Experimental demonstration of externally driven millimeter-wave particle accelerator structure
Experimental demonstration of externally driven millimeter-wave particle accelerator structure
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DOI：
10.1063/5.0011397
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发表时间：
2020-08-17
影响因子：
4
通讯作者：
Nanni, Emilio A.
中科院分区：
文献类型：
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作者：
Othman, Mohamed A. K.;Picard, Julian;Nanni, Emilio A.
我们报告了一个由高功率射频源供电的毫米波电子加速结构的实验演示。我们证明了可靠的耦合到毫米波加速器结构使用准光学设置的一个前所未有的射频功率高达575千瓦。这种驻波加速结构由单腔铜腔和高斯-TM 01模式转换器组成。加速器结构由110 GHz，10-ns长的射频脉冲供电。这些脉冲是使用激光驱动的硅开关从回旋振荡器的3 ms脉冲斩波而来的。我们显示出前所未有的高梯度高达230 MV/m，对应于超过520 MV/m的峰值表面电场。我们在用超过10（5）个脉冲调节腔后实现了这些结果。我们还报告了射频击穿率的初步测量，这是很重要的了解射频击穿物理在毫米波政权。这些结果开辟了许多前沿的应用不仅限于下一代粒子加速器，但也x射线产生，探测材料动力学，并在毫米波频率的非线性光-物质相互作用。
We report the experimental demonstration of a mm-wave electron accelerating structure powered by a high-power rf source. We demonstrate reliable coupling of an unprecedented rf power-up to 575kW into the mm-wave accelerator structure using a quasi-optical setup. This standing wave accelerating structure consists of a single-cell copper cavity and a Gaussian to TM01 mode converter. The accelerator structure is powered by 110GHz, 10-ns long rf pulses. These pulses are chopped from 3 ms pulses from a gyrotron oscillator using a laser-driven silicon switch. We show an unprecedented high gradient up to 230MV/m that corresponds to a peak surface electric field of more than 520MV/m. We have achieved these results after conditioning the cavity with more than 10(5) pulses. We also report preliminary measurements of rf breakdown rates, which are important for understanding rf breakdown physics in the millimeter-wave regime. These results open up many frontiers for applications not only limited to the next generation particle accelerators but also x-ray generation, probing material dynamics, and nonlinear light-matter interactions at mm-wave frequency.