Abstract: A device and a method for measuring proton beam source position and beamline center are disclosed. The device includes N quadrupole magnets, a laser, a target and a scintillation screen; the target and the scintillation screen are arranged in front of and behind the N-quadrupole lens, respectively; the N-quadrupole lens can be converted to a M-quadrupole lens; the position of proton beam after being focused by the N- or M-quadrupole lens on the scintillation screen is measured; according to the amplification factor and the proton beam position, the offset of the proton beam source from the beamline center, as well as the position of the beamline center on the scintillation screen are calculated; the disclosure can accurately determine the position of the beamline center and the proton beam source by the use of N quadrupole magnets, combined with a scintillation screen.

Abstract: A device and a method for measuring proton beam source position and beamline center are disclosed. The device includes N quadrupole magnets, a laser, a target and a scintillation screen; the target and the scintillation screen are arranged in front of and behind the N-quadrupole lens, respectively; the N-quadrupole lens can be converted to a M-quadrupole lens; the position of proton beam after being focused by the N- or M-quadrupole lens on the scintillation screen is measured; according to the amplification factor and the proton beam position, the offset of the proton beam source from the beamline center, as well as the position of the beamline center on the scintillation screen are calculated; the disclosure can accurately determine the position of the beamline center and the proton beam source by the use of N quadrupole magnets, combined with a scintillation screen.

Abstract: The present invention discloses an LED power shell, including a shell body integrally formed by a metal material, a power surface cover for sealing and covering the shell, and a terminal surface shell, wherein the power surface shell is provided with a baffle downwards bending into a bottom shell, the baffle divides the shell into a power cavity and a terminal cavity, the other three sides of the power surface shell are respectively provided with a bent edge matched with the shell, the periphery of the terminal surface shell is respectively provided with a bent edge matched with the shell, and the shell is connected with the power surface shell and the terminal surface shell through a clamping device. The LED shell according to the present invention has simple structure, is convenient to dismount, has low cost, and satisfies the diversified demands of customers.