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Dielectric Disk Accelerator for High Gradient Short Pulse Two-Beam Wakefield Acceleration

机译:用于高梯度短脉冲两束Wakefield加速的介电盘加速器

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In the last two decades, the theoretical and experimental investigations of dielectric accelerating structures for application to wakefield acceleration have predominantly used a dielectric-lined waveguide, due to its simple geometry (i.e. low fabrication cost). However, in comparison with the prevailing metallic disk-loaded accelerators, the dielectric-lined waveguide suffers from a lower Q-factor and lower shunt impedance. We are developing a new dielectric disk accelerator. The preliminary simulation shows that, even with 5×10-4 of loss tangent dielectric material (Er=50), we can achieve ~200 MΩ/m shunt impedance at 26 GHz traveling wave operation (the beam aperture is kept the same in the comparison), which is 4 times higher than those of the conventional dielectric loaded accelerator. The dielectric disk accelerator can overcome conventional limitations on high gradient, high efficiency dielectric accelerator, leading to a breakthrough in the performance of the two-beam accelerator, one of the most promising technologies in the category of advanced accelerator concepts for high energy physics research applications.
机译:在过去的二十年中,由于其简单的几何形状(即低制造成本),用于加速场加速的电介质加速结构的理论和实验研究主要使用了电介质衬里的波导。但是,与流行的金属磁盘加载加速器相比,衬有介质的波导的Q因子较低,分流阻抗较低。我们正在开发一种新的介质磁盘加速器。初步模拟显示,即使使用5×10 \ n -4\n损耗角正切介电材料(E \ n r \ n = 50),我们可以在26 GHz行波下实现〜200MΩ/ m的分流阻抗操作(光束孔径在比较中保持相同),是传统的带电介质加速器的4倍。介电盘加速器可以克服高梯度,高效率介电加速器的常规限制,从而导致两束加速器的性能取得突破,这是高能物理研究应用的高级加速器概念类别中最有希望的技术之一。

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