Simakov Evgenya I, Arsenyev Sergey A, Buechler Cynthia E, Edwards Randall L, Romero William P, Conde Manoel, Ha Gwanghui, Power John G, Wisniewski Eric E, Jing Chunguang
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA.
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60459, USA.
Phys Rev Lett. 2016 Feb 12;116(6):064801. doi: 10.1103/PhysRevLett.116.064801. Epub 2016 Feb 10.
We report experimental observation of higher order mode (HOM) wakefield suppression in a room-temperature traveling-wave photonic-band-gap (PBG) accelerating structure at 11.700 GHz. It has been long recognized that PBG structures have the potential for reducing long-range wakefields in accelerators. The first ever demonstration of acceleration in a room-temperature PBG structure was conducted in 2005. Since then, the importance of PBG accelerator research has been recognized by many institutions. However, the full experimental characterization of the wakefield spectrum and demonstration of wakefield suppression when the accelerating structure is excited by an electron beam has not been performed to date. We conducted an experiment at the Argonne Wakefield Accelerator test facility and observed wakefields excited by a single high charge electron bunch when it passes through a PBG accelerator structure. Excellent HOM suppression properties of the PBG accelerator were demonstrated in the beam test.
我们报告了在11.700吉赫兹的室温行波光子带隙（PBG）加速结构中高阶模式（HOM）尾场抑制的实验观测结果。长期以来，人们一直认识到光子带隙结构具有降低加速器中长程尾场的潜力。2005年首次在室温光子带隙结构中进行了加速演示。从那时起，许多机构都认识到了光子带隙加速器研究的重要性。然而，迄今为止，尚未对尾场频谱进行全面的实验表征，也未演示当加速结构由电子束激发时的尾场抑制情况。我们在阿贡尾场加速器测试设施进行了一项实验，观测了单个高电荷电子束通过光子带隙加速器结构时激发的尾场。在束流测试中展示了光子带隙加速器出色的高阶模式抑制特性。
