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本文描述了一个采用最佳耦合的行波反馈电子直线加速器,当加速器的束流负荷大幅度调节时,通过改变耦合器的耦合度,使其始终保持到负载端的射频功率为零。这将使加速器的束流负荷特性变得比较理想,也就是在束流小时,其束负荷特性曲线斜率较陡,而在束流大时却较平坦,这样既可以在小束流下具有较高的能量,又可以在低能时具有较大的束流。并在不同束流负荷下,都具有最佳的效率。本文还把三种类型的行波直线加速器(直馈的,固定耦合反馈的和最佳耦合反馈的加速器)的能量增益公式统一起来。这样分析更明了,设计更方便。
This paper describes a traveling wave feedback electron linear accelerator with optimal coupling. When the accelerator ’s beam load is drastically adjusted, the coupling degree of the coupler is changed to keep the RF power to zero at the load end. This will make the accelerator beam load characteristics become more ideal, that is, when the beam is small, the slope of the beam load characteristic curve is steep, but when the beam is large, it is relatively flat, so that both in the small beam flow has a higher Of the energy, but also can have a larger beam at low energy. And in different beam load, have the best efficiency. The paper also unifies the energy gain formulas of three types of traveling-wave linear accelerators (direct-fed, fixed-coupled feedback, and optimally coupled feedback). This analysis is more clear, the design more convenient.