A proton and negative hydrogen beam merging device

Abstract

The present invention discloses a proton and negative hydrogen beam merging device, comprising an anti-switch magnet, an extranuclear electron stripper, a vacuum chamber, a proton beam pipeline, a negative hydrogen beam pipeline, a merged beam pipeline, a proton beam, a negative hydrogen beam, a proton-negative hydrogen mixed beam, and a merged proton beam; the anti-switch magnet contains two upper and lower symmetrical magnetic poles, and the magnetic pole shape is preferably a symmetrical fan-shaped; one lateral end of the merged beam pipeline is fixedly connected to the beam outlet of the vacuum chamber, and the other end is adjacent to the extranuclear electron stripper at a certain distance; the overall shape of the extranuclear electron stripper is a disc, and the edge of the disc-shaped extranuclear electron stripper is provided with a plurality of stripping films at circumferential intervals, and the stripping film position of the disc-shaped extranuclear electron stripper is just enough to make the mixed beam pass through the middle of the stripping film in a direction perpendicular to the disc surface. The present invention uses the method of two beams with opposite charge polarities + an anti-switch magnet to achieve the effect of merging the same beams together.

Description

Technical Field

[0001] The invention belongs to the technical field of particle accelerators, and in particular relates to a proton and negative hydrogen beam merging device. Background Art

[0002] Particle accelerators are widely used in basic research on atomic nuclei, nuclear engineering, chemistry, radiation biology, radiation medicine, solid state physics, as well as diagnosis and treatment of diseases, activation analysis of high-purity substances, radiation processing of certain industrial products, radiation processing of agricultural products and other foods, simulation of cosmic radiation and simulation of nuclear explosions.

[0003] In the above research and production, there is a great demand for high-intensity proton beams with a certain energy, but due to the limitation of the proton beam intensity generated by a single particle accelerator, the demand is often not met. Due to the limitation of the proton beam intensity generated by a single particle accelerator, the demand is often not met, so it is urgent to design and develop a device that can merge beams with the same energy generated by different accelerators to obtain a high-intensity proton beam with a specified energy. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a proton and negative hydrogen beam merging device, aiming to solve the problem that the prior art cannot merge beams of the same energy and thus cannot meet the great demand for high-intensity proton beams with a certain energy in scientific research and production.

[0005] The present invention adopts the following technical solutions to solve the technical problems:

[0006] A proton and negative hydrogen beam merging device, characterized by comprising: an anti-switch magnet, an extranuclear electron stripper, a vacuum chamber, a proton beam pipeline, a negative hydrogen beam pipeline, a merging beam pipeline, a proton beam, a negative hydrogen beam, a proton-negative hydrogen mixed beam, and a proton beam after merging;

[0007] The anti-switch magnet contains two symmetrical magnetic poles, and the shape of the magnetic poles is preferably a symmetrical sector; the width of the magnetic pole at the beam entrance of the anti-switch magnet is greater than the width of the magnetic pole at the beam exit, and the magnetic field required for beam deflection can be generated between the upper and lower magnetic poles after the excitation current is passed;

[0008] The vacuum chamber is fixedly mounted in the counter-switch magnet and located between the upper and lower magnetic poles thereof, and the width of the beam inlet and outlet of the vacuum chamber matches the width of the beam inlet and outlet of the counter-switch magnet, and has a certain position adjustment function to adapt to the position deviation of the beam line and the magnet;

[0009] One transverse end of the combined beam pipeline is fixedly connected to the beam outlet of the vacuum chamber, and the other end is adjacent to the extranuclear electron stripper at a certain distance;

[0010] The proton beam pipeline and the negative hydrogen beam pipeline are located at the beam inlet of the vacuum chamber, and the combined beam pipeline is located at the beam outlet of the vacuum chamber. The three beam pipelines are connected to the vacuum chamber by flanges, and the connection has a vacuum sealing structure;

[0011] The overall shape of the exonuclear electron stripper is disc-shaped, and a plurality of stripping films are installed at circumferential intervals on the edge of the disc-shaped exonuclear electron stripper. The plane of the disc-shaped exonuclear electron stripper is perpendicular to the flow direction of the mixed beam, and the position of the stripping film of the disc-shaped exonuclear electron stripper is just enough to allow the mixed beam to pass through the middle of the stripping film in a direction perpendicular to the disc surface.

[0012] The three beam pipelines and the vacuum chamber are all in a vacuum environment, and the beam can pass through the vacuum environment; the proton and negative hydrogen beam merging device can merge the proton and negative hydrogen beams with the same energy after being accelerated by the particle accelerator into a proton beam.

[0013] The beam entrance and exit directions of the anti-switch magnet and the ordinary switch magnet are opposite, and the width of the magnetic pole at the beam entrance of the anti-switch magnet is greater than the width of the magnetic pole at the beam exit; the proton beam and the negative hydrogen beam with the same energy enter the magnetic field area between the upper and lower magnetic poles of the anti-switch magnet from symmetrical angles, and then deflect symmetrically, with the same lead-out trajectory, and merge into one beam, which is a proton-negative hydrogen mixed beam; the anti-switch magnet has two symmetrical magnetic poles, both sides of the magnetic poles are generally straight edges, the beam entrance end is an arc or a multi-segment broken line, and the beam exit end is a straight line.

[0014] The anti-switch magnet only needs a magnetic field in one direction, so the polarity of the power supply of the anti-switch magnet also only needs one direction.

[0015] When a negative hydrogen ion beam of a certain energy passes vertically through the stripping membrane of the extranuclear electron stripper, the two electrons outside the nucleus of the negative hydrogen ion are stripped off, and the negative hydrogen ion becomes a proton; after the proton-negative hydrogen mixed beam passes vertically through the stripping membrane, it is completely transformed into a proton beam, so that the proton-negative hydrogen mixed beam whose current intensity cannot be measured is transformed into a proton beam whose current intensity can be conveniently measured.

[0016] The anti-switch magnet can also allow a proton beam and a negative hydrogen beam with different energies to enter from the proton beam pipeline and the negative hydrogen beam pipeline respectively and merge them into a proton-negative hydrogen mixed beam. Since the two beams with different energies have different deflection radii in the magnetic field of the anti-switch magnet, the two beams need to enter the anti-switch magnet at different angles, that is, they need to enter the anti-switch magnet asymmetrically.

[0017] The proton beam merged by the proton and negative hydrogen beam merging device can also be used as a new proton beam and enter the next proton and negative hydrogen beam merging device to merge with another negative hydrogen beam with the same energy into a new proton beam to further improve the beam intensity; that is, multiple proton and negative hydrogen beam merging devices can be used in series as an extended use mode of the merging device.

[0018] Advantages and effects of the present invention

[0019] 1. The present invention uses two beams with opposite charge polarities + an anti-switching magnet to achieve the effect of merging the same beams. Specifically, two beams with opposite charge polarities are used to generate different deflection radii, and then the beams with different deflection radii are passed through an anti-switching magnet, so that beams with opposite charge polarities from different directions can be merged, thereby solving the first problem of merging beams of the same energy; the negative hydrogen ion extranuclear electrons in the proton-negative hydrogen mixed beam are stripped of the stripping membrane to turn them into protons, and the proton-negative hydrogen mixed beam is directly converted into a proton beam, and the mixed beam with positive and negative charges is converted into a beam with a single polarity of only protons, thereby solving the second problem that the same energy beam cannot measure the intensity of the merged beam due to the cancellation of positive and negative charges. The present invention cleverly uses the charge polarity characteristics to solve the problems of the two stages before and after the beam merger: before the merger, the beam merger is achieved by using the property that the beams with opposite charge polarities have opposite deflection directions in the same magnetic field; after the merger, the charges with opposite polarities are converted into charges with the same polarity by a stripper, so that the intensity of the merged beam can be measured.

[0020] 2. The proton beam after the proton and negative hydrogen beams are merged in the present invention can also be used as a new proton beam and enter the next proton and negative hydrogen beam merging device to be merged with another negative hydrogen beam with the same energy into a new proton beam to further improve the beam intensity, that is, multiple proton and negative hydrogen beam merging devices are used in series (this series use method can be used as an extended use method of the merging device of the present invention), and the beam intensity of the next stage in the series use is further increased relative to the previous stage. As the number of series stages increases, the beam intensity continues to increase, thereby maximally meeting the needs of scientific research and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The application method and structural schematic diagram of the proton and negative hydrogen beam merging device of the present invention.

[0022] Figure 2 Structural schematic diagram A of the proton and negative hydrogen beam merging device of the present invention.

[0023] Figure 3 Schematic diagram B of the structure of the proton and negative hydrogen beam merging device of the present invention.

[0024] Figure 4 Schematic diagram of the structure of the anti-switch magnet in the proton and negative hydrogen beam merging device of the present invention.

[0025] Figure 5 Schematic diagram of the magnetic pole structure of the anti-switch magnet in the proton and negative hydrogen beam merging device of the present invention.

[0026] Figure 6 Schematic diagram of the vacuum chamber structure in the proton and negative hydrogen beam merging device of the present invention.

[0027] Figure 7 Schematic diagram of the extranuclear electron stripper in the proton and negative hydrogen beam merging device of the present invention.

[0028] Figure 8 Schematic diagram of the stripping membrane rotating switching disk in the proton and negative hydrogen beam merging device of the present invention.

[0029] Figure numerals: 1. anti-switching magnet, 2. extranuclear electron stripper, 3. vacuum chamber, 4. proton beam pipeline, 5. negative hydrogen beam pipeline, 6. merged beam pipeline, 7. proton beam, 8. negative hydrogen beam, 9. proton-negative hydrogen mixed beam, 10. merged proton beam, 101. magnetic pole, 201. stripping film, 202. stripping film rotation switching disk. DETAILED DESCRIPTION

[0030] The present invention will be further explained below in conjunction with the accompanying drawings:

[0031] Design principle of the present invention

[0032] 1. To achieve different deflection radii for the same particle beams entering the same magnetic field vertically, the beam energies must be different: Under normal circumstances, if the types and energies (speeds) of particles in several beam lines are exactly the same, their deflection radii are the same when they pass through the same deflection magnet. When they pass through the same deflection magnet from different directions, it is impossible for them to be deflected onto the same beam line. If several beam lines are to be merged together, they must have different deflection radii.

[0033] 2. The principle that opposite charge polarity can achieve the merger of proton and negative hydrogen beams of equal energy: the charged particle beam is deflected in the magnetic field, and the deflection radius r=mv / Bq. Protons carry positive charge and negative hydrogen carries negative charge. Since the mass of protons is much higher than that of electrons, the two masses can be considered to be the same. If the energy and particle mass of the two beams are the same, the particle velocity v is the same. The two beams simultaneously and vertically enter the magnetic field generated by the same magnet, and the magnetic field B is the same. Protons carry a positive charge and negative hydrogen carries a negative charge, and the number of charges of the two is the same. Then, according to the formula r=mv / Bq, the deflection radius r of the two beams is the same. However, since protons carry positive charge and negative hydrogen carries negative charge, the polarity of the charges of the two are opposite, so when the proton and negative hydrogen beams of equal energy enter the same magnetic field vertically from the same side, the two beams are deflected in opposite directions. Therefore, the proton beam and negative hydrogen beam of equal energy enter the same magnetic field area from two symmetrical positions, and the two extracted beams can be overlapped by extracting the beams at the tangent position of the two deflection radius arcs.

[0034] 3. Innovative use principle of stripping membrane: Stripping membrane is usually used to strip the extranuclear electrons of a single negative hydrogen ion beam to convert it into a proton beam. Using stripping membrane to strip the extranuclear electrons of a negative hydrogen ion beam in a proton and negative hydrogen mixed beam, and directly converting the proton-negative hydrogen mixed beam into a single proton beam after stripping, is a major innovative use of stripping membrane.

[0035] 4. Innovative use principle of anti-switch magnet: anti-switch magnet Figure 4 , 5As shown, the anti-switch magnet has two symmetrical poles, and each pole is a fan-shaped structure that is symmetrical from left to right. The magnet body of the anti-switch magnet is the same as that of the general switch magnet, except that the beam in and out directions are opposite, that is, a form of reverse use of the switch magnet. The function of the switch magnet is to select and distribute a beam entering from the entrance to a specified extraction beam pipeline as needed. The switch magnet is a beam entering and deflecting through the magnetic field area of ​​the switch magnet. Corresponding to the size and direction of the different magnetic fields, the beam can be deflected to different extraction positions, that is, the beam can be switched to different extraction pipelines and then enter different beam lines. The switch magnet plays the role of switching the beam extraction direction distribution. The function of the anti-switch magnet described in this example is opposite to that of the anti-switch magnet. The direction of the beam movement is opposite to that of the switch magnet, that is, the beam inlet and outlet are opposite. The proton beam and the negative hydrogen beam with the same energy enter the magnetic field area between the upper and lower magnetic poles of the anti-switch magnet from symmetrical angles, and then deflect symmetrically, with the same extraction trajectory, and merge into a beam. This beam is a proton-negative hydrogen mixed beam. Since the anti-switch magnet 1 only needs one direction of magnetic field, the polarity of the power supply of the anti-switch magnet 1 also only needs one direction, and the magnetic field direction of the switch magnet is generally in two directions, positive and negative. In summary, the switch magnet is used to realize the switching of the beam between different beam lines, and the incoming beam and the outgoing beam are both one; and the anti-switch magnet 1 described in this example is used in the opposite direction to realize the merging of the proton beam and the negative hydrogen beam into a proton-negative hydrogen mixed beam, with two incoming beams and one outgoing beam. The traditional method of using a switch magnet cannot achieve the symmetrical entry of the two beams described above, because the entrance width of the traditional fan-shaped switch magnet is smaller than the exit width, and the entrance and exit are both single beam in and single beam out, that is, there is only one beam at the beam entrance, but the beam outflow direction can be multiple directions (the multiple directions of the beam are obtained by time sharing). The present invention uses the fan-shaped switch magnet in reverse, swaps the entrance and the exit, and makes the entrance width larger than the exit width, thereby achieving the goal of having two beams enter the entrance and a single beam flow out. This reverse usage method is the so-called anti-switch magnet, which is an innovative use of the switch magnet. The purposes of use and functions achieved by the two are completely different.

[0036] Based on the above invention principles, the present invention designs a proton and negative hydrogen beam merging device.

[0037] A proton and negative hydrogen beam merging device such as Figure 1 , characterized in that: it includes an anti-switch magnet 1, an extranuclear electron stripper 2, a vacuum chamber 3, a proton beam pipeline 4, a negative hydrogen beam pipeline 5, a combined beam pipeline 6, a proton beam 7, a negative hydrogen beam 8, a proton-negative hydrogen mixed beam 9, and a combined proton beam 10;

[0038] The anti-switch magnet 1 contains two symmetrical magnetic poles, and the shape of the magnetic poles is preferably a symmetrical sector; the width of the magnetic pole at the beam entrance of the anti-switch magnet 1 is greater than the width of the magnetic pole at the beam exit, and the magnetic field required for beam deflection can be generated between the upper and lower magnetic poles after the excitation current is passed;

[0039] The vacuum chamber 3 is fixedly mounted in the counter-switch magnet 1 and is located between the upper and lower magnetic poles thereof, and the width of the beam inlet and outlet of the vacuum chamber matches the width of the beam inlet and outlet of the counter-switch magnet 1, and has a certain position adjustment function to adapt to the position deviation of the beam line and the magnet;

[0040] One transverse end of the beam merging pipe 6 is fixedly connected to the beam outlet of the vacuum chamber 3, and the other end is adjacent to the extranuclear electron stripper 2 at a certain distance;

[0041] The proton beam pipeline 4 and the negative hydrogen beam pipeline 5 are located at the beam inlet of the vacuum chamber 3, and the combined beam pipeline 6 is located at the beam outlet of the vacuum chamber 3. The three beam pipelines are connected to the vacuum chamber 3 by flanges, and the connection has a vacuum sealing structure;

[0042] The overall shape of the exonuclear electron stripper 2 is a disk, and a number of stripping films are installed at circumferential intervals on the edge of the disk-shaped exonuclear electron stripper. The plane of the disk-shaped exonuclear electron stripper is perpendicular to the flow direction of the mixed beam 9, and the position of the stripping film of the disk-shaped exonuclear electron stripper 2 is just enough to allow the mixed beam 9 to pass through the middle of the stripping film in a direction perpendicular to the disk surface.

[0043] The three beam pipelines and the vacuum chamber are all in a vacuum environment, and the beam can pass through the vacuum environment; the proton and negative hydrogen beam merging device can merge the proton and negative hydrogen beams with the same energy after being accelerated by the particle accelerator into a proton beam.

[0044] like Figure 1 , 4 As shown in , 5, the beam entrance and exit directions of the anti-switch magnet 1 and the ordinary switch magnet are opposite, and the width of the magnetic pole 101 at the beam entrance of the anti-switch magnet 1 is greater than the width of the magnetic pole 101 at the beam exit; the proton beam and the negative hydrogen beam with the same energy enter the magnetic field area between the upper and lower magnetic poles 101 of the anti-switch magnet 1 from symmetrical angles, and then deflect symmetrically, with the same lead-out trajectory, and merge into one beam, which is a proton-negative hydrogen mixed beam; the anti-switch magnet 1 has two upper and lower symmetrical magnetic poles 101, the two sides of the magnetic poles 101 are generally straight edges, the beam entrance end is an arc or a multi-segment broken line, and the beam exit end is a straight line.

[0045] The anti-switch magnet 1 only needs a magnetic field in one direction, so the polarity of the power supply of the anti-switch magnet 1 also only needs one direction.

[0046] like Figure 1As shown, when the negative hydrogen ion beam of a certain energy passes vertically through the stripping membrane, the two electrons outside the nucleus of the negative hydrogen ion are stripped off and the negative hydrogen ion becomes a proton; after the proton-negative hydrogen mixed beam passes vertically through the stripping membrane, it is all converted into a proton beam, so that the proton-negative hydrogen mixed beam whose current intensity cannot be measured is converted into a proton beam whose current intensity can be conveniently measured.

[0047] The anti-switch magnet 1 can also allow a proton beam and a negative hydrogen beam with different energies to enter from the proton beam pipeline and the negative hydrogen beam pipeline respectively and merge them into a proton beam. Since the two beams with different energies have different deflection radii in the magnetic field of the anti-switch magnet 1, the two beams need to enter the anti-switch magnet 1 at different angles, that is, they need to enter the anti-switch magnet 1 asymmetrically.

[0048] The proton beam merged by the proton and negative hydrogen beam merging device can also be used as a new proton beam and enter the next proton and negative hydrogen beam merging device to merge with another negative hydrogen beam with the same energy into a new proton beam to further improve the beam intensity; that is, multiple proton and negative hydrogen beam merging devices can be used in series as an extended use mode of the merging device.

[0049] Example

[0050] The proton and negative hydrogen beam merging device of the present invention (such as Figure 1 , 2 , 3), the protons accelerated by the particle accelerator with the same energy and the negative hydrogen beam can be merged into a proton beam. The main process of its function is as follows:

[0051] (a) As Figure 1 , 2 As shown in FIG. 3 , after being accelerated by a particle accelerator, a proton beam and a negative hydrogen beam with the same energy enter the magnetic field region corresponding to the magnetic pole 101 of the anti-switch magnet 1 from a symmetrical angle position, and then deflect symmetrically, with the same extraction trajectory, and merge into a beam, which is a proton-negative hydrogen mixed beam.

[0052] (ii) Figure 1 , 2 , 3, 6, the beam passes through the vacuum chamber, the proton beam pipeline, the negative hydrogen beam pipeline and the combined beam pipeline, and the above spaces are vacuum environments suitable for the beam to pass through. In actual use, vacuum pumps are installed at appropriate locations in the beam pipeline and the vacuum chamber to maintain the vacuum environment in the above spaces.

[0053] (III) Figure 1 , 2, 7, 8. After the proton-negative hydrogen mixed beam passes vertically through the stripping membrane in the extranuclear electron stripper, the two electrons outside the nucleus of the negative hydrogen ion are stripped off, and the negative hydrogen ion becomes a proton, so that the proton-negative hydrogen mixed beam is completely transformed into a proton beam, realizing the merging of the proton and negative hydrogen beams into a proton beam.

[0054] Additional notes:

[0055] Compared with protons, the mass of electrons is very small and can be ignored here. The mass of protons and negative hydrogen ions are considered to be the same.

[0056] By adjusting the excitation current of the anti-switch magnet, the deflection radius of the proton and negative hydrogen beams can be adjusted, so that the two beams merge into one beam with the same trajectory after passing through the anti-switch magnet.

[0057] After passing through the anti-switching magnet, a proton beam and a negative hydrogen beam merge into a proton-negative hydrogen mixed beam. Because the measurement of beam intensity relies on collecting the number of beam charges, and the proton and negative hydrogen have opposite charges and cancel each other out, the intensity of the proton-negative hydrogen mixed beam cannot be measured. Therefore, an extranuclear electron stripper is used to strip off the two electrons outside the nucleus of the negative hydrogen ion, turning the negative hydrogen ion into a proton. In this way, the proton-negative hydrogen mixed beam becomes a separate proton beam, which can be conveniently measured for the intensity of the merged beam. The carbon stripping membrane in the extranuclear electron stripper has an extremely high efficiency of stripping the two electrons outside the nucleus of negative hydrogen ions with higher energy, close to 100%. When the proton-negative hydrogen mixed beam with higher energy passes vertically through the stripping membrane in the extranuclear electron stripper, the loss of beam energy is extremely small and can be ignored.

[0058] If you want to merge a proton beam and a negative hydrogen beam with different energies after being accelerated by a particle accelerator into one proton beam, because the two beams have different deflection radii in the magnetic field of the anti-switch magnet, the two beams need to enter the anti-switch magnet at different angles, that is, asymmetrically. In this case, the device can merge a proton beam and a negative hydrogen beam with different energies into one proton beam, or even merge multiple proton beams and negative hydrogen beams with different energies into one proton beam, which is an extended use of the present invention.

[0059] The proton and negative hydrogen beam merging device of the present invention can merge a proton beam and a negative hydrogen beam with the same energy after being accelerated by a particle accelerator into a proton beam. The merged proton beam can also be used as a new proton beam to enter the next proton and negative hydrogen beam merging device and merge with another negative hydrogen beam with the same energy into a new proton beam to further increase the beam intensity. That is, multiple proton and negative hydrogen beam merging devices can be used in series, which is an extended use mode of the present invention.

[0060] After the protons and negative hydrogen beams are mixed, the probability of the two combining into two hydrogen atoms is very low because the sizes of protons and negative hydrogen ions are very small relative to their average distance; even if the two combine into hydrogen atoms, when the hydrogen atoms pass through the stripping membrane, the stripping membrane will strip off the electrons outside the hydrogen atom's nucleus, turning the hydrogen atoms into protons.

[0061] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, and thus the present invention includes but is not limited to the embodiments described in the specific implementation manner.

Claims

1. A method for merging proton and negative hydrogen beams, characterized in that: Including an anti-switch magnet, an extranuclear electron stripper, a vacuum chamber, a proton beam pipeline, a negative hydrogen beam pipeline, a merged beam pipeline, a proton beam, a negative hydrogen beam, a proton-negative hydrogen mixed beam, and a merged proton beam; The anti-switch magnet contains two symmetrical magnetic poles, which are in the shape of a symmetrical sector. The width of the magnetic pole at the beam entrance of the anti-switch magnet is greater than the width of the magnetic pole at the beam exit. After the excitation current is passed, the magnetic field required for beam deflection is generated between the upper and lower magnetic poles. The vacuum chamber is fixedly mounted in the counter-switch magnet and located between the upper and lower magnetic poles thereof, and the width of the beam inlet and outlet of the vacuum chamber matches the width of the beam inlet and outlet of the counter-switch magnet, and has a certain position adjustment function to adapt to the position deviation of the beam line and the magnet; One transverse end of the combined beam pipeline is fixedly connected to the beam outlet of the vacuum chamber, and the other end is adjacent to the extranuclear electron stripper at a certain distance; The proton beam pipeline and the negative hydrogen beam pipeline are located at the beam inlet of the vacuum chamber, and the combined beam pipeline is located at the beam outlet of the vacuum chamber. The three beam pipelines are connected to the vacuum chamber by flanges, and the connection has a vacuum sealing structure; The overall shape of the exo-nuclear electron stripper is a disk, and a plurality of stripping films are installed at intervals along the circumference of the edge of the disk-shaped exo-nuclear electron stripper. The plane of the disk-shaped exo-nuclear electron stripper is perpendicular to the flow direction of the mixed beam, and the position of the stripping films of the disk-shaped exo-nuclear electron stripper is just enough to make the mixed beam pass through the middle of the stripping films along the direction perpendicular to the disk surface. The three beam pipes and the vacuum chamber are all vacuum environments, and the beams pass through the vacuum environment; the merging method: the anti-switch magnet allows a proton beam and a negative hydrogen beam with different energies after being accelerated by a particle accelerator to enter from the proton beam pipe and the negative hydrogen beam pipe respectively and merge them into a proton-negative hydrogen mixed beam. Since the two beams of different energies have different deflection radii in the magnetic field of the anti-switch magnet, the two beams need to enter the anti-switch magnet at different angles, that is, they enter the anti-switch magnet asymmetrically.

2. A method for merging proton and negative hydrogen beams as claimed in claim 1, characterized in that: The beam entrance and exit directions of the anti-switch magnet and the switch magnet are opposite, and the width of the magnetic pole at the beam entrance of the anti-switch magnet is greater than the width of the magnetic pole at the beam exit; the anti-switch magnet has two magnetic poles that are symmetrical up and down, and the two sides of the magnetic poles are straight edges, the beam entrance end is an arc or a multi-segment broken line, and the beam exit end is a straight line.

3. A method for merging proton and negative hydrogen beams as claimed in claim 2, characterized in that: The anti-switch magnet only needs a magnetic field in one direction, so the polarity of the power supply of the anti-switch magnet also only needs one direction.

4. A method for merging proton and negative hydrogen beams as claimed in claim 1, characterized in that: When a negative hydrogen ion beam of a certain energy passes vertically through the stripping membrane of the extranuclear electron stripper, the two electrons outside the nucleus of the negative hydrogen ion are stripped off, and the negative hydrogen ion becomes a proton; after the proton-negative hydrogen mixed beam passes vertically through the stripping membrane, it is completely transformed into a proton beam, so that the proton-negative hydrogen mixed beam whose current intensity cannot be measured is transformed into a proton beam whose current intensity can be conveniently measured.

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