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arXiv 1301.4673physics.acc-ph
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紧凑型直线对撞机加速器原型结构中射频击穿对束流的影响

Effects of rf breakdown on the beam in the Compact Linear Collider prototype accelerator structure

A. Palaia, M. Jacewicz, R. Ruber, V. Ziemann, W. Farabolini

摘要:

了解高梯度加速器结构中的RF击穿对加速束的影响是紧凑型直线对撞机(CLIC)发展中的一个极其相关的方面,也是CERN CLIC测试设施3的双束测试台解决的主要问题之一。在RF击穿期间,产生大的电磁场,并且产生寄生磁场,寄生磁场与加速射束相互作用,影响其轨道和能量。我们在这里讨论的测量在CLIC原型结构中加速的电子束上观察到的这种效应。在纳秒时间尺度上的束流列车的轨迹的测量显示快速的变化,对应的击穿,我们比较与测量的相对束点在一个闪烁的屏幕上。我们确定不同的故障情况下,我们提供了一个解释的基础上,也在加速器结构的输入和输出端口的功率测量。最后,我们提出了分布的观察到的变化的幅度在束轨道,我们讨论了它的相关性与RF功率和击穿位置的加速器结构。

英文摘要:

Understanding the effects of RF breakdown in high-gradient accelerator structures on the accelerated beam is an extremely relevant aspect in the development of the Compact Linear Collider (CLIC) and is one of the main issues addressed at the Two-beam Test Stand at the CLIC Test Facility 3 at CERN. During a RF breakdown large electro-magnetic fields are generated and produce parasitic magnetic fields which interact with the accelerated beam affecting its orbit and energy. We discuss here measurements of such effects observed on an electron beam accelerated in a CLIC prototype structure. Measurements of the trajectory of bunch-trains on a nanosecond time-scale showed fast changes in correspondence of breakdown which we compare with measurements of the relative beam spots on a scintillating screen. We identify different breakdown scenarios for which we offer an explanation based also on measurements of the power at the input and output ports of the accelerator structure. Finally we present the distribution of the magnitude of the observed changes in the beam orbit and we discuss its correlation with RF power and breakdown location in the accelerator structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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