CN118591073A - Generating high-current-strength He2+Magnet system for ECR ion source of ions - Google Patents
Generating high-current-strength He2+Magnet system for ECR ion source of ions Download PDFInfo
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- 150000002500 ions Chemical class 0.000 title claims abstract description 99
- 239000001307 helium Substances 0.000 claims abstract description 16
- 229910052734 helium Inorganic materials 0.000 claims abstract description 16
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 10
- 230000000452 restraining effect Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- 210000002381 plasma Anatomy 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 helium ions Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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- Electron Sources, Ion Sources (AREA)
Abstract
The invention provides a magnet system of ECR ion source for generating high-current-intensity He 2+ ions, which utilizes the structural space of the original 2.45GHzECR ion source, increases a constraint magnetic field formed by alternately arranging radial magnetic fields and tangential magnetic fields, and is characterized in that: the confining area formed by the confining magnetic field is nearly equal to the resonance area of helium di-positive ions generated in the middle of the discharge cavity, the helium di-positive ions and electrons are confined in the resonance area in the middle of the discharge cavity through the confining magnetic field, and the proportion of the helium di-positive ions in the mixed beam of the resonance area is improved; the radial tangential confinement magnet is added into the low-frequency ECR ion source which is only suitable for generating single charge state, so that helium di-positive ions with high current intensity in medium charge state are generated, and the optimal combination point is found between the improvement of the yield of helium di-positive ions and the reduction of the cost.
Description
Technical Field
The invention belongs to the technical field of cyclotrons, and particularly relates to a magnet system of an ECR ion source for generating high-current-intensity He 2+ ions.
Background
Multiply Charged Ions (MCIs) are a necessary condition to increase the output energy of the accelerator particles. The low frequency (e.g., 2.45 GHz) ECR sources are more economical to manufacture than high frequency ECR ion sources that require very strong axial and radial fields.
The low-frequency 2.45GHzECR ion source has the advantages of compact structure, long service life, stable source operation, low economic cost and the like. Thus, some researchers have suggested using a 2.45GHzECR ion source to generate a moderately charged ion beam current. The conventional magnetic field configuration of 2.45GHzECR ion sources, whether permanent magnets or electromagnetic coils are used, is broadly divided into a resonant magnetic field (875 Gs or 930 Gs), an off-resonant magnetic field, and a magnetic mirror field, and 2.45GHzECR ion sources have achieved significant results in generating singly charged positive ions by virtue of the axial resonant field alone.
But for a 2.45GHzECR ion source, the current extracted beam is actually a mixed beam. The mixed beam mainly comprises He 2+ and He + plasma, and the generation of He 2+ and the generation of He + are different in that the steps are one step more than the steps of generating protons by hydrogen, because collision is carried out twice and is stepwise collision ionization, helium positive is generated first, and helium di-positive is generated again.
The difficulty in generating He 2+ with a 2.45GHzECR ion source is: because of the secondary collision, the dissociation, recombination and charge exchange processes are involved, and because of the dissociation, recombination and charge exchange processes, the proportion of helium produced is particularly small, and the proportion of helium 2+ produced in the mixed beam is far from sufficient.
Disclosure of Invention
The invention provides a magnet system of an ECR ion source for generating high-current-intensity He 2+ ions, aiming at solving the problems that the proportion of He 2+ generated by the prior art is particularly small and the proportion is far from enough.
The invention provides the following technical scheme for solving the technical problems:
The magnet system of ECR ion source for generating high-current strong He 2+ ion, the system utilizes the structural space of original 2.45GHzECR ion source, and increases the constraint magnetic field formed by alternately arranging radial magnetic field and tangential magnetic field, and is characterized in that: the restraining region formed by the restraining magnetic field is approximately equal to the resonance region of He 2+ ions generated in the middle of the discharge cavity, and He + ions and electrons are restrained in the resonance region in the middle of the discharge cavity by the restraining magnetic field, so that the proportion of helium di-positive ions in the mixed beam of the resonance region is improved;
Further, the structural space of the original 2.45GHzECR ion source is as follows: arranged axially from one end to the other: injecting a magnetic ring, a middle magnetic ring and a leading-out magnetic ring; arranged from inside to outside along the radial direction: a discharge cavity, a cartridge clip device and a middle magnetic ring; injection magnetic rings and extraction magnetic rings are arranged on two sides of the discharge cavity; the cartridge clip device is sleeved with a middle magnetic ring a discharge chamber of the inner sleeve; the inner diameter and the outer diameter of the injection magnetic ring, the middle magnetic ring and the extraction magnetic ring are the same.
Further, the constraint magnetic field is composed of a plurality of radial magnetic rods, lengths and areas of the radial magnetic rod cuboids, residual magnetic quantity of the radial magnetic rods, a plurality of tangential magnetic rods, lengths and areas of the tangential magnetic rod cuboids and residual magnetic quantity of the tangential magnetic rods, wherein the radial magnetic rods, the lengths and areas of the radial magnetic rod cuboids, the residual magnetic quantity of the radial magnetic rods, the tangential magnetic rods and the residual magnetic quantity of the tangential magnetic rods are uniformly distributed on the backup groove of the cartridge clip device in the circumferential direction.
Further, the number of the radial magnetic rods is 6; the length of the discharge chamber is 6X 9mm, and the section of the discharge chamber is 6X 9mm.
Further, the number of the tangential magnetic rods is 6; the length of the tangential magnetic rod 6 is the length of the discharge chamber and its cross section is 8 x 9mm.
Further, the number of the 6 radial magnetic bar magnets is N38, and the residual magnetic quantity is 1.25T; the magnetizing direction of the radial magnetic bars is along the radial direction, and the polarities of adjacent radial magnetic bars are opposite; the maximum field strength of the multi-peak cusp magnetic field on the wall of the discharge chamber reaches about 1860 Gs.
Further, the number of the 6 tangential bar magnets is N35, and the residual magnetic quantity is 1.21T; the magnetizing direction of the radial magnetic bars is along the circumferential direction, and the polarities of the adjacent tangential magnetic bars are opposite; by adding tangential magnets, the maximum field strength on the wall of the discharge chamber reaches around 2580 Gs.
Further, the radial distance between the cartridge clip device and the injection magnetic ring, the middle magnetic ring and the extraction magnetic ring is 4.5mm.
Advantageous effects of the invention
1. 2.45GHzECR ion source is in a high density state, and the resonance magnetic field is only about 875Gs or 930Gs because the ion source belongs to a low-frequency ECR source, and considering the electron relativity effect and Doppler frequency movement to widen a resonance area, three permanent magnet rings generate an off-resonance field or a magnetic mirror field with a relatively high magnetic mirror ratio, and the confinement effect of the magnetic mirror field can be enhanced by using the magnetic mirror ratio as high as possible, thereby being beneficial to the generation of helium ions with a high charge state.
2. The 6 permanent magnet rods are adopted to provide a radial constraint field and the original axial magnetic field to form a 'minimum magnetic field structure', so that the composite magnetic field of the middle part is greatly enhanced, and the magnetic pressure of the middle part of the magnetic mirror is increased to achieve the aim of stabilizing plasma. Since the value of the resonance magnetic field itself is not very large, the strength of the radial confinement magnetic field is approximately 2000Gs according to the proportional relation of the previous research experience. By enhancing the magnetic confinement of the plasma, the helium plasma is limited in the middle of the discharge cavity to prevent the helium plasma from moving to the edge and colliding with the cavity wall, so that the loss of He 2+ ion beam current is reduced, the yield of He 2+ ions is improved, and the proportion of mixed beams occupied by He 2+ is increased.
Drawings
FIG. 1a is a cross-sectional view of a magnet system of an ECR ion source of the present invention generating high flux intensity He 2+ ions;
FIG. 1b is a side view of a magnet system of an ECR ion source of the present invention generating high flux intensity He 2+ ions;
Fig. 2 is a schematic diagram of the radial confinement magnetic field of the magnet system of the ECR ion source of the present invention producing high-current intensity He 2+ ions.
FIG. 3 is a schematic view of the present invention with radial and tangential magnets disposed in the cartridge holder back-up slot;
1: injecting a magnetic ring; 2: a cartridge clip device; 2-1: a standby groove; 3: a middle magnetic ring; 4: leading out a magnetic ring; 5: radial magnetic bars; 6: tangential magnetic bars.
Detailed Description
Principle of design of the invention
1. The innovation point of the invention is as follows: a radial tangential confinement magnet is added to a low-frequency ECR ion source that originally generates a single charge state, and a high-current-intensity He 2+ ion in a medium charge state is generated (the medium-high charge state refers to the number of positive charges of charged particles, and is called medium charge state ion when the number of positive charges is 2-6).
The first, present invention and conventional methods differ in that: the conventional method uses medium-high frequency ECR when generating ions in medium-high charge state, while the invention uses low frequency ECR ion source when generating He 2+ ions.
Second, the reason for using medium-high frequency ECR (the medium-high frequency ECR refers to ECR ion source more than 5 GHz) for generating medium-high charge state ions by the conventional method is that: the reason why the medium-high frequency ECR is used when the medium-high charge state ions are generated is that a plurality of collisions are required to change the ions into ions with a plurality of positive charges, and a strong confining magnetic field is required to ensure the stable presence of the medium-high charge state ions. The strong confining magnetic field requires an axial magnetic field, i.e., a resonant magnetic field, which is not as strong as the magnetic field of the 2.45GHzECR ion source of the present embodiment is only 1000 gauss, which may be on the order of thousands of gauss. Firstly, the axial resonance magnetic field is strong, and if radial constraint magnets are added, the strength of the constraint magnets can reach about one-dot multiple tesla. The medium-high charge state is generated by such a very strong magnetic field. Conclusion: in conventional methods, the flux is sacrificed to the pursuit of the medium-high charge state, and a great deal of effort is required above the magnetic field to generate such intense medium-high charge state ions. According to the related formula, the magnetic field is related to the frequency of the fed microwave, and the magnetic field strength requires that the frequency of the fed microwave is also high, so that the conventional method uses a medium-high frequency ECR source when generating ions in a medium-high charge state.
Thirdly, the invention combines the benefits of both (improving the yield of He 2+ and reducing the economic cost) and finds the optimal combination point. Since the change from He + to He 2+ does not require the generation of an extremely strong radial confinement magnetic field, the confinement magnetic field can be established fully by taking advantage of the low resonant magnetic field required for a 2.45GHzECR ion source and the structural features of a 2.45GHzECR ion source. Because the required resonance magnetic field of the 2.45GHzECR ion source is low, the radial constraint field matched with the ion source is relatively low, which means that the space occupied by the establishment of the constraint magnetic field on the 2.45GHzECR ion source is small, and the first available characteristic of the low-frequency 2.45GHzECR ion source; because the cartridge clip device 2 of the 2.45GHzECR ion source reserves the spare groove 2-1 along the circumferential direction, and because the space occupied by the required radial constraint magnetic field is relatively small, a magnet array structure consisting of a plurality of permanent magnets is not needed like the conventional method, the constraint magnetic field can be completely established by utilizing the space of the existing spare groove 2-1, and the characteristic that the low-frequency 2.45GHzECR ion source can be utilized for the second time.
2. The design principle of the confining magnetic field: the first difficulty in the design of the confinement magnetic field is that the confinement range of the confinement magnetic field is required, unlike the conventional multi-peak field confinement magnetic field, which has no requirement for limiting the size of the confinement field in principle, the confinement field is limited within the resonance region, and the confinement field is almost equal to the resonance region. When radial constraint is not applied, the diameter of the resonance area accounts for about 80% of the diameter of the whole discharge chamber, the application limits the action area of the constraint magnetic field to be approximately matched with the resonance area, and experiments prove that when the control area of the constraint magnetic field is matched with the resonance area, the yield of He 2+ ions can be improved from tens of microamps to hundreds of microamps. Secondly, to meet the design requirement of the confining magnetic field, six aspects of coordination are needed: the number, length, cross-sectional area of the radial magnetic bars 5 and the number, length, cross-sectional area of the tangential magnetic bars 6; the combined effect of these six aspects is to control the range of the confining magnetic field to coincide with the resonance region. The detailed design of each dimension of the restraining field is shown in the first embodiment of the application.
Based on the principle, the invention relates to a magnet system of an ECR ion source for generating high-current-intensity He 2+ ions, which is characterized in that a constraint magnetic field formed by alternately arranging a radial magnetic field and a tangential magnetic field is increased by utilizing the structural space of the original 2.45GHzECR ion source as shown in fig. 1, 2 and 3, and the invention is characterized in that: the restraining region formed by the restraining magnetic field is approximately equal to the resonance region of He 2+ ions generated in the middle of the discharge cavity, and the He + ions and electrons are restrained in the resonance region in the middle of the discharge cavity by the restraining magnetic field, so that the proportion of the He 2+ ions in the mixed beam in the resonance region is improved;
Further, the structural space of the original 2.45GHzECR ion source is as follows: arranged axially from one end to the other: an injection magnetic ring 1, a middle magnetic ring 3 and a leading-out magnetic ring 4; arranged from inside to outside along the radial direction: a discharge cavity, a cartridge clip device 2 and a middle magnetic ring 3; two sides of the discharge cavity are provided with an injection magnetic ring 1 and a leading-out magnetic ring 4; the cartridge clip device 2 is sleeved with a middle magnetic ring 3 and a discharge cavity; the inner diameters and the outer diameters of the injection magnetic ring 1, the middle magnetic ring 3 and the extraction magnetic ring 4 are the same.
Further, the restraining magnetic field is composed of a plurality of radial magnetic rods 5 which are circumferentially and uniformly distributed on the spare groove 2-1 of the cartridge clip device 2, the length and the area of the cuboid of the radial magnetic rods 5, the residual magnetic quantity of the radial magnetic rods, a plurality of tangential magnetic rods 6 which are circumferentially and uniformly distributed on the spare groove 2-1 of the cartridge clip device 2, the length and the area of the cuboid of the tangential magnetic rods 6 and the residual magnetic quantity of the tangential magnetic rods 6.
Further, the number of the radial magnetic rods 5 is 6; the length of the discharge chamber is 6X 9mm, and the section of the discharge chamber is 6X 9mm.
Further, the number of the tangential magnetic rods 6 is 6; the length of the tangential magnetic rod 6 is the length of the discharge chamber and its cross section is 8 x 9mm.
Further, the number of the 6 radial magnetic bars 5 is N38, and the residual magnetic quantity is 1.25T; the magnetizing direction of the radial magnetic bars is along the radial direction, and the polarities of the adjacent radial magnetic bars 5 are opposite; the maximum field strength of the multi-peak cusp magnetic field on the wall of the discharge chamber reaches about 1860 Gs.
Further, the number of the 6 tangential magnetic bars 6 magnets is N35, and the residual magnetic quantity is 1.21T; the magnetizing direction of the radial magnetic bars 5 is along the circumferential direction, and the polarities of the adjacent tangential magnetic bars 6 are opposite; by adding tangential magnets, the maximum field strength on the wall of the discharge chamber reaches around 2580 Gs.
Further, the distance between the cartridge clip device 2 and the injection magnetic ring 1, the middle magnetic ring 3 and the extraction magnetic ring 4 is 5mm.
Supplementary explanation:
As shown in fig. 1, in the left side elevation view, the injection magnetic ring 1 and the extraction magnetic ring 4 are respectively positioned at two sides of the discharge cavity, and the inner diameters and the outer diameters of the three magnetic rings are the same and are respectively 40mm and 55mm. In ECR sources, since the hexapole permanent magnet is often placed within the axial coils and yokes, the outer diameter of the hexapole permanent magnet must be defined in order not to sacrifice the axial magnetic field. In addition, the size of the permanent magnet rod is determined on the premise of determining the diameter of the discharge chamber. The advantages of compact structure and low required resonance magnetic field of the 2.45GHzECR ion source are utilized, and an extremely strong radial constraint magnetic field is not required to be generated, so that a magnet array structure consisting of a plurality of permanent magnets is not required, the design requirement of the multimodal cusp field can be met only by 6 permanent magnet rods with small size, the size of the permanent magnet rods is 6 multiplied by 9mm, and the length of the permanent magnet rods is equal to the length of a discharge chamber. The permanent magnet rod is closely attached to the cooling circulation part of the discharge cavity and is fixed by the cartridge clip device 2, the cartridge clip device 2 is sleeved in the middle magnetic ring 3, and the concentric circles of the middle magnetic ring 3 can be seen from the right side plan view.
As shown in fig. 2, a top view of a radially constrained multi-modal field magnet 5 of the magnet system of the ECR ion source of the present invention producing high current intensity He 2+ ions: the permanent magnet rod is closely attached to the discharge chamber. Wherein a is a radial magnet, the polarity points to the radial direction of the circumference, and a multi-peak cusp field is provided; b is a tangential magnet, the polarity of which points in the tangential direction of the circumference, providing a tangential magnetic field.
In the 2.45GHzECR ion source with the full permanent magnet structure, the field strength of the exciting magnetic field is weak (at most one thousand gauss), so that the magnetic field of the adopted constraint magnet is not required to be too strong (two thousand gauss can meet the requirement). The generated plasmas are limited to the center of the discharge chamber by utilizing radial magnetic confinement, so that ion losses caused by collision between the plasmas and the wall of the discharge chamber are avoided.
Embodiment one: calculation of various dimensions of the confining magnetic field
1. The first step: the length, height, and radial distance from the magnet ring of the confinement magnets (radial bars 5, tangential bars 6) are determined. According to the size of the discharge cavity and the inner diameter of the magnetic ring, the radial distance between the constraint magnet and the magnetic ring is ensured to be 4.5mm, so that the height of the section of the radial magnetic rod 5 is determined to be 9mm, and the length of the magnetic rod is equal to the length of the discharge cavity.
2. And a second step of: the cross-sectional dimensions of the radial magnetic rod 5 are determined. In the case that the tangential magnet is not added, the height of the section of the radial magnetic rod 5 is 9mm, and the magnetizing quantity is 1.21T, the maximum field intensity of the inner wall of the discharge chamber corresponding to the different widths of the section of the radial magnetic rod 5 is shown in Table 1
TABLE 1
| Radial magnetic rod cross-sectional dimension/mm | Maximum field strength/Gs of inner wall of discharge chamber |
| 4×9 | 1330 |
| 5×9 | 1590 |
| 6×9 | 1790 |
| 7×9 | 1970 |
The magnetic rod cross-sectional size at 1790 of maximum field strength/Gs of the inner wall of the discharge chamber is selected, and is 6X 9mm, and the generated magnetic field strength is more approximate to twice the resonance field strength (1750 Gs).
3. And a third step of: the magnetizing quantity of the radial magnetic rod 5 is determined. Under the condition that the sectional size is selected to be 6 multiplied by 9mm and the radial magnetic rods 5 are adopted, the maximum field intensity of the inner wall of the discharge chamber corresponding to the radial magnetic rods 5 with different magnetizing amounts is shown in the table 2
TABLE 2
| Magnetizing quantity/T of radial magnetic rod | Maximum field strength/Gs of inner wall of discharge chamber |
| 1.21 | 1790 |
| 1.25 | 1860 |
| 1.28 | 2080 |
| 1.31 | 2140 |
As can be seen from table 2, the field strengths generated by the radial magnetic rods 5 with four different magnetizing amounts are all larger than twice the resonance magnetic field, and in order to facilitate adding the radial magnetic rods 5 with different magnetizing amounts to adjust the maximum field strength of the inner wall of the discharge chamber, the magnetizing amount is selected to be 1.25T in consideration of compromise.
4. Fourth step: the cross-sectional dimensions of the tangential magnet are determined. Under the condition that the radial magnetic rod 5 with the cross section size of 6 multiplied by 9mm and the magnetizing quantity of 1.25T are selected, under the condition that the magnetizing quantity of the tangential magnet is 1.21T, the maximum field intensity of the inner wall of the discharge chamber corresponding to the tangential magnet with different cross section widths is added, and the maximum field intensity is shown in the table 3
TABLE 3 Table 3
Considering that the maximum field intensity of the inner wall of the discharge chamber reaches 2580Gs after the tangential magnet with the size of 8 multiplied by 9mm is added, the magnetic field intensity is closer to the resonance magnetic field (2625 Gs) with the three times of the magnetic field intensity, and the adjustment of the magnetic field intensity is convenient, and the tangential magnet with the size of 8 multiplied by 9mm is selected.
5. Explanation of the number of radial magnetic bars 5, tangential magnetic bars 6: previous studies have shown that the greater the number of multi-modal field poles, the greater the magnetic confinement capability, but similarly, the greater the frequency of electron escape from the loss cone of the mirror, so comprehensive consideration is required to select the optimal number of poles. The quadrupolar field with superimposed mirror fields has only a very thin depletion line at both ends, which makes extraction of ions difficult. Therefore, in most modern ECR sources with a composite magnetic field structure formed by superposition of an axial field and a radial field, six-pole field configuration is preferred, the number of the radial magnetic bars 5 selected at this time is 6, and the number of tangential magnetic bars 6 matched with the six-pole field configuration is also 6.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
Claims (8)
1. A magnet system of ECR ion source for generating high-current strong He 2+ ions, the system utilizes the structural space of original 2.45GHzECR ion source, and increases the confining magnetic field composed of radial magnetic field and tangential magnetic field alternately, the magnet system is characterized in that: the confining area formed by the confining magnetic field is approximately equal to the resonance area of helium di-positive ions generated in the middle of the discharge cavity, helium + particles and electrons are confined in the resonance area in the middle of the discharge cavity by the confining magnetic field, and the proportion of helium di-positive ions in the mixed beam in the resonance area is improved.
2. A magnet system for an ECR ion source that produces high flux intensity He 2+ ions as defined in claim 1, wherein: the structural space of the original 2.45GHzECR ion source is as follows: arranged axially from one end to the other: an injection magnetic ring (1), a middle magnetic ring (3) and an extraction magnetic ring (4); arranged from inside to outside along the radial direction: a discharge cavity, a cartridge clip device (2) and a middle magnetic ring (3); two sides of the discharge cavity are provided with an injection magnetic ring (1) and a leading-out magnetic ring (4); the cartridge clip device (2) is sleeved with the middle magnetic ring (3) and sleeved with the discharge cavity; the inner diameter and the outer diameter of the injection magnetic ring (1), the middle magnetic ring (3) and the extraction magnetic ring (4) are the same.
3. A magnet system for an ECR ion source producing high flux intensity He 2+ ions as defined in claim 2, wherein: the restraining magnetic field consists of a plurality of radial magnetic bars, the lengths and the areas of the rectangular solids of the radial magnetic bars, the residual magnetic quantity of the radial magnetic bars which are circumferentially and uniformly distributed on the spare groove of the cartridge clip device (2), a plurality of tangential magnetic bars, the lengths and the areas of the rectangular solids of the tangential magnetic bars and the residual magnetic quantity of the tangential magnetic bars which are circumferentially and uniformly distributed on the spare groove of the cartridge clip device (2).
4. A magnet system of an ECR ion source producing high flux intensity He 2+ ions according to claim 3, wherein: the number of the radial magnetic rods is 6; the length of the discharge chamber is 6X 9mm, and the section of the discharge chamber is 6X 9mm.
5. A magnet system of an ECR ion source producing high flux intensity He 2+ ions according to claim 3, wherein: the number of the tangential magnetic rods is 6; the length of the tangential magnetic rod is the length of the discharge cavity, and the section of the tangential magnetic rod is 8 multiplied by 9mm.
6. A magnet system for an ECR ion source producing high flux intensity He 2+ ions as defined in claim 4 wherein: the number of the 6 radial magnetic bar magnets is N38, and the residual magnetic quantity is 1.25T; the magnetizing direction of the radial magnetic bars is along the radial direction, and the polarities of adjacent radial magnetic bars are opposite; the maximum field strength of the multi-peak cusp magnetic field on the wall of the discharge chamber reaches about 1860 Gs.
7. A magnet system for an ECR ion source producing high flux intensity He 2+ ions as defined in claim 5, wherein: the number of the 6 tangential magnetic bars is N35, and the residual magnetic quantity is 1.21T; the magnetizing direction of the radial magnetic bars is along the circumferential direction, and the polarities of the adjacent tangential magnetic bars are opposite; by adding tangential magnets, the maximum field strength on the wall of the discharge chamber reaches around 2580 Gs.
8. A magnet system for an ECR ion source producing high flux intensity He 2+ ions as defined in claim 2, wherein: the distance between the cartridge clip device (2) and the injection magnetic ring (1), the middle magnetic ring (3) and the extraction magnetic ring (4) is 4.5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410730532.4A CN118591073A (en) | 2024-06-06 | 2024-06-06 | Generating high-current-strength He2+Magnet system for ECR ion source of ions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410730532.4A CN118591073A (en) | 2024-06-06 | 2024-06-06 | Generating high-current-strength He2+Magnet system for ECR ion source of ions |
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| CN118591073A true CN118591073A (en) | 2024-09-03 |
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| CN202410730532.4A Pending CN118591073A (en) | 2024-06-06 | 2024-06-06 | Generating high-current-strength He2+Magnet system for ECR ion source of ions |
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