed-through capacitor are respectively a high-voltage terminal and a grounding terminal, the high-voltage terminal is connected with the high-voltage plate, and the grounding terminal is connected with the grounding plate; an independent charging path is formed among each feed-through capacitor, the high-voltage plate and the grounding plate; a feed-through channel penetrating through the feed-through capacitor is arranged in the feed-through capacitor; the inner core of each coaxial cable and the feed-through capacitor connected with the coaxial cable form an independent trigger access, and all the trigger accesses are connected to the pseudo spark switch in parallel. Synchronous output of hundreds of trigger channels can be achieved, the trigger voltage of each trigger channel is 20 + / -0.5 kV, the trigger current is 360 + / -0.5 A, and the rising edge time of the trigger current is smaller than 10 nS.

Description

Technical Field

[0001] This invention relates to the field of multi-channel emission triggering for plasma guns, and particularly to multi-channel triggers suitable for plasma gun emission. Background Technology

[0002] Multi-channel synchronous triggering devices are a core technology for magnetic inertial confinement fusion. Existing triggering technologies, such as electrical triggering and laser triggering, cannot achieve simultaneous triggering of dozens or even hundreds of channels, and the jitter cannot be controlled within 10 ns.

[0003] Magnetic inertial confinement fusion involves hundreds of plasma guns, each with its own matching spark gap switch. The multi-channel synchronous triggering system generates a megaampere-level main current in the circuit by triggering the spark gap switch. The synchronous stability of the plasma gun main current is a key performance indicator in the plasma gun launch process. The synchronous and reliable triggering of a large number of main switches is a key factor in achieving the synchronous stability of the plasma gun main current.

[0004] In summary, there is an urgent need for a multi-channel trigger suitable for plasma gun emission. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a multi-channel trigger suitable for plasma gun emission, capable of synchronous output of hundreds of trigger channels. Each trigger channel has a trigger voltage of 20±0.5kV, a trigger current of 360±0.5A, and a trigger current rise time of <10ns.

[0006] The multi-channel trigger for plasma gun emission provided by this invention includes a high-voltage plate, a ground plate, and a fixed plate arranged sequentially. A plurality of feedthrough capacitors are further disposed between the high-voltage plate and the ground plate. The two ends of each feedthrough capacitor are a high-voltage terminal and a ground terminal, respectively. The high-voltage terminal is connected to the high-voltage plate, and the ground terminal is connected to the ground plate. Each feedthrough capacitor forms an independent charging path with respect to both the high-voltage plate and the ground plate. A feedthrough channel is provided through each feedthrough capacitor. A plurality of high-voltage fasteners are provided on the fixed plate for introducing an external coaxial cable. The inner core of the coaxial cable passes sequentially through the high-voltage fasteners and the feedthrough channel, and its insertion end is connected to the high-voltage terminal of the feedthrough capacitor through which it passes. The inner core of each coaxial cable and the feedthrough capacitor connected to it form an independent triggering path. All triggering paths are connected in parallel to a dummy spark switch.

[0007] In one feasible embodiment, a current-limiting resistor is provided between the high-voltage terminal of the feedthrough capacitor and the high-voltage plate.

[0008] In one feasible embodiment, the capacitance of the feedthrough capacitor is 1 to 10 nanofarads, and the resistance of the current-limiting resistor is 100 kilohms to 1 megohm.

[0009] In one feasible embodiment, the multi-channel trigger further includes several adapter terminals and several trigger terminals. The adapter terminals are provided with trigger adapter holes and charging adapter holes. The adapter terminals are connected to the high-voltage terminals of the feedthrough capacitor. The trigger adapter holes are connected to the feedthrough channel. The insertion end of the inner core of the coaxial cable passes through the feedthrough channel and the trigger adapter hole. The trigger terminals are connected to the adapter terminals, and the insertion end of the inner core of the coaxial cable is fixed by the trigger terminals. One end of the current-limiting resistor is disposed in the current-limiting resistor hole and connected to the current-limiting resistor hole. The other end of the current-limiting resistor is connected to the high-voltage board.

[0010] In one feasible embodiment, the number of feedthrough capacitors is 50 to 100.

[0011] In one feasible embodiment, the feedthrough capacitors are arranged in a rectangular array between the high voltage plate and the ground plane.

[0012] In one feasible embodiment, the high-voltage terminal and the grounding terminal of the feedthrough capacitor both protrude from both ends of the feedthrough capacitor. The outer diameter of the high-voltage terminal and the outer diameter of the grounding terminal are both smaller than the outer diameter of the feedthrough capacitor, and the inner diameter of the high-voltage terminal and the inner diameter of the grounding terminal are the same as the inner diameter of the feedthrough channel.

[0013] In one feasible embodiment, the trigger terminal includes a trigger head and a trigger protective cover. The trigger head is a hollow spring collet, and the trigger protective cover is disposed on the outside of the trigger head. The insertion end of the coaxial cable core is clamped in the trigger head.

[0014] In one feasible embodiment, a pseudo-spark switch trigger board is also included, which is used to control the opening and closing of the pseudo-spark switch.

[0015] This invention also provides a method for using a multi-channel trigger suitable for plasma gun emission, comprising the following steps: Step 1) First, charge the feedthrough capacitors. The high-voltage plate is used as the high-voltage electrode and the grounding plate is used as the grounding electrode. The high-voltage plate and the grounding plate are connected to the high-voltage power supply. The high-voltage power supply charges all the feedthrough capacitors at the same time through the charging circuit. Step 2) When triggered, the feedthrough capacitors act as a power source. When the dummy spark switch is turned on, all the feedthrough capacitors discharge simultaneously, causing all triggering paths to be instantly connected, thus completing the triggering process.

[0016] The multi-channel trigger for plasma gun emission provided by this invention has the following beneficial effects: This invention employs a pseudo-spark switch with low delay, low jitter, and high withstand voltage to simultaneously trigger multiple feedthrough capacitors. By setting up a charging path to precharge the feedthrough capacitors, a high voltage is ensured during triggering, thereby achieving synchronous output of hundreds of trigger channels. Each trigger channel has a trigger voltage of 20±0.5kV, a trigger current of 360±0.5A, and a trigger current rise time of <10ns. Attached Figure Description

[0017] Figure 1 This is a side view of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 3 This is a side view of the feedthrough capacitor in this invention.

[0020] Figure 4 For the present invention Figure 3 A cross-sectional view along the AA direction.

[0021] Figure 5 This is a schematic diagram of the structure of the adapter terminal of the present invention.

[0022] Figure 6 This is a schematic diagram of the trigger terminal in this invention.

[0023] Figure 7 For the present invention Figure 6 A cross-sectional view along the BB direction.

[0024] Figure 8 This is a schematic diagram of the trigger head in this invention.

[0025] Figure 9 This is a schematic diagram of the trigger protective cover in this invention. Attached Figure

[0026] High voltage board 1 Floor 2 Fixed plate 3 High-pressure fasteners 31 feedthrough capacitor 4 High voltage terminal 41 Grounding terminal 42 Heart-piercing passage 43 Current limiting resistor 5 Adapter terminal 6 Trigger adapter 61 Resistor Adapter Hole 62 Trigger terminal 7 Trigger head 71 Trigger Protective Cover 72 Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "left side", "right side", "upper side", "lower side", "above", "below", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] This invention provides a multi-channel trigger, such as Figures 1-5 As shown, the system includes a high-voltage plate 1, a grounding plate 2, and a fixing plate 3 arranged sequentially. Several feedthrough capacitors 4 are also provided between the high-voltage plate 1 and the grounding plate 2. The two ends of each feedthrough capacitor 4 are a high-voltage terminal 41 and a grounding terminal 42, respectively. The high-voltage terminal 41 is connected to the high-voltage plate 1, and the grounding terminal 42 is connected to the grounding plate 2. The high-voltage plate 1 is used to connect to an external high voltage. Each feedthrough capacitor 4 forms an independent charging path with the high-voltage plate 1 and the grounding plate 2. Each feedthrough capacitor 4 has a through-hole channel 43. The fixing plate 3 has several high-voltage fasteners 31, which are used to introduce external coaxial cables. The inner core of the coaxial cable passes sequentially through the high-voltage fasteners 31 and the through-hole channel 43, and the insertion end of the coaxial cable core is connected to the high-voltage terminal 41 of the feedthrough capacitor 4 through which it passes. The inner core of each coaxial cable and the feedthrough capacitor 4 connected to it form an independent triggering path. All triggering paths are connected in parallel to a dummy spark switch.

[0031] As an explanation, a major drawback of existing technologies is that the triggering energy of the triggering plate used is insufficient, failing to meet the energy required for triggering. Therefore, this invention innovatively employs a feedthrough capacitor 4 for charging and energy storage. During charging, the high-voltage plate 1 serves as a common high-voltage electrode to introduce external high voltage, and the grounding plate 2 serves as a common grounding electrode for grounding. Multiple parallel charging paths are formed between the high-voltage plate 1 and the grounding plate 2. Each charging path is used to charge one feedthrough capacitor 4. After the high-voltage plate 1 introduces high voltage, all charging paths are simultaneously turned on, and all feedthrough capacitors 4 are charged simultaneously. When the feedthrough capacitor 4 is fully charged, it can serve as the power source for each triggering path. When the dummy spark switch is turned on, all triggering paths are instantaneously turned on. When each triggering path is turned on, the voltage reaches 20±0.5kV, the current reaches 360±0.5A, and the current rise time is <10ns. Additionally, to support simultaneous conduction of multiple triggering paths, the dummy spark switch must possess a certain withstand voltage, typically ±20kV. Specifically, the dummy spark switch model is 4208BZ. Furthermore, the rise time of the current is related not only to the performance of the dummy spark switch but also to the transmission line used. This invention uses a coaxial cable as the transmission line for triggering, which has the advantages of low inductance and low jitter, effectively improving the rise time of the current.

[0032] As a supplementary explanation, after the coaxial cable is connected to the high-voltage fastener 31, its own insulating shell is removed, and its inner core continues to pass through the grounding plate 2 and the through-hole channel 43 in sequence. Multiple insulating posts can be set between the fixing plate 3 and the grounding plate 2 to fix the two.

[0033] In the multi-channel trigger provided in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a current-limiting resistor 5 is provided between the high-voltage terminal 41 of the feedthrough capacitor 4 and the high-voltage plate 1. For illustration, the capacitance of the feedthrough capacitor 4 is 1 to 10 nanofarads, preferably 6 nanofarads, and the resistance of the current-limiting resistor 5 is 100 kΩ to 1 MΩ, preferably 200 kΩ.

[0034] In the multi-channel trigger provided in the embodiments of the present invention, such as Figure 1 , Figure 5 and Figure 6As shown, the multi-channel trigger also includes several adapter terminals 6 and several trigger terminals 7. The adapter terminals 6 are provided with trigger adapter holes 61 and resistor adapter holes 62. The adapter terminals 6 are connected to the high-voltage terminal 41 of the feedthrough capacitor 4. The trigger adapter hole 61 is connected to the feedthrough channel 43. The inner end of the coaxial cable core passes through the feedthrough channel 43 and the trigger adapter hole 61. The trigger terminals 7 are connected to the adapter terminals 6, and the inner end of the coaxial cable core is fixed by the trigger terminals 7. One end of the current-limiting resistor 5 is disposed in the current-limiting resistor hole 5 and connected to the current-limiting resistor hole 5. The other end of the current-limiting resistor 5 is connected to the high-voltage board 1. In one feasible embodiment, the high-voltage plate 1 is provided with a resistor through hole. One end of the current-limiting resistor 5 passes through the resistor through hole and exits the high-voltage plate 1 and is soldered to the high-voltage plate 1 as a connector for external high voltage introduction. Usually, there is at least one resistor through hole as a connector for external high voltage access. However, in most cases, the number of resistor through holes matches the number of current-limiting resistors 5 so that each current-limiting resistor 5 can pass through the resistor through hole and exit the high-voltage plate 1 and be soldered to the high-voltage plate 1.

[0035] Furthermore, such as Figures 7-9 As shown, the trigger terminal 7 includes a trigger head 71 and a trigger protective cover 72. The trigger head 71 is a hollow spring collet, and the trigger protective cover 72 is located outside the trigger head 71. The inner end of the coaxial cable is clamped in the trigger head 71. For illustrative purposes, as... Figure 1 As shown, the spring collet is a commonly used clamping structure. Its front end is a tapered elastic clip. When the inner core of the coaxial cable is inserted into the spring collet, the elastic clip will be pushed open. At the same time, the elastic clip will firmly clamp the inner core of the coaxial cable according to its own elasticity. Then, by installing the trigger protection cover 72, the elastic clip can always hold the inner core of the coaxial cable.

[0036] In the multi-channel trigger provided in the embodiments of the present invention, such as Figure 4 As shown, the high-voltage terminal 41 and the grounding terminal 42 of the feedthrough capacitor 4 both protrude from both ends of the feedthrough capacitor 4. The outer diameters of the high-voltage terminal 41 and the grounding terminal 42 are both smaller than the outer diameter of the feedthrough capacitor 4, and the inner diameters of the high-voltage terminal 41 and the grounding terminal 42 are the same as the inner diameter of the feedthrough channel 43. In one feasible embodiment, the grounding plate 2 is provided with grounding holes, and the grounding terminal 42 is disposed in the grounding holes. The number of grounding holes matches the number of feedthrough capacitors 4, so that the grounding terminal 42 of each feedthrough capacitor 4 can be fixed in the grounding plate 2.

[0037] In the multi-channel trigger provided in this embodiment of the invention, the number of feedthrough capacitors 4 is 50 to 100. In one specific embodiment, the number of feedthrough capacitors 4 is 75.

[0038] In the multi-channel trigger provided in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the feedthrough capacitors 4 are arranged in a rectangular array between the high-voltage plate 1 and the ground plane 2. A matrix array refers to the feedthrough capacitors 4 being arranged regularly in a matrix manner in both the horizontal and vertical directions. In a preferred embodiment, the feedthrough capacitors 4 are arranged in a matrix array between the high-voltage plate 1 and the ground plane 2, and the dummy spark switch is connected to the fixed plate and located at the very center of the fixed plate.

[0039] The multi-channel trigger provided in this embodiment also includes a pseudo-spark switch trigger board, which is used to control the opening and closing of the pseudo-spark switch.

[0040] This invention also provides a method for using a multi-channel trigger, comprising the following steps: Step 1) First, charge the feedthrough capacitor 4. High voltage plate 1 is used as the high voltage electrode and grounding plate 2 is used as the grounding electrode. High voltage plate 1 introduces external high voltage, and all feedthrough capacitors 4 are charged at the same time. Step 2) When triggered, the feedthrough capacitor 4 serves as the power source. When the pseudo-spark switch is turned on, all feedthrough capacitors 4 discharge simultaneously, causing all triggering paths to be instantly connected, thus completing the triggering process.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A multi-channel trigger suitable for plasma gun emission, characterized in that: The system includes a high-voltage plate (1), a grounding plate (2), and a fixing plate (3) arranged in sequence. Several feedthrough capacitors (4) are also provided between the high-voltage plate (1) and the grounding plate (2). The two ends of each feedthrough capacitor (4) are a high-voltage terminal (41) and a grounding terminal (42), respectively. The high-voltage terminal (41) is connected to the high-voltage plate (1), and the grounding terminal (42) is connected to the grounding plate (2). Each feedthrough capacitor (4) forms an independent charging path with the high-voltage plate (1) and the grounding plate (2). The feedthrough capacitor (4) has a feedthrough channel (43) that passes through it. The fixing plate (3) has several high-voltage fasteners (31). The high-voltage fasteners (31) are used to introduce external coaxial cables. The inner core of the coaxial cable passes through the high-voltage fasteners (31) and the feedthrough channel (43) in sequence, and its insertion end is connected to the high-voltage terminal (41) of the feedthrough capacitor (4) through which it passes. The inner core of each coaxial cable and the feed-through capacitor (4) connected to it form an independent triggering path, and all triggering paths are connected in parallel to the pseudo-spark switch.

2. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: A current-limiting resistor (5) is provided between the high-voltage terminal (41) of the feedthrough capacitor (4) and the high-voltage plate (1).

3. The multi-channel trigger for plasma gun emission according to claim 2, characterized in that: The capacitance of the feedthrough capacitor (4) is 1 to 10 nanofarads, and the resistance of the current-limiting resistor 5 is 100 kilohms to 1 megohm.

4. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: The multi-channel trigger also includes several adapter terminals (6) and several trigger terminals (7). The adapter terminals (6) are provided with trigger adapter holes (61) and resistor adapter holes (62). The adapter terminals (6) are connected to the high voltage terminal (41) of the feedthrough capacitor (4). The trigger adapter hole (61) is connected to the feedthrough channel (43). The inner end of the coaxial cable core passes through the feedthrough channel (43) and the trigger adapter hole (61). The trigger terminals (7) are connected to the adapter terminals (6). The inner end of the coaxial cable core is fixed by the trigger terminals (7). One end of the current limiting resistor (5) is located in the current limiting resistor hole (5) and connected to the current limiting resistor hole (5). The other end of the current limiting resistor (5) is connected to the high voltage plate (1).

5. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: The number of the feedthrough capacitors (4) is 50 to 100.

6. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: The through-core capacitors (4) are arranged in a rectangular array between the high-voltage plate (1) and the grounding plate (2).

7. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: The high-voltage terminal (41) and the grounding terminal (42) of the feedthrough capacitor (4) both protrude from both ends of the feedthrough capacitor (4). The outer diameter of the high-voltage terminal (41) and the outer diameter of the grounding terminal (42) are both smaller than the outer diameter of the feedthrough capacitor (4). The inner diameter of the high-voltage terminal (41) and the inner diameter of the grounding terminal (42) are the same as the inner diameter of the feedthrough channel (43).

8. The multi-channel trigger for plasma gun emission according to claim 1, characterized in that: The trigger terminal (7) includes a trigger head (71) and a trigger protection cover (72). The trigger head (71) is a hollow spring collet, and the trigger protection cover (72) is located outside the trigger head (71). The inner end of the coaxial cable is clamped in the trigger head (71).

9. The multi-channel trigger for plasma gun emission according to claim (8), characterized in that: It also includes a pseudo-spark switch trigger board, which is used to control the opening and closing of the pseudo-spark switch.

10. The method of using the multi-channel trigger for plasma gun emission according to any one of claims 1 to 9, comprising the following steps: Step 1) First, charge the feedthrough capacitor (4). The high voltage plate (1) is used as the high voltage electrode and the grounding plate (2) is used as the grounding electrode. The high voltage plate (1) introduces external high voltage and all feedthrough capacitors (4) are charged at the same time. Step 2) When triggered, the feedthrough capacitor (4) serves as the power source. When the pseudo-spark switch is opened, all feedthrough capacitors (4) discharge simultaneously, causing all triggering paths to be instantly connected, thus completing the triggering.

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