Faraday cup measuring device for measuring beam intensity

Abstract

The utility model discloses a Faraday cup measuring device for measuring beam intensity, which belongs to the field of beam measurement, and comprises an inner cylinder, an outer cylinder, an insulating connecting piece and an iris mechanism, the inner cylinder and the outer cylinder are connected through the insulating connecting piece, the iris mechanism comprises a fixed plate, a rotating plate and a plurality of blades, the fixed plate is fixedly connected with the end part of the inner cylinder, and the rotating plate is fixedly connected with the end part of the inner cylinder. The rotating plate rotates relative to the fixed plate, the blade is arranged between the fixed plate and the rotating plate, a first sliding groove is formed in the rotating plate, a second sliding groove is formed in the fixed plate, a first protrusion and a second protrusion are arranged on the surfaces of the two sides of the blade respectively, the first protrusion is clamped in the first sliding groove, and the second protrusion is clamped in the second sliding groove; the multiple blades are sequentially arranged in the circumferential direction of the inner cylinder, a through hole is defined by the multiple blades, and beam in the inner cylinder penetrates through the through hole to flow out. Therefore, the Faraday cup measuring device not only can measure the beam intensity during an experiment, but also can provide beams with different sizes of beam spots.

Description

Technical Field

[0001] This utility model belongs to the field of beam measurement technology, specifically relating to a Faraday cylinder measuring device for measuring beam intensity. Background Technology

[0002] A particle accelerator is a device that uses electric and magnetic fields to accelerate charged particles to extremely high speeds, and it is an important scientific research and application device. In particle physics and accelerator physics, beam intensity is an important physical quantity that is directly related to the acceleration, transmission, and interaction of particle beams with matter. Beam intensity refers to the number of particles passing through a unit cross-sectional area per unit time.

[0003] The most common device for measuring beam intensity is the Faraday cup. A Faraday cup consists of an inner and an outer cylinder. The inner cylinder collects charged particles from the beam, while the outer cylinder shields it from electromagnetic fields. The beam intensity is obtained by measuring the charge collected in the inner cylinder. Sometimes, a small hole is opened at the bottom of the Faraday cup. This allows a portion of the beam from the inner cylinder to pass through the hole during experiments to collect charge. This emitted beam can then be used for target-firing experiments at an accelerator, enabling simultaneous measurement and subsequent target-firing experiments. However, because the size of the small hole at the bottom of the Faraday tube is fixed, it cannot meet the requirements of different experiments for different beam spots. For example, when conducting experiments on target materials of different sizes, thicknesses and materials, different beam spot sizes are required. When conducting experiments on target materials of different sizes, different beam spot sizes are required. And when the experimental requirement is to first use a small beam spot and then a large beam spot, the size of the beam spot needs to be adjusted. Therefore, the applicability of the Faraday tube is limited and cannot meet different experimental needs. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a Faraday cylinder measuring device for measuring beam intensity. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] In a first aspect, this utility model provides a Faraday cylinder measuring device for measuring beam intensity, comprising:

[0006] The inner cylinder is used to collect charged particles, and it has openings at both ends.

[0007] The outer cylinder is fitted over the inner cylinder to shield it from external electromagnetic interference.

[0008] An insulating connector is provided between the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder are connected by the insulating connector;

[0009] The iris recognition mechanism includes a fixed plate, a rotating plate, and multiple blades. The fixed plate is fixedly connected to the end of the inner cylinder. The rotating plate rotates relative to the fixed plate. The blades are disposed between the fixed plate and the rotating plate. The rotating plate is provided with a first sliding groove, and the fixed plate is provided with a second sliding groove. The two sides of the blades are respectively provided with a first protrusion and a second protrusion. The first protrusion is engaged in the first sliding groove, and the second protrusion is engaged in the second sliding groove. The multiple blades are arranged sequentially along the circumference of the inner cylinder, and the multiple blades form a perforation between them. The beam in the inner cylinder flows out through the perforation.

[0010] When the rotating plate rotates, it drives the blades to rotate and slide along the first and second slides, so that multiple blades can open or close to adjust the size of the perforation.

[0011] In one embodiment of the present invention, the first groove is a hexagonal annular groove, which includes six rectangular grooves. The first protrusion is a rectangular protrusion. There are six blades, and the first protrusions of the six blades are respectively engaged in the six rectangular grooves.

[0012] The second slide groove has six sections, and the second protrusion is a cylindrical protrusion. The second protrusion of the six blades is respectively engaged in the six second slide grooves.

[0013] In one embodiment of the present invention, the fixing plate includes a bottom plate and an annular side plate, the bottom plate and the annular side plate together form a receiving cavity, and the rotating plate is disposed in the receiving cavity and rotates relative to the annular side plate;

[0014] The base plate includes an annular portion and six inclined portions. The axis of the annular portion and the axis of the inner cylinder are on the same straight line. The six inclined portions are arranged sequentially along the circumference of the annular portion. One end of the inclined portion is connected to the annular portion, and the other end is connected to the annular side plate. The second slide is provided on the inclined portion. The inclined portion is radially inclined relative to the annular portion. The length direction of the second slide is the same as the length direction of the inclined portion.

[0015] The rotating plate has through holes, and the stream in the inner cylinder flows out through the through holes, perforations and the central hole of the annular part in sequence.

[0016] In one embodiment of this utility model, the iris mechanism further includes a lever, a first guide hole on the outer cylinder, a second guide hole on the annular side plate, the lever passes through the first guide hole and the second guide hole and is connected to the rotating plate, the first guide hole is an elongated hole extending circumferentially along the outer cylinder, the second guide hole is an elongated hole extending circumferentially along the annular side plate, and the first guide hole and the second guide hole are parallel.

[0017] In one embodiment of this utility model, a slot is provided on the rotating plate, the slot including a first opening facing the bottom plate and a second opening facing the annular side plate, and one end of the lever is engaged in the slot;

[0018] One of the slot and the lever has a positioning protrusion, and the other has a positioning groove. The positioning protrusion and the positioning groove engage with each other.

[0019] In one embodiment of this utility model, a negative electrode ring is also included, and the negative electrode ring and the iris mechanism are respectively connected to the two ends of the inner cylinder.

[0020] In one embodiment of the present invention, a first insulating ring is further included, which is fixedly connected to the end of the inner cylinder, and the negative electrode ring is fixedly connected to the first insulating ring.

[0021] In one embodiment of this utility model, the first insulating ring is fixedly connected to one end face of the inner cylinder along its axial direction, and three mounting bosses are provided on the other end face of the first insulating ring along its axial direction. The three mounting bosses are evenly distributed along the circumference of the first insulating ring, and the negative electrode ring is mounted on the mounting bosses.

[0022] In one embodiment of this utility model, the insulating connector includes a second insulating ring and a third insulating ring, which are arranged sequentially along the axial direction of the inner cylinder. The inner ring surfaces of the second and third insulating rings are fixedly connected to the inner cylinder, and the outer ring surfaces of the second and third insulating rings are fixedly connected to the outer cylinder.

[0023] In one embodiment of the present invention, three first connecting bosses and three second connecting bosses are respectively provided on the outer ring surfaces of the second insulating ring and the third insulating ring. The three first connecting bosses are evenly distributed along the circumference of the second insulating ring, and the three second connecting bosses are evenly distributed along the circumference of the third insulating ring.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] In the above-described scheme of this application, the Faraday cylinder measuring device includes an inner cylinder, an outer cylinder, an insulating connector, and an iris mechanism. The inner cylinder is used to collect charged particles, and its two ends are open. The outer cylinder is fitted over the inner cylinder to shield it from interference from external electromagnetic fields, thereby improving the measurement accuracy of the Faraday cylinder measuring device. The insulating connector is located between the inner and outer cylinders, and the inner and outer cylinders are connected by the insulating connector. The iris mechanism includes a fixed plate, a rotating plate, and multiple blades. The fixed plate is fixedly connected to the end of the inner cylinder, and the rotating plate is positioned relative to the fixed plate. The plate rotates, and the blades are positioned between the fixed plate and the rotating plate. The rotating plate has a first sliding groove, and the fixed plate has a second sliding groove. The two sides of the blades have a first protrusion and a second protrusion, respectively. The first protrusion is engaged in the first sliding groove, and the second protrusion is engaged in the second sliding groove. Multiple blades are arranged sequentially along the circumference of the inner cylinder, and perforations are formed between the multiple blades. The stream in the inner cylinder flows out through the perforations. When the rotating plate rotates, it drives the blades to rotate and slide along the first and second sliding grooves, so that the multiple blades can open or close to adjust the size of the perforation. With this structure, when the rotating plate rotates, the limiting fit between the first groove and the first protrusion allows the rotating plate to drive the blades to rotate. At the same time, the limiting fit between the second groove and the second protrusion allows the blades to slide along the first and second grooves while rotating, thus enabling multiple blades to rotate and open or close. This allows adjustment of the aperture size of the perforation formed by the multiple blades, and consequently, adjustment of the beam spot size of the beam emitted from the perforation. This allows the Faraday cylinder measuring device to not only measure beam intensity during experiments but also provide beams with different beam spot sizes for experiments, improving the applicability of the Faraday cylinder measuring device and enabling it to meet different experimental needs.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is an exploded view of the Faraday cylinder measuring device in an embodiment of this utility model. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the Faraday cylinder measuring device in an embodiment of this utility model;

[0029] Figure 3 This is a top view of the Faraday cylinder measuring device in an embodiment of this utility model. Figure 1 ;

[0030] Figure 4 This is a top view of the Faraday cylinder measuring device in an embodiment of this utility model. Figure 2 ;

[0031] Figure 5This is an exploded view of the iris mechanism in an embodiment of this utility model;

[0032] Figure 6 This is a cross-sectional view of the Faraday cylinder measuring device in an embodiment of this utility model;

[0033] Figure 7 This is an exploded view of the Faraday cylinder measuring device in an embodiment of this utility model. Figure 2 .

[0034] Reference numerals: 1-Inner cylinder, 2-Outer cylinder, 3-Insulating connector, 31-Second insulating ring, 32-Third insulating ring, 4-Iris mechanism, 41-Lever, 42-Rotating plate, 43-Blade, 44-Fixed plate, 5-Negative electrode ring, 6-First insulating ring. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0036] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, this utility model embodiment provides a Faraday cylinder measuring device for measuring beam intensity, including an inner cylinder 1, an outer cylinder 2, an insulating connector 3, and an iris mechanism 4. The inner cylinder 1 is used to collect charged particles, and its two ends are open. The outer cylinder 2 is sleeved outside the inner cylinder 1 to shield the inner cylinder 1 from interference from external electromagnetic fields. The insulating connector 3 is disposed between the inner cylinder 1 and the outer cylinder 2, and the inner cylinder 1 and the outer cylinder 2 are connected by the insulating connector 3. The iris mechanism 4 includes a fixed plate 44, a rotating plate 42, and multiple blades 43. The fixed plate 44 is fixedly connected to the end of the inner cylinder 1, and the rotating plate 42 is positioned relative to the fixed plate. The blade 43 is positioned between the fixed plate 44 and the rotating plate 42. The rotating plate 42 has a first groove, and the fixed plate 44 has a second groove. The two sides of the blade 43 have a first protrusion and a second protrusion, respectively. The first protrusion is engaged in the first groove, and the second protrusion is engaged in the second groove. Multiple blades 43 are arranged sequentially along the circumference of the inner cylinder 1, and a perforation is formed between the multiple blades 43. The stream in the inner cylinder 1 flows out through the perforation. When the rotating plate 42 rotates, it drives the blades 43 to rotate and slide along the first and second grooves, so that the multiple blades 43 can open or close to adjust the size of the perforation.

[0037] In some embodiments of this application, the inner cylinder 1 is a cylindrical body with openings at both ends, and the material of the inner cylinder 1 is oxygen-free copper.

[0038] In some embodiments of this application, the outer cylinder 2 is a cylindrical body with openings at both ends, and the outer cylinder 2 is made of stainless steel.

[0039] In some embodiments of this application, the insulating connector 3 may be made of polytetrafluoroethylene.

[0040] In some embodiments of this application, the iris mechanism 4 is a rotary opening and closing mechanism for driving multiple blades 43 to rotate.

[0041] In some embodiments of this application, the fixed plate 44, the rotating plate 42, and the blade 43 are all made of oxygen-free copper.

[0042] In some embodiments of this application, the Faraday cylinder measuring device can be applied to various particle accelerators, ion implantation devices, and electron beam irradiation devices.

[0043] In some embodiments of this application, the above-described Faraday cylinder measuring device is used to measure the beam intensity in real time during beam-target interaction.

[0044] In the above-described scheme of this application, the Faraday cylinder measuring device includes an inner cylinder 1, an outer cylinder 2, an insulating connector 3, and an iris mechanism 4. The inner cylinder 1 is used to collect charged particles, and both ends of the inner cylinder 1 are open. The outer cylinder 2 is fitted outside the inner cylinder 1 to shield the inner cylinder 1 from interference from external electromagnetic fields, thereby improving the measurement accuracy of the Faraday cylinder measuring device. The insulating connector 3 is disposed between the inner cylinder 1 and the outer cylinder 2, and the inner cylinder 1 and the outer cylinder 2 are connected by the insulating connector 3. The iris mechanism 4 includes a fixed plate 44, a rotating plate 42, and multiple blades 43. The fixed plate 44 is fixedly connected to the end of the inner cylinder 1, and the rotating plate 42 is fixed relative to the fixed plate 44. Plate 44 rotates, and blades 43 are disposed between fixed plate 44 and rotating plate 42. Rotating plate 42 is provided with a first sliding groove, and fixed plate 44 is provided with a second sliding groove. The two sides of blade 43 are respectively provided with a first protrusion and a second protrusion. The first protrusion is engaged in the first sliding groove, and the second protrusion is engaged in the second sliding groove. Multiple blades 43 are arranged sequentially along the circumference of inner cylinder 1, and perforations are formed between multiple blades 43. The stream in inner cylinder 1 flows out through the perforations. When rotating plate 42 rotates, it drives blades 43 to rotate and slide along the first and second sliding grooves, so that multiple blades 43 can open or close to adjust the size of the perforation. With this structure, when the rotating plate 42 rotates, the limiting fit between the first groove and the first protrusion allows the rotating plate 42 to drive the blades 43 to rotate. Simultaneously, the limiting fit between the second groove and the second protrusion allows the blades 43 to slide along the first and second grooves while rotating, enabling multiple blades 43 to open or close. This allows adjustment of the aperture size of the perforation formed by the multiple blades, and consequently, adjustment of the beam spot size emitted from the perforation. This allows the Faraday cylinder measuring device to not only measure beam intensity but also provide beams with different beam spot sizes for experiments, improving its applicability and enabling it to meet diverse experimental requirements. For example, the aperture can be adjusted according to target materials of different sizes, thicknesses, and materials; or according to the different sizes of the target area; or according to experimental requirements such as first using a small beam spot followed by a large beam spot, etc.

[0045] In some embodiments of this application, such as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the first sliding groove is a hexagonal annular groove, which includes six rectangular grooves. The first protrusion is a rectangular protrusion, and there are six blades 43. The first protrusions of the six blades 43 are respectively engaged in the six rectangular grooves. The second sliding groove has six sections, and the second protrusions are cylindrical protrusions. The second protrusions of the six blades 43 are respectively engaged in the six second sliding grooves. With this structure, when the rotating plate 42 rotates, it can drive the six blades 43 to rotate simultaneously. While rotating, the six blades 43 slide in the six rectangular grooves and the six second sliding grooves respectively, so that the six blades 43 can rotate and open and close. The perforation formed by the six blades 43 is a hexagonal hole.

[0046] In some embodiments of this application, six rectangular grooves are connected end to end to form a hexagonal annular groove.

[0047] In some embodiments of this application, the blade 43 includes a triangular portion and a rectangular portion, and when the six blades 43 are in the closed state, such as Figure 3 As shown, the sides of the triangular portions of two adjacent blades 43 are in contact, and the vertices of the triangular portions of all six blades 43 are located at the center of the rotating plate 42. The first protrusion is provided at the end of the rectangular portion. When the six blades 43 are in the open state, as... Figure 4 As shown, the six blades 43 rotate and form a hexagonal perforation between them. The first protrusion slides along the first groove, and the second protrusion slides along the second groove. The vertex of the triangular portion of one of the blades 43 abuts against the side of the triangular portion of the adjacent blade 43.

[0048] In some embodiments of this application, the fixed plate 44 includes a base plate and an annular side plate, which together form a receiving cavity. The rotating plate 42 is disposed within the receiving cavity and rotates relative to the annular side plate. The base plate includes an annular portion and six inclined portions. The axis of the annular portion and the axis of the inner cylinder 1 are on the same straight line. The six inclined portions are arranged sequentially along the circumference of the annular portion, with one end of the inclined portion connected to the annular portion and the other end connected to the annular side plate. A second sliding groove is disposed on the inclined portion, which is radially inclined relative to the annular portion. The length direction of the second sliding groove is the same as the length direction of the inclined portion. The rotating plate 42 is provided with a through hole, through which the stream in the inner cylinder 1 flows out sequentially. With this structure, the rotating plate 42 is limited by the annular side plate, which can prevent the rotating plate 42 from leaving the receiving cavity. By disposing of the second sliding groove on the inclined portion, the second sliding groove can guide the movement direction of the second protrusion in the blade 43, ensuring that multiple blades 43 can open and close.

[0049] In some embodiments of this application, a through hole is provided on the annular side plate, and a screw hole is provided at the bottom of the inner cylinder 1. A long hexagonal screw passes through the through hole and is connected to the screw hole, so that the iris mechanism 4 can be fixed to the bottom of the inner cylinder 1.

[0050] In some embodiments of this application, the iris mechanism 4 further includes a lever 41. The outer cylinder 2 has a first guide hole, and the annular side plate has a second guide hole. The lever 41 passes through the first and second guide holes and connects to the rotating plate 42. The first guide hole is an elongated hole extending circumferentially along the outer cylinder 2, and the second guide hole is an elongated hole extending circumferentially along the annular side plate. The first and second guide holes are parallel. With this structure, the lever 41 can rotate the rotating plate 42, making the operation of the Faraday cylinder measuring device simpler and more convenient. Guiding the lever 41 through the first and second guide holes avoids mutual restriction between the lever 41 and the outer cylinder 2 or the annular side plate, thus preventing the lever 41 from rotating normally.

[0051] In some embodiments of this application, the lever 41 is made of insulating material.

[0052] In some embodiments of this application, the Faraday cylinder measuring device further includes a motor drive mechanism, which is connected to the lever 41. The motor drive mechanism can precisely control the rotation angle of the lever 41, thereby precisely controlling the rotation angle of the rotating plate 42, and thus precisely controlling the size of the perforation diameter.

[0053] In some embodiments of this application, the rotating plate 42 is provided with a slot, which includes a first opening facing the base plate and a second opening facing the annular side plate. One end of the lever 41 is engaged in the slot. One of the slot and the lever 41 is provided with a positioning protrusion, and the other is provided with a positioning groove, which engage with each other. This structure makes it easier and more stable to install and connect the lever 41 and the rotating plate 42.

[0054] In some embodiments of this application, the positioning groove is provided with an internal thread, and the positioning protrusion is provided with a through hole. The bolt passes through the through hole and is connected to the internal thread in the positioning groove, so as to lock the lever 41 onto the rotating plate 42.

[0055] In some embodiments of this application, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the Faraday cylinder measuring device also includes a negative electrode ring 45, which, along with the iris mechanism 4, is connected to both ends of the inner cylinder 1. This structure, by applying a negative voltage through the negative electrode ring 45, can suppress secondary electrons from escaping the inner cylinder 1, thus making the beam measurement more accurate.

[0056] In some embodiments of this application, the negative electrode ring 45 is made of oxygen-free copper, and the axis of the negative electrode ring 45 and the axis of the inner cylinder 1 are on the same straight line.

[0057] In some embodiments of this application, the Faraday cylinder measuring device further includes a first insulating ring 6, which is fixedly connected to the end of the inner cylinder 1, and a negative electrode ring 45 is fixedly connected to the first insulating ring 6. With this structure, the negative electrode ring 45 is supported by the first insulating ring 6, allowing the negative electrode ring 45 to be installed at one end of the inner cylinder 1, and ensuring that the negative electrode ring 45 and the inner cylinder 1 are in an insulated state, thus preventing electrical connection between the negative electrode ring 45 and the inner cylinder 1 from affecting measurement accuracy.

[0058] In some embodiments of this application, the axes of the first insulating ring 6, the negative electrode ring 45, and the inner cylinder 1 are located on the same straight line.

[0059] In some embodiments of this application, the first insulating ring 6 is fixedly connected to one end face of the inner cylinder 1 along its axial direction, and three mounting bosses are provided on the other end face of the first insulating ring 6 along its axial direction. The three mounting bosses are evenly distributed around the circumference of the first insulating ring 6, and the negative electrode ring 45 is mounted on the mounting bosses. This structure improves the stability of the negative electrode ring 45's installation by mounting it on the mounting bosses, and also makes installation more convenient. Furthermore, the mounting bosses increase the distance between the inner cylinder 1 and the negative electrode ring 45, thereby improving the insulation performance between them.

[0060] In some embodiments of this application, the first insulating ring 6 is provided with three through holes, and one end of the inner cylinder 1 is provided with a screw hole. The screw passes through the through hole and is connected to the screw hole on the inner cylinder 1, so that the first insulating ring 6 can be fixed on the inner cylinder 1. The three through holes and three mounting bosses are distributed alternately, and a mounting boss is provided between any two adjacent through holes. In this way, the stability of the connection between the inner cylinder 1 and the negative electrode ring 45 can be improved.

[0061] In some embodiments of this application, such as Figure 1 , Figure 6 and Figure 7 As shown, the insulating connector 3 includes a second insulating ring 31 and a third insulating ring 32, which are arranged sequentially along the axial direction of the inner cylinder 1. The inner ring surfaces of both the second insulating ring 31 and the third insulating ring 32 are fixedly connected to the inner cylinder 1, and the outer ring surfaces of both the second insulating ring 31 and the third insulating ring 32 are fixedly connected to the outer cylinder 2. With this structure, the inner cylinder 1 and the outer cylinder 2 are connected by the second insulating ring 31 and the third insulating ring 32, which improves the stability of the connection between the inner cylinder 1 and the outer cylinder 2.

[0062] In some embodiments of this application, three first connecting bosses and three second connecting bosses are respectively provided on the outer ring surfaces of the second insulating ring 31 and the third insulating ring 32. The three first connecting bosses are evenly distributed along the circumference of the second insulating ring 31, and the three second connecting bosses are evenly distributed along the circumference of the third insulating ring 32. With this structure, the outer cylinder 2 is mounted on the first connecting bosses and the second connecting bosses, which can improve the stability of the connection between the inner cylinder 1 and the outer cylinder 2, and at the same time increase the distance between the inner cylinder 1 and the outer cylinder 2, thereby improving the insulation performance between the inner cylinder 1 and the outer cylinder 2.

[0063] In some embodiments of this application, the second insulating ring 31 has three through holes, and the outer circumferential surface of the inner cylinder 1 has screw holes. Screws pass through the through holes and connect with the screw holes on the outer circumferential surface of the inner cylinder 1, so that the second insulating ring 31 can be fixed to the inner cylinder 1. The three through holes and three first connecting bosses are staggered, with a first connecting boss positioned between any two adjacent through holes. The third insulating ring 32 has three through holes, and the outer circumferential surface of the inner cylinder 1 has screw holes. Screws pass through the through holes and connect with the screw holes on the outer circumferential surface of the inner cylinder 1, so that the third insulating ring 32 can be fixed to the inner cylinder 1. The three through holes and three second connecting bosses are staggered, with a second connecting boss positioned between any two adjacent through holes.

[0064] In some embodiments of this application, to ensure the accuracy of beam current measurement during the experiment, the Faraday cylinder measuring device is installed close to the target material. The negative electrode ring is connected to a negative voltage of tens to hundreds of volts depending on the energy of the incident ion beam. The outer cylinder is grounded, and the inner cylinder is connected to an ammeter to measure the beam current intensity. The steps for real-time measurement of the beam current intensity during the experiment are as follows:

[0065] First, the rotating plate rotates in the forward direction to control multiple blades to be in a closed state, so that the perforation formed by the multiple blades is tightly closed.

[0066] Secondly, the rotating plate is controlled to rotate in the opposite direction. The rotation of the rotating plate drives multiple blades to open gradually. When the beam current intensity on the ammeter is very small or zero, the area of ​​the perforation at this time is recorded as S.

[0067] Then, the rotating plate is controlled to rotate in the forward direction. The rotation of the rotating plate drives multiple blades to gradually close, so that the area of ​​the perforation is the preset area size. The area of ​​the perforation at this time is recorded as S1, and the beam current intensity on the ammeter is recorded as Q1.

[0068] Finally, the beam intensity of the beam flowing out of the perforation interacting with the target material is calculated according to the first calculation formula: Q=Q1*S1 / (S-S1), where Q is the beam intensity.

[0069] In the description of this utility model, it should be understood that the terms "center", "circumferential", "axial", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0070] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A Faraday cylinder measuring device for measuring beam intensity, characterized in that, include: An inner cylinder for collecting charged particles, wherein the inner cylinder is open at both ends; The outer cylinder is fitted over the inner cylinder to shield the inner cylinder from interference from external electromagnetic fields. An insulating connector is disposed between the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder are connected by the insulating connector; An iris recognition mechanism includes a fixed plate, a rotating plate, and multiple blades. The fixed plate is fixedly connected to the end of the inner cylinder. The rotating plate rotates relative to the fixed plate. The blades are disposed between the fixed plate and the rotating plate. The rotating plate has a first sliding groove, and the fixed plate has a second sliding groove. The two sides of the blades have a first protrusion and a second protrusion, respectively. The first protrusion is engaged in the first sliding groove, and the second protrusion is engaged in the second sliding groove. The multiple blades are arranged sequentially along the circumference of the inner cylinder, and a perforation is formed between the multiple blades. The beam in the inner cylinder flows out through the perforation. When the rotating plate rotates, it drives the blades to rotate and slide along the first and second sliding grooves, so that the multiple blades can open or close to adjust the size of the perforation.

2. The Faraday cylinder measuring device for measuring beam intensity according to claim 1, characterized in that, The first groove is a hexagonal annular groove, which includes six rectangular grooves. The first protrusion is a rectangular protrusion. The blade has six protrusions, and the first protrusions of the six blades are respectively engaged in the six rectangular grooves. The second slide groove is provided with six, and the second protrusion is a cylindrical protrusion. The second protrusions of the six blades are respectively engaged in the six second slide grooves.

3. The Faraday cylinder measuring device for measuring beam intensity according to claim 2, characterized in that, The fixed plate includes a base plate and an annular side plate, the base plate and the annular side plate together form a receiving cavity, and the rotating plate is disposed in the receiving cavity and rotates relative to the annular side plate; The base plate includes an annular portion and six inclined portions. The axis of the annular portion and the axis of the inner cylinder are on the same straight line. The six inclined portions are arranged sequentially along the circumference of the annular portion. One end of each inclined portion is connected to the annular portion, and the other end is connected to the annular side plate. The second slide groove is provided on the inclined portion. The inclined portion is radially inclined relative to the annular portion. The length direction of the second slide groove is the same as the length direction of the inclined portion. The rotating plate is provided with a through hole, and the beam in the inner cylinder flows out through the through hole, the perforation and the central hole of the annular part in sequence.

4. The Faraday cylinder measuring device for measuring beam intensity according to claim 3, characterized in that, The iris mechanism also includes a lever. The outer cylinder is provided with a first guide hole, and the annular side plate is provided with a second guide hole. The lever passes through the first guide hole and the second guide hole and is connected to the rotating plate. The first guide hole is an elongated hole extending circumferentially along the outer cylinder, and the second guide hole is an elongated hole extending circumferentially along the annular side plate. The first guide hole and the second guide hole are parallel.

5. The Faraday cylinder measuring device for measuring beam intensity according to claim 4, characterized in that, The rotating plate is provided with a slot, the slot including a first opening facing the base plate and a second opening facing the annular side plate, and one end of the lever is engaged in the slot; One of the slot and the lever has a positioning protrusion, and the other has a positioning groove, with the positioning protrusion and the positioning groove engaging in a locking fit.

6. The Faraday cylinder measuring device for measuring beam intensity according to claim 1, characterized in that, It also includes a negative electrode ring, which and the iris mechanism are respectively connected to the two ends of the inner cylinder.

7. The Faraday cylinder measuring device for measuring beam intensity according to claim 6, characterized in that, It also includes a first insulating ring, which is fixedly connected to the end of the inner cylinder, and the negative electrode ring is fixedly connected to the first insulating ring.

8. The Faraday cylinder measuring device for measuring beam intensity according to claim 7, characterized in that, The first insulating ring is fixedly connected to the end face of the inner cylinder on one side along its axial direction. The first insulating ring is provided with three mounting bosses on the other side along its axial direction. The three mounting bosses are evenly distributed around the circumference of the first insulating ring. The negative electrode ring is mounted on the mounting bosses.

9. The Faraday cylinder measuring device for measuring beam intensity according to claim 1, characterized in that, The insulating connector includes a second insulating ring and a third insulating ring, which are arranged sequentially along the axial direction of the inner cylinder. The inner ring surfaces of the second insulating ring and the third insulating ring are fixedly connected to the inner cylinder, and the outer ring surfaces of the second insulating ring and the third insulating ring are fixedly connected to the outer cylinder.

10. The Faraday cylinder measuring device for measuring beam intensity according to claim 9, characterized in that, The outer ring surfaces of the second insulating ring and the third insulating ring are respectively provided with three first connecting bosses and three second connecting bosses. The three first connecting bosses are evenly distributed along the circumference of the second insulating ring, and the three second connecting bosses are evenly distributed along the circumference of the third insulating ring.

Images