30results about "Multiplier electrode arrangements" patented technology

A particle detector switchable from an ion detector to an electron detector includes an ion-to-electron converter and a scintillator detector. With one set of voltages on the components, the converter has minimal impact on the electron trajectories so the electrons are efficiently detected by the scintillator detector. With different voltage settings on the components, the detector can be operated in positive ion mode to collect positive ions with adequate efficiency for most FIB applications. The ion-to-electron converter is preferably in the shape of a cylinder or includes multiple parallel plates

The present invention relates to silicate skin glass, micro-pore optics and a preparation method thereof. The silicate skin glass is composed of the following components in molar percentages: 60-80% of SiO<2>, 5-20% of Bi<2>O<3>, 0.1-3.5% of Al<2>O<3>, 0.1-10% of a total content of Na<2>O, K<2>O and Cs<2>O, and 3-15% of a total content of MgO, BaO and CaO. The micro-pore optics are prepared from the silicate skin glass. The silicate skin glass is used to prepare the micro-pore optics and improves the tensile strength of the micro-pore optics, so that the micro-pore optics have the tensile strength greater than 65 MPa. A thermal expansion coefficient of the silicate skin glass is small, which solves the problems that the microporous micro-pore optics are deformed and broken, and the thermal expansion coefficient of the micro-pore optics at 20 DEG C to 300 DEG C is 60x10^7-90x10^7/DEG C.

A radiation converter has a radiation absorber for generating photons dependent on the intensity of incident x-ray radiation, a photocathode arranged downstream of the radiation absorber in the radiation propagation direction at a distance therefrom and serving for generating electrons dependent on the photons emerging from the radiation absorber, a device for accelerating the electrons emerging from the photocathode onto an electron detector for generating electrical signals dependent on the impinging electrons, an electron multiplier arranged between the photocathode and the electron detector, the electrons emerging from the photocathode being multiplied by the electron multiplier.

The invention belongs to the technical field of photoelectric detection devices, and particularly relates to a gating focus type photomultiplier tube. The structure of the gating focus type photomultiplier tube comprises a vacuum container, one end of the vacuum container is provided with an input window, the inner surface of the input window is provided with a negative pole, and the other end ofthe vacuum container is provided with a positive pole; a gate electrode, a focusing electrode and an electron multiplier are arranged between the negative electrode and the positive electrode in turn.The gating focus type photomultiplier tube solves the technical problem that the effective detection area of an existing photoelectric detection device is limited. The gating focus type photomultiplier tube is a photomultiplier tube not only provided with a gating function and but also provided with an electronic focusing function. The gating focus type photomultiplier tube has the advantages that the magnifying power focusing function enables the electrons emitted by a large-area photocathode to be sent onto the electron collecting surface of a small-sized electron multiplier, thereby increasing the detection area of the photomultiplier tube.

In order to solve the technical problem of low detection accuracy of lidar, A focusing-scanning type photomultiplier tube By providing a focusing system in a vacuum vessel of the photomultiplier tube,The scanning system and the electron multiplier cluster located at the focal point of the focusing system enable different electron multiplier regions to receive the signal electrons to be multipliedand output according to the time sequence, so that the same electron multiplier region has enough electron multiplication, electronic output and performance recovery time; Because the number of the electron multiplier cluster is tens or hundreds, the sampling frequency of the photomultiplier tube can be increased by tens or hundreds of times, and can be raised to the order of tens of GHz when theelectron multiplier cluster is effectively utilized.

The invention relates to low-delay-pulse, low-crosstalk and high-collection-efficiency micro-channel plate. The micro-channel plate comprises a two-dimensional array composed of a plurality of parallel channels. An input electrode layer is plated on the upper end surface of the two-dimensional array. An output electrode layer is plated on the lower end surface of the two-dimensional array. The improvement of the invention is embodied as an input port arranged in the input electrode layer and an output port arranged in the output electrode layer. The input port is communicated with the upper ends of the channels, and the output port is communicated with the lower ends of the channels. The input port is gradually reduced from top to bottom, so that the opening area of the channels of the micro-channel plate is larger than 90%. The surface of the input electrode is covered with a thin film with a high secondary electron emission coefficient. According to the micro-channel plate, the opening area of micro-channels is large, so that the probability of electrons entering the channels is increased. The collecting efficiency is improved. The thin film made of the high-secondary electron emission material and covered on the surface of the electrode can reduce the probability of electron loss falling on the surface of the electrode. As a result, the collecting efficiency is further improved.

The invention discloses a curved surface film forming method for a dynode of an electron multiplier and effectively solves the problems of stability and uniformity in coating of films onto specific curved surfaces of dynodes of electron multipliers. The method includes: processing a curved surface liner with to-be-bent areas at two ends according to the size and radian of a to-be-coated inner surface of a dynode shell of the electron multiplier, wherein one of the to-be-bent areas is reversely folded by 180 degrees towards the outside of the curved surface to form a folded portion, and the other to-be-bent area is cut to form n rectangular toothed fasteners; coating a film onto the curved surface liner; mounting the coated curved surface liner on the inner surface of the dynode shell of the electron multiplier, and fixing with the folded portion and the rectangular toothed fasteners.

The invention relates to an inverted image enhanced ultrafast imaging detector, and solves the problem that a semiconductor chip in an existing double-near-surface-mount structure is prone to vacuum breakdown. The detector comprises a shell, an input window, an output window, a photoelectric cathode, a first electrostatic focusing electrode, a micro-channel plate, a second electrostatic focusing electrode and a semiconductor detection chip, an input window and an output window are arranged at the two ends of the shell respectively. The inner surface of the input window is plated with a layer of conductive film, and the photoelectric cathode is manufactured on the conductive film; the semiconductor detection chip clings to the inner surface of the output window; a first electrostatic focusing electrode, a micro-channel plate and a second electrostatic focusing electrode are sequentially arranged between the photoelectric cathode and the semiconductor detection chip; the first electrostatic focusing electrode and the second electrostatic focusing electrode are the same; and the input surface and the output surface of the micro-channel plate are loaded with the working voltage.

The present invention provides a double focusing electrode for a photomultiplier tube and a photomultiplier tube. The double focusing electrode comprises a bowl-shaped auto-expanding focusing electrode and a secondary focusing electrode. The bowl-shaped auto-expanding focusing electrode comprises an annular bottom plate and a rotating shaft, a curved blade, a torsion spring and a triggering devicearranged on the bottom plate. The secondary focusing electrode is an annular metal electrode fixed on the annular bottom plate. An insulating component is arranged between the secondary focusing electrode and the bottom plate for forming insulation between the secondary focusing electrode and the bowl-shaped focusing electrode composed by the curved blade. An electrical connection plate is further connected with the secondary focusing electrode. The electrical connection plate passes through the insulating component and the bottom plate, extends below the bottom plate to lead the secondary focusing electrode out and electrically connected with the lead system of the photomultiplier tube. Through the implementation of the present invention, the photoelectron collection and detection efficiency can be improved.

The invention relates to a self-current-stabilizing micropulse electronic gun based on secondary electron multiplying. The electronic gun comprises an inwards concave cavity, a groove is formed in the bottom of the inwards concave cavity, a round hole is formed in the top of the inwards concave cavity, and the cathode stretches into the round hole; a channel through the groove is formed in the arc-shaped end face side of the inwards concave cavity, and a rectangular hole is formed in the rectangular end face side; a through hole is formed in the center of a round cover plate at the top of a grid cover plate, and the grid cover plate is clamped on a stepped structure on the periphery of the groove; threads are arranged on the inner wall face of a hollow pipe at the bottom of the grid cover plate; two water tank outer shells are welded to the two ends of the cavity respectively and provided with holes; a first pipeline flange is connected with the cathode, penetrates through the holes of the water tank outer shells and then is tightly connected with the top of the inwards concave cavity, a second pipeline flange and the hollow pipe at the bottom of the grid cover plate are welded together, and a third pipeline flange is welded to the arc-shaped end face of the inwards concave cavity; a tapered waveguide outlet end is welded to the rectangular end face of the inwards concave cavity, and a tapered waveguide flange is welded to the inlet end.

A high-power photomultiplier is characterized by including an incident light source, a photocathode, a primary electron emitter, a secondary electron emitter, a tertiary electron emitter, a quaternary electron emitter, a photocurrent output device, a grounding protection device, a primary current attenuation, a secondary current attenuation, a tertiary current attenuation and a quaternary current attenuation; wherein the primary electron emitter is made of a cesium antimonide nickel alloy electrode material, the second electron emitter is made of a lanthanum oxide alloy electrode material, the tertiary electron emitter and the quaternary electron emitter are made of a cobalt oxide copper beryllium alloy electrode material, the photocurrent output device is provided with a beam filter membrane with the thickness of 2.98 micrometers, and the beam filter membrane is an N-metachromicacid europium iodide nano composite filter membrane.

The present invention relates to a photomultiplier having a structure for performing a high gain and achieving a higher productivity in a state keeping or improving an excellent high-speed response. In the photomultiplier, an electron-multiplying unit accommodated in a sealed container has a structure that enables an integrated assembly of a focusing electrode, an accelerating electrode, a dynode unit, and an anode. Specifically, the accelerating electrode composes a lower electrode and an upper electrode fixed each other by welding at a plurality of spots. The lower electrode is held at a pair of insulating support members in a state for the pair of insulating support members to grasp unitedly it together with the dynode unit and anode. Additionally, the upper electrode has one or more slit grooves for pinching a part of the pair of insulating support members. With this construction, the accelerating electrode constituted by the lower electrode and upper electrode is fixed at the pair of insulating support members in a state to be aligned with high accuracy by using the pair of insulating support members as a reference member.

The invention belongs to the technical field of photoelectric devices, and relates to an electrode lead unit, a vacuum photoelectric device and a manufacturing method thereof. The electrode lead unit comprises a glass substrate, a glass package and multiple electrode leads; the glass package is welded on the surface of the glass substrate; the electrode leads are distributed on the welding surface between the glass package and the glass substrate; and one end of each electrode lead is located at the inner side of the glass package, and the other end of the electrode lead is located at the outer side of the glass package. Due to the manufactured electrode lead unit and no limitation from the diameter of a Kovar alloy wire at the tail end of an anode, a vacuum photoelectric device with hundreds of readout channels can be manufactured. The size of the electrode can reach tens of microns minimally, manufacturing of a high-density electrode lead can be realized, the electrode can be applied to multiple vacuum photoelectric devices such as a hybrid photodetector and a multi-anode photomultiplier tube, and has a wide application prospect in multiple fields such as high-energy physics, cosmic exploration, low light level night vision, and medical instruments.