Effects of Magnetic Field of Filament Current on Beam Current Quality of Electron Gun

doi:10.16080/j.issn1671-833x.2010.09.007

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Effects of Magnetic Field of Filament Current on Beam Current Quality of Electron Gun

更新时间：2025-10-30

- Effects of Magnetic Field of Filament Current on Beam Current Quality of Electron Gun
- Aeronautical Manufacturing Technology Issue 9, (2010)
- 作者机构：
  
  北京航空制造工程研究所高能束流加工技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2010.09.007
  CLC：
- Published：2010
- 稿件说明：
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胡元枧，左从进，郭光耀，付鹏飞. 灯丝电流磁场对电子枪束流品质的影响 [J]. 航空制造技术, 0, (): 81-84/90.

Effects of Magnetic Field of Filament Current on Beam Current Quality of Electron Gun[J]. Aeronautical Manufacturing Technology, 2010, (9).
胡元枧，左从进，郭光耀，付鹏飞. 灯丝电流磁场对电子枪束流品质的影响 [J]. 航空制造技术, 0, (): 81-84/90. DOI： 10.16080/j.issn1671-833x.2010.09.007.

Effects of Magnetic Field of Filament Current on Beam Current Quality of Electron Gun[J]. Aeronautical Manufacturing Technology, 2010, (9). DOI： 10.16080/j.issn1671-833x.2010.09.007.

摘要

在直热式电子枪中阴极灯丝电流将会产生磁场而影响电子运动轨迹。用一个简化模型来估算灯丝电流磁场导致束流产生的偏差，试验表明灯丝电流磁场确实影响了束流能量密度分布。把工程计算的结果与电子枪结构模拟的结果相比较所得结果是一致的。同时考虑灯丝加热电流跳动所带来的影响，试验表明随时间变化的磁场导致束流能量密度分散，焊缝质量下降，而且无法依靠静态合轴来消除。

Abstract

In directly heated electron guns

the cathode current generates a magnetic field that will change trajectories of electrons. The deflection of the electron beam caused by a cathode magnetic field can be estimated with an equivalent plane diode analytical model. It is shown that such a magnetic field really can affect the practical operating characteristics of an electron gun. The equations suggested for engineering calculation agree well with results of computer simulation for the real construction of a three-electrode gun. It is shown that a magnetic field which changes with time leads to a dispersive electron beam and causes a substantial decrease in the accuracy of positioning of the beam on the object

irremovable by the static alignment of the device.

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