CN204259270U - Plasma cascade lasing ion accelerator - Google Patents
Plasma cascade lasing ion accelerator Download PDFInfo
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- CN204259270U CN204259270U CN201420803976.8U CN201420803976U CN204259270U CN 204259270 U CN204259270 U CN 204259270U CN 201420803976 U CN201420803976 U CN 201420803976U CN 204259270 U CN204259270 U CN 204259270U
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Abstract
The utility model discloses a kind of plasma cascade lasing ion accelerator, comprise main support, nozzle, feeder, gas, target support, solid target, vacuum chamber, laser and off-axis paraboloidal mirror, main support, nozzle, target support, solid target and off-axis paraboloidal mirror are in vacuum chamber, main support is provided with laser channeling and jet channel, the upper end of jet channel is provided with nozzle, nozzle is connected with outside feeder, target support is fixedly connected with main support by screw thread, one end of laser channeling is laser entrance port, the other end of laser channeling is target support, the entrance of target support is provided with solid target.The laser pulse that laser exports focuses on jet channel edge through off-axis paraboloidal mirror, and ionized gas also produces Relativistic Electron by the direct acceleration mechanism of laser, and after solid target, form stronger electrostatic field, ion obtains more high efficiency and accelerates.The utility model has the advantages that structure is simple, easy to operate and energy conversion efficiency is high.
Description
Technical field
The utility model relates to lasing ion and accelerates field, particularly relates to a kind of plasma cascade lasing ion accelerator.
Background technology
Due to developing rapidly of laser technology, ultra intense laser pulse and solid target can be utilized to interact and to have produced high energy ion beam, this makes to build a new generation's miniaturized lasing ion accelerator that is compact, cost relative moderate becomes possibility, thus promotes the application such as tumour ion beam therapy and PET diagnosis further.In 2006, Nature periodical is delivered and has accelerated initiative experimental result based on the lasing ion of shell acceleration mechanism after target.According to shell acceleration mechanism after target, laser pulse and solid target interact and produce the hot electron that power spectrum exponentially decays, and the hot electron of transmission target forms electrostatic field after target, and ion can obtain acceleration in this electrostatic field.But the size of this acceleration electrostatic field is directly calibrated by hot electron spectral distribution, in the electron spectrum that is particularly heated, the impact of energetic portions electron distributions situation is very large; Consider that hot electron derives from the effect of laser, the ceiling capacity of ion beam is directly proportional to the square root of laser intensity, and after this makes to utilize conventional target, shell acceleration mechanism is difficult to efficiently increase ion beam energy.Although and change the measures such as solid target structures can improve energy spectra of ion beams distribution, fundamentally can not change the calibration rate of energy spectra of ion beams; Meanwhile, because prepulsing produces Pre-plasma on solid target surface, the micro-structural adopted in many solid targets might not be feasible.Compared with shell acceleration mechanism after target, laser emission pressure acceleration mechanism has higher energy conversion efficiency, greatly can improve ion beam energy, but this mechanism requires that prepulsing intensity is enough little, this just requires that laser pulse has enough good contrast ration, particularly difficult when higher laser intensity.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art, provides a kind of plasma cascade lasing ion accelerator.The feature that this invention should have that structure is simple, clear principle, easy to operate and energy conversion efficiency improve.
Technical solution of the present utility model is as follows:
A kind of plasma cascade lasing ion accelerator, comprise main support, nozzle, feeder, gas, target support, solid target, vacuum chamber, laser and off-axis paraboloidal mirror, main support, nozzle, target support, solid target and off-axis paraboloidal mirror are arranged in vacuum chamber, main support is provided with laser channeling and jet channel, the upper end of jet channel is provided with nozzle, nozzle is connected with outside feeder and to gas jet in jet channel, target support (5) is fixedly connected with main support by screw thread, one end of laser channeling is laser entrance port, the other end of laser channeling is target support, the entrance of target support is provided with solid target, the laser pulse that laser exports focuses on jet channel left side edge through off-axis paraboloidal mirror, ionized gas produces near critical density or low density plasmas, and produce Relativistic Electron by the direct acceleration mechanism of laser, by relativistic self-aiming, the laser pulse of the theory of relativity intensity continues to interact with solid target to produce hot electron, stronger electrostatic field is formed after solid target, produce by the ion beam of more high efficiency acceleration.
Optimize further for realizing the utility model, further step is: described main support and target support are made up of acrylic glass material, and the shape of main support and target support is hollow cylindrical.The aperture size of described laser channeling is 0.1mm-5mm.The aperture size of described jet channel is 0.1mm-3mm.Described laser is CPA laser system, and the pulsewidth of the laser pulse of output is 30fs-500fs, and the laser linewidth after focusing is 3 μm-30 μm, and normalization vector potential amplitude size is 3-30.Described gas is hydrogen or helium or oxygen or nitrogen or argon gas.Described solid target is the single layer flakes that gold or copper or aluminium or palladium are made.The sheet metal of solid target is coated with polyethylene film or thin layer of metal oxide.The thickness of solid target is 1 μm-200 μm.
Principle of the present utility model is as follows:
After lasing ion target in shell acceleration mechanism, ion beam energy directly depends on the size of the electrostatic field that hot electron is set up after target.The laser pulse that laser exports focuses on jet channel left side edge through off-axis paraboloidal mirror, and before main pulse, prepulsing can partly ionized gas but will disperse due to diffraction effect; Further ionized gas is produced near critical density or low density plasmas by main pulse forward position, and produce Relativistic Electron by the direct acceleration mechanism of laser, simultaneously, due to relativistic self-aiming, be still that the main pulse continuation of the theory of relativity intensity and solid target interact and continue to produce hot electron.Thus make greater amount electron distributions at the high energy afterbody of hot electron power spectrum, after solid target, form stronger electrostatic field, ion can obtain more high efficiency acceleration in this electrostatic field, increases ion beam energy.
Advantage of the present utility model:
1, effectively can eliminate the impact of prepulsing, various micro-structural target can be made more effective.
2, by plasma cascade, can control in ionized gas section the plasma producing suitable length and density flexibly, more effectively utilize the direct acceleration mechanism of laser to produce relativistic electron.
3, greater amount electron distributions can be made at the high energy afterbody of hot electron power spectrum, after solid target, form stronger ion accelerate electrostatic field.
4, the utility model have that structure is simple, clear principle, the feature that easy to operate, energy conversion efficiency is high.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model plasma cascade lasing ion accelerator.
In figure: 1, main support, 2, nozzle, 3, feeder, 4, gas, 5, target support, 6, solid target, 7, vacuum chamber, 8, laser, 9, off-axis paraboloidal mirror, 101, laser channeling, 102, jet channel, 801, laser pulse.
Embodiment
See accompanying drawing 1: a kind of plasma cascade lasing ion accelerator, comprise main support 1, nozzle 2, feeder 3, gas 4, target support 5, solid target 6, vacuum chamber 7, laser 8 and off-axis paraboloidal mirror 9, main support 1, nozzle 2, target support 5, solid target 6 and off-axis paraboloidal mirror 9 are arranged in vacuum chamber 7, main support 1 is provided with laser channeling 101 and jet channel 102, the upper end of jet channel 102 is provided with nozzle 2, nozzle 2 is connected with outside feeder 3 and to gas jet 4 in jet channel 102, target support 5 is fixedly connected with main support 1 by screw thread, one end of laser channeling 101 is laser entrance port, the other end of laser channeling 101 is target support 5, the entrance of target support 5 is provided with solid target 6, the laser pulse 801 that laser 8 exports focuses on jet channel 102 left side edge through off-axis paraboloidal mirror 9, ionized gas 4 produces near critical density or low density plasmas, and produce Relativistic Electron by the direct acceleration mechanism of laser, by relativistic self-aiming, the laser pulse of the theory of relativity intensity continues to interact with solid target 6 to produce hot electron, stronger electrostatic field is formed after solid target 6, produce by the ion beam of more high efficiency acceleration.Described main support 1 and target support 5 are made up of acrylic glass material, and the shape of main support 1 and target support 5 is hollow cylindrical.The aperture size of described laser channeling 101 is 0.1mm-5mm.The aperture size of described jet channel 102 is 0.1mm-3mm.Described laser 8 is CPA laser system, and the pulsewidth of the laser pulse of output is 30fs-500fs, and the laser linewidth after focusing is 3 μm-30 μm, and normalization vector potential amplitude size is 3-30.Described gas 4 is hydrogen or helium or oxygen or nitrogen or argon gas.Described solid target 6 is the single layer flakes that gold or copper or aluminium or palladium are made.The sheet metal of solid target 6 is coated with polyethylene film or thin layer of metal oxide.The thickness of solid target 6 is 1 μm-200 μm.
Embodiment: by target support 5 by the screw thread between main support 1, precession or back-out target support 5, the solid target 6 of the porch of target support 5 is made just to be in the edge of jet channel 102, by nozzle 2 to gas jet 4 in jet channel 102, define by relatively low close gas 4 and highly dense solid target 6 grades of structures be linked togather, the width of gas 4 can be changed by the aperture changing jet channel 102.The laser pulse 801 that laser 8 exports focuses on jet channel 102 left side edge through off-axis paraboloidal mirror 9, and before main pulse, prepulsing can partially ionized gas 4 but will disperse due to diffraction effect; The further ionized gas 4 in main pulse forward position produces near critical density or low density plasmas, and produce Relativistic Electron by the direct acceleration mechanism of laser, simultaneously, due to relativistic self-aiming, be still that the main pulse continuation of the theory of relativity intensity and solid target 6 interact and continue to produce hot electron.These Relativistic Electron and hot electron are through solid target 6, the electron spectrum distribution that high energy afterbody assembles a large amount of electronics is formed in after solid target 6, thus the electrostatic field greatly strengthened after solid target 6, ion obtains more high efficiency acceleration and energy gain in this electrostatic field.
In the present embodiment, solid target 6 surface is vertical with the laser beam direction of propagation, can by changing the end face of target support 5, make solid target 6 surface become an inclination angle with the laser beam direction of propagation, solid target 6 surface can be plane or the micro-structural target with projection, depression.The utility model has the advantages that structure is simple, easy to operate, energy conversion efficiency is high, may be used for miniaturized lasing ion accelerator.
Claims (9)
1. a plasma cascade lasing ion accelerator, it is characterized in that, described plasma cascade lasing ion accelerator comprises main support (1), nozzle (2), feeder (3), gas (4), target support (5), solid target (6), vacuum chamber (7), laser (8) and off-axis paraboloidal mirror (9), main support (1), nozzle (2), target support (5), solid target (6) and off-axis paraboloidal mirror (9) are arranged in vacuum chamber (7), main support (1) is provided with laser channeling (101) and jet channel (102), the upper end of jet channel (102) is provided with nozzle (2), nozzle (2) is connected with outside feeder (3), target support (5) is fixedly connected with main support (1) by screw thread, one end of laser channeling (101) is laser entrance port, the other end of laser channeling (101) is target support (5), the entrance of target support (5) is provided with solid target (6).
2. plasma cascade lasing ion accelerator according to claim 1, it is characterized in that, described main support (1) and target support (5) are made up of acrylic glass material, and the shape of main support (1) and target support (5) is hollow cylindrical.
3. plasma cascade lasing ion accelerator according to claim 1, is characterized in that, the aperture size of described laser channeling (101) is 0.1mm-5mm.
4. plasma cascade lasing ion accelerator according to claim 1, is characterized in that, the aperture size of described jet channel (102) is 0.1mm-3mm.
5. plasma cascade lasing ion accelerator according to claim 1, it is characterized in that, described laser (8) is CPA laser system, the pulsewidth of the laser pulse exported is 30fs-500fs, laser linewidth after focusing is 3 μm-30 μm, and normalization vector potential amplitude size is 3-30.
6. plasma cascade lasing ion accelerator according to claim 1, is characterized in that, described gas (4) is hydrogen or helium or oxygen or nitrogen or argon gas.
7. plasma cascade lasing ion accelerator according to claim 1, is characterized in that, described solid target (6) is the single layer flakes that gold or copper or aluminium or palladium are made.
8., according to claim 1 or plasma cascade lasing ion accelerator according to claim 7, it is characterized in that, the sheet metal of solid target (6) is coated with polyethylene film or thin layer of metal oxide.
9., according to claim 1 or plasma cascade lasing ion accelerator according to claim 7, it is characterized in that, the thickness of solid target (6) is 1 μm-200 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803976.8U CN204259270U (en) | 2014-12-18 | 2014-12-18 | Plasma cascade lasing ion accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420803976.8U CN204259270U (en) | 2014-12-18 | 2014-12-18 | Plasma cascade lasing ion accelerator |
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| CN204259270U true CN204259270U (en) | 2015-04-08 |
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| CN201420803976.8U Expired - Fee Related CN204259270U (en) | 2014-12-18 | 2014-12-18 | Plasma cascade lasing ion accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867529A (en) * | 2015-05-12 | 2015-08-26 | 南华大学 | Medical isotope generation method and device based on laser wake-field accelerator |
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2014
- 2014-12-18 CN CN201420803976.8U patent/CN204259270U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104867529A (en) * | 2015-05-12 | 2015-08-26 | 南华大学 | Medical isotope generation method and device based on laser wake-field accelerator |
| CN104867529B (en) * | 2015-05-12 | 2017-08-29 | 南华大学 | A kind of medical-isotope production method and device based on laser wakefield accelerator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20171218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |