38results about How to "Reduce beam-loss" patented technology

A waveguide structure includes a metal layer of a predetermined size on a substrate, a lower clad layer on the structure completely covering the metal layer, a core layer of a predetermined size on the lower clad layer at the location corresponding to the metal layer, and an upper clad layer thereon completely covering the core layer.

A hologram recorder (A2) includes: a light source (10) for emitting a coherent beam; a spatial light modulator (20) provided with unit areas having a plurality of beam reflection elements (21) to reflect the beam from the light source (10) in a main direction as a signal beam or a cut-off direction; and a signal beam optical system (30, 31) for directing the signal beam to the hologram recording medium (B). The recorder (A2) further includes: a wavefront reshaper (40, 41, 42) for condensing the beams thinned out in the cut-off direction by the beam reflection element (21) of the modulator (20), and reshaping the wavefront of the condensed beams; and a reference beam optical system (50, 51) for directing the beam from the reshaper (40, 41, 42) to the recording medium (B) as a reference beam to be shone in an overlapping manner with the signal beam.

The present invention addresses the problem of providing a graphite sheet for a beam sensor with which excellent yield can be obtained during laser processing. The graphite sheet for a beam sensor according to the present invention is characterized in that the a-b plane surface does not include eye-shaped protrusions.

The invention discloses a plasma window windowless seal-based liquid-state metal spallation neutron target device. The liquid-state metal spallation neutron target device comprises a plasma window and a liquid-state metal target, wherein the plasma window is arranged at the front end of the liquid-state metal target; the liquid-state metal target further comprises a liquid container; a liquid-state metal target material is held in the liquid container; a high-pressure cavity, a heat exchanger and a liquid-state metal circulating pipeline are arranged in the liquid container; the high-pressure cavity is arranged on the top of the liquid container; an opening is formed in the center of the bottom of the high-pressure cavity; a particle beam is in contact with a part bombarded by the beam through the opening; the heat exchanger is arranged on the inner wall of the liquid container to discharge heat to the exterior; and the metal liquid circulates in the liquid container through the liquid-state metal circulating pipeline. According to the plasma window windowless seal-based liquid-state metal spallation neutron target device, windowless seal of the liquid-state metal target is realized; the beam loss of the particle beam in a passage of the plasma window is reduced; the gasification of the liquid-state metal is reduced; and the steam of the metal entering a vacuum pipeline is reduced.

The invention relates to a universal light ion tumor treatment device, comprising: an ion source, an ion source enclosure, an air inlet pipe, an evaporation furnace and a waveguide arranged in the housing; a linear injector, a linear injector The input end of the synchrotron is connected to the output end of the ion source through a low-energy beam line. The linear injector includes an acceleration cavity and a magnetic focusing element sleeved outside the acceleration cavity; for a synchrotron, the input end of the synchrotron is connected to a linear ion source through a medium-energy beam line. The output end of the injector is connected, and the beam input end of the synchrotron is provided with an injection cutting magnet, an injection convex rail magnet and an injection electrostatic deflection plate; the treatment terminal is connected with the synchrotron through a high-energy beam line. The device of the present invention can not only use protons for whole body therapy, but also can use 3 He, 4 He, 7 Li and other light ion beams are used for superficial (≤8cm) tumor treatment.

The invention relates to a vacuum exhaust system of a superconducting cyclotron. The vacuum exhaust system comprises a first exhaust passage, a second exhaust passage and a third exhaust passage, wherein the first exhaust passage is arranged in a high-frequency inner rod (7) of a high-frequency system of the superconducting cyclotron; the second exhaust passage is arranged between the high-frequency inner rod (7) of the high-frequency system and a high-frequency outer conductor (4); the third exhaust passage is arranged between the high-frequency outer conductor (4) of the superconducting cyclotron and a main magnet cover plate (2); and the first exhaust passage, the second exhaust passage and the third exhaust passage all carry out exhausting through a D plate (5) arranged at the end part of the high-frequency inner rod (7). By the vacuum exhaust system of the superconducting cyclotron, a plurality of vacuum exhaust passages are arranged according to the structural design characteristic of the high-frequency system, so that conductance of vacuum exhausting of the superconducting cyclotron is improved; the vacuum pumping rate of the superconducting cyclotron is improved; the beam loss is reduced; and the beam quality is improved.

The invention discloses a strong magnetic field synchronous cyclotron and a magnetic field supplementing method thereof, wherein the magnetic pole of an accelerator is of a circumferential structure,and the surface of the magnetic pole is a continuous curve; the method comprises the following steps of acquiring the actually needed magnetic field supplementing amount; in the radius range capable of being processed, enabling the continuous curve to be equivalent to a series of rectangular blocks with the fixed radial width and the height to be solved, and constructing a shape function of the continuous curve, wherein the shape function represents the variation of the magnetic field corresponding to the rectangular blocks; calculating the shape function of the unit height at each radius value position; performing discretization on the actually needed magnetic field supplementing amount, and working out the heights of the rectangular blocks based on the calculated shape function of the unit height at each radius value position and the discretized magnetic field supplementing amount through a function fitting algorithm; and machining the surface of the magnetic pole according to the obtained heights of the rectangular blocks. According to the method, correction of the specified magnetic field amount is realized by adopting a mode of processing the magnetic pole surface curve, the matching degree of the magnetic field and the high-frequency curve is finally improved, and the beam loss is lowered.

The invention relates to an accelerator, aims at solving the problem that an existing electronic accelerator is low in average beam current power and cannot meet the using demand of the fields of material irradiation and the like, meanwhile gives consideration to using economical efficiency and provides an electronic helical accelerator. The electronic helical accelerator comprises a radio-frequency resonance cavity, a pair of ridge-shaped electrodes, a four-pole magnet, a deflection magnet, a beam current motion pore passage, a pore passage inlet, a pore passage outlet and a grid-control electronic gun, wherein the beam current motion pore passage comprises a beam current deflection pore passage and ridge-shaped electrode beam current pore passages, the four-pole magnet and the deflection magnet are arranged outside the beam current deflection pore passage, electronic beams led from the pore passage inlet is subjected to acceleration, focusing and deflection in the beam current motion pore passage and finally jet out of the pore passage outlet, and the whole acceleration process is finished. The electronic helical accelerator is high in radio-frequency utilization efficiency and good in using economical efficiency, effectively improves the average beam current power and can well meet the using demand of the fields of material irradiation and the like.