CN102170086B - Device for generating X rays by laser irradiation of solid cone target - Google Patents
Device for generating X rays by laser irradiation of solid cone target Download PDFInfo
- Publication number
- CN102170086B CN102170086B CN2011100644734A CN201110064473A CN102170086B CN 102170086 B CN102170086 B CN 102170086B CN 2011100644734 A CN2011100644734 A CN 2011100644734A CN 201110064473 A CN201110064473 A CN 201110064473A CN 102170086 B CN102170086 B CN 102170086B
- Authority
- CN
- China
- Prior art keywords
- target
- ray
- laser
- solid
- cone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
- X-Ray Techniques (AREA)
Abstract
The invention discloses a device for generating X rays by the laser irradiation of solid cone target. The device comprises a laser (1), a vacuum chamber (2), a driving laser inlet (4), a target component and an apparatus, wherein the driving laser inlet (4) is formed on the vacuum chamber (2), and is in fit with the laser (1); the target component is arranged in the vacuum chamber (2); and the apparatus receives the X rays. The device is characterized in that: the target component consists of the solid cone target (601) and a bracket (602) for fixing the solid cone target; and the cone bottom surface of the solid cone target (601) is positioned on one side close to the driving laser inlet (4), and the cone apex of the solid cone target (601) is positioned on the side close to the apparatus for receiving the X rays; the apparatus for receiving the X rays consists of an X ray detector (701), a bent crystal (702), a pinhole (703) and a sample cavity (704); and a plurality of X rays are simultaneously led out by the bent crystal (702) and the pinhole (703) to diagnose a sample in the sample cavity (704).
Description
Technical field
The present invention is a kind of device that utilizes laser irradiation to produce X ray.
Background technology
Laser and solid interact the x-ray source that produces because its cost is low, pulsewidth is short, brightness is high, accurate unipotency is good, be convenient to load the characteristics such as synchronous that realize with laser; Aspect the dynamic changing process of diagnosis pressurized material internal microstructure and the ultrafast process in the hot close material, have huge prospect, but how to increase x-ray source brightness, to reduce dimension of light source, improve the light source signal to noise ratio be current research emphasis to strengthen its diagnosis capability.
The scheme that generally adopts at present is (to consult document " Optimized K α x-ray flashes from femtosecond-laser-irradiatedfoils ", PHYSICAL REVIEW E80,026404 through laser irradiation surface foil target; 2009); Laser forms plasma with plane foil target surface atom ionization rapidly, and plasma and laser interaction produce high energy electron, and these high energy electrons make its inner-shell ionization produce the hole with the target atom collision in the process of target internal motion; Thereby give off X ray; Comprise K α, characteristic X-ray radiation such as K β, its wavelength is by the hypostracum energy level difference decision of atom.Except the characteristic X-ray radiation, high energy electron also can produce bremsstrahlung with the target atom collision.Because bremsstrahlung is a continuous spectrum, when carrying out the diagnostic test that the X ray unipotency is had relatively high expectations (for example X-ray diffraction),, need to reduce the noise that bremsstrahlung brings to diagnosing characteristic X-ray radiation such as K α usefully, K β.
The factor of two aspects is depended in the brightness of Laser Driven X-radiation, the one, and the gross energy of incident laser, the 2nd, laser energy is converted into the transformation efficiency of X-radiation.Because the size of dimension of light source is decided by the size of laser focal spot, under the prerequisite that does not increase the dimension of light source size, increases the laser gross energy and be equivalent to the raising laser power density.Therefore, in order to improve the brightness of Laser Driven x-ray source, need improve laser-X ray transformation efficiency and incident laser power density simultaneously.
When adopting the plane foil target; Target material is dropped to minimum to the absorption of X ray when making that electron energy obtains the most effectively utilizing; Have that optimal laser power density and corresponding best target are thick (consults document " Yield Optimization and Time Structure of Femtosecond LaserPlasma K α Sources " PHYSICAL REVIEW LETTERS 84; 4846,2000).When laser power density the time greater than optimum power intensity; The brightness of X-radiation is along with the increase of laser power density reduces on the contrary; Thereby make the brightness of X ray have a bottleneck; Be difficult to further raising (consulting document " Comparison of experimental and simulated K α yieldfor 400nm ultrashort pulse laser irradiation " PHYSICAL REVIEW E74,027401,2006).In order to improve the brightness of X ray, just need to break through this bottleneck, make optimal laser power density be improved.
In addition, another problem of plane foil target is that transformation efficiency is not high enough.The transformation efficiency that laser energy changes into X-radiation determines by two aspects, the one, in the plasma Electron absorption laser can the energy-absorbing coefficient, the 2nd, electronic kinetic energy changes into the efficient of X-radiation (useful characteristic X-ray).The energy-absorbing coefficient of electronics is by the decision of incident laser condition and target surfaces characteristic, can be through control laser prepulsing, increase the target material surface roughness even do mode such as various micro-structural processing on the target surface energy-absorbing coefficient is improved.Yet,, also have only quite limited high energy electron energy to change into X-radiation even plasma has absorbed all laser energies.When adopting the plane foil target,, tend to adopt thick target in order the most effectively to utilize high energy electron; And be to reduce the absorption of target material to X ray, then be partial to thin target.This two contradiction causes being difficult to the maximized X-radiation that changes into of electron energy.In order to improve the brightness of X ray, need to adopt can the more efficient use laser energy design, make laser-X ray transformation efficiency be improved.
The plane foil target also have a problem be X-radiation mainly concentrate on before the target with the target rear to, normal direction has maximum.Again since target before bremsstrahlung stronger, signal to noise ratio is not high, thus diagnostic mainly be the X ray of surface emissivity behind the target.This makes the restriction that receives spatial placement in the experiment only conveniently draw a beam X-ray and diagnoses.If can improve X-radiation space angle scope, then be hopeful to draw simultaneously the multi beam X ray and diagnose, improve diagnosis efficiency and ability greatly.
Summary of the invention
The objective of the invention is to overcome the difficulty of existing Laser Driven X-radiation implementation; A kind of design that can improve optimal laser power density and laser-X ray transformation efficiency simultaneously is provided; And increase X-radiation space angle scope, make that X-radiation brightness is enhanced, diagnosis efficiency and ability be improved.
Basic ideas of the present invention are: adopt the solid-cone target to replace the plane foil target; Make the transmission range of electronics obtain prolonging; And the transmission range of X ray the solid-cone target that goes out from the surface emissivity of solid-cone target dwindled greatly, thereby makes laser-X ray transformation efficiency and optimal laser power density all be improved.
Concrete technical scheme of the present invention is:
A kind of laser irradiation solid-cone target produces the device of X ray, comprises laser, vacuum chamber, is located on the vacuum chamber and the driving laser that matches with laser inlet, is loaded on the target assembly in the vacuum chamber and receives the device of X ray, it is characterized in that:
Target assembly is by solid-cone target and fixing being configured to of solid-cone target, and solid-cone target awl bottom surface is positioned near the driving laser inlet side, and solid-cone target awl point is positioned near device one side that receives X ray.
Further scheme is: between driving laser inlet and target assembly, focus lamp is housed.
Further scheme is: can pass through X-ray detector (for example CCD or X ray photographic film) and directly receive from the X ray of awl target emanation.
Further scheme is: the device that receives X ray is a sample cavity.
Further scheme is: in the sharp direction of awl pin hole is set, to obtain the little X ray point source of the angle of divergence, is used for diagnosing the sample of sample cavity.
Further scheme is: utilize the bent crystal that X-radiation is carried out menu and turns to, improving the monochromaticjty of X ray, and X ray is used for diagnosing the sample of sample cavity.
Further scheme is: diagnose same sample with multi beam X ray (X ray that for example utilizes the pin hole and the bent crystal to obtain simultaneously), through regulating X ray light path control diagnosis sequential.
The present invention utilizes laser irradiation solid-cone target bottom surface; The high energy electron that bottom surface plasma and laser interaction produce has long transmission range along the axis of cone (center line of solid-cone target) direction; And want much little relatively from the distance that the X ray that poppet surface radiates transmits target, thereby the loss of X ray is reduced.Therefore adopt the solid-cone target to avoid that the increase of the electronic transmission degree of depth causes the problem that the X ray loss increases in the foil target of plane, make the energy of high energy electron be used more effectively, can improve laser-X ray transformation efficiency and optimized electronic temperature.And electron temperature is by the decision of incident laser power density, so adopt the solid-cone target can improve optimal laser power density.Therefore, the solid-cone target can overcome the difficulty of plane foil target, can obtain the higher characteristic X-ray radiation of brightness.
In the axis of cone direction pin hole is set, it is little to obtain the angle of divergence, and brightness is high, the X-radiation that dimension of light source is little, experiments such as imaging of convenient realization low-angle and scattering.Near the characteristic radiation that this part X ray causes when being penetrated into the poppet surface from high energy electron and since penetration of electrons during to the surface kinetic energy greatly reduce, so bremsstrahlung at this moment is reduced, thereby the unipotency of X ray is better.
Because the X-radiation scope that Laser Driven solid-cone target produces is greater than the plane foil target; X ray intensity is about axis of cone symmetry; And brightness is high; Therefore conveniently draw the multi beam X ray on every side and repeatedly diagnose, can also utilize the bent crystal to make the X ray beam steering, and utilize optical path difference to regulate the physical process that sequential can be used for the multi beam X ray to diagnose sample synchronization diverse location, different diverse location constantly or difference moment same positions from cone.
Advantage of the present invention is:
1, adopts the solid-cone target to make optimal laser power density and laser-X ray transformation efficiency all be improved significantly, thereby make the total brightness of X-radiation improve 10 times at least.
2, can obtain small size, the X-radiation of small divergence angle in the sharp direction of awl.
3, the X-radiation scope that adopts the acquisition of solid-cone target is conveniently drawn the multi beam X ray and is repeatedly diagnosed greater than the plane foil target.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the contrast sketch map that solid-cone target and plane foil target produce X-radiation;
Fig. 3 is that the numerical simulation calculation high energy electron transmits the comparison diagram as a result that produces K α X-radiation in solid-cone target and plane foil target.
Solid line is the result of solid-cone target among Fig. 3, has adopted optimized electronic temperature 100keV, and best awl is high 200 microns; Dotted line is the radiation result of plane foil target, has adopted optimized electronic temperature 40keV, thick 14 microns of best target.Target material is Cu.
Among the figure:
1, laser; 2, vacuum chamber; 3, vacuum chamber molecular pump interface; 4, driving laser inlet; 5, focus lamp;
Target assembly: 601, solid-cone target, 602, the fixing support of solid-cone target;
Receive the device of X ray: 701, X-ray detector, 702, the bent crystal, 703, pin hole, 704, sample cavity;
801,802 is laser beam;
901,902,903,904 is the X ray light beam;
10, plane foil target.
A, solid-cone target axis mid point and plane foil target mid point, h, awl height, θ, cone-apex angle, the detection angle of β, detecting x-ray.φ, the K α x-ray photon number density that the every absorption erg-ten of electronics laser energy is produced when plasma energy-absorbing coefficient is 0.3, unit is number of photons/square micron, the distance that detector distance A is ordered is 1 millimeter.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further description:
Like Fig. 1; A kind of laser irradiation solid-cone target produces the device of X ray; Comprise laser 1, vacuum chamber 2, be located on the vacuum chamber 2 and the driving laser that matches with laser 1 inlet 4, be loaded on the device of focus lamp 5, target assembly and reception X ray in the vacuum chamber 2, it is characterized in that:
Target assembly is made up of the solid-cone target 601 and the fixing support 602 of solid-cone target, and solid-cone target 601 awl bottom surfaces are positioned near driving laser 4 one sides that enter the mouth, and solid-cone target 601 awl points are positioned near device one side that receives X ray.Laser 1 power density 10
17～10
19W/cm
2, focal spot is less than solid-cone target 601 base areas.
Wherein, focus lamp 5, fixedly the support 602 of solid-cone target and the device that receives X ray all are fixed on the optical table in the vacuum chamber 2 by routine.
Like Fig. 2, solid-cone target 601 high h are 200～300 μ m, 5 °～45 ° of taper angle theta.
According to radiodiagnosis the needs of wavelength are chosen the solid-cone target material, the K α of each element, K β characteristic radiation wavelength can be looked into data table related.As the X-ray wavelength is not had strict demand, the Cu target is selected in suggestion for use, can obtain higher transformation efficiency.Optimal laser power density and best awl high with laser pulse condition, target surface condition, and target material has substantial connection, tests in advance when therefore needing practical implementation.In order to improve the absorption coefficient of duplet laser ability, can do coarse processing on solid-cone target 601 surfaces.Support 602 is used for fixing solid-cone target 601 on the one hand, also plays a part to absorb transverse movement electronics and thermal effect on the other hand.Support 602 thickness are thin as far as possible, are advisable less than 1/4 of solid-cone target 601 height at least.In order to prepare conveniently, can select for use and solid-cone target 601 identical materials, as diagnosis is disturbed in the bremsstrahlung of selecting for use atomicity then can avoid high energy electron and the interaction of support 602 materials to produce far below the light material of solid-cone target 601.Can receive through X-ray detector 701 from the X ray of solid-cone target 601 surface emissivities; Perhaps turn to convenient and further utilize through 702 pairs of X ray of the bent crystal; Can pin hole 703 be set obtaining the little X ray of the angle of divergence in axis of cone direction, the X ray of drawing from pin hole and the bent crystal may be used to diagnose the sample the sample cavity 704.
The result who utilizes the numerical simulation program to calculate solid-cone target and plane foil target K α X-radiation sees Fig. 3.Hypothesis electronics energy-absorbing coefficient is 0.3 in the calculating, and incident laser can erg-ten.Detector 701 (see figure 2)s are apart from 1 millimeter of pinwheel A point, and ordinate is the K α x-ray photon number density that detector receives, and unit is number of photons/square micron, and abscissa is detection angle β.The result shows that the optimum that adopts the solid-cone target to obtain compares with the optimum of plane foil target, at same range sensing, higher photon number density is arranged, and radiation scope is wider.
Claims (5)
1. a laser irradiation solid-cone target produces the device of X ray; Comprise laser (1), vacuum chamber (2), be located at the device that vacuum chamber (2) driving laser last and that match with laser (1) entered the mouth (4), was loaded on simultaneously the target assembly in the vacuum chamber (2) and receives X ray, it is characterized in that:
Target assembly by solid-cone target (601) and fixedly the support of solid-cone target (602) constitute, and solid-cone target (601) awl bottom surface is positioned near driving laser inlet (4) one sides, solid-cone target (601) awl point is positioned near device one side that receives X ray.
2. laser irradiation solid-cone target according to claim 1 produces the device of X ray, it is characterized in that between driving laser inlet (4) and target assembly, focus lamp (5) being housed.
3. laser irradiation solid-cone target according to claim 1 produces the device of X ray, and the device that it is characterized in that receiving X ray is X-ray detector (701).
4. laser irradiation solid-cone target according to claim 1 produces the device of X ray, and the device that it is characterized in that receiving X ray is sample cavity (704).
5. laser irradiation solid-cone target according to claim 4 produces the device of X ray, it is characterized in that between target assembly and sample cavity (704), also being equipped with the pin hole (703) and/or the bent crystal (702).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100644734A CN102170086B (en) | 2011-03-15 | 2011-03-15 | Device for generating X rays by laser irradiation of solid cone target |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100644734A CN102170086B (en) | 2011-03-15 | 2011-03-15 | Device for generating X rays by laser irradiation of solid cone target |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102170086A CN102170086A (en) | 2011-08-31 |
| CN102170086B true CN102170086B (en) | 2012-07-11 |
Family
ID=44491115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100644734A Expired - Fee Related CN102170086B (en) | 2011-03-15 | 2011-03-15 | Device for generating X rays by laser irradiation of solid cone target |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102170086B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778294B (en) * | 2012-07-18 | 2015-08-05 | 中国工程物理研究院流体物理研究所 | Laser Driven produces two optical spectrum imaging devices of X-ray source |
| CN104735895A (en) * | 2013-12-20 | 2015-06-24 | 中国工程物理研究院激光聚变研究中心 | Laser plasma pulse positron source |
| CN110530907B (en) * | 2014-06-06 | 2022-05-17 | 斯格瑞公司 | X-ray absorption measurement system |
| CN110567997B (en) * | 2019-10-11 | 2024-07-12 | 中国科学院上海应用物理研究所 | Vacuum cavity assembly for scattering experiment station |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1364048A (en) * | 2001-09-14 | 2002-08-14 | 中国科学院上海光学精密机械研究所 | Laser plasma X-ray source |
| WO2005004555A1 (en) * | 2003-06-27 | 2005-01-13 | Commissariat A L'energie Atomique | Method and device for producing extreme ultraviolet radiation or soft x-ray radiation |
| CN101010993A (en) * | 2004-08-27 | 2007-08-01 | 原子能源局 | A method and apparatus for generating radiation or particles by interaction between a laser beam and a target |
| EP2113813A1 (en) * | 2008-04-29 | 2009-11-04 | ASML Netherlands B.V. | Radiation source and lithographic apparatus |
-
2011
- 2011-03-15 CN CN2011100644734A patent/CN102170086B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1364048A (en) * | 2001-09-14 | 2002-08-14 | 中国科学院上海光学精密机械研究所 | Laser plasma X-ray source |
| WO2005004555A1 (en) * | 2003-06-27 | 2005-01-13 | Commissariat A L'energie Atomique | Method and device for producing extreme ultraviolet radiation or soft x-ray radiation |
| CN101010993A (en) * | 2004-08-27 | 2007-08-01 | 原子能源局 | A method and apparatus for generating radiation or particles by interaction between a laser beam and a target |
| EP2113813A1 (en) * | 2008-04-29 | 2009-11-04 | ASML Netherlands B.V. | Radiation source and lithographic apparatus |
Non-Patent Citations (5)
| Title |
|---|
| R.J. Mason.Heating Mechanisms in Short-pluse Laser-Driven Cone Target.《Phys. Rev. Letters》.2006,第96卷035001. * |
| W.Lu et.al..Optimized Ka x-ray falshes from femtosecond-laser irradiated foils.《Phys. Rev. E》.2009,第80卷 * |
| XiaoYa Li et.al..Enhanced inner-shell x-ray emission by femtosecond-laser irradiation of solid cone target.《Phys. Rev. E》.2011,第83卷046404. * |
| 叶雁等.超短超强激光与金属靶作用产生硬X射线照相.《强激光与粒子束》.2008,(第08期), * |
| 阳庆国等.激光驱动X射线单色背光照相***优化设计.《强激光与粒子束》.2008,第20卷(第12期),1983-1988. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102170086A (en) | 2011-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102170086B (en) | Device for generating X rays by laser irradiation of solid cone target | |
| CN104617482A (en) | Laser micro-focus plasma K alpha radiation source | |
| CN108885263A (en) | With the duplicate 3D imaging based on LIDAR of variable pulse | |
| Khalenkov et al. | Experience of micro-heterogeneous target fabrication to study energy transport in plasma near critical density | |
| CN110308614B (en) | Method and apparatus for X-ray intensity correlated imaging | |
| EP2755557A2 (en) | Forward- and variable-offset hoop for beam scanning | |
| US9431206B2 (en) | X-ray generation tube, X-ray generation device including the X-ray generation tube, and X-ray imaging system | |
| Craxton et al. | Polar direct drive: Proof-of-principle experiments on OMEGA and prospects for ignition on the National Ignition Facility | |
| JP6104526B2 (en) | X-ray tube and X-ray CT apparatus | |
| CN104735895A (en) | Laser plasma pulse positron source | |
| Torrisi | Ion energy enhancement from TNSA plasmas obtained from advanced targets | |
| Martynenko et al. | Optimization of a laser plasma-based x-ray source according to WDM absorption spectroscopy requirements | |
| TW201103062A (en) | X-ray source comprising a field emission cathode | |
| Valdivia et al. | An x-ray backlit Talbot-Lau deflectometer for high-energy-density electron density diagnostics | |
| Ju et al. | Analysis of x-ray emission and electron dynamics in a capillary-guided laser wakefield accelerator | |
| CN204391491U (en) | A kind of laser Microfocus X-ray plasma K αradiographic source | |
| Ping et al. | Symmetry tuning and high energy coupling for an Al capsule in a Au rugby hohlraum on NIF | |
| CN218036511U (en) | X-ray photoelectron spectrometer | |
| CN113675060A (en) | Scanning electron microscope | |
| CN108633297A (en) | Searchlight for motor vehicle | |
| CN103077762B (en) | Electron ray source generation device and the method producing low dose rate electron ray | |
| US6678351B1 (en) | Laser radiography forming bremsstrahlung radiation to image an object | |
| JP2015513774A (en) | Electromagnetic scanning device for generating a scanning X-ray beam | |
| CN109935509A (en) | Multifocal X-ray tube and multiple focal spot x-ray source | |
| Zhao et al. | Characterizing the hohlraum radiation via one-end driven experiments |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20160315 |