Periodic permanent magnetic structure
A technology of periodic permanent magnets and permanent magnets, applied in discharge tubes, electrical components, circuits, etc., can solve the problems of the structure description of the magnetic focusing system, the increase of the volume of the permanent magnet focusing system, and the disadvantage of miniaturization of the traveling wave tube, and achieve strong performance. Practical value, favorable for miniaturization, and excellent performance
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[0044] Example 1: figure 1 It is a periodic permanent magnet structure of three electron beam channels. figure 2 It is the structure of pole shoe (1). image 3 It is the structure of the positioning ring (2). The diameter of the electron beam channel in this embodiment is 2.2mm, the period of the periodic permanent magnet structure is 5.6mm, the peak value of the axial magnetic flux density of the electron beam channel is 218mT, and the ratio of the peak value of the radial magnetic flux density to the peak value of the axial magnetic flux density Is 0.52%. Figure 4 Is the magnetic flux density distribution diagram of the electron beam channel in this example on the central axis. Figure 4 in, B R Is the radial magnetic flux density, B Z / 100 is one hundredth of the axial magnetic flux density.
Example Embodiment
[0045] Example 2: Figure 5 It is a periodic permanent magnet structure of four electron beam channels. The diameter of the electron beam channel in this embodiment is 2.2mm, the period of the periodic permanent magnet structure is 5.6mm, the axial peak magnetic flux density of the electron beam channel is 218mT, and the radial magnetic The ratio of the peak flux density to the peak axial magnetic flux density is 1.02%. Image 6 Is the magnetic flux density distribution diagram on the central axis of the electron beam channel in this example. Image 6 in, B R Is the radial magnetic flux density, B Z / 100 is one hundredth of the axial magnetic flux density.
Example Embodiment
[0046] Example 3: Figure 7 It is a periodic permanent magnet structure with five electron beam channels. The diameter of the electron beam channel in this embodiment is 2.2 mm, the period of the periodic permanent magnet structure is 5.6 mm, the peak value of the axial magnetic flux density of the electron beam channel is 220 mT, and the radial magnetic flux The ratio of peak density to peak axial magnetic flux density is 1.78%; Figure 8 Is the magnetic flux density distribution diagram on the central axis of the electron beam channel in this example. Figure 8 in, B R Is the radial magnetic flux density, B Z / 100 is one hundredth of the axial magnetic flux density.
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