Faraday cup receiver and method of receiving

Abstract

The application belongs to the technical field of isotope mass spectrometer, and particularly relates to a Faraday cup receiver and a receiving method thereof, which comprises a shielding shell assembly, a suppressor assembly, a cup body assembly and a plurality of mounting screws; the suppressor assembly and the cup body assembly are fixedly installed in the shielding shell assembly. The Faraday cup receiver with the shielding shell and the suppressor is simple to process, easy to ensure assembly precision, can effectively shield the interference of stray ions and the escape of secondary electrons, and can be used as a detector of a multi-receiving isotope mass spectrometer.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of isotope mass spectrometer, and particularly relates to a Faraday cup receiver and a receiving method thereof. BACKGROUND

[0002] The Faraday cup receiver is an important sensor of the mass spectrometer, which converts the ion flow moving in the vacuum into the electron flow in the conductor, and then realizes the measurement of the ion flow intensity. The multi-receiving isotope mass spectrometer measures the intensity of multiple ion flows at the same time by using the parallel arranged receivers, and then realizes the determination of the isotope ratio. When measuring the isotope of the element with high mass number, the spacing between the receivers is small, and therefore the overall width of the receiver of the multi-receiving isotope mass spectrometer is relatively narrow, generally less than 2.5mm. The multi-receiving isotope mass spectrometer uses the signal ratio between the receivers as the final measurement result, and the consistency of the receiving efficiency is directly related to the measurement accuracy.

[0003] However, the receiving efficiency of the Faraday cup receiver of the multi-receiving isotope mass spectrometer is often affected by the charge interference, the leakage current and the secondary electron escape, and therefore the difference is caused. Therefore, it is necessary to design the Faraday cup receiver based on the metal material, and provided with the shielding shell, the suppression electrode, the cup body and the insulating ceramic, and the receiving method thereof, so as to realize the effects of high consistency of the receiving efficiency, small overall width, easy processing and assembly. SUMMARY

[0004] The application aims to provide a Faraday cup receiver and a receiving method thereof, which are used to solve the technical problems of the poor shielding effect of the Faraday cup receiver, the poor secondary electron escape effect and the difficult guarantee of the consistency of the receiving efficiency.

[0005] The technical scheme of the application is as follows:

[0006] A Faraday cup receiver comprises a shielding shell assembly 10, a suppression electrode assembly 20, a cup body assembly 30 and a plurality of mounting screws, and the suppression electrode assembly 20 and the cup body assembly 30 are fixed inside the shielding shell assembly 10.

[0007] The shielding shell assembly 10 comprises a shielding shell skeleton 11, a fixed shielding plate 12, a limiting slit 13, a shielding shell inlet 14, a detachable shielding plate 15, a plurality of nuts 16 and a lead fixing groove 17, the fixed shielding plate 12 is welded on the lower surface of the shielding shell skeleton 11, the shielding shell skeleton 11 is in the overall "C" shape structure, the opening end of the shielding shell skeleton 11 is provided with the shielding shell inlet 14, the inner surface of the shielding shell skeleton 11 is provided with the limiting slit 13 near the opening end, the other end of the shielding shell skeleton 11 is threadedly connected with the lead fixing groove 17, and the detachable shielding plate 15 is threadedly connected on the upper surface of the shielding shell skeleton 11 through the plurality of nuts 16.

[0008] The upper surface of the shielding shell skeleton 11 is also symmetrically provided with a plurality of screw holes 111 for mounting the removable shielding plate; the side surface of the shielding shell skeleton 11 is also provided with a suppression pole lead hole 112 and a threaded hole 114 for fixing the receiver; the inner side surface of the shielding shell skeleton 11 is respectively provided with a suppression pole assembly mounting slot 113 and a cup body assembly mounting slot 117;

[0009] The side surface of the shielding shell skeleton 11 on which the lead fixing groove 17 is screwed is also respectively provided with a signal line via hole 115 and a wire pressing threaded hole 116;

[0010] The suppression pole assembly 20 is arranged in the suppression pole assembly mounting slot 113 of the shielding shell assembly 10; the cup body assembly 30 is arranged in the cup body assembly mounting slot 117 of the shielding shell assembly 10.

[0011] The suppression pole assembly mounting slot 113 is also provided with a limiting slit 13; the limiting slit 13 is a rectangular plate structure as a whole, and the two ends of the limiting slit 13 are respectively provided with a folded edge 131; the middle part of the limiting slit 13 is provided with a limiting slit 132; the shielding shell inlet 14 is a plate structure as a whole, and the shielding shell inlet 14 comprises a positioning protrusion 141 and an inlet slit 142; the positioning protrusion 141 is arranged at the two ends of the shielding shell inlet 14; the middle part of the shielding shell inlet 14 is provided with an inlet slit 142; the width of the limiting slit 132 is smaller than the width of the inlet slit 142.

[0012] The fixed shielding plate 12 is a rectangular plate structure as a whole, and one short edge of the fixed shielding plate 12 is bent to form a folded baffle 121; the folded baffle 121 is provided with a shielding shell inlet positioning hole 122 at the bending position; the surface of the fixed shielding plate 12 is also uniformly provided with a plurality of screw holes 123.

[0013] The removable shielding plate 15 is a rectangular plate structure as a whole, and one short edge of the removable shielding plate 15 is bent to form a folded baffle 151; the folded baffle 151 is provided with a shielding shell inlet positioning hole 152 at the bending position; the surface of the removable shielding plate 15 is also uniformly provided with a plurality of nut positioning holes 153.

[0014] The nut 16 is a cylindrical structure as a whole, and the center of the nut 16 is provided with a threaded hole 161; each nut positioning hole 153 of the removable shielding plate 15 is provided with a nut 16; the cylindrical outer surface of the nut 16 and the inner surface of the nut positioning hole 153 are welded and fixed.

[0015] The lead fixing groove 17 is also provided with a screw hole 171.

[0016] The suppressor assembly 20 comprises a precision electrode 21, two positioning ceramic blocks 22, a suppressor lead 24 and a ceramic tube 23, the positioning ceramic blocks 22 are fixedly arranged at both ends of the precision electrode 21, and the ceramic tube 23 is connected to the positioning ceramic block 22 at one end of the precision electrode 21; one end of the suppressor lead 24 is welded to the precision electrode 21, and the other end of the suppressor lead 24 penetrates out of the positioning ceramic block 22 and the ceramic tube 23.

[0017] The cup assembly 30 comprises a cup skeleton 31, a cup baffle 32 and a plurality of positioning pins 33, the cup skeleton 31 is inserted and connected with the cup baffle 32, and the cup skeleton 31 and the cup baffle 32 are fixedly connected by welding; the positioning pins 33 are arranged on the side surface of the cup skeleton 31; the positioning pins 33 are inserted into the positioning ceramic blocks 22.

[0018] The cup skeleton 31 is in a "C" shape structure; the cup skeleton 31 is provided with a gas guide hole 312 on the upper surface of the bottom edge; the inner surface of the bottom edge of the cup skeleton 31 has an inclined angle, which is used for suppressing the secondary electron rebound; the inclined angle is greater than 5°; a plurality of positioning holes 311 are formed in the side surface of the cup skeleton 31; the cup baffle 32 is in a "U" shape plate structure, and the cup inlet 321 is formed in the curved portion of the cup baffle 32;

[0019] A receiving method of the Faraday cup receiver according to any one of the above, comprising the following steps:

[0020] Step one: the cup inlet of the cup assembly is sequentially arranged corresponding to the suppressor assembly, the limiting slit and the shielding shell inlet, and forms a channel for the ion beam to enter the receiver;

[0021] Step two: a stop electric field is formed between the suppressor assembly and the cup assembly by introducing a negative voltage, so as to suppress the escape of secondary electrons;

[0022] The ceramic positioning blocks in the suppressor assembly ensure the mutual insulation and accurate positioning among the suppressor, the shielding shell and the cup; the ion beam sequentially passes through the shielding shell inlet, the limiting slit and the rectangular slot in the middle of the suppressor, and finally enters the cup assembly;

[0023] Step three: the secondary electrons generated after the ion beam hits the cup assembly fly in the cup assembly, and at the same time, the electron current is generated in the conductor to neutralize the ion charge and the secondary electron charge;

[0024] The signal line connected to the cup assembly sends the current signal to the amplifier;

[0025] Step four: the inclined surface of the bottom edge of the cup skeleton and the stop electric field can effectively suppress the escape of secondary electrons from the cup assembly, thereby improving the receiving efficiency of the Faraday cup receiver.

[0026] The application has the beneficial technical effects:

[0027] The application has the following technical advantages:

[0028] (1) The cup body surrounding plate of the device adopts a sheet metal bending process, and the number of parts is small and the assembly precision is high.

[0029] (2) The bottom of the cup body framework in the device adopts an inclined surface structure, which effectively suppresses the direct flight of secondary electrons to the entrance slit, thereby improving the receiving efficiency.

[0030] (3) The limiting slit of the device and the suppression pole between the cup body assembly are connected to a low potential, and an ideal blocking electric field is formed between the cup body, effectively suppressing the escape of secondary electrons.

[0031] (4) The ceramic positioning block effectively ensures the mutual insulation between the suppression pole, the shielding shell and the cup body, and suppresses the influence of leakage current on the measurement accuracy.

[0032] (5) The shielding shell framework and the fixed shielding plate are welded to form a mounting base, which effectively ensures the positioning accuracy of the shielding shell entrance, the limiting slit, the suppression pole assembly and the cup body.

[0033] In summary, the Faraday cup receiver designed by the application is a Faraday cup receiver with a shielding shell and a suppression pole, which is simple to process and easy to ensure assembly precision, can effectively shield stray ion interference and secondary electron escape, and can be used as a detector for a multi-receiving isotope mass spectrometer. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The Faraday cup receiver assembly structure described in the application

[0035] Figure 2 The shielding shell assembly structure described in the application

[0036] Figure 3 The shielding shell framework structure described in the application

[0037] Figure 4 The fixed shielding plate structure described in the application

[0038] Figure 5 The limiting slit structure described in the application

[0039] Figure 6 The shielding shell entrance structure described in the application

[0040] Figure 7 The detachable shielding plate structure described in the application

[0041] Figure 8 The nut structure described in the application

[0042] Figure 9 Structure diagram of lead fixing groove for the application

[0043] Figure 10 Structure diagram of suppressor electrode assembly for the application

[0044] Figure 11 Structure diagram of cup assembly for the application

[0045] Figure 12 Structure diagram of cup skeleton for the application

[0046] Figure 13 Structure diagram of cup surrounding plate for the application

[0047] Wherein: 10 - shielding shell assembly; 20 - suppressor electrode assembly; 30 - cup assembly;

[0048] 11 - shielding shell skeleton; 12 - fixed shielding plate; 13 - limiting slit; 14 - shielding shell entrance; 15 - removable shielding plate; 16 - nut; 17 - lead fixing groove, 111 - screw hole; 112 - suppressor electrode lead hole; 113 - suppressor electrode assembly mounting groove; 114 - threaded hole; 115 - signal line via hole; 116 - wire pressing threaded hole; 117 - cup assembly mounting groove, 121 - folding baffle; 122 - entrance positioning square hole; 123 - screw hole, 131 - folded edge; 132 - limiting slit, 141 - positioning protrusion; 142 - entrance slit, 151 - folding baffle; 152 - entrance positioning hole; 153 - nut positioning hole, 161 - threaded through hole, 171 - screw hole;

[0049] 21 - precision electrode; 22 - positioning ceramic block; 23 - ceramic tube; 24 - suppressor electrode lead wire;

[0050] 31 - cup skeleton; 32 - cup surrounding plate; 33 - positioning pin, 311 - positioning hole; 312 - air guide hole; 313 - inclined surface, 321 - cup entrance. DETAILED DESCRIPTION

[0051] The content of the application will be further described below in combination with the drawings and specific embodiments,

[0052] As Figures 1 to 6 shown, a Faraday cup receiver includes a shielding shell assembly 10, a suppressor electrode assembly 20, a cup assembly 30, and a plurality of mounting screws; the opening of the middle rectangular groove of the precision electrode 21 on the suppressor electrode assembly 20 and the opening of the cup entrance 321 on the cup assembly 30 are oppositely arranged, and the suppressor electrode assembly 20 and the cup assembly 30 are fixed inside the shielding shell assembly 10.

[0053] The shielding shell assembly 10 comprises a shielding shell skeleton 11, a fixed shielding plate 12, a limiting slit 13, a shielding shell entrance 14, a detachable shielding plate 15, a plurality of nuts 16 and a lead fixing groove 17, the fixed shielding plate 12 is welded on the lower surface of the shielding shell skeleton 11; the shielding shell skeleton 11 is in the overall "C" shape structure, the opening end of the shielding shell skeleton 11 is provided with the shielding shell entrance 14; the inner surface of the shielding shell skeleton 11 is provided with the limiting slit 13 near the opening end; the other end of the shielding shell skeleton 11 is threadedly connected with the lead fixing groove 17; the detachable shielding plate 15 is threadedly connected on the upper surface of the shielding shell skeleton 11 through the plurality of nuts 16.

[0054] The shielding shell assembly 10 can effectively prevent stray ions from shooting at the outer wall of the cup body assembly 30; inhibit the formation of an inhibition electric field between the pole assembly 20 and the cup body assembly 30, and prevent secondary electrons from escaping; the cup body assembly 30 converts ion flow signals into electron flow signals, and transmits the signals to an amplifier through a lead.

[0055] The upper surface of the shielding shell skeleton 11 is also symmetrically provided with a plurality of screw holes 111 for mounting the detachable shielding plate; the side surface of the shielding shell skeleton 11 is also provided with an inhibition pole lead hole 112 and a threaded hole 114 for fixing a receiver; the inner side surface of the shielding shell skeleton 11 is respectively provided with an inhibition pole assembly mounting groove 113 and a cup body assembly mounting groove 117;

[0056] The side surface of the shielding shell skeleton 11 on which the lead fixing groove 17 is screwed is also respectively provided with a signal line via hole 115 and a wire pressing threaded hole 116;

[0057] The detachable shielding plate 15 is also provided with a folding baffle 151, a shielding shell entrance positioning hole 152 and a nut positioning hole 153.

[0058] The inhibition pole assembly 20 is arranged in the inhibition pole assembly mounting groove 113 of the shielding shell assembly 10; the cup body assembly 30 is arranged in the cup body assembly mounting groove 117 of the shielding shell assembly 10.

[0059] The inhibition pole assembly mounting groove 113 is also provided with the limiting slit 13; the limiting slit 13 is in the overall rectangular plate structure, the two ends of the limiting slit 13 are respectively provided with a folding edge 131, and the middle part of the limiting slit 13 is provided with a limiting slit 132; the shielding shell entrance 14 is in the overall plate structure, and comprises a positioning protrusion 141 and an entrance slit 142; the positioning protrusion 141 is arranged at the two ends of the shielding shell entrance 14; the middle part of the shielding shell entrance 14 is provided with the entrance slit 142; the width of the limiting slit 132 is smaller than the width of the entrance slit 142.

[0060] The fixed shielding plate 12 is in the shape of a rectangular plate, and a folding baffle 121 is formed on one of the short sides of the fixed shielding plate 12 by bending. A shielding shell entrance positioning hole 122 is formed at the bending position of the folding baffle 121. A plurality of screw holes 123 are uniformly formed on the surface of the fixed shielding plate 12.

[0061] The detachable shielding plate 15 is in the shape of a rectangular plate, and a folding baffle 151 is formed on one of the short sides of the detachable shielding plate 15 by bending. A shielding shell entrance positioning hole 152 is formed at the bending position of the folding baffle 151. A plurality of nut positioning holes 153 are uniformly formed on the surface of the detachable shielding plate 15.

[0062] The nut 16 is in the shape of a cylinder, and a threaded hole 161 is formed at the center of the nut 16. One nut 16 is arranged in each nut positioning hole 153 of the detachable shielding plate 15. The cylindrical outer surface of the nut 16 and the inner surface of the nut positioning hole 153 are welded and fixed.

[0063] The lead fixing groove 17 is also provided with a screw hole 171.

[0064] The suppressor assembly 20 comprises a precision electrode 21, two positioning ceramic blocks 22, a suppressor lead 24, and a ceramic tube 23. The precision electrode 21 is fixedly provided with the positioning ceramic blocks 22 at both ends. The ceramic tube 23 is connected to the positioning ceramic block 22 at one end of the precision electrode 21. One end of the suppressor lead 24 is welded to the precision electrode 21, and the other end of the suppressor lead 24 passes through the positioning ceramic block 22 and the ceramic tube 23.

[0065] The precision electrode 21 is made of a conductor material, and is also provided with upper and lower symmetrical electrode pieces. The electrode pieces are low-potential electrodes for blocking electric fields. The end of the electrode piece is in contact with the positioning groove of the positioning ceramic block 22 to limit the freedom degree of the precision electrode 21 in the front-rear direction. The precision electrode 21 is provided with a positioning plate at the end, which cooperates with the positioning hole of the positioning ceramic block 22 to limit the freedom degree of the precision electrode 21 in the vertical direction. The middle of the precision electrode 21 is provided with a rectangular groove as an ion beam channel. The removed material of the rectangular groove is folded outward to form a spring piece at both ends of the precision electrode 21 to assist the positioning and clamping of the electrode piece in the positioning groove of the positioning ceramic block 22.

[0066] The middle of the positioning ceramic block 22 is provided with a transverse positioning hole, which cooperates with the positioning plate at both ends of the precision electrode 21. The side of the positioning ceramic block is provided with a vertical positioning groove, which is in contact with the electrode piece and the spring piece at both ends of the precision electrode 21.

[0067] The ceramic tube 23 is also provided with an axial through hole, which is used as an insulating through hole for the lead 24.

[0068] The end of the wire 24 is pressed to form a small flat surface to facilitate welding with the positioning plate of the precision electrode 21, and to supply power to the precision electrode 21; the right-angle bent section of the wire 24 is used to limit the axial movement of the ceramic tube 23, and to ensure reliable insulation.

[0069] The cup assembly 30 comprises a cup skeleton 31, a cup surrounding plate 32 and a plurality of positioning pins 33; the cup skeleton 31 and the cup surrounding plate 32 are connected by insertion and are fixed by welding, forming a box structure with an inlet; the side surface of the cup skeleton 31 is provided with the positioning pins 33; the positioning pins 33 are inserted into the interior of the positioning ceramic block 22.

[0070] The cup skeleton 31 is in a "C" shape structure; the bottom surface of the cup skeleton 31 is provided with a gas guide hole 312; the inner surface of the bottom of the cup skeleton 31 has an inclined angle, which is used to suppress the secondary electron bounce; the inclined angle is generally greater than 5°; a plurality of positioning holes 311 are formed in the side surface of the cup skeleton 31; the cup surrounding plate 32 is in a "U" shape plate structure; the curved part of the cup surrounding plate 32 is provided with a cup inlet 321.

[0071] A receiving method of the Faraday cup receiver, comprising the following steps:

[0072] Step one: the cup inlet of the cup assembly is sequentially provided with the suppression electrode assembly, the limiting slit and the shielding shell inlet, and forms a channel for the ion beam to enter the receiver;

[0073] Step two: a stop electric field is formed between the suppression electrode assembly and the cup assembly by introducing a negative voltage, and the secondary electron escape is suppressed;

[0074] The ceramic positioning block in the suppression electrode assembly ensures the mutual insulation and accurate positioning among the suppression electrode, the shielding shell and the cup; the ion beam sequentially passes through the shielding shell inlet, the limiting slit and the rectangular slot in the middle of the suppression electrode, and finally enters the cup assembly;

[0075] Step three: the secondary electrons generated after the ion hits the cup assembly fly in the cup assembly, and the electron current is generated in the conductor to neutralize the ion charge and the secondary electron charge; the signal line connected with the cup assembly sends the current signal to the amplifier;

[0076] Step four: the inclined surface of the bottom of the cup skeleton and the stop electric field can effectively suppress the secondary electron escape from the cup assembly, and thus improve the receiving efficiency of the Faraday cup receiver.

[0077] The ceramic positioning block is made of insulating material, which suppresses the influence of the leakage current on the measurement accuracy. The cup assembly is externally provided with a metal shielding shell to eliminate the interference of stray ions.

Claims

1. A Faraday cup receiver, characterized in that: include: A shielding shell assembly (10), a suppressor assembly (20), a cup assembly (30) and a plurality of mounting screws; the suppressor assembly (20) and the cup assembly (30) are fixed inside the shielding shell assembly (10); The shielding shell assembly (10) comprises: a shielding shell frame (11), a fixed shielding plate (12), a limiting slit (13), a shielding shell inlet (14), a detachable shielding plate (15), a plurality of nuts (16) and a lead fixing groove (17), wherein the fixed shielding plate (12) is welded to the lower surface of the shielding shell frame (11); the shielding shell frame (11) is a "C"-shaped structure as a whole, and the shielding shell inlet (14) is provided at the open end of the shielding shell frame (11); the limiting slit (13) is provided near the open end of the inner surface of the shielding shell frame (11); the other end of the shielding shell frame (11) is threadedly connected to the lead fixing groove (17); the detachable shielding plate (15) is threadedly connected to the upper surface of the shielding shell frame (11) through a plurality of nuts (16); The upper surface of the shielding shell frame (11) is symmetrically provided with a plurality of screw holes (111) for mounting a detachable shielding plate; the side surface of the shielding shell frame (11) is also provided with a suppressor lead hole (112) and a threaded hole (114) for fixing a receiver; and the inner side surface of the shielding shell frame (11) is respectively provided with a suppressor assembly mounting groove (113) and a cup assembly mounting groove (117); The side surfaces of the threaded lead fixing groove (17) on the shielding shell frame (11) are also provided with a signal line through hole (115) and a wire pressing thread hole (116); The suppressor assembly (20) is arranged in the suppressor assembly mounting groove (113) of the shielding shell assembly (10); the cup assembly (30) is arranged in the cup assembly mounting groove (117) of the shielding shell assembly (10); The suppressor assembly (20) includes: a precision electrode (21), two positioning ceramic blocks (22), a suppressor wire (24) and a ceramic tube (23), wherein the positioning ceramic blocks (22) are fixedly provided at both ends of the precision electrode (21), and the positioning ceramic block (22) at one end of the precision electrode (21) is connected to the ceramic tube (23); one end of the suppressor wire (24) is welded to the precision electrode (21), and the other end of the suppressor wire (24) passes through the positioning ceramic block (22) and the ceramic tube (23); The cup body assembly (30) comprises: a cup body frame (31), a cup body panel (32) and a plurality of positioning pins (33); the cup body frame (31) and the cup body panel (32) are fitted and plugged together and sealed and fixed by welding; positioning pins (33) are provided on the side of the cup body frame (31); the positioning pins (33) are inserted into the interior of the positioning ceramic block (22) for positioning connection; The cup body frame (31) is a "C"-shaped structure as a whole; an air guide hole (312) is provided on the upper surface of the bottom edge of the cup body frame (31); the inner surface of the bottom edge of the cup body frame (31) has an inclined angle for suppressing secondary electron rebound; the inclined angle is greater than 5°; a plurality of positioning holes (311) are also provided on the side of the cup body frame (31); the cup body enclosure (32) is a "U"-shaped plate structure as a whole, and a cup body inlet (321) is also provided on the curved portion of the cup body enclosure (32).

2. A Faraday cup receiver according to claim 1, characterized in that: A limiting slit (13) is further provided in the suppressor assembly mounting groove (113); the limiting slit (13) is a rectangular plate-shaped structure as a whole, and folded edges (131) are respectively provided at both ends of the limiting slit (13), and a limiting slit (132) is provided in the middle of the limiting slit (13); the shielding shell inlet (14) is a plate-shaped structure as a whole, and the shielding shell inlet (14) includes: positioning protrusions (141) and an entrance slit (142); the positioning protrusions (141) are provided at both ends of the shielding shell inlet (14); an entrance slit (142) is provided in the middle of the shielding shell inlet (14); the width of the limiting slit (132) is smaller than the width of the entrance slit (142).

3. A Faraday cup receiver according to claim 2, characterized in that: The fixed shielding plate (12) is a rectangular plate-shaped structure as a whole. A short side of the fixed shielding plate (12) is bent to form a folding baffle (121). A shielding shell entrance positioning hole (122) is provided at the bent position of the folding baffle (121). A plurality of screw holes (123) are also evenly provided on the surface of the fixed shielding plate (12).

4. A Faraday cup receiver according to claim 3, characterized in that: The detachable shielding plate (15) is a rectangular plate-shaped structure as a whole. A short side of the detachable shielding plate (15) is bent to form a folding baffle (151). A shielding shell entrance positioning hole (152) is provided at the bent position of the folding baffle (151). A plurality of nut positioning holes (153) are also evenly provided on the surface of the detachable shielding plate (15).

5. A Faraday cup receiver according to claim 4, characterized in that: The nut (16) is a cylindrical structure as a whole, and a threaded through hole (161) is opened at the center of the nut (16). A nut (16) is arranged in each nut positioning hole (153) on the detachable shielding plate (15); the outer surface of the cylinder arranged on the nut (16) and the inner surface of the nut positioning hole (153) are welded and fixed.

6. A Faraday cup receiver according to claim 5, characterized in that: The lead wire fixing groove (17) is also provided with a screw hole (171).

7. A receiving method of a Faraday cup receiver according to any one of claims 1 to 6, characterized in that The steps include: Step 1: The front of the cup inlet of the cup assembly is sequentially arranged corresponding to the suppressor assembly, the limiting slit, and the shielding shell inlet, forming a channel for the ion beam to enter the receiver; Step 2: By introducing a negative voltage, a blocking electric field is formed between the suppressor assembly and the cup assembly to inhibit the escape of secondary electrons; The ceramic positioning blocks in the suppressor assembly ensure mutual insulation and accurate positioning between the suppressor assembly, the shielding shell assembly, and the cup assembly. The ion beam passes through the shielding shell entrance, the limiting slit, the rectangular slot in the middle of the precision electrode, and finally enters the cup assembly. Step 3: Secondary electrons generated by ion impacting the cup assembly fly within the cup assembly, generating an electron flow within the conductor to neutralize the ion charge and the secondary electron charge. The signal line connected to the cup assembly sends the current signal to the amplifier. Step 4: The inclined surface at the bottom edge of the cup frame and the blocking electric field can effectively suppress the escape of secondary electrons from the cup assembly, thereby improving the receiving efficiency of the Faraday cup receiver.

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