波纹结构相对论电子束团非线性能散补偿的演示
Demonstration of nonlinear-energy-spread compensation in relativistic electron bunches with corrugated structures
摘要：
具有能量和电流平坦分布的高质量电子束对于许多基于加速器的科学设备（例如自由电子激光和MeV超快电子衍射和显微镜）是至关重要的。在这封信中，我们报告使用波纹结构，以补偿由射频场的曲率压印的光束非线性能量啁啾，导致光束能量扩散显着减少。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。
英文摘要：
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 wake fields 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.
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