CN2354308Y - Strong-flow vacuum insulated serial accelerator - Google Patents
Strong-flow vacuum insulated serial accelerator Download PDFInfo
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- CN2354308Y CN2354308Y CN 98214853 CN98214853U CN2354308Y CN 2354308 Y CN2354308 Y CN 2354308Y CN 98214853 CN98214853 CN 98214853 CN 98214853 U CN98214853 U CN 98214853U CN 2354308 Y CN2354308 Y CN 2354308Y
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Abstract
The utility model provides a strong-flow vacuum insulated serial accelerator, which comprises negative ion source, low energy transport lines, serial accelerating tubes, a high voltage power supply, a high voltage leading-in device, and high energy transport lines, wherein, the matching of the ion source and an accelerating tube uses the separate type, and the serial accelerating tubes comprise multiple cylindrical electrodes which are sheathed one by one. Accelerating holes are arranged along the beam axis line, and an accelerating slit is formed between each layer of the electrode. The periphery of a beam axis is not provided with insulated columns, and a lotus leaf type pipeline is used as a gas exchange target. The high voltage power supply is connected with each voltage grading electrode of the serial accelerating tubes via the insulated column and coaxial type high voltage lead-in lines. The high energy transport lines comprises the lines of boron neutron capture therapy, the lines of fast neutron therapy, the lines of short life isotope production, and the lines of energy stabilization. The utility model can realize three purposes.
Description
The utility model relates to the low energy high-current accelerator, especially is applicable to the high current vacuum insulation tandem accelerator of boron neutron capture therapy.
Boron neutron capture therapy (hereinafter to be referred as BNCT) is a kind ofly to have very much the radiation of development potentiality to control the cancer method.But up to now, the whole world does not also have the neutron source device of BNCT special use.Is current research focus with accelerator as the neutron source device of BNCT special use.In order to satisfy the needs of BNCT, requiring the proton beam energy is 1.9～2.5MeV, flows strong 10～20mA.Satisfying requirement like this and the most competitive accelerator is the high-pressure type accelerator.At present, the high-pressure type accelerator all is to adopt the insulated column accelerating tube.Because the secondary that disperse bundle and X ray cause makes the insulated column charging, punctures thereby bring out between intensifying ring; Simultaneously, the existence of insulated column has limited the raising of accelerating space vacuum degree again, and therefore, the accelerating gradient of this class accelerator is low, and is bulky, and the acceleration electric current is restricted.So far, the acceleration electric current of conventional tandem accelerator is generally hundred microampere orders.1994, G.Proudfoot et al. was at Nucl.Inst. ﹠amp; Meth., the notion of high current vacuum insulation tandem accelerator has been proposed in the article of delivering on the B89 (1994) 1 " A new design of a compact high current ion accelerator ", ion beam insulated column is on the way removed, with the insulation accelerated electrode of vacuum gap.Can obtain big conducting like this; And the factor of bringing out puncture has been eliminated in the cancellation of insulated column, thereby has improved vacuum degree and compressive resistance.But G.Proudfoot has only proposed notion, does not carry out specific design, does not more bring it into being.
The purpose of this utility model is to overcome the deficiencies in the prior art part, and a kind of feasible technical scheme of high current vacuum insulation tandem accelerator is provided.
To achieve these goals, the utility model has adopted following technical scheme:
A kind of high current vacuum insulation tandem accelerator comprises anion source, tandem accelerating tube, high voltage source, high pressure introducing device, high energy transit; It is characterized in that: the coupling of ion source and accelerating tube adopts separate type, inserts a low energy transit between the two.
A kind of high current vacuum insulation tandem accelerator comprises anion source, tandem accelerating tube, high voltage source, high pressure introducing device, high energy transit; It is characterized in that: the tandem accelerating tube is nested one by one by a plurality of tubular electrodes and constitutes, the common center axle of tubular electrode and bundle axis normal, tubular electrode has on the axis along bundle and quickens the hole, forms accelerating gap between every layer of electrode, in accelerating gap without any additional insulator.
A kind of high current vacuum insulation tandem accelerator comprises anion source, tandem accelerating tube, high voltage source, high pressure introducing device, high energy transit; It is characterized in that: high voltage source links to each other with each electrode of tandem accelerating tube by the high pressure introducing device; The high pressure introducing device comprises high pressure lead-in and two high pressure introducing insulated columns; Each accelerating tube electrode is fixed on each voltage grading electrode of insulated column, the upper end of last insulated column is fixed on the accelerating tube electrode of innermost layer, the lower end of following insulated column is fixed on the high voltage source, and innermost layer accelerating tube electrode links to each other by a metal tube in the insulated column with high voltage source; Supply with the current potential of each voltage grading electrode of insulated column down by resitstance voltage divider, be " coaxial line " type by different big or small hollow edged electrodes then and link to each other, offer each accelerating electrode current potential with each voltage grading electrode of last insulated column.
A kind of high current vacuum insulation tandem accelerator comprises anion source, tandem accelerating tube, high voltage source, high pressure introducing device, high energy transit; It is characterized in that: wherein the high energy transit comprises one tunnel energy stabilization line; Take out the sub-fraction neutral beam in accelerator outlet and flow to into the energy stabilization line, behind carbon paper tinsel conversion proton, line focus and 90 ° of analyzing magnets are obtained the energy hunting signal, the current potential of FEEDBACK CONTROL Gas Exchange pipeline, make energy stability reach ± 0.1%.
The utility model provides the specific design of a practicable 2.5MeV, 20mA vacuum insulation tandem accelerator.Advantage of the present utility model, the one, reach high vacuum easily, the generation of favourable inhibition secondary electron, the 2nd, there is not insulator in the beam channel periphery, does not therefore exist offspring stream and X ray to bring out the insulator breakdown problem yet; The 3rd, compact conformation; The 4th, can reach tens milliamperes high current; The 5th, quality of beam is good, can reach higher energy stability; The 6th, energy is adjustable continuously, and ionic species is variable, can satisfy multi-functional requirement.
Below in conjunction with drawings and Examples the utility model is described in further detail.
Fig. 1 is the structural representation of the overall plan of the utility model high current vacuum insulation tandem accelerator;
Fig. 2 is the anion source 1 of high current vacuum insulation tandem accelerator shown in Figure 1 and the structural representation of low energy transmission line 6;
Fig. 3 is the anion source structure for amplifying schematic diagram of Figure 1 and Figure 2;
Fig. 4 is the structural representation of the Gas Exchange pipeline of high current vacuum insulation tandem accelerator shown in Figure 1;
Fig. 5 is the structural representation of the high energy transmission line of high current vacuum insulation tandem accelerator shown in Figure 1.
The high current vacuum insulation tandem accelerator basic structure of the utility model embodiment comprises anion source 1, tandem accelerating tube 2, high voltage source 3, high pressure introducing device 4, high energy transit 5 etc. as shown in Figure 1.
Embodiment one:
In the prior art, anion source normally adopts the space to produce the source.And in the present embodiment, having adopted cusp field caesium surface plasma source, this ion source has efficient height, little, the easy adjustment of gas consumption, advantage such as inexpensive.As shown in Figure 2, this ion source comprises arc chamber 101 and extraction system.Arc chamber 101 includes ion conversion surface 102 and negative electrode 103.Caesium steam and hydrogen are injected arc chamber 101, and the monoatomic layer dynamic membrane that caesium steam forms at ion conversion surface 102 places makes the hydrogen atom of reflection or desorb change negative hydrogen ion H into
-H
-Under quickening, conversion utmost point protheca layer voltage focuses on and direct outgoing fairlead.Extraction system is made up of the plasma utmost point 104, first extraction electrode 105 and accelerating electrode 106.The hydrogen of input arc chamber is replaced by deuterium gas D
2, can obtain negative deuterium ion D
-If ion conversion surface 102 to the distance of the plasma utmost point 104 is R, as shown in Figure 3.In the general design, R gets 8cm usually, and the plasma utmost point 104 fairleads adopt straight hole usually.H by the conversion surface outgoing
-, to the fairlead road owing to losing with the very easy desorb of the various particle encounters of plasma, so the electric current I at outlet place exponential decay with the increase of distance R.Can prove that the reducing of R will make the brightness of ion source ejected beam increase.In the present embodiment, R gets 4cm; And, adopting the plasma utmost point fairlead of being with upper cut 107 and lower cut 108, upper cut 107 allows to carry more line, and lower cut 108 makes restraints into the parallel beam outgoing.
In the prior art, ion source and accelerating tube are directly coupling, and like this, a large amount of gases and foreign ion can flow into accelerating tube from ion source, are difficult to the high vacuum in the assurance accelerating tube, and coupling is adjusted difficulty between ion source and accelerating tube.In the present embodiment, ion source 1 adopts separate type with the coupling of accelerating tube 2, inserts a low energy transit 6 between the two, as Fig. 1, is easy to adjust optical match between the two like this, realizes both vacuum insulation, and may adopt the caesium surface plasma source.Low energy transit 6 is made up of vacuum chamber 601, deflecting magnet 602 and concentrating element 603.In order to reduce cost, concentrating element 603 has adopted two static unipotential lenses, as shown in Figure 2, through optimal design, adopts the little geometry of aberration; The target of unipotential lens 603 is made four, but double as line centering is proofreaied and correct.The effect of deflecting magnet 602 is: remove a small amount of negative oxygen ion that may exist partially; Reduce the probability that caesium steam directly escapes into accelerating tube 2; The electron stream of drawing by ion source that goes partially to exist.In order to make line pass through basic retainer shaft symmetry behind the deflecting magnet, adopt the less deflecting magnet of deflection angle and the non-perpendicular incidence angle and the angle of emergence.In the present embodiment, the deflection angle of deflecting magnet is 30 °, and incidence angle β i is 10.52 °, and angle of emergence β o is 10.73 °, and radius of curvature ρ is 10cm, and the magnet air gap is 2cm.Like this, the parallel beam of drawing from ion source 1 flows by basic retainer shaft symmetry after 30 ° of deflecting magnets 602, form with a tight waistly at 9cm place between two static unipotential lenses 603 and before the inlet at accelerating tube, enter accelerating tube 2 with about 0.17rad half diffusing angle then.In addition, it is two vacuum chambers that vacuum chamber 601 central authorities separate with aperture 604, bleeds with two pumps respectively.Can take the gas that flows into from ion source so in a large number away, and with the caesium vapour condensation in the chamber, initial vacuum, do not flow into accelerating tube.
Embodiment two:
As Fig. 1, accelerating tube 2 is that six diameters are descending, is nested one by one, has the tubular stainless steel electrode of common central shaft 7.This axially symmetric structure, convenient processing and installation are adjusted.The upper cover plate 201 of electrode is plane disc.The lower end of electrode is fixed on the high pressure introducing device 4.Have the hole of passing through for line 202 on electrode sidewall, beam axis 8 is vertical with cylinder type electrode axis 7.Form accelerating field 204,205 between the hole of adjacent electrode, in the present embodiment, quickening progression is six grades.In accelerating gap,, can obtain big admittance like this, help gas clean-up and compressive resistance, and reduce hydrionic gas stripping without any additional insulator.In the present embodiment, the height 1.5m of accelerator, the about 116cm of outermost electrode diameter, the about 45cm of inside diameter, each screening electrode size design principle is that the high field intensity in the most inboard high pressure gap is 30kV/cm, the high field intensity in all the other each gaps is 40kV/cm.Average gas pressure P≤7.5 * 10 in the accelerating tube
-6Torr.
Be provided with Gas Exchange pipeline 203 in the high-field electrode of innermost layer, inflated with nitrogen is made the Gas Exchange target in the pipeline.In the present embodiment, the long 30cm of pipeline, diameter 1.0cm, average gas pressure P=1.8 * 10 of nitrogen in the pipe
-2Torr.In the conventional design, Gas Exchange pipeline 203 is a clear opening, and in the present embodiment, employing dish lotus leaf slice structure is as Fig. 4.This structure reduces half approximately with the gas consumption amount.Target gas is by on the disk cover plate 201 on each electrode and two side through hole, through top and the both sides diffusion pump take away.Avoid the use value costliness like this, the condenser pump of technical sophistication.
Embodiment three:
Referring to Fig. 1, high voltage source 3 is below accelerating tube 2.The design has adopted insulating transformer type high voltage source under the hyperbar, has compact conformation, advantage such as reliable and stable, inexpensive.Rating operating voltage 1.25MV, 50mA.Unloaded experienced voltage is up to 1.75MV.Its hyperbar steel cylinder 301 diameter 1.5m; Height 2.65m.Elementary winding 302 has 30 circles, is encouraged through capacitive coupling by the 400Hz intermediate frequency generator.Secondary 303 are made up of the stack of 40 windings and rectification section.Each secondary winding is by 3300 circle coil windings, and uses curable epoxide.Through extraordinarily circuit and 10000Pf capacitor filtering, produce the 40KV high direct voltage.The secondary coil overcoat is with oval stainless steel shielding ring.The about 454Pf of loop total capacitance.
Upper end accelerating tube 2 and lower end high voltage source 3 are linked to each other by coaxial type high pressure introducing device 4.Coaxial type high pressure introducing device 4 comprises high pressure lead-in 401,404 and high pressure introducing insulated column 402,403.Insulated column internal diameter 360mm, external diameter 400mm.High pressure is introduced insulated column and is divided into two parts up and down.For High-Voltage Insulation gas, be outward high vacuum in the last insulated column 402, choose field intensity 17kV/cm, its highly about 80cm.All be in the hyperbar insulating gas inside and outside the following insulated column 403, choose field intensity 40kV/cm, its highly about 34cm.Because insulated column inside is in hyperbar, so dielectric strength is very high.Interior and the bottom surface outermost layer electrode is a plane disc, is separately fixed at the top and bottom of insulated column 402.The lower end of following insulated column 403 is fixed on the high voltage source 3.It is the coaxial pipe 404 that reduces one by one at the insulated column inside diameter that each current potential is introduced electrode, and the last lower limb of pipe turns up, about being fixed on each electrode of insulated column.Central authorities are stainless pipes 401, and two ends link to each other with high voltage source 3 with the bottom surface of the electrode of innermost layer respectively.These circular tube structures form coaxial high pressure lead-in, choose field intensity 100kV/cm, and then it is of a size of φ 36, and φ 113.5, and φ 163.4, and φ 210.4, and φ 256, and φ 300.1, φ 345.2mm.Supply with the current potential of insulated column 403 each voltage grading electrode down by resitstance voltage divider, the pipe electrode 404 by different-diameter is " coaxial line " type and links to each other with last insulated column 402 each voltage grading electrode then, offers each accelerating electrode current potential, and each gap voltage is 204KV.
Embodiment four:
Line accelerates to 1.275MeV through preacceleration field 204, and 203 central authorities become waist in the Gas Exchange chamber.Behind Gas Exchange chamber 203, the H more than 95%
+Ion is converted into H
-Ion.After post acceleration field 205 accelerates to 2.50MeV, drawn again, entered high energy transmission system 5 from accelerator.
As shown in Figure 5, in the present embodiment, high energy transmission line 5 is divided into three tunnel of level by horizontal deflection magnet 501, is used separately as energy stabilization line 502, fast neutron therapy line 503 and short-lived isotope production line 504.On fast neutron therapy transmission line 503, be provided with a vertical deflection magnet 505, line is deflected down, as BNCT treatment line 506.Realize the purpose of hospital's one device, three usefulness.
Neutral beam flows to into straight-through energy stabilization line 502.Put carbon paper tinsel 507 on the energy stabilization line, through the carbon paper tinsel neutral hydrogen atom of Gas Exchange pipeline 203 conversion remaining 5% is converted to proton, behind line focus and the 90 ° of analyzing magnets 508, obtains the energy hunting signal, the current potential of FEEDBACK CONTROL Gas Exchange pipeline 203, make energy stability reach ± 0.1%.The analyzer electric current is done the high accuracy energy measurement behind online nuclear reaction threshold scale.
Index of this device and ionic species can change within the specific limits; except that BNCT; also can be used for purposes such as isotope production, fast neutron therapy, PIXE analysis, fast neutron activation analysis, customs's explosive and drugs detection, high current ion implantor, include in protection scope of the present invention.
Claims (11)
1. a high current vacuum insulation tandem accelerator comprises anion source (1), tandem accelerating tube (2), high voltage source (3), high pressure introducing device (4), high energy transit (5); It is characterized in that: ion source (1) adopts separate type with the coupling of accelerating tube (2), inserts a low energy transit (6) between the two.
2. high current vacuum insulation tandem accelerator according to claim 1 is characterized in that: described low energy transit (6) is made up of vacuum chamber (601), deflecting magnet (602) and concentrating element (603); Deflecting magnet has the non-perpendicular incidence angle and the angle of emergence.
3. high current vacuum insulation tandem accelerator according to claim 1 is characterized in that: described anion source is the caesium surface plasma source.
4. high current vacuum insulation tandem accelerator according to claim 3 is characterized in that: the ion conversion surface (102) of described caesium surface plasma source to the distance of the plasma utmost point (104) is 4cm.
5. high current vacuum insulation tandem accelerator according to claim 4 is characterized in that: the fairlead of the plasma utmost point (104) of described caesium surface plasma source has upper cut (107) and lower cut (108).
6. a high current vacuum insulation tandem accelerator comprises anion source (1), tandem accelerating tube (2), high voltage source (3), high pressure introducing device (4), high energy transit (5); It is characterized in that: tandem accelerating tube (2) is nested one by one by a plurality of tubular electrodes and constitutes, the common center axle (7) of tubular electrode is vertical with bundle axis (8), tubular electrode quickens hole (202) along having on the bundle axis (8), form accelerating gap (204 between every layer of electrode, 205), in accelerating gap without any additional insulator.
7. high current vacuum insulation tandem accelerator according to claim 6 is characterized in that: be provided with Gas Exchange pipeline (203), Gas Exchange pipeline (203) employing dish lotus leaf slice structure in the high-field electrode of the innermost layer of described tandem accelerating tube (2).
8. a high current vacuum insulation tandem accelerator comprises anion source (1), tandem accelerating tube (2), high voltage source (3), high pressure introducing device (4), high energy transit (5); It is characterized in that: high voltage source (3) links to each other with each electrode of tandem accelerating tube (2) by high pressure introducing device (4); High pressure introducing device (4) comprises high pressure lead-in (401,404) and two high pressure introducing insulated columns (402,403); Each accelerating tube electrode (2) is fixed on each voltage grading electrode of insulated column (402), the upper end of last insulated column (402) is fixed on the accelerating tube electrode of innermost layer, the lower end of following insulated column (403) is fixed on the high voltage source (3), and innermost layer accelerating tube electrode links to each other by the metal tube (401) in the insulated column with high voltage source (3); Supply with the current potential of each voltage grading electrode of insulated column (403) down by resitstance voltage divider, be " coaxial line " type by different big or small hollow edged electrodes (404) then and link to each other, offer each accelerating electrode current potential with each voltage grading electrode of last insulated column (402).
9. high current vacuum insulation tandem accelerator according to claim 8 is characterized in that: described high voltage source (3) is an insulating transformer type high voltage source.
10. a high current vacuum insulation tandem accelerator comprises anion source (1), tandem accelerating tube (2), high voltage source (3), high pressure introducing device (4), high energy transit (5); It is characterized in that: wherein high energy transit (5) comprises one tunnel energy stabilization line (502); Taking out the sub-fraction neutral beam in the accelerator outlet flows to into energy stabilization line (502), behind carbon paper tinsel (507) conversion proton, line focus and 90 ° of analyzing magnets (508) are obtained the energy hunting signal, the current potential of FEEDBACK CONTROL Gas Exchange pipeline (203), make energy stability reach ± 0.1%.
11. high current vacuum insulation tandem accelerator according to claim 10 is characterized in that: comprise also on the described high energy transmission line that make BNCT line (506) at three the tunnel: the one tunnel; One the tunnel makes fast neutron therapy line (503); Make short-lived isotope production line (504) on the way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98214853 CN2354308Y (en) | 1998-05-18 | 1998-05-18 | Strong-flow vacuum insulated serial accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98214853 CN2354308Y (en) | 1998-05-18 | 1998-05-18 | Strong-flow vacuum insulated serial accelerator |
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|---|---|
| CN2354308Y true CN2354308Y (en) | 1999-12-15 |
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| CN 98214853 Expired - Fee Related CN2354308Y (en) | 1998-05-18 | 1998-05-18 | Strong-flow vacuum insulated serial accelerator |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100591191C (en) * | 2006-07-21 | 2010-02-17 | 中国工程物理研究院环保工程研究中心 | High-voltage connection device for electron accelerator |
| CN102340922A (en) * | 2011-08-09 | 2012-02-01 | 湖北久瑞核技术股份有限公司 | Electron accelerator |
| CN103222345A (en) * | 2010-02-24 | 2013-07-24 | 西门子公司 | Accelerator for charged particles |
| CN103299720A (en) * | 2010-12-08 | 2013-09-11 | Gtat公司 | A d.c. charged particle accelerator, a method of accelerating charged particles using d.c. voltages and a high voltage power supply apparatus for use therewith |
| CN104378904A (en) * | 2014-11-20 | 2015-02-25 | 大连理工大学 | Radio frequency plasma chamber meeting mechanism that negative hydrogen ions are generated through plasmas |
| CN110223796A (en) * | 2019-06-10 | 2019-09-10 | 中国科学院近代物理研究所 | A kind of Isotope production equipment |
| CN111681938A (en) * | 2020-06-09 | 2020-09-18 | 中国科学院合肥物质科学研究院 | Device and method for high-energy hydrogen ion implantation |
| CN112056010A (en) * | 2018-04-30 | 2020-12-08 | 中子医疗股份有限公司 | Compact motor-driven insulated electrostatic particle accelerator |
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-
1998
- 1998-05-18 CN CN 98214853 patent/CN2354308Y/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100591191C (en) * | 2006-07-21 | 2010-02-17 | 中国工程物理研究院环保工程研究中心 | High-voltage connection device for electron accelerator |
| CN103222345B (en) * | 2010-02-24 | 2016-05-04 | 西门子公司 | The accelerator of charged particle |
| CN103222345A (en) * | 2010-02-24 | 2013-07-24 | 西门子公司 | Accelerator for charged particles |
| CN103299720A (en) * | 2010-12-08 | 2013-09-11 | Gtat公司 | A d.c. charged particle accelerator, a method of accelerating charged particles using d.c. voltages and a high voltage power supply apparatus for use therewith |
| CN103299720B (en) * | 2010-12-08 | 2016-02-10 | Gtat公司 | Direct current charged particle accelerator, utilize the method for direct voltage accelerating charged particles and the high-voltage power apparatus for therewith using |
| CN102340922A (en) * | 2011-08-09 | 2012-02-01 | 湖北久瑞核技术股份有限公司 | Electron accelerator |
| CN104378904A (en) * | 2014-11-20 | 2015-02-25 | 大连理工大学 | Radio frequency plasma chamber meeting mechanism that negative hydrogen ions are generated through plasmas |
| CN104378904B (en) * | 2014-11-20 | 2017-01-18 | 大连理工大学 | Radio frequency plasma chamber meeting mechanism that negative hydrogen ions are generated through plasmas |
| CN112056010A (en) * | 2018-04-30 | 2020-12-08 | 中子医疗股份有限公司 | Compact motor-driven insulated electrostatic particle accelerator |
| US11968774B2 (en) | 2018-04-30 | 2024-04-23 | Neutron Therapeutics Llc | Compact motor-driven insulated electrostatic particle accelerator |
| CN112056010B (en) * | 2018-04-30 | 2024-05-17 | 中子医疗股份有限公司 | Compact motor-driven insulated electrostatic particle accelerator |
| CN110223796A (en) * | 2019-06-10 | 2019-09-10 | 中国科学院近代物理研究所 | A kind of Isotope production equipment |
| CN111681938A (en) * | 2020-06-09 | 2020-09-18 | 中国科学院合肥物质科学研究院 | Device and method for high-energy hydrogen ion implantation |
| CN116634649A (en) * | 2023-05-30 | 2023-08-22 | 迈胜医疗设备有限公司 | Accelerator cavity aging device and method, electronic equipment and related device |
| CN116634649B (en) * | 2023-05-30 | 2024-01-26 | 迈胜医疗设备有限公司 | Accelerator cavity aging device and method, electronic equipment and related device |
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