Axisymmetric periodic permanent magnet focusing system with prominent third spatial harmonics

A technology of periodic permanent magnet focusing and space harmonics, applied in the field of vacuum electronics, can solve the problem that it is not easy to increase the peak axial magnetic induction intensity of the periodic permanent magnet focusing system, and achieve good fluctuation of electron injection radius, suppression of fluctuation, electronic Note the effect of radius fluctuation suppression

Active Publication Date: 2019-08-30
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the smaller the period L of the periodic permanent magnet focusing system, the less likely it is to

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  • Axisymmetric periodic permanent magnet focusing system with prominent third spatial harmonics
  • Axisymmetric periodic permanent magnet focusing system with prominent third spatial harmonics
  • Axisymmetric periodic permanent magnet focusing system with prominent third spatial harmonics

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0045] In the traditional periodic permanent magnet focusing system, such as figure 1 As shown, the first permanent magnet 12 and the second permanent magnet 14 are simple hollow cylinders with uniform inner radius; and the first magnetic pole 11 and the second magnetic pole 13 have magnetic pole mouths 11a and 11b, and t is the first magnetic pole 11 and the second magnetic pole 13, the height of the magnetic pole tip; T is the height of the first permanent magnet 12 and the second permanent magnet 14.

[0046] The axial magnetic induction intensity distribution B(z) on the axis of the periodic permanent magnet focusing system of this configuration has a significant third space harmonic component, which can be expressed by...

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Abstract

The invention discloses an axisymmetric periodic permanent magnet focusing system with a prominent third spatial harmonics. The system comprises a plurality of permanent magnet focusing units with thelengths of L, each permanent magnet focusing unit comprises in order from left to right: a first magnetic pole (1); a first permanent magnet (2) having an N pole connected to the first magnetic pole(1); a second magnetic pole (3) connected to the S pole of the first permanent magnet (2); and a second permanent magnet (4) having an S pole connected to the second magnetic pole (3). The axisymmetric periodic permanent magnet focusing system with a prominent third spatial harmonics achieves the required peak axial magnetic field intensity Bm under the condition that the period L of the periodicpermanent magnet focusing system is not reduced, and simultaneously suppresses the fluctuation of the radius of an electron beam by utilizing the third spatial harmonics of the magnetic field distribution of the periodic permanent magnet focusing system on the axis, so that the aim of maintaining the stable passing of the electron beam is achieved.

Description

technical field [0001] The invention belongs to the field of vacuum electronics, and specifically relates to an axisymmetric periodic permanent magnet focusing system with prominent third space harmonics, which can more effectively provide vacuum electronic devices such as traveling wave tubes, return wave tubes, and distributed action klystrons. Electron beams that maintain steady transmission. Background technique [0002] Vacuum electronic devices such as traveling wave tubes, return wave tubes and distributed action klystrons all need one or more electron beams that can transmit stably. The electron beam maintenance system is also called the electron beam focusing system or the electron optical system of the electron beam. . In the absence of an electron beam maintenance system, there is a Coulomb repulsion between electrons inside the electron beam, which will cause the electron beam to gradually disperse and thus cannot be transported stably. The electron beam mainte...

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Application Information

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IPC IPC(8): H01J3/07H01J25/00H01J25/02
CPCH01J3/07H01J25/00H01J25/02
Inventor 王自成尚新文李联炳肖刘
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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