Isotope ion separation method and system based on combination of quadrupole magnet and dipole magnet

Abstract

The invention discloses a quadrupole magnet and dipole magnet combined isotope ion separation method and a quadrupole magnet and dipole magnet combined isotope ion separation system, and the separation method comprises the following steps: S1, an ion source leads out a strip-shaped beam with certain energy and a divergence angle, and the beam contains target isotope ions to be separated; s2, the strip-shaped beam is freely transmitted through a field-free region in the vacuum pipeline and then enters a quadrupole magnet, and power is supplied to the quadrupole magnet so as to generate a quadrupole magnetic field used for beam focusing; s3, the strip-shaped beam passing through the quadrupole magnet is freely transmitted through a field-free region and then enters a dipole magnet, power is supplied to the dipole magnet so as to generate a dipole magnetic field used for beam deflection and target isotope ion separation, and after the strip-shaped beam passes through a dipole magnetic field group, high-purity target isotope ions are generated; the quadrupole magnet and dipole magnet combined isotope ion separation method can effectively reduce the loss of the beam in the transmission process, thereby improving the separation yield of the target isotope.

Description

Technical Field

[0001] The present invention relates to the technical field of isotope electromagnetic separators, and particularly relates to a method and system for separating isotope ions by combining a quadrupole magnet and a dipole magnet. Background Art

[0002] Traditional separation systems use a single separation magnet. After a high-intensity ribbon ion beam passes through a single deflection magnet, serious second-order aberrations are extremely likely to occur, which in turn causes the distortion of the ion beam shape and significantly reduces the mass resolution of the separation system. In addition, in order to improve the mass resolution ability, a deflection angle of 180° is generally selected for traditional separation magnets, which undoubtedly significantly increases the volume and weight of the separation system. An electrostatic focusing and acceleration system for an isotope separation system with the publication number CN112516797B uses the methods of electrostatic focusing and acceleration to increase the resolution of the separation magnet and improve the isotope separation purity. However, for a separation system with a high-intensity beam, adding electrostatic focusing and high-voltage acceleration electrodes increases the system volume on the one hand and the probability of high-voltage arcing on the other hand, and the engineering practicability and reliability are not high. Summary of the Invention

[0003] The object of the present invention is to provide a method and system for separating isotope ions by combining a quadrupole magnet and a dipole magnet, which can effectively reduce the loss of the beam during transmission, thereby improving the separation yield of the target isotope, and the overall structure is simple, the installation is flexible, and the maintenance is convenient.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a method for separating isotope ions by combining a quadrupole magnet and a dipole magnet, including the following steps:

[0006] S1: An ion source extracts a ribbon beam with a certain energy and divergence angle, and the beam contains target isotope ions to be separated, as well as various other isotope ions and impurity ions;

[0007] S2: The ribbon beam freely transmits through a field-free region in a vacuum pipeline and then enters a quadrupole magnet, and the quadrupole magnet is powered to generate a quadrupole magnetic field for beam focusing;

[0008] S3: The ribbon beam passing through the quadrupole magnet freely transmits through a field-free region and then enters a dipole magnet, and the dipole magnet is powered to generate a dipole magnetic field for beam deflection and separation of target isotope ions. After passing through the dipole magnetic field group, high-purity target isotope ions will be generated.

[0009] In the second aspect, the present invention also provides an isotope ion separation system combining a quadrupole magnet and a dipole magnet, including: a vacuum pipeline, at least two quadrupole magnets and dipole magnets.

[0010] The vacuum pipe sequentially passes through the at least two quadrupole magnets and dipole magnets. The beam generated by the ion source is transmitted in the vacuum pipe, and the beam sequentially passes through the magnetic fields formed by the at least two quadrupole magnets and the magnetic field formed by the dipole magnet.

[0011] The at least two quadrupole magnets form a lens structure for reducing the transverse divergence angle of the beam, and play a role in constraining and focusing the beam.

[0012] The dipole magnet is used for separating and purifying target ions.

[0013] In the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by at least one embodiment of the present disclosure, there are two dipole magnets, and a first slit member is provided between the two dipole magnets.

[0014] The first slit member is located at the image distance focal plane position of the previous dipole magnet, and only allows ions within a fixed width range at the focal plane to pass through and enter the next dipole magnet.

[0015] In the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by at least one embodiment of the present disclosure, the quadrupole magnet includes an outer contour and four pole tips.

[0016] The adjacent pole tips have opposite polarities, and the included angle between the adjacent pole tips is 90°.

[0017] All four pole tips are fixedly connected to the outer contour, and the magnetic field circulates through each pole tip and forms a magnetic field loop with the outer contour.

[0018] In the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by at least one embodiment of the present disclosure, the magnetic field gradient of the quadrupole magnet ranges from 3 to 20 T / m.

[0019] In the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by at least one embodiment of the present disclosure, the deflection angle of the dipole magnet is 60 - 120°.

[0020] In the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by at least one embodiment of the present disclosure, it further includes: an electric field separation unit.

[0021] The electric field separation unit is connected in series behind the dipole magnet. A second slit member is provided between the electric field separation unit and the dipole magnet. The second slit member is located at the image distance focal plane position of the dipole magnet, and the second slit member only allows ions within a fixed width range at the focal plane to pass through and enter the electric field separation unit.

[0022] The beneficial effects of the present invention are as follows: The present invention adopts a quadrupole lens group, which can effectively reduce the transverse emittance of the beam, alleviate the space charge effect, and further make the beam entering the dipole magnet for deflection and separation more stable and concentrated, effectively reducing the isotope doping phenomenon caused by beam divergence.

[0023] By using a quadrupole lens to focus the beam and combining with the design of a large transmission aperture, the loss of the beam during transmission can be effectively reduced, thereby improving the separation yield of the target isotope, which helps to alleviate the current tight supply situation of high-purity isotopes and meet the large demand for high-purity stable isotopes and the production of radioactive medical isotopes in fields such as nuclear physics experiments, satellite navigation, and basic research. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of an isotope ion separation system combining a quadrupole magnet and a dipole magnet in Embodiment 1.

[0026] Figure 2 It is a schematic connection diagram of a vacuum pipeline and a quadrupole magnet in Embodiment 1.

[0027] Figure 3 It is a schematic structural diagram of an isotope ion separation system combining a quadrupole magnet and a dipole magnet in Embodiment 2.

[0028] In the figure:

[0029] 10. Vacuum pipeline;

[0030] 20. Quadrupole magnet;

[0031] 30. Dipole magnet; 31. First slit member. Detailed Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments with reference to the drawings in the embodiments. Obviously, the described embodiments are only some of the embodiments, rather than all of the embodiments.

[0033] Traditional separation systems use a single separation magnet. After a high-intensity ribbon ion beam passes through a single deflection magnet, serious second-order aberrations are likely to occur, which in turn cause distortion of the ion beam shape, resulting in a significant reduction in the mass resolution of the separation system. To this end, the embodiment provides an isotope ion separation method and system combining a quadrupole magnet and a dipole magnet; the isotope ion separation method combining the quadrupole magnet and the dipole magnet includes the following steps:

[0034] S1: An ion source extracts a ribbon beam with a certain energy and divergence angle. The beam contains target isotope ions to be separated, as well as various other isotope ions and impurity ions;

[0035] S2: The ribbon beam freely travels through a field-free region in a vacuum pipe and then enters a quadrupole magnet. The quadrupole magnet is powered to generate a quadrupole magnetic field for beam focusing;

[0036] S3: The ribbon beam passing through the quadrupole magnet freely travels through a field-free region and then enters a dipole magnet. The dipole magnet is powered to generate a dipole magnetic field for beam deflection and separation of target isotope ions. After passing through the dipole magnetic field group, high-purity target isotope ions will be generated.

[0037] Next, a general introduction will be given to an isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by the embodiments of the present disclosure.

[0038] An isotope ion separation system combining a quadrupole magnet and a dipole magnet provided by this embodiment includes a vacuum pipe, at least two quadrupole magnets and dipole magnets. The vacuum pipe sequentially passes through at least two quadrupole magnets and dipole magnets. The beam generated by the ion source travels in the vacuum pipe, and the beam sequentially passes through the magnetic fields formed by at least two quadrupole magnets and the magnetic fields formed by dipole magnets.

[0039] Two or more groups of quadrupole magnets form a lens structure, whose core function is to reduce the beam's transverse divergence angle. Since the space charge effect of a low-energy high-intensity beam will cause the beam divergence angle to be too large, and the lens structure formed by the quadrupole magnet can effectively alleviate this problem and play a role in constraining and focusing the beam. This embodiment adopts a unique combination method and parameter determination method to meet specific magnetic field gradient requirements and beam focusing effects.

[0040] The quadrupole magnet is an electromagnet with a modular design, which generates a quadrupole magnetic field. The magnetic field intensity changes linearly with position. By adjusting the coil current, the magnetic field gradient can be changed. By adjusting the magnetic field gradient, the focusing and defocusing intensities can be changed to adapt to ion beams of different energies and types.

[0041] Adjacent pole tips have opposite polarities, and the included angle between adjacent pole tips is 90°. The magnetic field circulates through each pole tip and forms a magnetic field loop with the outer contour of the lens. Particles are affected by the Lorentz force and produce opposite effects in the x and y directions when passing through the quadrupole magnet. Therefore, multiple sets of quadrupole magnets can achieve two-direction focusing.

[0042] In some embodiments, in the quadrupole magnet combination structure, a structure form with two quadrupole magnets as a group is adopted, where the focusing directions of the two quadrupole magnets are opposite. According to the parameters of the beam in the transverse direction, the thickness and ampere-turns of the magnet are adjusted.

[0043] In some embodiments, in the quadrupole magnet combination structure, a structure form with three quadrupole magnets as a group is adopted, where the thickness of the middle quadrupole magnet is greater than that of the two quadrupole magnets on both sides. There is a certain interval distance between each quadrupole magnet. The focusing directions of the first and third quadrupole magnets are the same, while the focusing direction of the second quadrupole magnet is opposite to the former two. Through the alternating focusing and defocusing effects, the transverse emittance of the beam is effectively controlled, and the beam divergence caused by the space charge effect is suppressed.

[0044] The magnetic field gradient range of a single modular quadrupole magnet is 3 - 20 T / m. Since the magnetic field gradient is proportional to the ampere-turns, the corresponding ampere-turns range can be determined to be approximately 1000 - 10000 ampere-turns. During the actual operation process, different magnetic field gradients can be precisely regulated by adjusting the current flowing through the coil. The pole tip shape design of a single modular quadrupole magnet adopts a magnetic pole shape of hyperbola plus straight line. Based on the maximum width of the beam envelope, the range of the inscribed circle radius of the pole tip is determined to be 50 - 200 mm, and the design value is usually 1 - 2 times the maximum envelope. The pole face width and the hyperbola disconnection position are determined by the inscribed circle radius, and the hyperbola pole face equation is also constructed based on the size of the inscribed circle radius. The length of a single modular quadrupole magnet is determined by the formula L eff = L M + ka, where L eff represents the effective length of the quadrupole magnet, L ML is the mechanical length, k is the proportionality factor (in the range of approximately 0.5 - 2), and a is the inscribed circle radius of the quadrupole magnet. The spacing distance between a group of quadrupole magnets is jointly composed of the difference between the effective length and the mechanical length. After determining the ampere-turns of a single modular quadrupole magnet, according to the material properties of the coil, heat dissipation requirements, output capacity of the power supply, etc., the number of turns and the magnitude of the current of the coil are designed and distributed. The coil is selected as a hollow copper tube wire with a square outside and a round inside, and the winding method is designed according to the ampere-turns. For example, when the ampere-turns is 6000, the 60×100 scheme is adopted (60 turns per pole, 100A current, winding method 6×10, 10 layers in the pole head direction, 6 layers in the wire package thickness). The power supply for a group of quadrupole magnets adopts an independent power supply or a combination of series / parallel power supplies, which not only reduces costs but also enables independent and flexible adjustment. The power supply is selected with a specification of 24V and 100A, and the current stability is better than one in a million. In terms of the cooling system, a water-cooling method is adopted, and each wire package has an independent water-cooling channel. The designed temperature rise is strictly controlled not to exceed 20°C to avoid the influence of excessive temperature rise on the lens performance.

[0045] Among them, two or more groups of dipole magnets form a separating magnet for the separation and purification of target ions. After the beam is focused by the quadrupole magnet system, it enters a group of dipole magnets or enters multiple groups of dipole magnets connected in series in sequence. The beam deflects in the dipole magnet, and based on the principle that different isotope ions have different deflection trajectories in the magnetic field due to mass differences, the separation of target isotope ions is achieved.

[0046] The dipole magnet adopts a modular designed electromagnet. According to the types of target isotope ions to be separated, appropriate deflection angles, central orbit radii, magnetic field gradients, object distances and image distances, resolutions, and aberration elimination methods, etc. are selected.

[0047] The separation system of the modular quadrupole magnet and dipole magnet proposed by the present invention has a simple structure, flexible installation, convenient maintenance, and the overall volume and weight are reduced by more than 50% compared with traditional electromagnetic separators. At the same time, the construction cost is greatly reduced, and it has very high economic benefits.

[0048] In some embodiments, the dipole magnet adopts the structural form of a single dipole magnet. An electric field separation unit can also be connected in series behind this dipole magnet to replace the second dipole magnet. A second slit member is placed between the electric field separation unit and the dipole magnet. The position of the second slit member is at the image distance focal plane position of the above-mentioned dipole magnet, and only ions within a fixed width range at the focal plane are allowed to pass through the slit and enter the electric field separation unit. An electrostatic field is applied to the electric field separation unit, and according to the charge and kinetic energy parameters of the target isotope ions to be separated, appropriate electrode structures and power supply parameters are selected to achieve the purpose of further purifying the target isotope ions.

[0049] In some embodiments, the combination method of the dipole magnets adopts the structural form of two identical dipole magnets connected in series in sequence.

[0050] In some embodiments, the combination mode of the dipole magnets adopts the structural form of two dipole magnets with different parameters, which are connected in series in sequence. For the dipole magnet group connected in series, a first slit member is placed between the two dipole magnets. The position of the first slit member is at the image distance from the focal plane of the first dipole magnet above, and only ions within a fixed width range at the focal plane are allowed to pass through the slit and enter the second dipole magnet. The purpose of the above different structural forms is to be selected according to the types, purity, and yield of the ions to be separated.

[0051] The deflection angle range of a single modular dipole magnet is between 60° and 120°. Considering the effective separation of beam isotope ions in a compact space, while effectively reducing the volume and weight of the magnet, thereby reducing the volume and weight of the separation system. The selection of the central orbit radius is closely related to the magnetic field strength. In the present invention, the designed range of the central orbit radius is 500 - 2000 mm. The material used for the pole face is DT4 electro-pure iron, and the relative magnetic permeability is about 1000. The magnetic field design of the dipole magnet adopts a gradient magnetic field structure, and the magnetic field gradient range is limited within the interval greater than 0 and less than 1. It can achieve focusing in two transverse directions. Without changing the central orbit radius of the separation system, it can greatly improve the dispersion in the horizontal direction, and at the same time effectively eliminate the second-order angular aberration caused by the divergence of the ion beam at the focal plane position. In this way, under the condition of a relatively compact design size, the mass resolution of the separation system can be effectively improved. By determining the transfer matrix of the beam in the dipole magnet, the relationship between the magnetic field gradient, central orbit radius, deflection angle and object distance, image distance can be clarified. In the present invention, under the conditions of a fixed magnetic field gradient, deflection radius and deflection angle, a focused target ion beam can be generated within a relatively small image distance interval (500 mm to 1000 mm). At the same time, for isotopes with a mass difference of 1%, the separation distance can reach the range of 10 mm to 30 mm. The designed value of the second-order term coefficient of the magnetic field of a single modular dipole magnet is between 0.2 and 0.3. By setting inlays of different sizes at both ends of the two pole faces of the dipole magnet, the magnetic field distribution can be finely adjusted, thereby changing the value of the second-order term coefficient to effectively suppress aberration and improve the beam focusing quality.

[0052] The magnetic field strength of the central plane orbit of a single modular dipole magnet is determined by the ampere-turns of the magnet coil. In practical applications, the magnetic field strength of the dipole magnet is changed by adjusting the coil current. The width and height of the magnet gap are calculated based on the beam transport matrix, and the width and height at the maximum beam envelope are used as the design criteria. The designed gap height range of the present invention is 200 mm to 500 mm, and the width range is 500 mm to 1000 mm, ensuring the effective installation of the vacuum pipe and the stable transmission of the beam, and avoiding magnetic field leakage or beam loss. The design of the inclination angle of the dipole magnet pole face is given according to the mathematical relationship between the pole face inclination angle and the magnetic field gradient. The designed pole face inclination angle range of the present invention is 2 - 10°. By reasonably setting the pole face inclination angle, the magnetic field distribution can be optimized and the performance of the dipole magnet can be improved. The power supply of a group of dipole magnets adopts a combination of independent power supply or series / parallel power supply, which not only reduces costs but also enables independent and flexible adjustment.

[0053] According to the maximum magnetic field strength of the magnet central orbit, its ampere-turns and winding method are designed. The number of turns of the upper and lower coils of the magnet each accounts for 50% of the total number of turns, and a symmetric distribution method is adopted. On this basis, the power supply parameters are determined, and a DC power supply of about 21V and 150A is selected for power supply, and the current stability is better than one in a million. Such a power supply parameter setting can meet the magnetic field requirements while reserving a certain current margin to cope with various possible working condition changes and ensure the stable operation of the system. For the design of the wire package, if 6 layers are selected in the vertical cross-section direction and each wire package has 8 layers, that is, a 6×8 structural form is adopted. In terms of the cooling method, a method of two turns of wire with one-way water is adopted, and a total of three-way cooling water is equipped for each wire package. Through such a cooling design, the temperature rise can be effectively controlled to ensure that the temperature rise of the wire package is less than 15°C, so as to ensure that the magnet works in a stable temperature environment and maintain the stability of its performance.

[0054] In the part of the vacuum pipe, to meet specific physical requirements and engineering feasibility, a pipe with a circular cross-section is selected as the vacuum pipe in the quadrupole magnet pole head gap, and a flat pipe with a rectangular cross-section is selected as the vacuum pipe in the dipole magnet pole gap. Standard welded CF flanges are used to connect the vacuum pipes of each cross-section to ensure vacuum sealing performance while achieving stable and efficient connection, and to ensure the stability and continuity of particles during transmission. The vacuum pipe materials are all made of 316L non-magnetic stainless steel. The vacuum pipe is connected to a vacuum pump group to obtain the required vacuum degree. The vacuum pump group includes a molecular pump, a mechanical pump, and vacuum degree measuring elements, etc.

[0055] Embodiment 1

[0056] Figure 1 Shows a specific structure of an isotope ion separation system combining a quadrupole magnet and a dipole magnet according to an embodiment of the present disclosure.

[0057] AsFigure 1 and 2 As shown in 2 , the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided in this embodiment includes: a vacuum pipe 10, a quadrupole magnet 20, and a dipole magnet 30.

[0058] Specifically, the vacuum pipe 10 sequentially passes through the quadrupole magnet 20 and the dipole magnet 30. The beam generated by the ion source is transmitted in the vacuum pipe 10, and the beam sequentially passes through the magnetic fields formed by the quadrupole magnet 20 and the dipole magnet 30.

[0059] Specifically, there are three quadrupole magnets 20, and the three quadrupole magnets 20 form a lens structure for reducing the transverse divergence angle of the beam and playing a role in constraining and focusing the beam. The dipole magnet 30 is used for separating and purifying the target ions.

[0060] Specifically, there are two dipole magnets 30, the deflection angle of the dipole magnet 30 is 90°, and a first slit member 31 is provided between the two dipole magnets 30; the first slit member 31 is located at the image distance focal plane position of the previous dipole magnet 30, and only allows ions within a fixed width range at the focal plane to pass through and enter the latter dipole magnet 30.

[0061] Specifically, the quadrupole magnet 20 includes an outer contour (not shown) and four pole tips (not shown); adjacent pole tips have opposite polarities, and the included angle between adjacent pole tips is 90°; all four pole tips are fixedly connected to the outer contour, and the magnetic field circulates through each pole tip and forms a magnetic field loop with the outer contour.

[0062] Embodiment 2

[0063] Figure 3 Shows another example structure of an isotope ion separation system combining a quadrupole magnet and a dipole magnet according to an embodiment of the present disclosure.

[0064] As Figure 3 shown, the difference between the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided in this embodiment and that in Embodiment 1 is that: there is only one dipole magnet 30, and the deflection angle of the dipole magnet 30 is 60°.

[0065] Embodiment 3

[0066] The difference between the isotope ion separation system combining a quadrupole magnet and a dipole magnet provided in this embodiment and that in Embodiment 2 is that: it further includes: an electric field separation unit.

[0067] The electric field separation unit is connected in series behind the dipole magnet. A second slit member (not shown) is provided between the electric field separation unit and the dipole magnet. The second slit member is located at the image distance focal plane position of the dipole magnet. The second slit member only allows ions within a fixed width range at the focal plane to pass through and enter the electric field separation unit.

[0068] An electrostatic field is applied to the electric field separation unit. According to the charge and kinetic energy parameters of the target isotope ions to be separated, appropriate electrode structures and power supply parameters are selected to further purify the target isotope ions.

[0069] Although the embodiments of the present application have been shown and described above, the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of without creative efforts should be covered within the protection scope of the present invention; unless otherwise clearly stated, any element, action or instruction used in this article should not be construed as critical or necessary.

Claims

1. An isotope ion separation method combining a quadrupole magnet and a dipole magnet, characterized in that, It includes the following steps: S1: The ion source extracts a ribbon beam with a certain energy and divergence angle. The beam contains target isotope ions to be separated, as well as various other isotope ions and impurity ions; S2: The ribbon beam freely transports in the vacuum pipe and then enters the quadrupole magnet after passing through the field-free region. The quadrupole magnet is powered to generate a quadrupole magnetic field for beam focusing; S3: The ribbon beam passing through the quadrupole magnet freely transports in the field-free region and then enters the dipole magnet. The dipole magnet is powered to generate a dipole magnetic field for beam deflection and separation of target isotope ions. After passing through the dipole magnetic field group, high-purity target isotope ions will be generated.

2. An isotope ion separation system combining a quadrupole magnet and a dipole magnet, characterized in that, It includes: A vacuum pipe, at least two quadrupole magnets and dipole magnets; The vacuum pipe sequentially passes through the at least two quadrupole magnets and dipole magnets. The beam generated by the ion source transports in the vacuum pipe, and the beam sequentially passes through the magnetic fields formed by the at least two quadrupole magnets and the magnetic field formed by the dipole magnet; The at least two quadrupole magnets form a lens structure for reducing the transverse divergence angle of the beam and playing a role in constraining and focusing the beam; The dipole magnet is used for separating and purifying target ions.

3. An isotope ion separation system comprising a combination of a quadrupole magnet and a dipole magnet according to claim 2, characterized in that, There are two dipole magnets, and a first slit member is arranged between the two dipole magnets; The first slit member is located at the image-distance focal plane position of the previous dipole magnet, and only allows ions within a fixed width range at the focal plane to pass through and enter the subsequent dipole magnet.

4. The isotope ion separation system composed of a quadrupole magnet and a dipole magnet according to claim 2, characterized in that, The quadrupole magnet includes an outer contour and four pole tips; The adjacent pole tips have opposite polarities, and the included angle between the adjacent pole tips is 90°; All four pole tips are fixedly connected to the outer contour, and the magnetic field circulates in each pole tip and forms a magnetic field loop with the outer contour.

5. The isotope ion separation system combining a quadrupole magnet and a dipole magnet according to claim 2, wherein The magnetic field gradient range of the quadrupole magnet is 3 - 20 T / m.

6. The isotope ion separation system combining a quadrupole magnet and a dipole magnet according to claim 2, characterized in that, The deflection angle of the dipole magnet is 60 - 120°.

7. An isotope ion separation system comprising a combination of a quadrupole magnet and a dipole magnet according to claim 2, characterized in that, It also includes: an electric field A separation unit; The electric field separation unit is connected in series behind the dipole magnet, and a second slit member is arranged between the electric field separation unit and the dipole magnet; The second slit member is located at the image-distance focal plane position of the dipole magnet, and the second slit member only allows ions within a fixed width range at the focal plane to pass through and enter the electric field separation unit.

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