Two-plane focusing of high-space-charge sheet electron beams using periodically cusped magnetic fields
Two-plane focusing of high-space-charge sheet electron beams using periodically cusped magnetic fields
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DOI：
10.1063/1.370132
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发表时间：
1999-04
影响因子：
3.2
通讯作者：
M. Basten;J. Booske
中科院分区：
文献类型：
--
作者：
M. Basten;J. Booske
数值分析和理论分析表明，利用周期性会切磁场（PCM）可以实现有限宽、椭圆截面、高空间电荷（低电压、高电流密度）片状电子束的稳定双平面聚焦。聚焦高空间电荷片状束的磁场强度要求在现代永磁体技术的技术能力范围内。偏置极PCM叠层和与周期四极磁铁（PQM）边缘阵列相结合的PCM叠层都被证明对两平面片状束流限制有效。PCM-PQM混合配置提供了固有的优势，用于独立调整限制场，以实现两个横向维度上的光束匹配（最小涟漪）。偏置极配置为真空电子微波器件等应用提供了开放侧接入的优势。它还表明，PCM聚焦片光束包络稳定性服从的标准相当于以前确定的。
Numerical and theoretical analyses show that stable, two-plane focusing of finite width, elliptical cross section, sheet electron beams with high space charge (low voltage, high current density) can be accomplished using periodically cusped-magnetic (PCM) fields. Magnetic field strength requirements for focusing high-space-charge sheet beams are within technological capabilities of modern permanent magnet technology. Both an offset-pole PCM stack and a PCM stack combined with a periodic quadrupole magnet (PQM) edge array are shown to be effective for two-plane sheet beam confinement. The PCM-PQM hybrid configuration offers inherent advantages for independent adjustment of confinement fields to achieve beam matching (minimum ripple) in both transverse dimensions. The offset-pole configuration offers the advantage of open-side access for applications such as vacuum electronic microwave devices. It is also shown that PCM-focused sheet beam envelope stability obeys criteria equivalent to that previously ident...