83 results about "Beam electron" patented technology

A system for storing data on a magnetic medium using spin polarized electron beams is provided. The system includes a source of spin polarized electrons and a storage medium disposed a selected distance from the source. The storage medium has a plurality of storage locations, each of which includes a layer of magnetic material sandwiched between first and second layers of a half-metallic material. The resulting sandwich structure forms a spin dependent electron trap that increases coupling between beam electrons in a first spin state and target electrons in a second spin state. An electron optics system directs the source of spin polarized electrons to one of the plurality of storage locations.

A klystron has a hollow beam electron gun that has a circular planar electron emitting surface. A hollow electron beam is directed from the electron gun through a plurality of drift tubes, resonant chambers and magnetic fields to a collector. The hollow electron beam does not experience significant radial movement and can operate at a lower beam voltage which reduces the required length of the RF interaction circuit and lowers the risks of RF arcing.

The invention belongs to an oval sheet beam electron gun, which is used with a travelling wave tube, a backward wave tube and the like. The oval sheet beam electron gun comprises a shell, an electric heating wire in the shell, a cathode component, a focusing electrode component and an anode, wherein an emitting surface of a cathode head of the cathode component is a plane, the focusing electrode component comprises a pyramidal focusing hole, and the anode is positioned at an output port of the shell and provided with an anode hole which is a cylindroid hole. The cathode head is made of lanthanum hexaboride, the emitting surface of the cathode head is modified into a plane, a pyramidal hole with a rectangular axial section is used as the focusing hole, and the cylindroid hole is used as the anode hole, so that the oval sheet beam electron gun has the advantages that the oval sheet beam electron gun is simple in structure and convenient in processing, the precision is easy to be guaranteed, devices are easy to be miniaturized, the production cost is low, current emitted by the cathode head is high in density, operation frequency of the devices and current density of electron beams can be improved effectively, the electron gun is high in output efficiency and long in service life, and the like. The defects of complex structure, low current density and unevenness of the electron beams, high evaporativity and short service life of the cathode in operation at high temperature, and the like in the prior art can be overcome.

The invention relates to a high-intensity focused ultrasound spherical phased array with array elements annually and intensively distributed, comprising a rigid spherical crown body and a plurality of array elements, wherein one array element is independently arranged in the center of the spherical crown body, and the other array elements are evenly and dispersedly distributed on a plurality of layers of concentric rings which take the center of the spherical crown body as an original point; the angular spacings among all ring layers are not equal, and the spacings among all ring layers and the spacing between adjacent array elements in the same ring are set according to an array element intensive distribution principle; the position of the original array element of each layer of concentric rings is randomly set, the other array elements are subsequently, intensively and evenly distributed on the concentric rings according to equiangular spacing, and each array element has independent electric excitation signal feeder lines which are respectively connected to a phased signal excitation system. The invention calculates the phase position and the voltage amplitude distribution of the array elements by adopting a focus model synthesis method based on a pseudo-inverse matrix theory, realizes acoustic beam electron focusing and scanning, generates required single-focus or multi-focus sound field control modes, and the like and is applied to heating and fusing target tumor focuses in the human body.

The invention relates to the technical field of material testing, and specifically relates to a sample sealing and vacuum transferring device for cross-platform connection of an electron microscope ora micro-nano laser processing system. The device comprises a rectangular airtight flange, a vacuum sealing transferring box, a high-precision support, a clamp structure, a mechanical arm unlocking mechanism, a vacuum transition bin, an observation window and a bin door, wherein the rectangular airtight flange is used for being connected with the side wall of an electron microscope vacuum sample chamber or a laser processing system vacuum cavity; the vacuum sealing transferring box is used for packaging a test sample; the high-precision support and the clamp structure are used for achieving connection of the sample and the electron microscope or the micro-nano laser processing system; the mechanical arm unlocking mechanism is used for controlling the vacuum sealing transferring box; the vacuum transition bin is used for placing and replacing the vacuum sealing transferring box; the observation window is used for determining the opening state of the vacuum sealing transferring box; andthe bin door is used for observing opening. The sample sealing and vacuum transferring device can be widely applied to cross-platform connection and vacuum transferring of scanning electron microscopes, electron beam and ion beam double-beam electron microscopes or micro-nano laser processing systems of various types, and a systematic sample assembling, protecting, transferring and feeding deviceis formed.

The invention belongs to a coaxial dual-electron beam electron gun assorted with a gyrotron (an oscillator and an amplifier), which comprises an electron gun barrel body, a base, a cathode sleeve with an electric heating wire and two electron beam emitting rings, internal and external anodes and a control anode. In the coaxial dual-electron beam electron gun, the internal and external anodes and the cathode sleeve are arranged oppositely and coaxially, the internal anode and the external anode are still arranged in an overlapping (telescopic) way, and the control anode is also arranged between the internal and external anodes and a cathode head to regulate the current of an electron beam and the rotation speed and axial speed of the electron beam in the gyrotron. Therefore, the invention has the characteristics that: output power can be regulated quickly, work efficiency of the gyrotron also can be regulated arbitrarily within the range of the peak efficiency of the gyrotron, the performance of the coaxial dual-electron beam electron gun and the application range of the gyrotron assorted with the electron gun are improved effectively, breakdown between the internal and external anodes and the cathode sleeve and between the control anode and the cathode sleeve is prevented, the coaxial dual-electron beam electron gun is favorable for the miniaturization of devices, and the like.

The invention belongs to the field of planetary science and planetary detection, and provides a method for preparing a micron-sized single-particle multi-TEM slice sample in situ. The method comprisesthe following steps: adhering and fixing a single-particle sample on a needle point in a partially suspended mode, placing the single-particle sample on a sample table of a double-beam electron microscope, installing an FIB carrying net, sealing a sample cavity and vacuumizing; depositing a Pt layer on the surface of the single-particle sample; observing the single-particle sample from an ion beam interface of the double-beam electron microscope, selecting an interested region, performing denudation cutting processing on the single-particle sample by using FIB, cutting the interested region from the single-particle sample to obtain a slice, and bonding the slice with a nano manipulator configured by the double-beam electron microscope; adhering the slice on the nanometer manipulator to anFIB carrying net to enable the slice to be vertical to the sample table, cutting off the connection between the slice and the nanometer manipulator, and thinning the slice by using the FIB to preparea TEM slice sample; and repeating the cutting and thinning operations to prepare single particle samples into a plurality of TEM sheet samples.

A scanning electron microscopy system is disclosed. The system includes a multi-beam scanning electron microscopy (SEM) sub-system. The SEM sub-system includes a multi-beam electron beam source configured to generate a plurality of electron beams, a sample stage configured to secure a sample, an electron-optical assembly, and a detector assembly configured to detect a plurality of electron signalbeams emanating from the surface of the sample to form a plurality of images, each image associated with an electron beam of the plurality of electron beams. The system includes a controller configured to receive the images from the detector assembly, compare two or more of the images to identify common noise components present in the two or more images, and remove the identified common noise components from one or more images of the plurality of images.

The invention relates to a scanning tunneling microscope probe with the use of a two-dimensional atomic crystal material. The two-dimensional atomic crystal material is vertically fixed to the end face of a conductive rod according to an ohmic contact mode, an atomic level tip is realized by using the atomic layer thickness of the two-dimensional atomic crystal material, line scanning is obtained by using the linear beam electron emission of a two-dimensional structure, and the high conductivity of the two-dimensional atomic crystal material is used to realize weak signal acquisition. The technical realization method of the invention is simple, and high resolution imaging and rapid scanning imaging functions can be realized.

The invention discloses a radial radiating beam electronic gun suitable for radial logarithmic spiral microstrip slow-wave lines, and is an electronic gun in the technical field of vacuum electronic devices. The radial radiating beam electronic gun suitable for radial logarithmic spiral microstrip slow-wave lines ensures better synchronization with radial logarithmic spiral microstrip slow-wave lines employing planar sector electron beams for working. The radial radiating beam electronic gun comprises a gun casing, and a cathode assembly, a control electrode and an anode arranged in the gun casing, wherein the cathode head of the cathode assembly is placed in a radial hole in the control electrode. The invention is especially for a radial radiating beam electron gun cooperatively used with radial logarithmic spiral microstrip slow-wave lines.

The invention discloses a design method of a strip beam traveling wave tube slow wave structure working in a high-order mode, and relates to the technical field of microwave electronics and terahertz.The design method has the advantages that the strip beam traveling wave tube is enabled to successfully work in a high-order mode, limitation of cut-off frequency on the width of an electron channelis eliminated, the advantage of large width of strip beam electrons is brought into full play, and the power capacity of the strip beam traveling wave tube is greatly increased. Meanwhile, due to thefact that the size is enlarged, the machining and assembling difficulty is further reduced, a device can work under the large voltage, the interaction impedance is improved, and the electron beam andelectromagnetic wave transduction efficiency is improved. Compared with a traveling wave tube with a circular section electron beam in a traditional working mode, the power capacity is improved by oneorder of magnitude.

The invention belongs to a coaxial dual-electron beam electron gun matched with a gyrotron (an oscillator and an amplifier), which comprises an electron gun barrel body, a base, a cathode sleeve withan electric heating wire and two electron beam emitting rings, internal and external anodes and a control anode. In the coaxial dual-electron beam electron gun, the internal and external anodes and the cathode sleeve are arranged oppositely and coaxially, the internal anode and the external anode are still arranged in an overlapping (telescoping) manner, and the control anode is arranged between the internal and external anodes and a cathode head so as to regulate the current of an electron beam and the rotation speed and axial speed of the electron beam in the gyrotron. Therefore, the coaxialdual-electron beam electron gun has the characteristics that the output power can be regulated quickly, the work efficiency of the gyrotron can be regulated arbitrarily within the range of the peak efficiency of the gyrotron, the performance of the coaxial dual-electron beam electron gun and the application range of the gyrotron matched with the electron gun are effectively improved, breakdown between the internal and external anodes and the cathode sleeve and between the control anode and the cathode sleeve is prevented, the miniaturization of devices is facilitated, and the like.

The invention discloses a structure of a high-power strip beam electron gun with a rectangular section and relates to a vacuum electronic device technology. A cathode is a rectangular cylinder structure; a focusing electrode is a square frame-shaped structure spliced by two focusing planes with a certain inclination angles in the transverse direction; an anode is a structure with a hollow passage with a certain taper; an anode head is fixedly arranged at the center of a bottom surface inside an anode supporting barrel; the periphery of the rectangular cylinder cathode is matched with the hollow square frame at the bottom of the focusing electrode; the cathode and the focusing electrode are positioned in the anode supporting barrel; two symmetrical planes of the focusing electrode are parallel to two symmetrical planes of the anode and the central axes of the focusing electrode nd the anode are coincident; and a certain distance is formed between the focusing electrode and the anode. The electron gun disclosed by the invention has a direct current power of about 15MW, specification of 50mm*4mm of an electron beam section and compression ratio of 5:1 in the narrow edge direction and has excellent fluidity of an beam inner layer at the position of a beam waist. The generation problem of a strip electron beam is solved. The high-power strip beam electron gun with the rectangular section can be used in a high-power strip beam device and can be matched with a focusing system to realize long-distance stable transmission.

The invention discloses a preparation method of an in-situ electrical TEM sample. The method comprises the following steps: connecting an electrode material and a solid electrolyte by using a magnetron sputtering method, then placing the electrode/electrolyte material in a focused ion beam-electron beam double-beam electron microscope, depositing a protective layer on the surface, etching, cuttingoff and extracting a TEM sheet. A circulating electrode of the in-situ heating chip, the in-situ heating chip is refitted into a double-electrode power-up chip, the double-electrode power-up chip isconnected with the TEM sheet, the double-electrode power-up chip is bidirectionally shearing until the thickness is about 200nm, and an amorphous layer is removed until the thickness of the amorphouslayer is below 100nm to obtain thein-situ electrical TEM sample. According to the invention, scanning electron microscopy is combined with in-situ transmission electron microscopy,and dynamic observation of charge distribution of an electrode/electrolyte interface or an electrode internal interface on working conditions and a microcosmic scale is achieved. The preparation process is simple, and the universality is high.

Axially symmetric magnetic fields are provided about the longitudinal axis of each beam of a multi-beam electron beam device. The magnetic field symmetry is independent of beam voltage, beam current and applied magnetic field strength. A flux equalizer assembly is disposed between the cathodes and the anodes and near the cathodes of a multi-beam electron beam device. The assembly includes a ferromagnetic flux plate completely contained within the magnetic focusing circuit of the device. The flux plate includes apertures for each beam of the multi-beam device. A flux equalization gap or gaps are disposed in the flux plate to provide a perturbation in the magnetic field in the flux plate which counters the asymmetry induced by the off-axis position of the beam. The gaps may be implemented in a number of ways all of which have the effect of producing a locally continuously varying reluctance that locally counters the magnetic field asymmetry. The flux equalizer assembly prevents or substantially reduces beam twist and maintains all of the electron beams of the device as linear beams.

The invention belongs to a coaxial double electron beam electron gun matched with a gyrotron (an oscillator and an amplifier), an electron gun barrel body, a base, a cathode sleeve with a heating wireand two electron beam emission rings, inner and outer anodes and a control anode. The inner anode, the outer anode and the cathode sleeve are oppositely arranged by employing a coaxial line, the inner anode and the outer anode are arranged in a stack mode, and the control anode is arranged among the inner and outer anodes and the cathode sleeve to regulate the size of an electron beam current andthe rotation speed and the axial speed of the electron beam in the gyrotron. The coaxial double electron beam electron gun can rapidly regulate the output power and can perform any regulation for theworking efficiency of the gyrotron in the highest efficiency range to effectively improve the performances of the coaxial double electron beam electron gun and the application range of the gyrotron matched with the coaxial double electron beam electron gun; and moreover, breakdown cannot be generated between the inner and outer anodes and the cathode sleeve and between the control anode and the cathode sleeve to facilitate the miniaturization of the device.

The invention discloses a multi-electron-beam additive manufacturing method for a high-entropy alloy foamed structure. The method comprises the following steps that firstly, high-entropy alloy powder is prepared according to a preset proportion; secondly, a three-dimensional model of the additive component of the foam structure is established; thirdly, titanium alloy is selected as a base plate, and preheating treatment is conducted; 4, high-entropy alloy powder is laid, and scanning is completed in the area A according to an electron beam scanning path; 5, dividing the electron beam into a plurality of electron streams to scan the high-entropy alloy powder; step 6, scanning step by step according to the steps 2, 3, 4 and 5 until a preset layer number is reached; and seventhly, heat treatment is conducted in the argon shielding gas atmosphere, and the high-entropy alloy component of the foamed structure is obtained. The prepared high-entropy alloy component of the foam structure meets the requirements for strength and toughness.