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189 results about "Plasma channel" patented technology
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A plasma channel is a conductive channel of plasma. A plasma channel can be formed in these ways...
Plasma Immersion Chamber
Embodiments described herein generally provide a toroidal plasma source, a plasma channeling device, a showerhead, and a substrate support assembly for use in a plasma chamber. The toroidal plasma source, plasma channeling device, showerhead, and substrate support assembly are adapted to improve the usable lifetime of the plasma chamber, as well as reduce assembly cost, increase the plasma chamber reliability, and improve device yield on the processed substrates.
Owner:APPLIED MATERIALS INC
Method to generate a plasma stream for performing electrosurgery
InactiveUS8057468B2Control areaEnhance flow-assisted removalSurgical instruments for heatingSurgical instruments for aspiration of substancesNoble gasSurgical site
Owner:BOVIE MEDICAL CORP
Electrosurgical device to generate a plasma stream
ActiveUS7316682B2Enhance flow-assisted removalSurgical instruments for heatingSurgical instruments for aspiration of substancesElectricityNoble gas
An electrosurgical device to generate a plasma stream for performing electrosurgery on a surgical site on a patient comprising an electrosurgical generator coupled to a electrical power source to supply power to the electrosurgical device and a plasma generator including an electrode operatively coupled to the electrosurgical generator to receive electrical energy therefrom and concentrically disposed within an inner noble gas conduit to form a plasma channel coupled to a noble gas source to feed noble gas to the inner noble gas conduct, an intermediate electronegative gas conduit disposed in surrounding coaxial relation relative to the noble gas conduit to cooperatively form an electronegative gas channel therebetween coupled to a gas source to feed electronegative gas to the electronegative gas channel and an outer aspiration conduit disposed in surrounding coaxial relation relative to the intermediate electronegative gas conduit to cooperatively form an aspiration channel therebetween coupled to a negative pressure source such that the electrode heats the noble gas to at least partially ionize the noble gas to generate the plasma stream to be directed to the surgical site to perform the surgical procedure while the electronegative gas maintains or sustains the plasma stream and the negative pressure source removes fluid and solid debris from the surgical site.
Owner:BOVIE MEDICAL CORPORATION
Plasma channel drilling process
Material is removed from a body of material, e.g. to create a bore hole, by plasma channel drilling. High voltage, high energy, rapid rise time electrical pulses are delivered many times per second to an electrode assembly in contact with the material body to generate therein elongate plasma channels which expand rapidly following electrical breakdown of the material causing the material to fracture and fragment.
Owner:STRATHCLYDE UNIV OF
Laser nanomachining device and method
ActiveUS20150158120A1Eliminate the effects ofSemiconductor/solid-state device manufacturingPrinted circuit manufactureSpectral bandsOptical axis
According to one aspect, the invention relates to a device (1, 2, 3) for laser nanomachining a sample made of a material having a given transparency band, the device comprising: a focusing module (203, 703) allowing a nondiffracting beam (210, 710) to be generated, along a focusing line generally oriented along the optical axis of the focusing module, from a given incident beam; first means (202, 702) for emitting a first light pulse (I1) of spectral band comprised in the transparency band of said material, able to generate in said material, after focusing by said focusing module, a plasma of free charges along said focusing line via multiphoton absorption, thus forming a “plasma channel”; and second means (202, 702) for emitting at least one second electromagnetic wave (I2) of spectral band comprised in the transparency band of said material, which wave(s) is / are intended to be spatially superposed on said plasma channel in order to heat said material via absorption by the free charges of the plasma.
Owner:CENT NAT DE LA RECHERCHE SCI +1
System for performing laser filamentation within transparent materials
InactiveUS20150034613A1Promote formationEasy to controlSemiconductor/solid-state device manufacturingGlass severing apparatusFilamentationLight beam
Systems and methods are described for forming continuous laser filaments in transparent materials. A burst of ultrafast laser pulses is focused such that a beam waist is formed external to the material being processed without forming an external plasma channel, while a sufficient energy density is formed within an extended region within the material to support the formation of a continuous filament, without causing optical breakdown within the material. Filaments formed according to this method may exhibit lengths exceeding up to 10 mm. In some embodiments, an aberrated optical focusing element is employed to produce an external beam waist while producing distributed focusing of the incident beam within the material. Various systems are described that facilitate the formation of filament arrays within transparent substrates for cleaving / singulation and / or marking. Optical monitoring of the filaments may be employed to provide feedback to facilitate active control of the process.
Owner:ROFIN SINAR TECH
Drive control system for a fiber-based plasma display
InactiveUS6946803B2Lower cost of capitalImprove discharge efficiencyGlass making apparatusStatic indicating devicesFiberDisplay device
A full color fiber plasma display device includes two glass plates sandwiched around a top fiber array and a bottom fiber array. The top and bottom fiber arrays are substantially orthogonal and define a structure of the display, with the top fiber array disposed on a side facing towards a viewer. The top fiber array includes identical top fibers, each top fiber including two sustain electrodes located near a surface of the top fiber on a side facing away from the viewer. A thin dielectric layer separates the sustain electrodes from the plasma channel formed by a bottom fiber array. The bottom fiber array includes three alternating bottom fibers, each bottom fiber including a pair of barrier ribs that define the plasma channel, an address electrode located near a surface of the plasma channel, and a phosphor layer coating on the surface of the plasma channel, wherein a luminescent color of the phosphor coating in each of the three alternating bottom fibers represents a subpixel color of the plasma display. Each subpixel is formed by a crossing of one top fiber and one corresponding bottom fiber. The plasma display is hermetically sealed with a glass frit. The sustain and address electrodes are brought out through the glass frit for direct connection to a drive control system.
Owner:MOORE CHAD BYRON
Mobile terawatt femtosecond laser system (MTFLS) for long range spectral sensing and identification of bioaerosols and chemical agents in the atmosphere
InactiveUS7391557B1Reduce probabilitySimultaneous measurementRadiation pyrometryLaser detailsFilamentationUltraviolet
The present invention relates to a system for detection and identification of airborne biological, chemical and / or nuclear threats such as toxins, spores, bacteria, and viruses in real time at distances from a few meters to several kilometers. Compact femtosecond terawatt laser technology is combined with spectroscopic and mathematical methods for spectral sensing of airborne warfare agents such as bio-aerosols. Trigger sensors and standoff devices based on mobile terawatt femtosecond laser systems are provided that may be placed at strategic monitoring locations. Furthermore, the invention relates to the propagation of airborne ultra-short, ultra-intense laser pulses giving rise to plasma channels (filamentation) producing white light supercontinuum ranging from the ultraviolet (UV), visible (VIS), near infra-red (NE) and middle infra-red (MIR). According to this invention, the supercontinuum can be directly produced in a particle cloud and hence is uniquely suitable for multi-spectral long-range atmospheric agent and radioactive isotope detection.
Owner:APPLIED PHOTONICS WORLDWIDE
Plasma-generating device, plasma surgical device, use of a plasma-generating device and method of generating a plasma
ActiveUS20070021748A1Increase energy densityImprove efficiencySurgical instruments for heatingPlasma techniqueEngineeringPlasma channel
The present invention relates to a plasma-generating device comprising an anode, a cathode and an elongate plasma channel which extends substantially in the direction from said cathode to said anode. The plasma channel has a throttling portion which is arranged in said plasma channel between said cathode and an outlet opening arranged in said anode. Said throttling portion divides said plasma channel into a high pressure chamber, which is positioned on a side of the throttling portion closest to the cathode, and has a first maximum cross-sectional surface transversely to the longitudinal direction of the plasma channel, and a low pressure chamber, which opens into said anode and has a second maximum cross-sectional surface transversely to the longitudinal direction of the plasma channel, said throttling portion having a third cross-sectional surface transversely to the longitudinal direction of the plasma channel which is smaller than said first maximum cross-sectional surface and said second maximum cross-sectional surface. Moreover at least one intermediate electrode is arranged between said cathode and said throttling portion. The invention also relates to a plasma surgical device, use of such a plasma surgical device in surgery and a method of generating a plasma.
Owner:PLASMA SURGICAL INVESTMENTS
Method and apparatus for performing laser curved filamentation within transparent materials
ActiveUS20160016257A1Improve bending strengthInhibition formationGlass drawing apparatusGlass transportation apparatusFilamentationPlasma channel
Systems and methods are described for forming continuous curved laser filaments in transparent materials. The filaments are preferably curved and C-shaped. Filaments may employ other curved profiles (shapes). A burst of ultrafast laser pulses is focused such that a beam waist is formed external to the material being processed without forming an external plasma channel, while a sufficient energy density is formed within an extended region within the material to support the formation of a continuous filament, without causing optical breakdown within the material. Filaments formed according to this method may exhibit lengths in the range of 100 μm-10 mm. An aberrated optical focusing element is employed to produce an external beam waist while producing distributed focusing of the incident beam within the material. Optical monitoring of the filaments may be employed to provide feedback to facilitate active control of the process.
Owner:ROFIN SINAR TECH
Electrosurgical device to generate a plasma stream
ActiveUS20080108985A1Enhance flow-assisted removalControl areaSurgical instruments for heatingSurgical instruments for aspiration of substancesNoble gasPlasma generator
An electrosurgical device to generate a plasma stream and method to perform endoscopic or laparoscopic surgery within a patient's body comprising an electrosurgical generator coupled to a electrical power source to supply power to the electrosurgical device and a plasma generator including an electrode operatively coupled to the electrosurgical generator to receive electrical energy therefrom and concentrically disposed within an inner noble gas conduit to form a plasma channel coupled to a noble gas source to feed noble gas to the inner noble gas conduit and an outer electronegative gas conduit disposed in surrounding coaxial relation relative to the inner noble gas conduit to cooperatively form an electronegative gas channel therebetween coupled to a gas source to feed electronegative gas to the electronegative gas channel or an outer aspiration conduit disposed in surrounding coaxial relation relative to the inner noble gas conduit to cooperatively form an aspiration channel therebetween coupled to a negative pressure source such that the electrode heats the noble gas to at least partially ionize the noble gas to generate the plasma stream to be directed to the surgical site to perform the surgical procedure while the electronegative gas sustains the plasma stream at the surgical site and dilutes the noble gas adjacent the surgical site or the negative pressure source removes fluid and solid debris from the surgical site respectively.
Owner:BOVIE MEDICAL CORPORATION
Laser micromachining method
InactiveUS20060099810A1Semiconductor/solid-state device manufacturingWelding/soldering/cutting articlesLight beamPlasma channel
A laser micromachining method is disclosed wherein a workpiece is milled using an incident beam from a laser beam focused above the surface of the workpiece. The incident beam is guided by a plasma channel generated by the incident beam. The plasma channel, which has a relatively constant diameter over an extended distance, is generated by continual Kerr effect self-focusing balanced by ionization of air beam defocusing.
Owner:INTEL CORP
Plasma generating apparatus
InactiveUS20100065215A1Generate efficientlyImprove permeabilityElectric discharge tubesSemiconductor/solid-state device manufacturingHigh densityPlasma channel
A plasma generating apparatus including a plurality of plasma source modules. Each plasma source module includes a ferrite core having high magnetic permeability and a plasma channel through which plasma may pass. The plasma generating apparatus may effectively generate and uniformly distribute large-area and high-density plasma without a dielectric window.
Owner:SAMSUNG ELECTRONICS CO LTD
Laser micromachining method
InactiveUS7303977B2Semiconductor/solid-state device manufacturingWelding/soldering/cutting articlesLight beamPlasma channel
A laser micromachining method is disclosed wherein a workpiece is milled using an incident beam from a laser beam focused above the surface of the workpiece. The incident beam is guided by a plasma channel generated by the incident beam. The plasma channel, which has a relatively constant diameter over an extended distance, is generated by continual Kerr effect self-focusing balanced by ionization of air beam defocusing.
Owner:INTEL CORP
Plasma-spraying device
InactiveUS20060091116A1Satisfactory controlImprove homogeneityMolten spray coatingArc welding apparatusEngineeringPlasma channel
The invention relates to a plasma-spraying device for spraying a powdered material, comprising electrodes (1), which form a plasma channel (2) having an inlet end (3) and an outlet end (4), and a means (5) for supplying said powdered material to said plasma channel (2). The powder supply means (5) is arranged between a first section (6) of said electrodes (1) located upstream of the means (5) and a second section (7) of said electrodes (1) located downstream of the means (5), as seen in the direction of plasma flow of the plasma channel (2).
Owner:PLASMA SURGICAL INVESTMENTS
Plasma spraying device and method
ActiveUS20080185366A1High level of homogeneityAvoid insufficient heatingMolten spray coatingEfficient propulsion technologiesHigh pressurePlasma channel
A device and a method for plasma spraying are disclosed. The device comprises, a cathode, an anode, a plasma channel formed by the anode and intermediate electrodes, and one or more flowable material injectors. The plasma channel has a throttling portion that divides the plasma channel into a high pressure portion near the cathode formed by at least one intermediate electrode and a low pressure portion near the anode. During operation, a plasma generating gas is heated by the arc maintained between the cathode and the anode, forming plasma. When the plasma passes through the throttling portion, its speed increases to a supersonic speed, and at the same time its static pressure drops. Flowable materials are injected in the plasma flow in the low pressure portion. The particles in the flowable materials are heated by the plasma and the resultant heated particles and plasma are output from the outlet of the plasma channel.
Owner:PLASMA SURGICAL INVESTMENTS
Method and apparatus for performing laser filamentation within transparent materials
ActiveUS9102007B2Promote formationFor active controlSemiconductor/solid-state device manufacturingGlass severing apparatusPlasma channelOptical breakdown
Systems and methods are described for forming continuous laser filaments in transparent materials. A burst of ultrafast laser pulses is focused such that a beam waist is formed external to the material being processed without forming an external plasma channel, while a sufficient energy density is formed within an extended region within the material to support the formation of a continuous filament, without causing optical breakdown within the material. Filaments formed according to this method may exhibit lengths exceeding 10 mm. In some embodiments, an aberrated optical focusing element is employed to produce an external beam waist while producing distributed focusing of the incident beam within the material. Various systems are described that facilitate the formation of filament arrays within transparent substrates for cleaving / singulation and / or marking. Optical monitoring of the filaments may be employed to provide feedback to facilitate active control of the process.
Owner:KINESTRAL TECH
Plasma spraying device and method
ActiveUS7928338B2High level of homogeneityAvoid insufficient heatingMolten spray coatingEfficient propulsion technologiesHigh pressurePlasma channel
A device and a method for plasma spraying are disclosed. The device comprises, a cathode, an anode, a plasma channel formed by the anode and intermediate electrodes, and one or more flowable material injectors. The plasma channel has a throttling portion that divides the plasma channel into a high pressure portion near the cathode formed by at least one intermediate electrode and a low pressure portion near the anode. During operation, a plasma generating gas is heated by the arc maintained between the cathode and the anode, forming plasma. When the plasma passes through the throttling portion, its speed increases to a supersonic speed, and at the same time its static pressure drops. Flowable materials are injected in the plasma flow in the low pressure portion. The particles in the flowable materials are heated by the plasma and the resultant heated particles and plasma are output from the outlet of the plasma channel.
Owner:PLASMA SURGICAL INC
Pulsed plasma device and method for generating pulsed plasma
A device and a method for generating a truly pulsed plasma flow are disclosed. The device includes a cathode assembly comprising a cathode and a cathode holder, an anode, and two or more intermediate electrodes, the anode and the intermediate electrodes forming a plasma channel expanding toward the anode. The intermediate electrode closest to the cathode may form a plasma chamber around the cathode tip. An extension nozzle forming an extension channel having a tubular insulator along at least a portion of its interior surface is affixed to the anode end of the device. During operation, a voltage is applied between the cathode and the anode and a current is passed through the cathode, the plasma, and the anode. The voltage and current profiles are selected to cause the rapid development of a plasma flow with required characteristics. A substantially uniform temperature and power density distribution of the plasma pulse is achieved in the extension nozzle. Additionally, ozone may be generated in the extension nozzle during the generation of the plasma pulse.
Owner:PLASMA SURGICAL INVESTMENTS
Electric pulse rock-breaking dill bit and experimental facility thereof
ActiveCN108222838AImprove energy efficiencyImprove drilling qualityMachine part testingDrill bitsLow voltageElectrical impulse
The invention discloses an electric pulse rock-breaking dill bit and an experimental facility thereof. The electric pulse rock-breaking experimental facility comprises a confining pressure pumping station, a pulsed power supply, a PLC control device, a confining pressure cylinder horizontal-moving device, a water inlet and outlet pump, a confining pressure cylinder assembly, a high-pressure electric pulse rock-breaking drill bit body, and the like. The high-voltage pulsed power supply is used for transmitting high-voltage pulse electricity from a high voltage electrode to a low voltage electrode through a cable, the high-voltage pulse electricity meeting certain conditions breaks through rocks firstly to generate a discharge channel, a plasma channel expands when heated, when the pressureexceeds the stress intensity of the rocks, and the rocks are broken and the high-voltage pulse discharge drilling is realized. The high-pressure electric pulse rock-breaking experimental facility cansimulate the high voltage environment of deep drilling in the earth, electric pulse drilling experiments carried out on high temperature and high pressure deep wells and ultra-deep wells are more close to actual drilling environments, experimental studies on the geometrical shape, distribution, spacing and electrode materials of electrodes of high-voltage electric pulse rock-breaking drill bit inthe deep wells and the ultra-deep wells can be realized, and the high-voltage pulse discharge drilling has broad development prospects.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN) +1
Method for generating plasma photon crystal having three refractivities
InactiveCN101013163AEasy to useEasy to manufactureLaser detailsOptical elementsElectronic densityRefractive index
The invention relates to a method to generate three refraction rates plasma photonic crystal, which uses the following discharge device to reach the goal: the basic structure of discharge device includes two symmetric closed dielectric containers, and between the two containers setting the discharge gap, in the containers, setting discharge electrode fuses, and importing the water into the containers to form the discharge electrodes; by changing the discharge conditions, including changing the applied voltage frequency and amplitude, and the discharge gap shape border and aspect ratio, discharging will produce three refraction rates plasma photonic crystal structure with different cycles, and different lattice constants. Since the electronic density in the plasma channel has the three orders of 1015cm, theoretical studies indicating that such high electronic density is enough to enable the plasma photonic crystal having band gap structure, to prevent the spread of certain frequency lights, and having frequency-selective optical switching function, which has a broad application prospects in the industrial field.
Owner:HEBEI UNIVERSITY
Mobile terawatt femtosecond laser system (MTFLS) for long range spectral sensing and identification of bioaerosols and chemical agents in the atmosphere
InactiveUS20080180655A1Reduce probabilitySimultaneous measurementLaser detailsRadiation pyrometryFilamentationUltraviolet
The present invention relates to a system for detection and identification of airborne biological, chemical and / or nuclear threats such as toxins, spores, bacteria, and viruses in real time at distances from a few meters to several kilometers. Compact femtosecond terawatt laser technology is combined with spectroscopic and mathematical methods for spectral sensing of airborne warfare agents such as bio-aerosols. Trigger sensors and standoff devices based on mobile terawatt femtosecond laser systems are provided that may be placed at strategic monitoring locations. Furthermore, the invention relates to the propagation of airborne ultra-short, ultra-intense laser pulses giving rise to plasma channels (filamentation) producing white light supercontinuum ranging from the ultraviolet (UV), visible (VIS), near infra-red (NIR) and middle infra-red (MIR). According to this invention, the supercontinuum can be directly produced in a particle cloud and hence is uniquely suitable for multi-spectral long-range atmospheric agent and radioactive isotope detection.
Owner:APPLIED PHOTONICS WORLDWIDE
Apparatus and method for separating plasma
ActiveUS20120177537A1High plasma separation efficiencyReduce testingSemi-permeable membranesSamplingHemolysisCentrifugation
An apparatus for separating plasma by which plasma can be separated from a small amount of whole blood cell sample without centrifugation is disclosed. This apparatus includes a blood channel through which blood flows; and a plasma channel through which plasma separated from said blood flows. The plasma channel is arranged at least partially in parallel with said blood channel and the blood channel and the plasma channel are at least partially in contact with each other along the longitudinal direction of the channels. Blood is made to flow at a flow rate at which blood cell components in the blood flowing through the blood channel axially accumulate and at which hemolysis does not occur. The plasma moves to the plasma channel after being separated into a blood cell layer and a plasma layer.
Owner:INST OF MICROCHEM TECH +1
Plasma-generating device, plasma surgical device and use of plasma surgical device
ActiveUS20070021747A1Long operating timeSmall form factorSurgical instruments for heatingPlasma techniquePlasma channelSurgical device
The present invention relates to a plasma-generating device, comprising an anode, a cathode and a plasma channel which in its longitudinal direction extends at least partly between said cathode and said anode. The end of the cathode which is directed to the anode has a cathode tip tapering towards the anode, a part of said cathode tip extending over a partial length of a plasma chamber connected to the plasma channel. The plasma chamber has a cross-sectional surface, transversely to the longitudinal direction of the plasma channel, which exceeds the cross-sectional surface, transversely to the longitudinal direction of the plasma channel, of an opening, positioned closest to the cathode, of the plasma channel. The invention also concerns a plasma surgical device and use of such a plasma surgical device.
Owner:PLASMA SURGICAL INVESTMENTS
Plasma generating apparatus
ActiveUS20090015165A1Reduce lossesImprove power generation efficiencyElectric discharge tubesElectric arc lampsElectromagnetic fieldPlasma channel
A plasma generating apparatus having superior plasma generation efficiency that uses a single reaction chamber. The plasma generating apparatus includes a RF generator for providing a RF power, an antenna for generating an electromagnetic field upon receiving the RF power, a reaction chamber for exciting / ionizing a reaction gas via the electromagnetic field, and generating a plasma, and a plasma channel for absorbing the RF power, and allowing a current signal to be induced to the plasma.
Owner:SAMSUNG ELECTRONICS CO LTD
Plasma drilling bit
ActiveCN104563882AAvoid severe wear and tearImprove efficiencyDrill bitsRate of penetrationWell drilling
The invention relates to a plasma drilling bit in the field of drilling bit tools. The technical scheme adopted by the invention is that a fluid passageway and an electrode through hole which respectively and axially communicated are preformed in a bit body; a high-voltage positive electrode and insulators are fixedly connected with the interior of the electrode through hole; the bottom part of the bit body is fixedly connected with an annular ground electrode; the bottom part of the high-voltage positive electrode is provided with a high-voltage panel mounting electrode; an annular interelectrode gap is reserved between the high-voltage panel mounting electrode and the annular ground electrode. The bit penetrates a plasma channel formed in front of to-be-drilled rock under the high-voltage pulse liquid phase microdischarge action to crush the rock, and does not need to be contacted with the surface of the rock, and mechanical lapping is not needed. The plasma drilling bit disclosed by the invention has the advantages that the abrasion of the bit can be reduced, the rate of penetration is increased, and the required energy is low; compared with the conventional mechanical rotary bit, the plasma drilling bit is low in cost and high in efficiency, and can also be applied to industry of mining and the like.
Owner:CHINA PETROCHEMICAL CORP +1
Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum
The invention discloses an adjustment and control device and method for an ultra intense and ultra short laser pulse super-continuum spectrum. After passing through a variable attenuation sheet and a time delay line, a beam of laser G (t) irradiates to a concave mirror in parallel with another beam of laser G (f) passing through a movable reflector; and G (t) and G (f) are reflected through the concave mirror and then crossed and focused. In a plasma channel produced by laser filamentation, a space plasma grating is formed because of double light beam interference; the super-continuum spectrum produced during the filamentation can be enhanced by using the plasma grating; and control and transfer of the energy of the super-continuum spectrum between the two beams of laser can be realized. According to the method and the device provided by the invention, the spectrum of the ultra short pulse can be actively controlled in an ultra intense laser field; and an involved light path has a simple structure and is convenient for adjustment.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Plasma generating apparatus
ActiveUS8169148B2Improve power generation efficiencyEvenly distributedElectric discharge tubesElectric arc lampsElectromagnetic fieldPlasma channel
Owner:SAMSUNG ELECTRONICS CO LTD
Method for heating oil shale underground in situ
ActiveCN103174406ALower resistanceNo fracking requiredElectric discharge heatingFluid removalElectricityHeating oil
The invention discloses a method for heating oil shale underground in situ. According to the method, shale oil and fuel gas can be obtained from an underground oil shale seam in situ, and the fuel gas can also be obtained from an underground coal seam in situ. Wells are drilled downwardly from the ground surface, and the drilling depth of each well reaches the inside of an operation region of an underground oil shale ore bed. At least two wells are drilled, and electrodes are placed in the wells. Firstly, high-voltage electricity which is sufficient to cause partial discharge of the oil shale ore bed is conducted into the electrodes, and then a plasma channel is formed in the oil shale ore bed and can be subjected to breakdown by the high-voltage electricity; after the resistance of each of two electrode regions is lowered, the two electrodes are used for conducting currents into the plasma channel in the oil shale ore bed; the oil shale ore bed is heated under the resistance heating function of the plasma channel; and released heat is used for realizing thermal cracking and gasification of fixed organic carbon in the oil shale ore bed. Through the method for heating the oil shale underground in situ, the heating speed of an underground ore bed can be increased, hydraulic fracturing does not need to be carried out on a rock stratum, and the use of poisonous conductive materials is avoided at the same time.
Owner:JILIN UNIV
Pulse type large beam spot electronic beam generating device
InactiveCN101582367ASuppression of self-pinch effectAvoid scatter interferenceElectric discharge tubesHigh pressurePlasma channel
The invention discloses a pulse type large beam spot electron beam generating device, belonging to the technical field of modification of material surfaces. The device consists of a high-voltage pulse power supply, a time sequence control circuit, an electronic gun and a vacuum chamber. The vacuum chamber is controlled by discharging time sequence of the high-voltage pulse power supply after reaching working pressure; a magnetic field formed in the electronic gun confines the discharge of a plasma anode; a plasma channel is formed between the cathode and the anode of the electronic gun; and the cathode is applied with high-voltage negative pulse so as to form electronic emission on the cathode surface and obtain the pulse electron beam with large beam spots. The device can generate electron beam with accelerating voltage of 20 to 35kV, the pulse duration of 2 to 4Mus, the beam spot area with the diameter of 60mm and repetition frequency of 0.1Hz, and the average energy density of the beam spot is 1 to 6J / cm. The pulse type large beam spot electron beam generating device also has the advantages of reasonable design, simple structure, high degree of automation and the like and is applicable to research and application of modification technique of the material surface.
Owner:DALIAN UNIV OF TECH
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