Demonstration of nonlinear-energy-spread compensation in relativistic electron bunches with corrugated structures.
Demonstration of nonlinear-energy-spread compensation in relativistic electron bunches with corrugated structures.
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DOI：
10.1103/physrevlett.114.114801
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发表时间：
2015-03
影响因子：
8.6
通讯作者：
F. Fu;Rui Wang;P. Zhu;Lingrong Zhao;Tao Jiang;Chao Lu;Shengguang Liu;Libing Shi;Lixin Yan-Lixin
中科院分区：
文献类型：
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作者：
F. Fu;Rui Wang;P. Zhu;Lingrong Zhao;Tao Jiang;Chao Lu;Shengguang Liu;Libing Shi;Lixin Yan-Lixin
高质量的电子束具有平坦的能量和电流分布，对于许多基于加速器的科学设施，如自由电子激光器和MeV超快电子衍射和显微镜至关重要。在这封信中，我们报告了使用波纹结构来补偿由射频场曲率造成的光束非线性能量啁啾，从而显着减少光束能量扩展。通过使用一对具有正交取向的波纹结构，我们表明，四极尾场，否则，增加束流发射度，可以有效地取消。这项工作还将波纹结构的应用扩展到低束流电荷（几pC）和低束流能量（几MeV）制度，并可能在许多基于加速器的设施中产生强烈的影响。
High quality electron beams with flat distributions in both energy and current are critical for many accelerator-based scientific facilities such as free-electron lasers and MeV ultrafast electron diffraction and microscopes. In this Letter, we report on using corrugated structures to compensate for the beam nonlinear energy chirp imprinted by the curvature of the radio-frequency field, leading to a significant reduction in beam energy spread. By using a pair of corrugated structures with orthogonal orientations, we show that the quadrupole wakefields, which, otherwise, increase beam emittance, can be effectively canceled. This work also extends the applications of corrugated structures to the low beam charge (a few pC) and low beam energy (a few MeV) regime and may have a strong impact in many accelerator-based facilities.