CN210075676U

CN210075676U - Laser ion accelerator

Info

Publication number: CN210075676U
Application number: CN201920293425.4U
Authority: CN
Inventors: 钱铁威
Original assignee: Guangdong Taiwei Accelerator Co Ltd
Current assignee: Guangdong Taiwei Accelerator Co Ltd
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2020-02-14
Anticipated expiration: 2029-03-08

Abstract

The utility model provides a laser ion accelerator, which comprises a target chamber, wherein an insulating support is fixedly arranged in the target chamber, a laser channel which penetrates through two sides of the target chamber is arranged on the insulating support, a solid target is arranged in the laser channel, the laser accelerator also comprises a laser, laser of the laser is injected from the left end of the laser channel, the laser accelerator also comprises a breather pipe, the breather pipe is vertically arranged with the laser channel, the breather pipe passes through the laser channel, the laser accelerator also comprises an annular gas ring, the gas ring is arranged in a hollow way, the gas ring is arranged at the right end of the laser channel, the gas ring is coaxially arranged with the laser channel, the gas ring is provided with an air inlet and an air outlet, the laser accelerator also comprises a circulating gas supply device, one end of the breather pipe is communicated with the circulating gas supply device, the other end of the breather pipe is communicated with the air inlet, the air outlet is communicated, the ion extraction pipe extends to the outer side of the target chamber, and the end part of the ion extraction pipe is connected with an ion linear accelerator.

Description

Laser ion accelerator

Technical Field

The utility model relates to a laser ion field with higher speed, concretely relates to laser ion accelerator.

Background

Due to the rapid development of laser technology, it has become possible to generate high-energy ion beams by using ultra-intense laser pulses to interact with solid targets, which has made it possible to build a new generation of compact, relatively inexpensive compact laser ion accelerators.

The laser pulse interacts with the solid target to generate thermal electrons with exponentially decaying energy spectrum, the thermal electrons penetrating through the target form an electric field behind the target, and ions can be accelerated in the electric field. However, the magnitude of the accelerating electric field is directly scaled by the distribution of the thermal electron spectrum, and particularly the electron distribution in the high-energy part of the thermal electron spectrum is greatly influenced; considering the effect of thermal electrons from the laser, the maximum energy of the ion beam is proportional to the square root of the laser intensity, which makes it difficult to efficiently increase the ion beam energy using conventional target post-crust acceleration mechanisms. The change of the solid target structure can improve the energy spectrum distribution of the ion beam, but cannot fundamentally change the calibration rate of the energy spectrum of the ion beam; also, the microstructures employed in many solid targets are not necessarily feasible because the pre-pulse creates a pre-plasma at the surface of the solid target. Compared with a target rear shell layer acceleration mechanism, the laser radiation pressure acceleration mechanism has higher energy conversion efficiency and can greatly improve the ion beam energy, however, the mechanism requires that the pre-pulse intensity is small enough, which requires that the laser pulse has good enough pulse contrast, and is particularly difficult at higher laser intensity.

SUMMERY OF THE UTILITY MODEL

To the problem pointed out in the background art, the utility model provides a simple structure, accelerate effectual laser ion accelerator.

The technical scheme of the utility model is realized like this:

a laser ion accelerator comprises a target chamber, wherein an insulating support is fixedly arranged in the target chamber, a laser channel penetrating through two sides of the target chamber is arranged on the insulating support, a solid target is arranged in the laser channel, the laser of the laser is jetted into the laser from the left end of the laser channel, the laser ion accelerator further comprises a vent pipe, the vent pipe is perpendicular to the laser channel and penetrates through the laser channel, the laser ion accelerator further comprises an annular gas ring, the gas ring is arranged in a hollow mode and is arranged at the right end of the laser channel, the gas ring and the laser channel are coaxially arranged, a gas inlet and a gas outlet are formed in the gas ring, a circulating gas supply device is further included, one end of the vent pipe is communicated with the circulating gas supply device, the other end of the vent pipe is communicated with the gas inlet, the gas outlet is communicated with the circulating gas supply device, an ion leading-out pipe is connected to the right end of the gas ring, the end of the ion extraction tube is connected with an ion linear accelerator.

The utility model discloses still further set up to, the diameter of breather pipe be less than the diameter of laser passageway.

The utility model discloses still further set up to, the laser instrument set up in the outside of target chamber, the laser that the laser instrument jetted out parallel with the laser channel and with the laser opposite direction in the laser channel, the laser that the laser instrument jetted out is led laser channel through speculum one and speculum two, speculum one sets up and lies in the laser instrument outside the target chamber and jets out the direction of laser, speculum two set up in the target chamber.

The utility model discloses still further set up to, the side of target chamber on be connected with the vacuum pipe, the other end of vacuum pipe link to each other with the vacuum pump through matching the pipeline.

The utility model discloses still further set up to, circulation air feeder in gaseous helium or nitrogen gas or argon gas.

The utility model discloses still further set up to, be equipped with condensing lens between the other end of laser passageway and the gas distribution ring, be equipped with the space that supplies laser to pass in the middle of the condensing lens.

The utility model discloses still further set up to, the solid target pass through insulating seat and laser channel and be connected, the insulating seat is the annular, the fixed intermediate position that sets up at the insulating seat of solid target.

The utility model has the advantages that:

(1) according to the laser ion accelerator provided by the utility model, the laser pulse output by the laser device is shot to the vent pipe after passing through the reflector and the condenser lens, the circulating gas supply device is used for introducing gas into the vent pipe, and before the laser main pulse, the prepulse can partially ionize the gas in the vent pipe but will be dissipated due to diffraction effect; the main pulse front edge will further ionized gas produce near critical density or low density plasma to produce relativistic electron through the direct acceleration mechanism of laser, electron flow to gas ring forms round electric field on gas ring, at the electric field of solid target after-shape, laser ion can obtain more efficient acceleration in this electric field, increase the ion beam energy, make the ion beam can obtain better acceleration effect, can be better follow the ion extraction pipe and jet out.

(2) The utility model provides a laser ion accelerator, the laser that its laser instrument jetted out gets into laser channel after the reflection of 2 speculum, and its structural design is reasonable for whole equipment can be designed small and exquisite portablely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a schematic structural diagram of the gas circulation in the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The present invention is described below with reference to fig. 1-3:

the utility model provides a laser ion accelerator, includes target chamber 10, target chamber 10 internal fixation be equipped with insulating support 20, be equipped with the laser passageway 30 that link up target chamber 10 both sides on insulating support 20, be equipped with solid target 40 in the laser passageway 30, still include laser 50, laser 50's laser is penetrated from the left end of laser passageway 30.

The laser device is characterized by further comprising a vent pipe 60, wherein the vent pipe 60 is a straight pipe vertically arranged in the drawing, the vent pipe 60 is perpendicular to the laser channel 30, the vent pipe 60 penetrates through the laser channel 30, the laser device further comprises an annular gas ring 70, the gas ring 70 is arranged in a hollow mode, the gas ring 70 is arranged at the right end of the laser channel 30, the gas ring 70 and the laser channel 30 are coaxially arranged, and a gas inlet 80 and a gas outlet 90 are formed in the gas ring 70.

Still include circulation air feeder 100, the one end and the circulation air feeder 100 intercommunication of breather pipe 60, the other end of breather pipe 60 with air inlet 80 communicate, gas outlet 90 and circulation air feeder 100 communicate, the right-hand member of gas ring 70 is connected with ion extraction pipe 101, ion extraction pipe 101 extends to the outside of target chamber 10, the end connection of ion extraction pipe 101 has ion linear accelerator 102.

Circulation gas supply device 100 can circulate gas in snorkel 60 and gas ring 70, and electrons generated by laser ionization can flow in snorkel 60 and gas ring 70, so that annular electric field can be formed in gas ring 70 for accelerating laser ions.

Wherein the diameter of the vent tube 60 is smaller than the diameter of the laser channel 30. In this arrangement, a portion of the laser light will impinge on the vent tube and a portion will pass through the side of the vent tube to the target.

The laser 50 is arranged outside the target chamber 10, the laser emitted by the laser 50 is parallel to the laser channel 30 and opposite to the laser direction in the laser channel 30, the laser emitted by the laser 50 is guided to the laser channel 30 through the first reflecting mirror 103 and the second reflecting mirror 104, the first reflecting mirror 103 is arranged outside the target chamber 10 and located in the laser emitting direction of the laser 50, and the second reflecting mirror 104 is arranged inside the target chamber 10. The incidence direction of the laser is changed through the reflecting mirror, so that the design of the position of the laser is facilitated, and the volume of the whole device can be designed to be small and exquisite.

Wherein, the side of the target chamber 10 is connected with a vacuum pipeline 105, and the other end of the vacuum pipeline 105 is connected with a vacuum pump 107 through a matching pipeline 106.

The gas in the circulating gas supply device 100 is helium, nitrogen or argon.

Wherein, a condenser lens 108 is arranged between the other end of the laser channel 30 and the gas distribution ring 70, and a space for the laser to pass through is arranged in the middle of the condenser lens 108. The laser beams are reflected and converged by the condenser lens, so that the incident effect of the laser beams is improved, and scattering is reduced.

The solid target 40 is connected to the laser channel 30 through an insulating base 109, the insulating base 109 is annular, and the solid target 40 is fixedly disposed in the middle of the insulating base 109.

The utility model has the advantages that:

(1) according to the laser ion accelerator provided by the utility model, the laser pulse output by the laser 50 is emitted to the breather pipe 60 after passing through the reflector and the condenser lens 108, the gas is introduced into the breather pipe 60 by the circulating gas supply device 100, and before the laser main pulse, the prepulse can partially ionize the gas in the breather pipe 60 but will be scattered due to diffraction effect; the main pulse front edge will further ionized gas produce near critical density or low density plasma to through the direct acceleration mechanism of laser produce relativistic electron, electron flow to gas ring 70 forms a round of electric field on gas ring 70, at the electric field of solid target 40 after-form, laser ion can obtain more efficient acceleration in this electric field, increase the ion beam energy, make the ion beam can obtain better acceleration effect, can be better follow the emission of ion extraction pipe 101.

(2) The utility model provides a laser ion accelerator, the laser that its laser instrument 50 jetted out enters laser channel 30 after the reflection of 2 speculum, its structural design is reasonable for whole equipment can be designed small and exquisite portablely.

The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser ion accelerator, characterized by: comprises a target chamber, an insulating support fixedly arranged in the target chamber, a laser channel penetrating through two sides of the target chamber and arranged on the insulating support, a solid target arranged in the laser channel, a laser device with laser injected from the left end of the laser channel, and a vent pipe, the aeration pipe is arranged vertically to the laser channel, the aeration pipe penetrates through the laser channel, the aeration pipe further comprises an annular gas ring, the gas ring is arranged in a hollow manner, the gas ring is arranged at the right end of the laser channel and is coaxial with the laser channel, the gas ring is provided with a gas inlet and a gas outlet, the aeration pipe further comprises a circulating gas supply device, one end of the aeration pipe is communicated with the circulating gas supply device, the other end of the aeration pipe is communicated with the gas inlet, the gas outlet is communicated with the circulating gas supply device, the right end of the gas ring is connected with an ion extraction pipe, the ion extraction pipe extends to the outer side of the target chamber, and the end part of the ion extraction pipe is connected with an ion linear accelerator.

2. A laser ion accelerator according to claim 1 wherein: the diameter of the vent pipe is smaller than that of the laser channel.

3. A laser ion accelerator according to claim 2 wherein: the laser device is arranged on the outer side of the target chamber, laser emitted by the laser device is parallel to the laser channel and opposite to the laser direction in the laser channel, the laser emitted by the laser device is guided to the laser channel through the first reflecting mirror and the second reflecting mirror, the first reflecting mirror is arranged on the outer side of the target chamber and is located in the direction in which the laser emitted by the laser device, and the second reflecting mirror is arranged in the target chamber.

4. A laser ion accelerator according to claim 3 wherein: the side surface of the target chamber is connected with a vacuum pipeline, and the other end of the vacuum pipeline is connected with a vacuum pump through a matching pipeline.

5. A laser ion accelerator according to claim 3 wherein: the gas in the circulating gas supply device is helium, nitrogen or argon.

6. A laser ion accelerator according to claim 3 wherein: a condensing lens is arranged between the other end of the laser channel and the gas distribution ring, and a space for the laser to pass through is arranged in the middle of the condensing lens.

7. A laser ion accelerator according to claim 3 wherein: the solid target is connected with the laser channel through the insulating seat, the insulating seat is annular, and the solid target is fixedly arranged in the middle of the insulating seat.