A suppressor electrode of a Faraday cup receiver and its suppression method

Abstract

The present invention belongs to the technical field of isotope mass spectrometers, and particularly relates to a Faraday cup receiver suppressor electrode and a suppression method thereof, including: a precision electrode, two positioning ceramic blocks, a wire, and a ceramic tube. The positioning ceramic blocks are fixedly arranged at both ends of the precision electrode, and the ceramic tube is connected to the positioning ceramic block at one end of the precision electrode; one end of the wire is welded to the precision electrode, and the other end of the wire passes through the positioning ceramic block and the ceramic tube. The present invention is manufactured by a sheet metal bending process, which is easy to process, has a small number of parts, high precision, and reliable positioning, can form an ideal blocking electric field with the cup body, and effectively suppresses the escape of secondary electrons.

Description

Technical Field

[0001] The present invention belongs to the technical field of isotope mass spectrometers, and particularly relates to a Faraday cup receiver suppressor electrode and a suppression method thereof. Background Art

[0002] A Faraday cup receiver is an important sensor in a mass spectrometer. It converts the ion current moving in a vacuum into an electron current in a conductor, thereby realizing the measurement of the ion current intensity. A multi-receiver isotope mass spectrometer uses the signal ratio between receivers as the final measurement result. The consistency of the Faraday cup reception efficiency is directly related to the measurement accuracy. A suppressor electrode is arranged in front of the receiver opening, and the electric field formed between the suppressor electrode and the receiver opening can prevent secondary electrons from escaping, so that the reception efficiency of the Faraday cup receiver is increased to nearly 100%, and thus higher reception efficiency consistency can be obtained. This is the most effective technical means.

[0003] However, at present, due to space limitations, the overall thickness of the Faraday cup receiver of a multi-receiver isotope mass spectrometer is only about 2.3 mm. As a component in the Faraday cup receiver, the suppressor electrode is very difficult to process and assemble.

[0004] Therefore, it is necessary to design a Faraday cup receiver suppressor electrode and a suppression method thereof, which are easy to process, have a small number of parts, high precision, and reliable positioning, and can form an ideal blocking electric field with the cup body to effectively suppress the escape of secondary electrons. Summary of the Invention

[0005] The purpose of the present invention is to provide a Faraday cup receiver suppressor electrode and a suppression method thereof, which are used to solve the problems of high processing and assembly difficulty and low ion signal accuracy of the existing Faraday cup receiver suppressor electrode.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A Faraday cup receiver suppressor electrode includes: a precision electrode, two positioning ceramic blocks, a wire, and a ceramic tube. The positioning ceramic blocks are fixedly arranged at both ends of the precision electrode, and the ceramic tube is connected to the positioning ceramic block at one end of the precision electrode; one end of the wire is welded to the precision electrode, and the other end of the wire passes through the positioning ceramic block and the ceramic tube.

[0008] The overall structure of the precision electrode is a "C" - shaped groove structure. The precision electrode includes: two pole pieces, two positioning plates, a rectangular through - hole, and two elastic pieces;

[0009] The two pole pieces are symmetrically arranged on the two groove-shaped edges of the precision electrode; a positioning plate is arranged at each end of the precision electrode; a rectangular through-hole is opened in the middle of the groove-shaped bottom surface of the precision electrode; elastic pieces are arranged on the two short sides of the rectangular through-hole; the elastic pieces are formed by symmetrically folding outwards the material in the middle of the groove-shaped bottom surface of the precision electrode after opening the rectangular through-hole.

[0010] The positioning ceramic block includes: a positioning groove and a positioning through-hole; the whole of the positioning ceramic block is in a "concave" shape structure, a positioning groove is opened in the middle of the surface of the positioning ceramic block, and a positioning through-hole is opened at the center of the positioning groove.

[0011] The positioning plate is arranged in the positioning through-hole of the positioning ceramic block for restricting the freedom degree of the precision electrode in the vertical direction; the size of the positioning plate matches the size of the positioning through-hole.

[0012] The pole pieces and the elastic pieces of the precision electrode are both arranged in the positioning groove of the positioning ceramic block for restricting the freedom degree of the precision electrode in the transverse direction, and the elastic pieces are used to assist the positioning and clamping of the pole pieces in the positioning groove.

[0013] The rectangular through-hole is an ion beam channel; the whole wire is in an "L" - shaped bending structure, a plane is arranged at the end of the wire welded to the precision electrode, and the plane is used for welding with the positioning plate of the precision electrode to supply power to the precision electrode; the bending angle of the bending section of the wire is a right angle.

[0014] A through-hole is opened at the center position of the ceramic tube for the wire to pass through insulatedly.

[0015] A suppression method for the suppressor of the Faraday cup receiver suppressor as described above includes the following steps:

[0016] Step 1: Place the Faraday cup receiver suppressor in front of the opening of the Faraday cup receiver, and make the rectangular through-hole in the middle of the precision electrode face the opening of the Faraday cup receiver to form a channel for the ion beam to enter the Faraday cup receiver; accurately position the precision electrode in the positioning hole and the positioning groove of the positioning ceramic block;

[0017] Step 2: The Faraday cup receiver is at ground potential, connect the precision electrode to the negative voltage source through a wire. Since the potential of the precision electrode is lower than that of the Faraday cup receiver, a blocking electric field is formed between the Faraday cup receiver and the precision electrode;

[0018] Step 3: The accurate positioning of the precision electrode and the positioning ceramic block forms a mirror - symmetric ideal blocking electric field; since the positioning ceramic block and the ceramic tube are insulating parts, they can isolate the precision electrode, the wire from the Faraday cup receiver and other conductor components;

[0019] Step 4: When the ion beam flies through the rectangular through-hole in the middle of the precision electrode and enters the Faraday cup receiver, the secondary electrons generated by the impact of the ion beam on the Faraday cup receiver cannot escape from the detector under the action of the blocking electric field, effectively suppressing the escape of secondary electrons, and thus improving the reception efficiency of the Faraday cup receiver.

[0020] Advantageous technical effects of the present invention:

[0021] The suppressor of the Faraday cup receiver designed in the present invention is manufactured by a sheet metal bending process, which is easy to process, has few parts, high precision, and reliable positioning, and can form an ideal blocking electric field with the cup body to effectively suppress the escape of secondary electrons. Description of the drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of the suppressor of the Faraday cup receiver designed in the present invention

[0023] Figure 2 It is a schematic diagram of the structure of the precision electrode described in the present invention;

[0024] Figure 3 It is a schematic diagram of the plane expansion of the precision electrode described in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the positioning ceramic block described in the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the wire described in the present invention

[0027] Figure 6 It is a schematic diagram of the structure of the ceramic tube described in the present invention.

[0028] In the figure: 1 - precision electrode; 2 - positioning ceramic block; 3 - wire; 4 - ceramic tube, 11 - pole piece; 12 - positioning plate; 13 - rectangular through-hole; 14 - elastic piece, 21 - positioning through-hole; 22 - positioning groove, 31 - plane; 32 - bending section, 41 - through-hole. Detailed implementation manners

[0029] The content of the present invention will be further described below in conjunction with the drawings and specific implementation manners.

[0030] As Figures 1 to 6 shown, a suppressor of a Faraday cup receiver includes: a precision electrode 1, two positioning ceramic blocks 2, a wire 3 and a ceramic tube 4. The positioning ceramic blocks 2 are fixedly arranged at both ends of the precision electrode 1, and the ceramic tube 4 is connected to the positioning ceramic block 2 at one end of the precision electrode 1; one end of the wire 3 is welded to the precision electrode 1, and the other end of the wire 3 passes through the positioning ceramic block 2 and the ceramic tube 4.

[0031] The overall precision electrode 1 has a "C"-shaped groove structure, and the precision electrode 1 includes: two pole pieces 11, two positioning plates 12, a rectangular through-hole 13, and two elastic pieces 14;

[0032] The two pole pieces 11 are symmetrically arranged on the two groove-shaped edges of the precision electrode 1 respectively; one positioning plate 12 is arranged at each end of the precision electrode 1; a rectangular through-hole 13 is opened in the middle of the groove-shaped bottom surface of the precision electrode 1; elastic pieces 14 are arranged on the two short sides of the rectangular through-hole 13 respectively; the elastic pieces 14 are formed by symmetrically folding outwards the material in the middle of the groove-shaped bottom surface of the precision electrode 1 after opening the rectangular through-hole 13.

[0033] The positioning ceramic block 2 includes: a positioning groove 22 and a positioning through-hole 21; the overall positioning ceramic block 2 has a "concave" - shaped structure, a positioning groove 22 is opened in the middle of the surface of the positioning ceramic block 2, and a positioning through-hole 21 is opened at the center of the positioning groove 22.

[0034] The positioning plate 12 is arranged in the positioning through-hole 21 of the positioning ceramic block 2 to limit the freedom degree of the precision electrode 1 in the vertical direction; the size of the positioning plate 12 matches the size of the positioning through-hole 21.

[0035] The pole pieces 11 and the elastic pieces 14 of the precision electrode 1 are both arranged in the positioning groove 22 of the positioning ceramic block 2 to limit the freedom degree of the precision electrode 1 in the lateral direction, and the elastic pieces 14 are used to assist the positioning and clamping of the pole pieces 11 in the positioning groove 22.

[0036] The rectangular through-hole 13 is an ion beam channel; the overall wire 3 has an "L"-shaped bent structure, a plane 31 is arranged at the end of the wire 3 welded to the precision electrode 1, and the plane 31 is used to weld with the positioning plate 12 of the precision electrode 1 to supply power to the precision electrode 1; the bending angle of the bent section of the wire 3 is a right angle. The right-angled bent section of the wire 3 is used to limit the axial movement of the ceramic tube 4 to ensure reliable insulation.

[0037] A through-hole 41 is opened at the center position of the ceramic tube 4 for the wire 3 to pass through insulatedly.

[0038] The pole pieces 11, the positioning plates 12, and the elastic pieces 14 are all integrally formed with the precision electrode (1);

[0039] A method for suppressing a suppressor of a Faraday cup receiver as described above includes the following steps:

[0040] Step 1: Place the suppressor of the Faraday cup receiver in front of the opening of the Faraday cup receiver, align the rectangular through-hole in the middle of the precision electrode with the opening of the Faraday cup receiver to form a channel for the ion beam to enter the Faraday cup receiver; accurately position the precision electrode in the positioning holes and positioning grooves of the positioning ceramic block;

[0041] Step 2: The Faraday cup receiver is at ground potential. Connect the precision electrode to the negative voltage source through a wire. Since the potential of the precision electrode is lower than that of the Faraday cup receiver, a blocking electric field is formed between the Faraday cup receiver and the precision electrode.

[0042] Step 3: The accurate positioning of the precision electrode and the positioning ceramic block forms an ideal mirror-symmetric blocking electric field. Since the positioning ceramic block and the ceramic tube are insulating parts, they can isolate the precision electrode, the wire from the Faraday cup receiver and other conductor components.

[0043] Step 4: When the ion beam flies through the rectangular through-hole in the middle of the precision electrode and enters the Faraday cup receiver, the secondary electrons generated by the impact of the ion beam on the Faraday cup receiver cannot escape from the detector under the action of the blocking electric field, effectively suppressing the escape of secondary electrons, and thus improving the reception efficiency of the Faraday cup receiver.

[0044] The precision electrode of the present invention is manufactured by a sheet metal bending process, with fewer parts and no need for assembly and welding.

[0045] An etched indentation is provided at the bent part of the precision electrode designed by the present invention, and high-precision bending does not require complex precision molds.

[0046] The present invention uses the opening structure in the middle of the precision electrode to fold the removed material outwards, and relies on its own elasticity to ensure that the electrode fits the opening of the positioning ceramic block, realizing positioning and clamping in the front-rear direction.

Claims

1. A suppressor of a Faraday cup receiver, characterized in that, Comprising: A precision electrode (1), two positioning ceramic blocks (2), a wire (3) and a ceramic tube (4). The two positioning ceramic blocks (2) are fixedly arranged at both ends of the precision electrode (1). A ceramic tube (4) is connected to the positioning ceramic block (2) at one end of the precision electrode (1). One end of the wire (3) is welded to the precision electrode (1), and the other end of the wire (3) passes through the positioning ceramic block (2) and the ceramic tube (4). The precision electrode (1) is of an overall "C"-shaped groove structure and includes: two pole pieces (11), two positioning plates (12), a rectangular through-hole (13) and two elastic pieces (14). The two pole pieces (11) are symmetrically arranged on the two groove-shaped sides of the precision electrode (1). One positioning plate (12) is arranged at each end of the precision electrode (1). A rectangular through-hole (13) is formed in the middle of the groove-shaped bottom surface of the precision electrode (1). Elastic pieces (14) are arranged on the two short sides of the rectangular through-hole (13). The elastic pieces (14) are formed by symmetrically folding outwards the material in the middle of the groove-shaped bottom surface of the precision electrode (1) after opening the rectangular through-hole (13).

2. The suppressor of a Faraday cup receiver according to claim 1, characterized in that, The positioning ceramic block (2) includes: a positioning groove (22) and a positioning through-hole (21). The positioning ceramic block (2) is of an overall "concave"-shaped structure. A positioning groove (22) is formed in the middle of the surface of the positioning ceramic block (2), and a positioning through-hole (21) is formed at the center of the positioning groove (22).

3. A suppressor of a Faraday cup receiver according to claim 2, characterized in that, The positioning plate (12) is arranged in the positioning through-hole (21) of the positioning ceramic block (2) to limit the freedom degree of the precision electrode (1) in the vertical direction. The size of the positioning plate (12) matches the size of the positioning through-hole (21).

4. A suppressor of a Faraday cup receiver according to claim 3, characterized in that, The pole pieces (11) and the elastic pieces (14) of the precision electrode (1) are both arranged in the positioning groove (22) of the positioning ceramic block (2) to limit the freedom degree of the precision electrode (1) in the horizontal direction. The elastic pieces (14) are used to assist the positioning and engagement of the pole pieces (11) in the positioning groove (22).

5. The suppressor of a Faraday cup receiver according to claim 4, wherein The rectangular through-hole (13) is an ion beam channel. The wire (3) is of an overall "L"-shaped bent structure. A plane (31) is arranged at the end of the wire (3) welded to the precision electrode (1). The plane (31) is used to be welded to the positioning plate (12) of the precision electrode (1) to supply power to the precision electrode (1). The bending angle of the bent section of the wire (3) is a right angle.

6. The suppressor of a Faraday cup receiver according to claim 5, characterized in that, A through-hole (41) is formed at the center of the circle of the ceramic tube (4) for the insulated penetration of the wire (3).

7. A method for suppressing the suppressor of the Faraday cup receiver according to any one of the above claims 1 to 6, characterized in that Including the following steps: Step 1: Place the suppressor electrode of the Faraday cup receiver in front of the opening of the Faraday cup receiver. The rectangular through-hole in the middle of the precision electrode is aligned with the opening of the Faraday cup receiver to form a channel for the ion beam to enter the Faraday cup receiver. Accurately position the precision electrode in the positioning holes and positioning grooves of the positioning ceramic blocks. Step 2: The Faraday cup receiver is at ground potential. Connect the precision electrode to a negative voltage source through a wire. Since the potential of the precision electrode is lower than that of the Faraday cup receiver, a blocking electric field is formed between the Faraday cup receiver and the precision electrode. Step 3: The precise positioning of the precision electrode and the positioning ceramic block forms a mirror-symmetrical ideal blocking electric field; since the positioning ceramic block and the ceramic tube are insulating parts, they can isolate the precision electrode, the wire, the Faraday cup receiver and other conductor components; Step 4: When the ion beam flies through the rectangular through-hole in the middle of the precision electrode and enters the Faraday cup receiver, the secondary electrons generated by the impact of the ion beam and the Faraday cup receiver cannot escape from the detector under the action of the blocking electric field, effectively suppressing the escape of secondary electrons, thereby improving the receiving efficiency of the Faraday cup receiver.

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