An apparatus and method for magnetic control of an electron beam includes a control circuit having a first low voltage source and a second low voltage source. The control circuit also includes a first switching device coupled in series with the first low voltage source and configured to create a first current path with the first low voltage source when in a closed position and a second switching device coupled in series with the second low voltage source and configured to create a second current path with the second low voltage source when in a closed position. The control circuit further includes a capacitor coupled in parallel with an electron beam manipulation coil and positioned along the first and second current paths and a current source circuit electrically coupled to the electron beam manipulation coil and constructed to generate an offset current in the first and second current paths.

Apparatus and method for magnetic control of an electron beam

The linear array micro-nano focus X-ray source for a micro-nano CT system The linear array micro-nano focus X-ray source for the micro-nano CT system comprises cathodes 2, grids 3, anodes 4, focusing electrodes 5, magnetic solenoids 7, deflecting electrodes 8 and a target 9; the cathodes are used for producing electrons, the anodes are used for electron acceleration, the grids are arranged between the anodes and the cathodes and used for adjusting beam intensity of electron emitted by the cathodes, the focusing electrodes are used for completing first-time focusing of accelerated electrons, the magnetic solenoids are used for completing second-time focusing of the electrons, and the deflecting electrodes are used for controlling the position that the electrons hit on the target By means of the linear array micro-nano focus X-ray source for the micro-nano CT system, static CT scanning can be achieved, namely, a radiation source, an object to be detected and a detector are all in a static state, electron beam scanning substitutes for mechanical scanning, thus error caused by mechanical scanning can be avoided, small external disturbance, small size, light weight and fast detection speed can be obtained, and linear array micro-nano focus X-ray source for the micro-nano CT system can be applied to CT systems of different types

Linear array micro-nano focus X-ray source for micro-nano CT (computer tomography) system

The present application provides an external thermionic cathode distributed x-ray apparatus, including a vacuum box which is sealed at its periphery, where the interior thereof is high vacuum; a plurality of electron transmitting units arranged in a linear array and installed on the side wall of the vacuum box, where each electron transmitting unit is independent to each other; an anode installed in the center inside the vacuum box, where in the direction of length, the anode is parallel to the orientation of the electron transmitting unit, and in the direction of width, the anode has a predetermined angle with respect to the plane of the electron transmitting unit; a power supply and control system having a high voltage power supply and a focusing power supply; and a transmitting control means and a control system.

X-ray apparatus and a ct device having the same

The invention discloses a vacuum exhauster for an electron irradiation accelerator. The vacuum exhauster comprises a cross joint, wherein one end of the cross joint is connected with a molecular pump; and the molecular pump is connected a backing pump, and the other end of the cross joint is connected with an ion pump. The vacuum exhauster disclosed by the invention is used for solving the problem that the vacuum degree of the accelerator in the prior art cannot meet the requirement; two vacuum pumping systems capable of working simultaneously are arranged on the cross joint of the accelerator, so that the accelerator can obtain more satisfactory vacuum degree; and when the accelerator does not discharge beams, one vacuum pumping system is cut off by virtue of a flashboard valve, so that the normal working of the accelerator can be ensured, and thus the beam quality of the accelerator is ensured.

Vacuum exhauster for electron irradiation accelerator

The invention provides a method for welding a thin-walled cylinder with a magnet sleeved inside in a seal housing component. The welding efficiency of the aluminum alloy thin-walled seal housing component can be obviously improved through the method, quality is stable, a connector is bright, fusion is even, and continuous and compact welding beads can be formed. According to the technical scheme, the method comprises the following steps that the butt joint positions of inner and outer housing welding joints are closely attached through a clamp, and annular welding joint pulse electron beam tack welding is carried out on the circumferential seam crossing of an assembled component; a deflection distance occurring to an electron beam caused by Lorentz force is compensated by an electron beam deflection angle; the total heat input amount of the electron beam is controlled with the impulse waveform of the pulse electron beam, the impulse waveform is steep in the front and gentle in the back, and welding is carried out through heat generated when beam flow ascends and descends; under the condition that small pulse power is set and steam pressure is reduced, a pulse back edge is prolonged by 3-5s, slow reduction is carried out, the focal position of the electron beam is adjusted to be within the range 0.55mm below the surface of a workpiece, the surface of a connector to be welded is melted and integrally welded, and the continuous welding beads are formed.

Method for welding thin-walled cylinder with magnet sleeved inside in seal housing component

An acceleration and scanning integrated structure of fully impervious high vacuum electron beam belongs to the fields of radiation processing technology. It includes accelerating tube, drift tube, scanning electromagnet and scanning box equipped with ion pump, the scanning electromagnet is mounted on top of the scanning box and is connected with the drift tube by the ring flange two, and the top end of the drift tube is connected with the accelerating tube by the ring flange one. It characterized in that the accelerating tube and the scanning box are located and fixed by bracket, the ring flange two and the ring flange one are connected with each other by welding mode with featheredge flange, the accelerating tube adopts the standing wave acceleration structure equipped with exhaust orifice. Compared with current technology, the invention improves the stability and tightness of the accelerator and makes whole volume smaller; it can discharge air in high-temperature discharging furnace directly and leave out the endless vacuum exhaust cause of accelerating tube. It possesses engineering practicability.

Fully-sealed high vacuum electron beam accelerating and scanning integrated structure

The utility model relates to a piece of equipment capable of generating distributed X rays. The equipment comprises an electronic gun, a scanning device, a current-limiting device, and an anode target. Specifically, the scanning device is arranged by encircling a beam of the electronic gun and carries out deflection on the electronic beam. The current-limiting device has a plurality of holes in regular arrangement; and when the electronic beam is controlled by the scanning device to scan the current-limiting device, a pulse type electronic beam corresponding to a hole opening position is outputted below the current-limiting device. The anode target is arranged at the downstream of the current-limiting device; a uniform electric field is formed between the current-limiting device and the anode target by exerting a voltage at the anode target and the array type pulse electronic beam is accelerated; and the accelerated electronic beam bombards the anode target to generate X rays. An electromagnetic scanning mode is employed to change positions of a beam and a focus; the speed is fast; and the efficiency is high. Moreover, a design that current limiting is carried out before high energy acceleration is employed, so that not only beams distributed in an array mode are obtained but also the energy is saved and the heating of the current-limiting device can be effectively prevented.

Equipment capable of generating distributed X rays

The invention provides an irradiation device and its control method, which comprises an electron accelerator, a scanning case connected to the electron accelerator, a scanning magnet, a target and an electron beam emergence window positioned on the scanning case. The electronic beam emergence window is arranged at the left side or right side of the target. The beneficial effects of the invention are: the invention integrates the functions of the existing electron beam eduction type irradiation device and X-ray eduction irradiation device. When the scanning magnet works, the accelerator irradiation device educes the electron beam flow; when the scanning magnet does not work, the accelerator irradiation device educes X-ray. The invention can not only educe two irradiation sources comprising electron beam and X-ray, but also meet the requirements for processing the irradiation object with different volumes. Therefore, the invention can be adopted to enlarge the application scope nearly without increasing the cost, to improve the system safety performance and enhance the service life and utilization rate of the irradiation system.

Irradiation device and its control method

The invention discloses a cigarette tar reduction and harm removing method The method comprises the following steps: providing at least one radiation source; and irradiating a cigarette filter stick through the radiation source Through the irradiation on the cigarette filter stick, the absorbent in the filter stick such as acetate fibers is crosslinked so as to absorb more harmful substances such as tar through the acetate fibers with the same volume, thereby improving the filtrating efficiency and consequently reducing the intake of harmful substances during the smoking In addition, the invention also discloses a device for irradiating the cigarette filter stick The device comprises at least one irradiation source used for transmitting irradiation rays irradiating the cigarette filter stick, and a conveying device which is used for loading and conveying the cigarette filter stick to pass through an irradiation area produced by the irradiation source along the conveying direction Compared with the prior art, the tar reduction and harm removing method has the advantages of simple process, easy control, and the like As the method can be directly used on the prior cigarette production line, the method is suitable for large-scale application

Method and apparatus for reducing tar and eliminating harm in cigarette

The utility model provides a double-channel high-energy X-ray perspective imaging system. The double-channel high-energy X-ray perspective imaging system is used for simultaneously carrying out perspective imaging on checked objects in two channels by using only one electronic accelerator, two groups of X-ray beam currents and two sets of detector systems on the basis of the design of the electronic accelerator, a shielding collimation device, a first detector array, a second detector array and various mechanical combination structures. The double-channel high-energy X-ray perspective imaging system provided by the utility model can be designed to be in various specific types such as a fixed type, a combined type, a track movable type or a vehicle-mounted movable type. The double-channel high-energy X-ray perspective imaging system has the advantages of simple structure, low cost, strong functions, good image quality and the like.

Xinshui Yan

Papers

Fully-sealed high vacuum electron beam accelerating and scanning integrated structure

Equipment capable of generating distributed X rays

Irradiation device and its control method

Method and apparatus for reducing tar and eliminating harm in cigarette

Double-channel high-energy X-ray perspective imaging system