CN104681378A - Liquid metal target supply during x-ray production - Google Patents
Liquid metal target supply during x-ray production Download PDFInfo
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- CN104681378A CN104681378A CN201510020687.XA CN201510020687A CN104681378A CN 104681378 A CN104681378 A CN 104681378A CN 201510020687 A CN201510020687 A CN 201510020687A CN 104681378 A CN104681378 A CN 104681378A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70033—Production of exposure light, i.e. light sources by plasma extreme ultraviolet [EUV] sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/12—Cooling non-rotary anodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2235/00—X-ray tubes
- H01J2235/08—Targets (anodes) and X-ray converters
- H01J2235/081—Target material
- H01J2235/082—Fluids, e.g. liquids, gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2235/00—X-ray tubes
- H01J2235/12—Cooling
- H01J2235/1204—Cooling of the anode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2235/00—X-ray tubes
- H01J2235/12—Cooling
- H01J2235/1225—Cooling characterised by method
- H01J2235/1262—Circulating fluids
- H01J2235/1275—Circulating fluids characterised by the fluid
- H01J2235/1279—Liquid metals
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Surgical Instruments (AREA)
- X-Ray Techniques (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses liquid metal target supply during x-ray production. A closed-loop circulation which is used for providing liquid metals to an interaction area is presented, in the interaction area, electron beams impact the liquid metals to generate x-ray. According to the invention, the pressures of the liquid metals are increased to at least 10 bar by using a high pressure pump (312). The pressurized liquid metals are then led to a nozzle (332) and are ejected into a vacuum chamber (330) in a manner of spatial continuous jet flow. After passing through the vacuum chamber, the liquid metals are collected in a collection container (334), and for example, the pressures of the liquid metals are increased to an inlet pressure which is suitable for the inlet of the high pressure pump by using an actuating pump (322). The invention also relates to a corresponding circulating system and an x-ray source provided with the circulating system.
Description
The application is the applying date is on April 3rd, 2009, and application number is 200980158566.4, and denomination of invention is the divisional application of the application of " supply of liquid metals target in X ray produces ".
Technical field
The present invention relates generally to liquid metals target, is specifically related to the use in electronic impact x-ray source.
Background technology
X ray produces conventionally by allowing electron beam clash into solid anodes target.But, the performance of x-ray source is limited in the thermal effect of anode.A kind ofly alleviate the solid anodes that the mode relating to the overheated problem of solid anodes target employs rotation.
The traditional method of the second guides electron beam into liquid anode target, such as with the form of the drop of freely falling body or stream.US 4 953 191 shows a kind of sinking of liquid-gallium that uses as the x-ray source of its anode, and it is straight substantially and usually has the tangential velocity of about 2.0m/s.It is overheated to consider, the power of such x-ray source will be subject to the matter quantitative limitation of the gallium transmitted by the stream time per unit flowed.The desirable attribute in space orientation normally source, and the speed thickening stream or increase it is not the mode that can be used for increasing mass flow.
Recently, proposed to use liquid jet as the aborning electric target of X ray.Such as, WO 02/11499 discloses and uses liquid jet as electron beam target to produce the method and apparatus of X ray or EUV radiation.Such x-ray source can comprise and being suitable for as anode, namely as the ground connection injection stream of the liquid metals of electron beam target.Due to its renewable character, such liquid metals injection stream can stand strong electron beam and clash into; As a comparison, the propagation velocity of injection stream can similar in appearance to or higher than traditional rotating anode tangential velocity.Although the part energy only having electron beam to carry is converted into, X-ray energy-it causes sizable excessive heat generation-these liquid jet x-ray sources to have the feature of excellent brightness, and it brings the benefit of the new formation method relating to time for exposure, spatial resolution and such as differ imaging.
But design can run and not have the liquid metals injection stream x-ray source owing to safeguarding the interruption produced to be a challenge within the lasting time.Such as, in former this x-ray source, operator needs to suspend the generation of X ray, to change or to recharge target supply container, or changes or recharge the container of propelling gas of the pressurization for generation of target injection stream.
Summary of the invention
Overall goal of the present invention is to provide the closed-loop system to interaction zone supply liquid metals, and wherein in described interaction zone, electron beam clashes into liquid metals to produce X ray.Imagination the present invention will be provided in due to maintenance or the running time of keeping in repair the prolongation must interrupted before X ray produces.
By introducing, background and some challenges of relating to the system for supplying liquid metals injection stream will be discussed briefly.
The x-ray source of the type mentioned comprises electron gun and for providing the system of stable liquid metals injection stream in vacuum chamber.The metal used preferably has the one of relatively low fusing point, such as indium, gallium, tin, lead, bismuth or its alloy.Electron gun can run according to cold field emission, thermal field emission, thermionic emission and principle like this.Heater and/or cooler, pressue device, jet nozzle and the container for collecting liquid metals at the end of injection stream can be comprised for providing the system of electronic impact target, namely liquid metals injection stream.Due to the interaction of electronics and liquid metals target, X-radiation produces at impingement region.The window with suitable transmissison characteristic allows the X ray produced like this to leave low-pressure cavity.In order to allow the continuous operation of equipment, need to get back self-interaction region the liquid metals in downstream, and reuse the liquid metals of withdrawal with closed loop.
On technological layer, find that supplying liquid metals injection stream in the mode of closed loop needs to bear potential weakness.Such as, the pressure change that the loss etc. of the fluctuation of the fluid level owing to being blocked by the movement of pump piston, the intermittent mechanical type of the solid pollutant be contained in liquid, in multiple parts of system and the even Extracting Ability of pump causes, the consistency of injection stream in speed, shape and thickness may not be gratifying.In some cases, the space that injection stream also may become before electron beam clashes into the point of injection stream is discontinuous and be decomposed into fragment or drop, its by cause for X ray produce complicated.
Metal leakage is another potential challenge of the closed-loop system for providing liquid metals injection stream.The result of leaking can be the outside that metal is lost to system forevermore, but also comprises the partially cured situation that can not arrive of metal in system.Such as, in the exit of nozzle with aerosol suspension may be produced in the position that liquid jet impinges upon the liquid comprised in collection container and drip.If the mist of such relative movement is deposited on the inwall of low-pressure cavity, it almost for good and all will be lost from cyclic process.Further, if low-pressure cavity is the pump vacuum chamber being suitable for vented gasses or its gas suspension particle constantly, a large amount of liquid can be discharged by this way from system.Finally, seal, pipeline and pump are all potential leak of liquid sources, and therefore become the weakness of circulation circuit.From the viewpoint of user, leakage can discharge potential toxic gas, the supplementary of the costliness of liquid is made to become necessary, shorten service intervals (time interval especially between clean X ray output window), reduce performance by damaging vibration condition, and usually make the x-ray source of association more be difficult to run continuous print a period of time.Overcome by the present invention and answer these challenges right.
According to an aspect of the present invention, therefore proposed here for the method for closed loop supply liquid metals to interaction zone, wherein electron beam clashes into liquid metals to produce X ray particularly by bremsstrahlung or characteristic line emission.The method comprises step below:
Use high-pressure pump, the pressure of the liquid metals be included in the Part I of closed loop circulating system is elevated at least 10 bar, preferably at least 50 bar or more.
The liquid metals of pressurization is directed to nozzle.Although will bear more negligible pressure losses of possibility in this context by any guiding of conduit, the liquid metals of pressurization will still arrive nozzle, preferably in 50 Palestine and Israels with the pressure in 10 Palestine and Israels.
Liquid metals enters vacuum chamber to produce liquid metals injection stream from nozzle ejection, and wherein interaction zone is positioned at this vacuum chamber.
The liquid metals sprayed is collected after by interaction zone in collection container.
In the flowing direction (namely, in the normal operation of system, the liquid metals flowed from collection container to high-pressure pump) in the Part II of the closed loop circulating system between collection container and high-pressure pump, the pressure of the liquid metals of collection is lifted to the suction side pressure (inlet pressure) of high-pressure pump.The inlet pressure of high-pressure pump is at least 0.1 bar, is preferably at least 0.2 bar, to provide the reliable and stable operation of high-pressure pump.
Then above-mentioned steps-in other words is usually repeated continuously, the liquid metals with inlet pressure is supplied to high-pressure pump again, its pressurize again it at least 10 bar etc.-so that with continue, the mode of closed loop is implemented to the supply of the liquid metals injection stream of interaction zone.
High-pressure pump for the liquid metals adding the high-pressure section being pressed in circulation circuit comprises special high voltage device, to allow to produce sizable pressure difference in its suction side with release side.Pump can be without closed type particularly, to reduce the risk of leaking.Dynamic seal (packing), such as slipper seal or rotary seal, known really responsive especially to high-pressure leakage.This can cause the stable leakage of fluctuation of pressure (because the tightness of dynamic seal (packing) may change along with its physical location) and liquid.In the background of the invention, unprssurized pump, such as membrane pump, compare the pump with dynamic seal (packing) and be more preferably.
The pressure raising the liquid metals collected ensure that to the step of enough inlet pressure and the good service conditions of high-pressure pump enables it supply stable high pressure to nozzle and protect it not lose its inlet capacity.Preferably, liquid metals injection stream is at least 10m/s by the propagation velocity of vacuum chamber.Produce liquid metals injection stream so that this injection stream is by spatially continuous for the position of clashing into metal jet stream at electron beam.But, it should be noted that the decomposition of injection stream is normally acceptable beyond the position that electron beam clashes into target injection stream, because such later stage of injection stream decomposes the generation not affecting X ray in any relevant degree; The possibility of such decomposition does not affect the size of nozzle.
Liquid metals pressure is from vacuum pressure until the rising of inlet pressure can by collecting the liquid of injection and using the passive realization of gravitational field in container, and this container has such layout: the hydrostatic that suitable amplitude at least supplied by the liquid metals post in its bottom in running is pressed onto the suction side of high-pressure pump.Alternatively, container can be substantially smooth, but passes through in gravitational field to the tubes connection of the liquid filling (in running) of downward-extension to high-pressure pump.Therefore, relative to collection container, the position of high-pressure pump in gravitational field should be lower in this example, and provide enough high-pressure pump inlet pressure stable state running in, the part at least between these (at flow directions) connects comprise liquid metals.
Enough inlet pressure can also be provided on one's own initiative, such as, by arranging the mode starting pump between collection container and high-pressure pump, with the suction side of the liquid metals to the latter that provide pressurization.
It should also be understood that the inlet pressure of high-pressure pump can use the combination of gravitational field and startup pump to obtain.
As formerly explained, X ray generative process creates the excessive heat of sizable amount.High temperature can the corrosion of accelerating system and the deterioration of other types.In order to remove the excessive heat from liquid metals, can cooler be equipped, being such as thermally connected to the refrigeration coil of collection container, be suitable for the excessive heat by electron beam transmission to be discharged into outside the circulatory system.Such cooler can run with the speed proportional with the actual strength of electron beam, and object keeps being included in the set point temperatures of the liquid metals in the circulatory system in appropriateness, such as slightly higher than the fusing point of metal under discussion.But, should be appreciated that the different piece along with closed loop circulating system changes by the temperature of liquid metals.
In general, can control by application of temperature.Except remove the excessive heat that produced by electronic impact with avoid the corrosion of sensitive components in system and overheated except, the liquid metals of other parts of heating system may be needed.There is the metal of higher melt and the heating power supplied by electron beam is not enough to the liquid condition that keeps this metal at it in the entire system if used, then may need heating.About special inconvenience, if temperature drops to below critical value, the splashings clashing into the liquid metals of the internal partial wall of collection container may solidify and disappear from the liquid circulation loop of system.If there is large outside hot-fluid in running, also may need heating, if such as confirm the some parts being difficult to thermal insulation system.It is also understood that if the metal used is not liquid under typical ambient temperature, is then need heating when starting.
The interaction zone producing X ray is provided in vacuum chamber.For the generation of X ray in the background of the invention, preferably need at the most 10
-3the pressure of millibar.Lower pressure requires mainly due to electron beam system.For some elaborate electron beam systems, higher vacuum pressure may be accepted.
In the execution mode with advantage, the method also comprises the pressure pulse that attenuating high pressure pump may excite in liquid metals.The medium of known many displacement-type pumps-comprise single head or bull piston pump and membrane pump-do not discharge in a continuous manner pressurization, and this is to provide the obstacle of uniform liquid metals injection stream.The pulse attenuator of suitable type can be used to realize the decay of pressure pulse.Such as, attenuator can be diaphragm accumulator, bladder accumulator or piston accumulator.Diaphragm accumulator can comprise can by a large amount of gases of the pressure pulse compression in liquid metals.The liquid metal contacts simultaneously comprised in its opposite side and system after then gas be enclosed barrier film usually.Gas can also be provided in the top closed of the vertical tube that part liquid metals is filled and freely communicate with the remainder of system.Alternatively, attenuator can be the sweep of the conduit connecting high-pressure pump and nozzle in the flowing direction, and it is suitable for elastic bending and absorption pressure hard pulse.Also it is contemplated that the pressure pulse attenuator of other types.
Metal in the current situation, it distributes in the vacuum chamber with the form of steam, mist and splashings, and many x-ray sources comprising liquid target suffer the pollution of the residue sent from target to a certain extent.In order to reduce the generation of such residue, the favourable execution mode of method of the present invention provides the collection of liquid metals by the surface allowing injection stream shock tilt.Any splashings to be opened and towards collection container from vacuum chamber deflection by the surface tilted.
In some realizations of system of the present invention, can by one or more filter in liquid metals cyclic process in systems in which.Such as, relatively thick filter can be arranged on normal flow direction between collection container and high-pressure pump, and relatively thin filter can be arranged on normal flow direction between high-pressure pump and nozzle.Thick can individually or be combined with thin filter.As long as solid pollutant was captured and removes from circulation before they damage other parts of system, the execution mode comprising the filtration of liquid metals has superiority.
According to a second aspect of the invention, the circulatory system for producing supply liquid metals electric target for X ray is provided.Additionally provide the x-ray source comprising such circulatory system.
According to the present invention, provide a kind of for the method for closed loop supply liquid metals to interaction zone, in described interaction zone, electron beam clashes into described liquid metals to produce X ray, said method comprising the steps of:
High-pressure pump is used to raise the pressure of the described liquid metals in the Part I of closed loop circulating system at least 10 bar;
Guide the described liquid metals of at least 10 bar pressure to nozzle;
To produce liquid metals injection stream from liquid metals to vacuum chamber described in described nozzle ejection, described interaction zone is arranged in described vacuum chamber;
Sprayed liquid metals is collected in collection container;
In the Part II of the described collection container on the flow direction being located at described liquid metals and the described closed loop circulating system between described high-pressure pump, the pressure of the liquid metals collected by rising is to the inlet pressure being suitable for described high-pressure pump, and described inlet pressure is at least 0.1 bar; With
Repeat step above to realize the closed loop supply of liquid metals to described interaction zone.
The described step using described high-pressure pump to raise described pressure can comprise the described pressure of rising at least 50 bar.
Described pressure can be lifted at least 100 bar.
Described inlet pressure can be at least 0.2 bar.
In described liquid metals injection stream by described vacuum chamber from described nozzle until described electron beam will clash into the communication process of the position of described liquid metals injection stream, described liquid metals injection stream can be spatially continuous.
Collected liquid metals can be cooled, to remove the excessive heat produced by the interaction of described electron beam and described liquid metals injection stream.
Described liquid metals can be cooled to the temperature of less than 150 DEG C.
Spray the described step that described liquid metals enters described vacuum chamber to be performed so that described liquid metals injection stream is in the propagation velocity by having at least 10m/s during described vacuum chamber.
Pressure in described vacuum chamber can lower than 10
-3millibar.
Described method also can comprise the step of the pressure pulse in the described liquid metals of decay in the described Part I of described closed loop circulating system.
The step of collecting described liquid metals in described collection container performs by allowing sprayed liquid metals impact the surface tilted, to reduce the pollution to described vacuum chamber caused by liquid metals splash, mist and thing like this from described collection container.
Described liquid metals injection stream can be passed in the narrower bore in the outlet between described vacuum chamber and described collection container.
Described method also can be included in described liquid metals makes described liquid metals by the step of coarse filter from described collection container to the passage of described high-pressure pump.
Described method also can be included in described liquid metals makes described liquid metals by the step of fine filtrator from described high-pressure pump to the passage of described nozzle.
The pressure of the liquid metals collected by rising can comprise to the step of described inlet pressure makes the position of described high-pressure pump in gravitational field lower than described container.
The pressure raising the liquid metals of described collection can comprise using to the step of described inlet pressure and starts pump.
According to the present invention, additionally provide a kind of for supplying the closed loop circulating system of liquid metals to interaction zone, in described interaction zone, electron beam clashes into described liquid metals to produce X ray, and described system comprises:
High-pressure pump, it is connected to the first side of the high-pressure section of the described circulatory system;
Nozzle, it is connected to the second side of the described high-pressure section of the described circulatory system;
Vacuum chamber, it is for receiving the liquid metals of the injection stream form from described nozzle ejection;
Collection container, it is for collecting by the later described liquid metals of described vacuum chamber; With
Device, between its described vacuum chamber in the described circulatory system and described high-pressure pump, for raising the pressure of described liquid metals at least 0.1 bar, to provide the inlet pressure of described high-pressure pump;
The pressure of the described liquid metals wherein in the described high-pressure section of the described circulatory system is at least 10 bar.
The pressure of the described liquid metals of the described high-pressure section of the described circulatory system can be at least 50 bar.
The pressure of the described liquid metals of the described high-pressure section of the described circulatory system can be at least 100 bar.
Described inlet pressure can be at least 0.2 bar.
The described circulatory system can be configured to the liquid metals from described nozzle ejection spatially continuous print injection stream form, and the liquid metals of described injection stream form is by having the propagation velocity of at least 10m/s during described vacuum chamber.
The described circulatory system also can comprise cooler, and this cooler can be used for removing the excessive heat deposited in described metal by described electron beam.
Pressure in described vacuum chamber can lower than 10
-3millibar.
The described circulatory system also can comprise attenuator, and this attenuator can be used for the pressure pulse in described liquid metals caused by described high-pressure pump that decays.
The described circulatory system also can comprise the surface of inclination, in liquid metals injection stream by after described vacuum chamber, this liquid metals injection stream clashes into the surface of described inclination, and the surface of described inclination can be designed to the formation of the residue from described liquid metals be reduced in described vacuum chamber.
The described circulatory system also can be included in the hole in the outlet of described vacuum chamber, and described hole can be designed and be configured to reduce residue enters described vacuum chamber risk from described collection container.
The described circulatory system also can comprise one or more filter for removing fume from the liquid metals of circulation.
Pressure for raising described liquid metals provides the described device of the inlet pressure of described high-pressure pump can have the form starting pump at least 0.1 Palestine and Israel.
According to the present invention, still further provides and a kind ofly comprise electron source and the x-ray source according to closed loop circulating system as above.
Accompanying drawing explanation
Embodiments of the present invention are described in detail, wherein referring now to accompanying drawing
Fig. 1 is the flow chart of the method for closed loop supply liquid metals according to the embodiment of the present invention;
Fig. 2 is used to and clashes into by electron beam the diagram general view that generation X ray provides the circulatory system of the present invention of liquid metals target;
Fig. 3 schematically shows the interchangeable execution mode of the circulatory system of general view in fig. 2;
Fig. 4 schematically shows first of liquid metals collection container and realizes;
Fig. 5 schematically shows second of liquid metals collection container and realizes; With
Fig. 6 schematically shows according to the x-ray source comprising the closed loop circulating system of liquid metals of the present invention.
In the accompanying drawings, same part or details are generally indicated by same reference symbol all the time.
Embodiment
Referring now to Fig. 1, the method 100 for closed loop supply liquid metals according to presently preferred embodiments of the invention is described.In order to the clear of this open scheme and succinct, this method will be described according to " step ".Should emphasize, " step " needs not to be and separates in time and process separated from one another, and can perform at one time in a parallel fashion more than one " step ".The viewpoint that this open scheme is intended to is " step " express liquid at it by being suitable for the different process experienced in the process in the loop of the circulatory system performing the method.
In step 110, the pressure of liquid metals is lifted to high pressure.Once liquid metals injection stream is incident from nozzle, high pressure is enough to make it obtain high propagation velocity in the vacuum chamber.Normally, high pressure will be at least 10 bar, preferably at least 50 bar and until more than 100 bar.According to Fig. 3, pressurized liquid metals is contained in closed loop circulating system 300, and closed loop circulating system 300 comprises high-pressure pump 312, is preferably membrane pump or other high-pressure pumps.Pump constitutes the transition of the Part I 310 (high-pressure section) of the circulatory system 300.
In step 112, the liquid metals of pressurization is directed to nozzle 332 by the high-pressure section 310 of system 300.Therefore, the high-pressure section 310 of the circulatory system is between high-pressure pump 312 and nozzle 332.In step 112, the process that the liquid metals of pressurization transmits from pump 312 to nozzle 332 at it, some pressure will be lost, but its pressure keep enough high so as metal with at least 10 bar and usually the sufficiently high pressure of at least 50 bar arrive nozzles.In the present embodiment, the liquid metals of pressurization passed through optics fine filtrator 316 before it arrives nozzle 332.Fine filtrator 316 can provide with the form of stainless steel sift or several continuous screen.
Depend on the character of high-pressure pump 312, the pressure pulse propagated in the liquid metals of pressurization may produce as the side effect of pressurization.Such pressure pulse can in optional third step 114, and the attenuator 318 that being used in the Part I of system (before fine filtrator 316 or afterwards) provides is decayed.Attenuator can comprise film, and this film makes a large amount of gas (N such as compressed
2) be enclosed in after it.When pressure pulse arrives attenuator 318, the pressure of hydraulic fluid side increases, and film extends and extrudes gas.Due to pressure fall after rise, gas expand into it again before volume.In fact, any residual impulse propagated towards nozzle 332 forward by attenuator 318 has the amplitude of reduction.For the purpose of Fig. 3 is clear, depict the connecting line of Part I 310 from the circulatory system and attenuator 318.But, the attenuator of similar kind can at the Part I 310 of system directly, arranged in series, and/or this attenuator has the form of the run of expansion, this run has as described above by the elastic film as wall of the gas volume support of compression.In the execution mode needing stronger decay, multiple attenuator can be provided at Part I 310.
In step 116, liquid metals is sprayed by nozzle 332 and enters vacuum chamber 330.Then stable (spatially continuous print) liquid metals injection stream can be used as the target of the electron beam (not shown) in this chamber 330.Electron beam clashes into liquid metals at interaction zone (not shown), and portions of electronics beam energy is converted into X ray.The jet hole used has such shape and size, so that the liquid metals sprayed presents the form of physically continuous print injection stream.Injection stream will trend towards being relaxed to the state of lower surface energy and usually change its shape thus.As explained above, injection stream clashes into the discontinuous part being decomposed into spraying, drop or other types beyond the point of metal jet stream at electron beam, this can tolerate, because any impact that such later stage decomposes on X ray produces is negligible.Similarly, the shape of opposing jet is had very little impact by gravity, and this injection stream need not be parallel with gravitational field.Suitably, nozzle is sapphire plate or ruby plate, provides cylindrical hole or bellmouth by it.The diameter in hole can with the thickness of plate at the identical order of magnitude.The shape of nozzle should the generation of minimum liquid metal mist, and it may pollute vacuum chamber 330.Consider the Production conditions of optional X ray, the cross section of the injection stream of expectation can be adopted as the starting point of demarcating jet size.In preferred realization, liquid metals is about 100 bar at the pressure at nozzle place.Nozzle has the jet of diameter 100 μm, and it is similar to the wall thickness of sapphire nozzle.Suitable electron beam for clashing into liquid metals injection stream has the focus of about 20 μm of diameters and the power of about 200W.After reading and understanding current disclosed content, technical staff finds suitable parameter by according to conventionally calculation and experiment.
In step 118, the liquid metals of injection is collected in collection container 334.As discussed above, liquid metals may need cooling to avoid the overheated of system.Usually, the temperature of liquid metals in a reservoir preferably should remain on fusion temperature temperature above a little, and can change along with the function of the thermal endurance of the thermal insulation of the metal species of the fusing point of metal, use, system 300 and its component.Cooling can be realized by heat transfer circuit 336, and excessive hot H is discharged to beyond system by it.If the heat transfer between outside container 334 and system is very large, passive heat transfer circuit can provide enough coolings.If need stronger cooling, people can use the active refrigeration comprising compression coolant.In a preferred embodiment, the water-cooled aluminium block being fixed on container and/or conduit is used to realize cooling.
In order to reduce the pollution of vacuum chamber 330, take measures so that the collection of liquid metals injection stream produces the least possible residue.Verified, if flow to into collection container 334 by the surperficial guiding fuel injection tilted, then liquid metals collection with rule, non-confusion and be not that the mode of very splash is carried out.In the running of the stable state of the circulatory system 300, the surface of inclination can be the inwall of container 334 or the plate close to liquid metals surface layout.Use with metal jet stream is that the surface of 45 degree or less angular slope achieves best residue and stops result.The surface tilted can be precipitous as 10 degree or less angle.In addition, liquid metals surface can be included the screen cloth covering of the ingate of injection stream; Such screen cloth is suitable for the drop of catching mist and splash, and stops these to pollute vacuum chamber 330.
As another step 120, in order to the condition of work provided for high-pressure pump 312, the pressure of the liquid metals of collection is lifted to the inlet pressure of high-pressure pump.This step occurs in the Part II 320 of the system 300 between collection container 334 and the suction side of high-pressure pump 312.In this embodiment, the startup pump 322 that is raised through of pressure realizes effectively.For the high-pressure pump of the diaphragm metering pump form such as used in a preferred embodiment, the inlet pressure of high-pressure pump should be at least 0.1 bar, preferably at least 0.2 bar.
Thick mechanical filter 324, such as stainless steel filter, can be optionally provided in the upstream starting pump 322, protects it to avoid the pollution of potential harmful solid pollutant.
Liquid metals again by high-pressure pump 312 be pressurized at least 10 bar time, it in system 300 from completing loop.Above-described step will repeat now in a continuous manner, to realize the stable supply of liquid metals to interaction zone in closed-loop system.
A kind of preferably for the metal in method be above Ga and 5wt% comprising 95wt% In, there is the alloy of the fusing point of 25 DEG C and the solidifying point of about 16 DEG C.Other metals that can expect used in the method are Galinstan
tMit is In and 10wt% of Ga, the 21.5wt% comprising 68.5wt% Sn, there is the approximately fusing point of-19 DEG C and the alloy of solidifying point, comprise the Bi of In and 34wt% of 66wt%, there is the fusing point of about 72 DEG C and the alloy of solidifying point, and there is the fusing point of about 157 DEG C and the pure In of solidifying point.
Below, be specially Fig. 3, Fig. 4 and Fig. 5 with reference to the accompanying drawings to describe in detail according to device of the present invention.
Device according to the form of the closed loop circulating system 300 of liquid metals of the present invention schematically shows in figure 3 as block diagram.This device comprises vacuum chamber 330, and electron beam (not shown) strikes in liquid metals target injection stream to produce X-radiation by bremsstrahlung and characteristic line emission wherein.There is provided nozzle 332 to produce liquid metals target injection stream at vacuum chamber.Nozzle may be operably coupled to high-pressure pump 312 by pipeline or conduit system.The part 310 of the closed loop circulating system between nozzle and high-pressure pump forms high-pressure section (Part I), and the liquid metals pressurizeed wherein transmits to spray as liquid metals target injection stream to nozzle 332.At the high-pressure section 310 of the circulatory system, attenuator 318 can be provided alternatively.The object of this attenuator 318 is any pressure pulse caused by high-pressure pump 312 be reduced in pipe-line system, to produce level and smooth and continuous print liquid metals target injection stream at nozzle 332.In addition, the high-pressure section 310 of the circulatory system can comprise filter, such as at the fine filtrator of 316 instructions, to eliminate the fine particle that may block or hinder nozzle 332 in addition.
High-pressure pump 312 works from the Part II 320 of closed loop circulating system, and wherein the pressure of liquid metals is significantly lower than the pressure of high-pressure section 310.At the entrance side of high-pressure pump, the pressure of liquid metals should have suitable inlet pressure.There is provided at the Part II of the circulatory system and start pump 322 so that the pressure of liquid metals is elevated to suitable inlet pressure from the low pressure occurred at vacuum chamber.Usually, be at least 0.1 bar at the inlet pressure of the entrance side of high-pressure pump, more preferably at least 0.2 bar.High-pressure pump 312 is connected to collection container 334 by the Part II of pipe-line system 320.After being sprayed with the form of target injection stream by nozzle 332, and by after vacuum chamber, collect liquid metals for further recirculation at collection container 332, and start pump 322 and raise the applicable inlet pressure of its pressure to high-pressure pump 312.In interchangeable execution mode, as shown in Figure 2, if provide the additive method of elevated pressure to the inlet pressure be applicable to of high-pressure pump 312, can exempt and start pump 322.Such as, by can obtain enough inlet pressure of high-pressure pump 212 at the location arrangements high-pressure pump 212 causing liquid metals post to present above pump 212.In other words, high-pressure pump 212 is arranged lower than collection container 234 in gravitational field, and the hydrostatic pressing caused by liquid metals post provides enough inlet pressure.
Optional filter can be provided, such as coarse filter 324, to eliminate the particulate pollutant in liquid metals in the fluid passage of the liquid metals between collection container 334 and high-pressure pump 312.
When electron beam is in vacuum chamber inner impact liquid metals target injection stream, a large amount of heat deposition is in liquid metals.In order to remove excessive heat, the cooling system 336 be connected with collection container can be provided.In a preferred embodiment, cooling system comprises the water cooling block that one or more is fixed on the pipe-line system near collection container.Water cooling block can be the aluminium block of the passage with cooling water.
Be presented above some examples of applicable metal.The temperature of the metal in closed loop circulating system controls to be that the fusing point preferably making the temperature of metal remain on slightly higher than metal under discussion realizes.Certainly, the temperature of metal will be quite high after it just interacts with electron beam, until after the cooling system be connected with collection container works.But for other parts of the circulatory system, the temperature of metal preferably remains on medium level.Metal temperature is kept to be that metal can to become at high temperature and has aggressiveness to other parts of pipeline material and system in a reason of medium level.
Should also be noted that some metals used may need at some parts supply heat to keep metal for liquid state in the running in system always related to the present inventionly.Such as, this may mean and can add heater at the high-pressure section of the circulatory system.In addition, when the metal used is not liquid at environment (indoor) temperature, often need heat supply in the start-up course of system.
Fig. 4 and Fig. 5 is two examples that how can realize liquid metals collection.It should be noted that Fig. 4 and Fig. 5 is high-level schematic, and general principle is just described.In figures 4 and 5, liquid metals injection stream is schematically indicated by downward arrow.
As described above, the formation of the residue (splash, mist etc.) avoided or be reduced in vacuum chamber should be taken measures when collecting liquid metals injection stream.For this purpose, provide the surface of inclination, it was clashed into by liquid metals injection stream before liquid metals is collected.In one embodiment, as schematically shown in the diagram, the surface of inclination and collection container are parts for pipe-line system.In the embodiment illustrated in fig. 4, the outlet of design vacuum chamber, so that liquid metals injection stream penetrates vacuum chamber by opening 410, to be advanced a segment distance by the straight drum part of outlet conduit 415, and the final sloping portion 420 clashing into pipeline.Thus, spray, risk that mist or other residues return vacuum chamber 330 is considerably reduced.In order to be reduced in the risk of the residue in vacuum chamber further, the outlet 410 of vacuum chamber can equip hole, to be reduced in the physically opening between vacuum chamber and pipeline.In this case, collection container 334 is made up of, as indicated in the diagram the comparatively lower part of the outlet conduit of vacuum chamber.
As an alternative, as schematically shown in Figure 5, the straight drum part 415 of pipeline can be positioned at the general area of vacuum chamber.Also can imagine, collection container has the form of vessel.If pipeline itself or vessel lack the surface striking the inclination naturally on it for liquid metals injection stream after it is by the passage of vacuum chamber, can provide the surface of this inclination with plate or circular cone or similar form, it also schematically shows in Figure 5.
The invention still further relates to x-ray source, it comprises the closed loop circulating system of liquid metals recited above.Such x-ray source schematically shows in figure 6.Except closed loop liquid metal circulation system 300, x-ray source 600 also comprises the electron source 610 for generation of electron beam 612.Electron beam and liquid metals injection stream interact and produce X-radiation preferably by bremsstrahlung and characteristic line emission.As indicated by arrow 614, the X-radiation of generation is propagated to X-ray window 616, by this window 616, and X ray injection vacuum chamber 330.In figure 6, the vacuum chamber surrounding the circulatory system 300 and electron beam source 610 is shown.But, may be preferably make some pipelines of such as circulating pump and liquid metals beyond vacuum chamber.In addition, electron source 610 just schematically shows very much, and will usually make some parts be positioned at beyond vacuum chamber in any realization.
Claims (15)
1. supply the method (100) of liquid metals to interaction zone for closed loop for one kind, in described interaction zone, electron beam clashes into described liquid metals to produce X ray, said method comprising the steps of:
High-pressure pump is used to raise the pressure of (110) described liquid metals in the Part I of closed loop circulating system at least 10 bar;
Guide the described liquid metals of (112) at least 10 bar pressure to nozzle;
To produce the liquid metals injection stream propagated by described vacuum chamber with the speed of 10m/s or larger from described nozzle ejection (116) described liquid metals to vacuum chamber, described interaction zone is arranged in described vacuum chamber;
The liquid metals (118) sprayed is collected in collection container;
Raise the pressure of the liquid metals collected by (120) to the inlet pressure being suitable for described high-pressure pump, described inlet pressure is at least 0.1 bar; With
Repeat step above to realize the closed loop supply of liquid metals to described interaction zone;
It is characterized in that, described collection container is provided with the surface (420) of the inclination that described liquid metals injection stream is clashed into, to reduce from the liquid metals splashings of described collection container, mist and analog the pollution of described vacuum chamber, and described liquid metals from described collection container to the passage of described high-pressure pump and/or described liquid metals from described high-pressure pump to the passage of described nozzle, described liquid metals is by least one filter (316,324).
2. the method for claim 1, the pressure wherein raising collected liquid metals comprises using to the step of described inlet pressure and starts pump (322).
3. the method for claim 1, the pressure wherein raising collected liquid metals comprises to the step of described inlet pressure makes the position of described high-pressure pump in gravitational field lower than described container.
4. method as claimed in claim 1 or 2, is also included in described liquid metals and makes described liquid metals by coarse filter (324) from described collection container to the passage of described high-pressure pump.
5. method as claimed in claim 1 or 2, is also included in described liquid metals and makes described liquid metals by fine filtrator (316) from described high-pressure pump to the passage of described nozzle.
6. the method according to any one of claim 1 and 2, also comprises the step of the pressure pulse in the described liquid metals of decay (114) in the described Part I of described closed loop circulating system.
7. the method according to any one of claim 1 and 2, wherein said liquid metals injection stream is passed in the narrower bore in the outlet between described vacuum chamber and described collection container.
8. one kind for supplying the closed loop circulating system (200 of liquid metals to interaction zone; 300), in described interaction zone, electron beam clashes into described liquid metals to produce X ray, and the described circulatory system comprises:
High-pressure pump (212; 312), it is connected to the high-pressure section (210 of the described circulatory system; 310) the first side;
Nozzle (232; 332), it is connected to the described high-pressure section (210 of the described circulatory system; 310) the second side;
Vacuum chamber (230; 330), it is for receiving from described nozzle (232; 332) liquid metals of the injection stream form of spraying, wherein said injection stream is propagated by described vacuum chamber with 10m/s or larger speed;
Collection container (234; 334), it is for collecting by the later described liquid metals of described vacuum chamber; With
Be located at the device between the described vacuum chamber of the described circulatory system on the flow direction of described liquid metals and described high-pressure pump, for raising the pressure of described liquid metals at least 0.1 bar, to provide the inlet pressure of described high-pressure pump,
The pressure of the described liquid metals wherein in the described high-pressure section (310) of the described circulatory system (300) is at least 10 bar;
It is characterized in that, described collection container is provided with the surface (420) of the inclination that described injection stream is clashed into, to reduce from the liquid metals splashings of described collection container, mist and analog the pollution of described vacuum chamber, and the feature of the described circulatory system is at least one filter (316,324) for removing fume from the liquid metals of circulation.
9. the circulatory system as claimed in claim 8, wherein have the form of the liquid column above described high-pressure pump to the described device of at least 0.1 bar for the pressure that raises described liquid metals, the position of described high-pressure pump in gravitational field is lower than described collection container.
10. the circulatory system as claimed in claim 8, the pressure wherein for raising described liquid metals to have the form of startup pump (322) to the described device that at least 0.1 clings to.
11. circulatory systems as claimed in claim 8 or 9, also comprise attenuator (318), this attenuator is for the pressure pulse in described liquid metals caused by described high-pressure pump that decays.
12. circulatory systems according to any one of claim 8-9, are also included in the hole in the outlet of described vacuum chamber, and described hole is designed and is configured to reduce residue enters described vacuum chamber risk from described collection container.
13. circulatory systems according to any one of claim 8-9, wherein fine filtrator (316) is arranged between described high-pressure pump and described nozzle on the flow direction of described liquid metals.
14. circulatory systems according to any one of claim 8-9, wherein coarse filter (324) is arranged between described collection container and described high-pressure pump on the flow direction of described liquid metals.
15. 1 kinds comprise electron source (610) and according to Claim 8-9 the x-ray source (600) of closed loop circulating system of any one.
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| CN201510020687.XA CN104681378B (en) | 2009-04-03 | 2009-04-03 | Liquid metal target supply during x-ray production |
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| CN200980158566.4A CN102369587B (en) | 2009-04-03 | 2009-04-03 | Supply of a liquid-metal target in x-ray generation |
| CN201510020687.XA CN104681378B (en) | 2009-04-03 | 2009-04-03 | Liquid metal target supply during x-ray production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016217423A1 (en) | 2016-09-13 | 2018-03-15 | Siemens Healthcare Gmbh | anode |
| CN110574138A (en) * | 2017-04-05 | 2019-12-13 | 伊克斯拉姆公司 | Vapor monitoring |
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| US4953191A (en) * | 1989-07-24 | 1990-08-28 | The United States Of America As Represented By The United States Department Of Energy | High intensity x-ray source using liquid gallium target |
| US5991360A (en) * | 1997-02-07 | 1999-11-23 | Hitachi, Ltd. | Laser plasma x-ray source, semiconductor lithography apparatus using the same and a method thereof |
| CN1466860A (en) * | 2000-07-28 | 2004-01-07 | Method and apparatus for generating X-ray or EUV radiation | |
| CN1943001A (en) * | 2004-04-13 | 2007-04-04 | 皇家飞利浦电子股份有限公司 | A device for generating x-rays having a liquid metal anode |
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| US4953191A (en) * | 1989-07-24 | 1990-08-28 | The United States Of America As Represented By The United States Department Of Energy | High intensity x-ray source using liquid gallium target |
| US5991360A (en) * | 1997-02-07 | 1999-11-23 | Hitachi, Ltd. | Laser plasma x-ray source, semiconductor lithography apparatus using the same and a method thereof |
| CN1466860A (en) * | 2000-07-28 | 2004-01-07 | Method and apparatus for generating X-ray or EUV radiation | |
| CN1943001A (en) * | 2004-04-13 | 2007-04-04 | 皇家飞利浦电子股份有限公司 | A device for generating x-rays having a liquid metal anode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016217423A1 (en) | 2016-09-13 | 2018-03-15 | Siemens Healthcare Gmbh | anode |
| US10535489B2 (en) | 2016-09-13 | 2020-01-14 | Siemens Healthcare Gmbh | Anode |
| DE102016217423B4 (en) | 2016-09-13 | 2022-12-01 | Siemens Healthcare Gmbh | anode |
| CN110574138A (en) * | 2017-04-05 | 2019-12-13 | 伊克斯拉姆公司 | Vapor monitoring |
| CN110574138B (en) * | 2017-04-05 | 2022-01-07 | 伊克斯拉姆公司 | Vapor monitoring |
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| CN104681378B (en) | 2017-04-12 |
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