Experimental measurements of rf breakdowns and deflecting gradients in mm-wave metallic accelerating structures
Experimental measurements of rf breakdowns and deflecting gradients in mm-wave metallic accelerating structures
复制标题
毫米波金属加速结构中射频击穿和偏转梯度的实验测量
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Sami G. Tantawi
中科院分区：
文献类型：
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作者：
M. Forno;V. Dolgashev;G. Bowden;C. Clarke;M. Hogan;D. McCormick;A. Novokhatski;B. Spataro;S. Weathersby;Sami G. Tantawi
我们提出了亚太赫兹频率高梯度金属加速结构的实验研究，其中我们研究了射频击穿的物理原理。结构中的韦克场被超相对论电子束激发。我们首次对亚太赫兹加速腔中的梯度和金属真空射频击穿进行定量测量。当光束偏离轴时，除了纵向场之外，还会引起偏转场。我们通过观察电子束形状的位移和变化来测量偏转力。这种行为可用于亚飞秒光束诊断。
We present an experimental study of a high-gradient metallic accelerating structure at sub-THz frequencies, where we investigated the physics of rf breakdowns. Wakefields in the structure were excited by an ultrarelativistic electron beam. We present the first quantitative measurements of gradients and metal vacuum rf breakdowns in sub-THz accelerating cavities. When the beam travels off axis, a deflecting field is induced in addition to the longitudinal field. We measured the deflecting forces by observing the displacement and changes in the shape of the electron bunch. This behavior can be exploited for subfemtosecond beam diagnostics.