Demonstration of a 17-GHz, high-gradient accelerator with a photonic-band-gap structure.
Demonstration of a 17-GHz, high-gradient accelerator with a photonic-band-gap structure.
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DOI：
10.1103/physrevlett.95.074801
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发表时间：
2005-08
影响因子：
8.6
通讯作者：
E. Smirnova;A. Kesar;I. Mastovsky;M. Shapiro;R. Temkin
中科院分区：
文献类型：
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作者：
E. Smirnova;A. Kesar;I. Mastovsky;M. Shapiro;R. Temkin
报道了一种光子带隙(PBG)结构的高梯度电子加速器的测试。这种光子带隙结构限制了类似TM(01)的基模加速模式，但不支持高阶模式。光子晶体的不存在是光子带隙加速器的一大优势，因为它抑制了由尾迹场引起的危险的束流不稳定性。PBG结构被设计成一个由金属棒组成的三角形晶格，其中一个缺失的中心棒形成了一个缺陷，限制了TM(01)类模式，并允许电子束沿轴向传播。该六单元结构的设计频率为17.14 GHz。用2 mW、100 ns的脉冲激励PBG结构。一束16.5 MeV的电子束通过了PBG加速器。观测到的1.4 MeV电子束能量增益相当于35 mV/m的加速梯度，与理论符合得很好。
We report the testing of a high gradient electron accelerator with a photonic-band-gap (PBG) structure. The photonic-band-gap structure confines a fundamental TM(01)-like accelerating mode, but does not support higher-order modes (HOM). The absence of HOM is a major advantage of the PBG accelerator, since it suppresses dangerous beam instabilities caused by wakefields. The PBG structure was designed as a triangular lattice of metal rods with a missing central rod forming a defect confining the TM(01)-like mode and allowing the electron beam to propagate along the axis. The design frequency of the six-cell structure was 17.14 GHz. The PBG structure was excited by 2 MW, 100 ns pulses. A 16.5 MeV electron beam was transmitted through the PBG accelerator. The observed electron beam energy gain of 1.4 MeV corresponds to an accelerating gradient of 35 MV/m, in excellent agreement with theory.