CN102202457A - Dielectric wall accelerator - Google Patents
Dielectric wall accelerator Download PDFInfo
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- CN102202457A CN102202457A CN 201010133723 CN201010133723A CN102202457A CN 102202457 A CN102202457 A CN 102202457A CN 201010133723 CN201010133723 CN 201010133723 CN 201010133723 A CN201010133723 A CN 201010133723A CN 102202457 A CN102202457 A CN 102202457A
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Abstract
The invention discloses a dielectric wall accelerator with strong accelerating beam current and high accelerating gradient. The dielectric wall accelerator comprises a sealed barrel and a dielectric beam pipeline in the middle of the barrel; an accelerating pulse forming device of an accelerating unit comprises dielectric flat plates, metal electrodes arranged on each dielectric flat plate, a high-voltage input end and a photoconductive switch, wherein each accelerating unit comprises at least two layers of accelerating pulse forming devices; each layer comprises two accelerating pulse forming devices which are symmetrically arranged outside the dielectric beam pipeline; and the magnetic fields generated along the bending directions of the metal electrodes arranged on the dielectric flat plates in the two symmetrical accelerating pulse forming devices have the same size and are opposite to each other. The accelerating pulse forming device makes the magnetic fields generated by a pulse current counteract each other in the center of the dielectric beam pipeline, while the generated electrical fields cooperate with each other, so that charged particles in the pipeline are accelerated and the defect that the magnetic fields generated by the pulse current interfere with each other in an adjacent layer to cause the pulse distortion is overcome; and the dielectric wall accelerator has the advantages of strong accelerating beam current, high accelerating gradient, simple structure and low cost.
Description
Technical field
The present invention is a kind of high current particle accelerator, and particularly accelerated current is strong, the dielectric wall accelerator that accelerating gradient is high.
Background technology
Accelerator art has had significant progress through hundred years of development.The accelerator of various structures is being brought into play crucial effect in fields such as the national economic development, scientific research, health care, national defense construction.But present accelerator all has its weak point, and perhaps beam intensity is little, and perhaps accelerating gradient is low, perhaps involves great expense, and is billions of easily even tens billion of yuans.
The dielectric wall accelerator is a kind of novel high gradient, the high-current accelerator notion that proposes in recent years, compare with traditional accelerator, the characteristic that many excellences are arranged, be used to glisten that radiograph, proton are taken a picture, subcritical nuclear power station driving and nuclear waste disposal and conversion, heavy particle (proton, C
12 (+5)Ion) the desirable accelerator used of field such as treatment cancer etc.
For sort accelerator being become engineering reality, the scholar of many countries has carried out a large amount of research work, has also proposed some embodiments.Particularly form aspect the device, how to form high gradient, high current quickens, reduce aspect such as accelerator volume and done big quantity research in acceleration pulse.These schemes are concluded three kinds, and they respectively have characteristics, also all have limitation, even have the difficulty that is difficult to overcome.
First kind of scheme be the flat linear structure as.Be the present scheme of studying of U.S.'s livermore national laboratory (referring to Caporaso G J, et.al, LLNL-Conf-412562)., media cylinders is made the pipeline of accelerated particle beam, and the particle beams is here quickened by the pulse voltage that the outer pulse forming line of pipe produces.Insert direct voltage during work, switch closure obtains the accelerating voltage pulse on media cylinders afterwards, is accelerated through the ion here along center line.A plurality of such structures are connected in series, and just constitute a dielectric wall accelerator.
The characteristics of this structure are simple, but exist major defect, are difficult to be applied in the actual accelerator.These defectives are:
1, multi-layer planar pulse forming line mutual superposition, when forming pulse, the magnetic field that pulse current forms can cause in adjacent layer interference causes pulse distortion.
2, practical a large amount of photoconductive switch not only involves great expense, and also makes accelerator operation difficult in maintenance.
Second kind of scheme be the open switch structure as (referring to Arntz F, at.al, SLAC-PUB-13477, Dec.2008).Critical component in this structure is a drift step recovery diode, and it is a kind of open switch, and conducting at ordinary times directly is not added on the medium pipe applied voltage.Externally under the driving of circuit, it becomes disconnection from conducting, and produces an accelerating voltage pulse that (2～5) ns is wide, accelerated particle beam.A plurality of such structure serial connections form the dielectric wall accelerator.
This structure has been avoided direct voltage directly is added to shortcoming on the medium pipe.But also introduced other problem simultaneously:
1, drift step recovery diode withstand voltage lower (≤2kV), make the high gradient accelerator with this device, can cause many structural difficulties.
2, drift step recovery diode drive circuit more complicated, the cost height.The accelerator manufacturing cost is significantly increased.
3, similar with first kind of scheme, there is the pulsed magnetic field cross-interference issue between the multilayer dielectricity plate.
Summary of the invention
The objective of the invention is to overcome existing dielectric wall and quicken weak point, provide a kind of magnetic field that overcomes pulse current formation can in adjacent layer, cause interference, cause the shortcoming of pulse distortion, and accelerated current is strong, accelerating gradient is high, simple in structure, dielectric wall accelerator that cost is lower.
Solution of the present invention is: a kind of dielectric wall accelerator, comprise sealed cylinder, medium beam tube road in the middle of the cylindrical shell, form the accelerated passage that connects in the middle of the medium beam tube road, the acceleration pulse of its each accelerator module forms device and comprises media plate, every media plate two sides is furnished with metal electrode, be furnished with high voltage input terminal in the middle of the media plate, high voltage input terminal and wherein be connected to photoconductive switch between the metal electrode, be characterized in that each accelerator module forms device by two-layer acceleration pulse at least and constitutes, each layer comprises that symmetrical two acceleration pulses that are positioned on outside the medium beam tube road form device, and the formed magnetic field of the metal electrode bending direction size that two symmetrical acceleration pulses form cloth on the device medium flat board is identical, direction is opposite.
In the solution of the present invention, comprise that symmetrical two acceleration pulses that are positioned on outside the medium beam tube road form device because acceleration pulse forms each layer of device, the formed magnetic field of the metal electrode bending direction size that two symmetrical acceleration pulses form cloth on the device medium flat board is identical, direction is opposite.Acceleration pulse forms the both sides that device is installed in medium beam tube road, the magnetic field that two assembly pulse currents are produced, cancel out each other at center, medium beam tube road, and the electric field acting in conjunction of its generation, quicken ducted charged particle, thereby overcome the folded mutually caused interlayer magnetic field of multilayer pulse forming line cross-interference issue.A plurality of accelerator module serial connections are exactly a dielectric wall accelerator.
In the solution of the present invention: it is identical with angle outside ground floor is positioned on medium beam tube road to make the symmetrical acceleration pulses of the second layer two form devices, metal electrode is identical with the formed magnetic direction of metal electrode on ground floor the right on the media plate on the second layer left side, metal electrode is identical with the formed magnetic direction of the metal electrode on the ground floor left side on the media plate on second layer the right, and the magnetic field size of metal electrode formation is identical on ground floor and the second layer media plate.Two-layer so formed direction of an electric field is identical, the formed magnetic field better effects if of cancelling out each other at center, medium beam tube road.
In the solution of the present invention: it is identical with the 4th layer of angle that is positioned on outside the medium beam tube road to make the 3rd layer of two symmetrical acceleration pulse form device, the 3rd layer with the 4th layer of relative ground floor and second layer half-twist, the 3rd layer with the 4th layer of media plate on metal electrode identical with ground floor with second layer structure.Assembly in the unit is installed on the four direction, and each direction has only two assemblies allo mutually, just have only six pulses extraordinarily line tightly be stacked together, overcome the folded mutually caused interlayer magnetic field of multilayer pulse forming line cross-interference issue.
In the solution of the present invention: the metal electrode of cloth is crooked on the media plate.Its purpose shortens the length of media plate, makes dielectric wall accelerator volume-diminished.
In the solution of the present invention: acceleration pulse forms device and comprises extraordinarily three functional sections of section of accelerating voltage pulse shaping part, matching section and pulse voltage, the curve form of metal electrode is on the media plate of three functional sections: the accelerating voltage pulse shaping partly is a straight line, smoothly turn to 180 degree backs to form the matching section straight line at accelerating voltage pulse shaping part tail end, smoothly turn to 180 degree backs to form extraordinarily section straight line of pulse voltage again at the matching section tail end.
Advantage of the present invention: form device because each layer of accelerator module comprises symmetrical two acceleration pulses that are positioned on outside the medium beam tube road, the formed magnetic field of the metal electrode bending direction size that two symmetrical acceleration pulses form cloth on the device medium flat board is identical, direction is opposite.Acceleration pulse forms the both sides that device is installed in medium beam tube road, the magnetic field that two assembly pulse currents are produced, cancel out each other at center, medium beam tube road, and the electric field acting in conjunction of its generation, quicken ducted charged particle, the magnetic field that overcomes pulse current formation can cause interference in adjacent layer, cause the shortcoming of pulse distortion.Accelerated current of the present invention is strong, accelerating gradient is high, simple in structure, cost is lower.
Description of drawings
Fig. 1 forms the apparatus structure schematic diagram for the acceleration pulse of the single accelerator module of the present invention;
Fig. 2 is Fig. 1 vertical view;
Fig. 3 is the metal electrode curved shape of the present invention schematic diagram of arranging.
Embodiment
The embodiment of the invention is as shown in Figure 1 and Figure 2: the acceleration pulse of single accelerator module forms device and is made up of four layers of media plate 1, every media plate 1 is coated with metal electrode 2 up and down, be furnished with high voltage input terminal in the middle of the media plate 1, high voltage input terminal and wherein be connected to photoconductive switch between the metal electrode 2 of a media plate 1, each layer comprises that symmetrical 3 two media plates, 1 device of being positioned on outside the medium beam tube road constitutes, and the formed magnetic field of the metal electrode 2 bending directions size of cloth is identical on the two symmetrical media plates 1, direction is opposite; The second layer two symmetrical media plates 1 are identical with 3 angle outside ground floor is positioned on medium beam tube road, metal electrode 2 is identical with the metal electrode 2 formed magnetic directions on ground floor the right on the media plate 1 on the second layer left side, metal electrode 2 is identical with the metal electrode 2 formed magnetic directions on the ground floor left side on the media plate 1 on second layer the right, and the magnetic field size of metal electrode 2 formation is identical on ground floor and the second layer media plate; The 3rd layer of two symmetrical media plate 1 with the 4th layer to be positioned on outside the medium beam tube road 3 angle identical, the 3rd layer with the 4th layer of relative ground floor and second layer half-twist, the 3rd layer with the 4th layer of media plate 1 on metal electrode 2 identical with ground floor with second layer structure.
As shown in Figure 3: metal electrode 2 curve form are: the accelerating voltage pulse shaping partly is a straight line, smoothly turn to 180 degree backs to form the matching section straight line at accelerating voltage pulse shaping part tail end, smoothly turn to 180 degree backs to form extraordinarily section straight line of pulse voltage again at the matching section tail end.
Claims (5)
1. dielectric wall accelerator, a kind of dielectric wall accelerator, comprise sealed cylinder, medium beam tube road (3) in the middle of the cylindrical shell, form the accelerated passage that connects in the middle of medium beam tube (3) road, the acceleration pulse of its each accelerator module forms device and comprises media plate (1), every media plate (1) upper and lower surface is furnished with metal electrode (2), be furnished with high voltage input terminal in the middle of the media plate (1), high voltage input terminal and wherein be connected to photoconductive switch between the metal electrode (2), it is characterized in that each accelerator module forms device by two-layer acceleration pulse at least and constitutes, each layer comprises symmetrical two the outer acceleration pulses formation devices of medium beam tube road (3) that are positioned on, and the formed magnetic field of metal electrode (2) the bending direction size that two symmetrical acceleration pulses formation device medium flat boards (1) are gone up cloth is identical, direction is opposite.
2. dielectric wall accelerator according to claim 1, it is identical to it is characterized in that the second layer two symmetrical media plates (1) and ground floor are positioned on the outer angle in medium beam tube road (3), it is identical with the formed magnetic direction of metal electrode (2) on ground floor the right that the media plate on the second layer left side (1) is gone up metal electrode (2), it is identical with the formed magnetic direction of metal electrode (2) on the ground floor left side that the media plate (1) on second layer the right is gone up metal electrode (2), and ground floor is identical with the magnetic field size that second layer media plate (1) is gone up metal electrode (2) formation.
3. dielectric wall accelerator according to claim 2, it is characterized in that the 3rd layer of two symmetrical media plate (1) is identical with the 4th layer of angle that is positioned on outside the medium beam tube road (3), the 3rd layer with the 4th layer of relative ground floor and second layer half-twist, the 3rd layer with the 4th layer of media plate (1) to go up metal electrode (2) identical with second layer structure with ground floor.
4. dielectric wall accelerator according to claim 1 is characterized in that it is crooked that media plate (1) is gone up the metal electrode (2) of cloth.
5. dielectric wall accelerator according to claim 4, it is characterized in that acceleration pulse forms device and comprises extraordinarily three functional sections of section of accelerating voltage pulse shaping part, matching section and pulse voltage, the media plate of three functional sections (1) is gone up metal electrode (2) curve form: the accelerating voltage pulse shaping partly is a straight line, smoothly turn to 180 degree backs to form the matching section straight line at accelerating voltage pulse shaping part tail end, smoothly turn to 180 degree backs to form extraordinarily section straight line of pulse voltage again at the matching section tail end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133723 CN102202457A (en) | 2010-03-26 | 2010-03-26 | Dielectric wall accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010133723 CN102202457A (en) | 2010-03-26 | 2010-03-26 | Dielectric wall accelerator |
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| CN102202457A true CN102202457A (en) | 2011-09-28 |
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| CN 201010133723 Pending CN102202457A (en) | 2010-03-26 | 2010-03-26 | Dielectric wall accelerator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4975917A (en) * | 1988-09-14 | 1990-12-04 | Harris Blake Corporation | Source of coherent short wavelength radiation |
| US5811944A (en) * | 1996-06-25 | 1998-09-22 | The United States Of America As Represented By The Department Of Energy | Enhanced dielectric-wall linear accelerator |
| US6331194B1 (en) * | 1996-06-25 | 2001-12-18 | The United States Of America As Represented By The United States Department Of Energy | Process for manufacturing hollow fused-silica insulator cylinder |
| CN101406110A (en) * | 2005-10-24 | 2009-04-08 | 劳伦斯利弗莫尔国家安全有限公司 | Sequentially pulsed traveling wave accelerator |
-
2010
- 2010-03-26 CN CN 201010133723 patent/CN102202457A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4975917A (en) * | 1988-09-14 | 1990-12-04 | Harris Blake Corporation | Source of coherent short wavelength radiation |
| US5811944A (en) * | 1996-06-25 | 1998-09-22 | The United States Of America As Represented By The Department Of Energy | Enhanced dielectric-wall linear accelerator |
| US6331194B1 (en) * | 1996-06-25 | 2001-12-18 | The United States Of America As Represented By The United States Department Of Energy | Process for manufacturing hollow fused-silica insulator cylinder |
| CN101406110A (en) * | 2005-10-24 | 2009-04-08 | 劳伦斯利弗莫尔国家安全有限公司 | Sequentially pulsed traveling wave accelerator |
Non-Patent Citations (2)
| Title |
|---|
| 《Physica Medica》 20080421 G.J. Caporaso et al. A compact linac for intensity modulated proton therapy based on a dielectric wall accelerator 98-101 1-5 第24卷, * |
| 《电工电能新技术》 20051031 严萍 等 新概念介质壁加速器 43-46, 80 1-5 第24卷, 第4期 * |
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Application publication date: 20110928 |