Analysis of shot noise suppression for electron beams

被引：18

作者：

Ratner, Daniel ^{[1
]}

Huang, Zhirong ^{[2
]}

Stupakov, Gennady ^{[2
]}

机构：

[1] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[2] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2011年 / 14卷 / 06期

关键词：

UNDULATOR; LASERS;

D O I：

10.1103/PhysRevSTAB.14.060710

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Shot noise can affect the performance of free-electron lasers (FELs) by driving instabilities (e.g., the microbunching instability) or by competing with seeded density modulations. Recent papers have proposed suppressing shot noise to enhance FEL performance. In this paper we use a one-dimensional (1D) model to calculate the noise amplification from an energy modulation (e.g., electron interactions from space charge or undulator radiation) followed by a dispersive section. We show that, for a broad class of interactions, selecting the correct dispersive strength suppresses shot noise across a wide range of frequencies. The final noise level depends on the beam's energy spread and the properties of the interaction potential. We confirm and illustrate our analytical results with 1D simulations.

引用

页数：13

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