低能束空间电荷中和中的纵向离子清除机制

IF 1.5 3区物理与天体物理 Q3 PHYSICS, NUCLEAR

Physical Review Accelerators and Beams Pub Date : 2024-05-20 DOI:10.1103/physrevaccelbeams.27.050101

C. A. Valerio-Lizarraga

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引用次数: 0

摘要

在电子枪中，产生高强度光束的代价是增加残余气体电离产生的二次离子数量，这可能是阴极寿命的一个限制因素。然而，人们往往忽视了光束产生的纵向电势可能是影响二次离子向光源漂回并限制最大光束强度的主要因素。本文利用三维模拟展示了被截留离子的通量如何取决于光束参数。结果提供了一个实用框架，可作为电子枪焦点设计的指导，以减轻离子反轰击。美国物理学会出版 2024

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Longitudinal ion-clearing mechanism in space-charge neutralization of low energy beams

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Longitudinal ion-clearing mechanism in space-charge neutralization of low energy beams

In electron guns, generating high-intensity beams comes with the cost of increasing the number of secondary ions produced by the residual gas ionization which can be a limiting factor in the cathode lifetime. However, it is often overlooked that the longitudinal potential generated by the beam can be the main factor influencing secondary ions to drift back toward the source and limit the maximum beam intensity. Using 3D simulations, this paper shows how the flux of trapped ions depends on the beam parameters. The results provide a practical framework that can be used as a guide in the design of the electron gun focal point to mitigate the ion back bombardment. Published by the American Physical Society 2024

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来源期刊

Physical Review Accelerators and Beams Physics and Astronomy-Surfaces and Interfaces

CiteScore

3.90

自引率

23.50%

发文量

158

审稿时长

23 weeks

期刊介绍： Physical Review Special Topics - Accelerators and Beams (PRST-AB) is a peer-reviewed, purely electronic journal, distributed without charge to readers and funded by sponsors from national and international laboratories and other partners. The articles are published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. It covers the full range of accelerator science and technology; subsystem and component technologies; beam dynamics; accelerator applications; and design, operation, and improvement of accelerators used in science and industry. This includes accelerators for high-energy and nuclear physics, synchrotron-radiation production, spallation neutron sources, medical therapy, and intense-beam applications.