CN113784495A - High-gradient and high-strength harmonic accelerator - Google Patents
High-gradient and high-strength harmonic accelerator Download PDFInfo
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- CN113784495A CN113784495A CN202111060596.0A CN202111060596A CN113784495A CN 113784495 A CN113784495 A CN 113784495A CN 202111060596 A CN202111060596 A CN 202111060596A CN 113784495 A CN113784495 A CN 113784495A
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- drift tube
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- 230000001133 acceleration Effects 0.000 claims abstract description 36
- 230000005684 electric field Effects 0.000 description 10
- 230000007547 defect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/14—Vacuum chambers
- H05H7/18—Cavities; Resonators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/22—Details of linear accelerators, e.g. drift tubes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/22—Details of linear accelerators, e.g. drift tubes
- H05H2007/222—Details of linear accelerators, e.g. drift tubes drift tubes
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses a high-gradient high-strength harmonic accelerator which is provided with an accelerating cavity and a T-shaped plate, wherein end plates are arranged on two sides of the accelerating cavity, the T-shaped plate is respectively arranged on the upper surface and the lower surface in the accelerating cavity, a plurality of drift tubes and drift tube supporting rods with the same number as the drift tubes are arranged in the accelerating cavity, the drift tubes are fixedly connected with one ends of the drift tube supporting rods, and the other ends of the drift tube supporting rods are fixedly connected with the T-shaped plate; the drift tubes are positioned on the same axis and on the central line of the acceleration cavity; one part of the drift tube supporting rods are arranged on the upper surface in the acceleration cavity, the other part of the drift tube supporting rods are arranged on the lower surface in the acceleration cavity, and the upper drift tube supporting rods and the lower drift tube supporting rods are arranged in a staggered mode; the area between the adjacent drift tubes is an acceleration gap, and the length of each acceleration gap is basically consistent.
Description
Technical Field
The invention relates to an ion acceleration structure in the technical field of nuclear energy, in particular to a high-gradient large-strength harmonic accelerator.
Background
Since the birth in 1932, the DT-type accelerator has become the most popular structure of the room temperature accelerator at present. The acceleration principle is that when injected charged particles pass through a designed DT gap, the DT gap is just a positive electric field, so that the charged particles can be accelerated in the field direction; after a half high-frequency period, when the electric field of the DT gap is changed into a negative electric field, the particles just enter the DT, and because of the electromagnetic shielding effect, the charged particles cannot feel the negative electric field and are decelerated; also after the next high frequency period into the next DT gap, the electric field in the DT gap becomes again positive, so that the charged particles have a tendency to accelerate throughout the structure. The common interdigital drift tube accelerating structure has the characteristic of high shunt resistance, so that the interdigital drift tube accelerating structure is the fastest accelerating cavity developed in the last two decades.
However, the cavity of the general interdigital drift tube accelerating structure utilizes the lowest TE111 frequency mode in TE modes, and the mode has the defects that the on-axis field is easily concentrated in the middle of the cavity and is low at two ends of the cavity, so that the cavity is easily limited by the discharge (cavity ignition) limit during operation and cannot increase more power operation.
Disclosure of Invention
In view of the defects of the prior art, the present invention aims to provide a high-gradient large-strength harmonic accelerator, which is designed based on the symmetry of harmonics such that each acceleration gap is located at the same electric field strength position, thereby obtaining the condition that the field strength of each acceleration gap is the same, and therefore the field strength of one acceleration gap is particularly high and the field strength of other acceleration gaps is lower in a mode different from the TE111 mode.
Secondly, the cavity accelerated by the higher harmonic wave (TE11n) can effectively reduce the defect of local electric field concentration of the cavity, so that the cavity can operate at higher power without worrying about the fact that the cavity is ignited to stop operating. The design of the invention gives consideration to the advantages of high shunt impedance of the interdigital structure, reduces the defect of local field concentration and greatly widens the application of the drift tube type resonant cavity.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-gradient high-strength harmonic accelerator is provided with an accelerating cavity and a T-shaped plate, wherein end plates are arranged on two sides of the accelerating cavity, the T-shaped plate is respectively arranged on the upper surface and the lower surface in the accelerating cavity, a plurality of drift tubes and a plurality of drift tube supporting rods with the same number as the drift tubes are arranged in the accelerating cavity, the drift tubes are fixedly connected with one ends of the drift tube supporting rods, and the other ends of the drift tube supporting rods are fixedly connected with the T-shaped plate; the drift tubes are positioned on the same axis and on the central line of the acceleration cavity; one part of the drift tube supporting rods are arranged on the upper surface in the acceleration cavity, the other part of the drift tube supporting rods are arranged on the lower surface in the acceleration cavity, and the upper drift tube supporting rods and the lower drift tube supporting rods are arranged in a staggered mode; the area between the adjacent drift tubes is an acceleration gap, and the length of each acceleration gap is basically consistent.
It should be noted that the arrangement direction of the drift tube support rod at the first position is opposite to that of the drift tube support rod at the last position, the arrangement direction of the drift tube support rod at the first position is opposite to that of the drift tube support rod at the second position, and the arrangement direction of the drift tube support rod at the last position is opposite to that of the drift tube support rod at the previous position.
It should be noted that a plurality of drift tube groups are arranged between the drift tube support rod at the first position and the drift tube support rod at the last position, and each drift tube group comprises the drift tube support rods which are arranged in pairs and in the same direction and a drift tube connected to one end of each drift tube support rod.
It should be noted that the drift tube support rods of the adjacent drift tube groups are arranged in opposite directions.
It should be noted that the high-order frequency mode in the cavity generated by the plurality of drift tube groups can be excellent, wherein the high-order frequency mode of TE11n can make the flatness of the on-axis field excellent.
It should be noted that the drift tube is a cylindrical electrode, and a cylindrical beam current channel is arranged in the center of the drift tube.
It should be noted that the acceleration chamber has a vacuum degree of 10-4-10-7Pa vacuum cavity cylinder.
The invention is mainly characterized in that the flatness of electric field distribution on the cavity shaft is realized by designing the direction of each group of drift tube supporting rods and utilizing a high-order resonance mode. In addition, the electric field distribution on the shaft of the cavity is very smooth, and the defect of serious electric field concentration on the shaft of the traditional drift tube type cavity is overcome. The device can be used for accelerating low-energy ion beams or applied high-frequency cavity devices such as beam bunchers and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
As shown in fig. 1, the present invention is a high-gradient high-strength harmonic accelerator, which has an acceleration cavity 1 and a T-shaped plate 2, wherein two sides of the acceleration cavity 1 are end plates, the T-shaped plate 2 is respectively disposed on the upper surface and the lower surface in the acceleration cavity, a plurality of drift tubes 3 and drift tube support rods 4 having the same number as the drift tubes 3 are disposed in the acceleration cavity, wherein the drift tubes 3 are fixedly connected to one end of the drift tube support rods 4, and the other end of the drift tube support rods 4 is fixedly connected to the T-shaped plate 2; the drift tubes 3 are positioned on the same axis and on the central line of the acceleration cavity 1; one part of the drift tube support rods 4 are arranged on the inner upper surface of the acceleration cavity 1, the other part of the drift tube support rods 4 are arranged on the inner lower surface of the acceleration cavity 1, and the upper drift tube support rods and the lower drift tube support rods are arranged in a staggered manner; the area between adjacent drift tubes 3 is an acceleration gap 5 and the length of each acceleration gap 5 is substantially uniform.
Furthermore, according to the present invention, the arrangement direction of the drift tube support rod located at the first position is opposite to that of the drift tube support rod located at the last position, the arrangement direction of the drift tube support rod located at the first position is opposite to that of the drift tube support rod located at the second position, and the arrangement direction of the drift tube support rod located at the last position is opposite to that of the drift tube support rod located at the previous position.
Furthermore, a plurality of drift tube groups are arranged between the drift tube support rod at the first position and the drift tube support rod at the last position, and each drift tube group comprises the drift tube support rods which are arranged in pairs and in the same direction and a drift tube connected to one end of each drift tube support rod.
Furthermore, the arrangement directions of the drift tube support rods of the adjacent drift tube groups are opposite.
Further, the plurality of drift tube groups can generate higher-order frequency modes in the TE mode in the cavity, wherein the higher-order frequency modes of the TE11n can enable the flatness of the on-axis field to be excellent.
It should be noted that the drift tube of the present invention is a cylindrical electrode, and a cylindrical beam current channel is arranged in the center of the drift tube.
It should be noted that the acceleration chamber of the present invention has a vacuum degree of 10-4-10-7Pa vacuum cavity cylinder.
Examples
In the accelerating cavity, the first drift tube support rod and the second drift tube support rod are arranged in opposite directions to form 180 degrees, the last drift tube support rod and the last but one drift tube support rod are arranged in opposite directions to form 180 degrees, and the first drift tube support rod and the last drift tube support rod are arranged in opposite directions to form 180 degrees; then removing the first drift tube support rod and the last drift tube support rod, wherein the rest drift tubes and the drift tube support rods need to be paired; every two drift tube support rods form a group from the second drift tube support rod fixedly connected with the T-shaped plate; the T-shaped plates connected with each group of drift tube supporting rods are consistent; the directions of two adjacent groups of drift tube supporting rods are designed to be opposite to each other to form 180 degrees; the drift tube and the cavity are on the same central line.
Various modifications may be made by those skilled in the art based on the above technical solutions and concepts, and all such modifications or changes to other agents to be sprayed are intended to be included within the scope of the present invention.
Claims (7)
1. A high-gradient high-strength harmonic accelerator is provided with an acceleration cavity and a T-shaped plate, wherein end plates are arranged on two sides of the acceleration cavity, and the T-shaped plate is respectively arranged on the upper surface and the lower surface in the acceleration cavity; the drift tubes are positioned on the same axis and on the central line of the acceleration cavity; one part of the drift tube supporting rods are arranged on the upper surface in the acceleration cavity, the other part of the drift tube supporting rods are arranged on the lower surface in the acceleration cavity, and the upper drift tube supporting rods and the lower drift tube supporting rods are arranged in a staggered mode; the area between the adjacent drift tubes is an acceleration gap, and the length of each acceleration gap is basically consistent.
2. The high gradient high intensity harmonic accelerator of claim 1, wherein the drift tube support bar at the first position is disposed in a direction opposite to the drift tube support bar at the last position, the drift tube support bar at the first position is disposed in a direction opposite to the drift tube support bar at the second position, and the drift tube support bar at the last position is disposed in a direction opposite to the drift tube support bar at the previous position.
3. The high-gradient high-strength harmonic accelerator according to claim 2, wherein a plurality of drift tube groups are disposed between the drift tube support bar at the first position and the drift tube support bar at the last position, each of the drift tube groups comprises the drift tube support bars disposed in pairs and in the same direction, and a drift tube connected to one end of the drift tube support bar.
4. The high gradient high intensity harmonic accelerator of claim 3 wherein the drift tube support bars of adjacent drift tube groups are arranged in opposite directions.
5. The high gradient high intensity harmonic accelerator of claim 4 wherein the higher frequency modes of the cavity in the TE mode are generated by the plurality of drift tube banks, wherein the higher frequency modes of TE11n provide excellent flatness of the on-axis field.
6. The high gradient, high intensity harmonic accelerator of claim 1 in which the drift tube is a cylindrical electrode with a cylindrical beam current channel in the center of the drift tube.
7. The high gradient high intensity harmonic accelerator of claim 1 wherein the acceleration cavity is vacuum 10-4-10-7Pa vacuum cavity cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111060596.0A CN113784495A (en) | 2021-09-10 | 2021-09-10 | High-gradient and high-strength harmonic accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111060596.0A CN113784495A (en) | 2021-09-10 | 2021-09-10 | High-gradient and high-strength harmonic accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113784495A true CN113784495A (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111060596.0A Pending CN113784495A (en) | 2021-09-10 | 2021-09-10 | High-gradient and high-strength harmonic accelerator |
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| CN (1) | CN113784495A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6777893B1 (en) * | 2002-05-02 | 2004-08-17 | Linac Systems, Llc | Radio frequency focused interdigital linear accelerator |
| JP2006351233A (en) * | 2005-06-13 | 2006-12-28 | Natl Inst Of Radiological Sciences | H mode drift tube linear accelerator |
| JP2009205939A (en) * | 2008-02-28 | 2009-09-10 | Hitachi Ltd | Drift-tube accelerator |
| JP2010040462A (en) * | 2008-08-08 | 2010-02-18 | Mitsubishi Electric Corp | Ih type drift tube linear accelerator |
| CN103026802A (en) * | 2010-07-12 | 2013-04-03 | 三菱电机株式会社 | Drift tube linear accelerator |
| CN204598450U (en) * | 2015-02-11 | 2015-08-26 | 中国科学院近代物理研究所 | Single chamber multi beam type drift tube ion accelerator and equipment |
| CN107251658A (en) * | 2015-02-25 | 2017-10-13 | 三菱电机株式会社 | The synchrotron method of operation for entering reflector system and draft tube linac |
| CN109936909A (en) * | 2019-04-02 | 2019-06-25 | 清华大学 | A kind of fixed structure and interdigital drift tube accelerator of drift tube |
-
2021
- 2021-09-10 CN CN202111060596.0A patent/CN113784495A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6777893B1 (en) * | 2002-05-02 | 2004-08-17 | Linac Systems, Llc | Radio frequency focused interdigital linear accelerator |
| JP2006351233A (en) * | 2005-06-13 | 2006-12-28 | Natl Inst Of Radiological Sciences | H mode drift tube linear accelerator |
| JP2009205939A (en) * | 2008-02-28 | 2009-09-10 | Hitachi Ltd | Drift-tube accelerator |
| JP2010040462A (en) * | 2008-08-08 | 2010-02-18 | Mitsubishi Electric Corp | Ih type drift tube linear accelerator |
| CN103026802A (en) * | 2010-07-12 | 2013-04-03 | 三菱电机株式会社 | Drift tube linear accelerator |
| CN204598450U (en) * | 2015-02-11 | 2015-08-26 | 中国科学院近代物理研究所 | Single chamber multi beam type drift tube ion accelerator and equipment |
| CN107251658A (en) * | 2015-02-25 | 2017-10-13 | 三菱电机株式会社 | The synchrotron method of operation for entering reflector system and draft tube linac |
| CN109936909A (en) * | 2019-04-02 | 2019-06-25 | 清华大学 | A kind of fixed structure and interdigital drift tube accelerator of drift tube |
Non-Patent Citations (1)
| Title |
|---|
| L. LU等: "STUDY ON A 325MHz HOM DRIFT TUBE LINAC", 《29TH LINEAR ACCELERATOR CONF.》 * |
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Application publication date: 20211210 |