Measurements of the linac coherent light source laser heater and its impact on the x-ray free-electron laser performance

被引：123

作者：

Huang, Z. ^{[1
]}

Brachmann, A. ^{[1
]}

Decker, F. -J. ^{[1
]}

Ding, Y. ^{[1
]}

Dowell, D. ^{[1
]}

Emma, P. ^{[1
]}

Frisch, J. ^{[1
]}

Gilevich, S. ^{[1
]}

Hays, G. ^{[1
]}

Hering, Ph. ^{[1
]}

Iverson, R. ^{[1
]}

Loos, H. ^{[1
]}

Miahnahri, A. ^{[1
]}

Nuhn, H. -D. ^{[1
]}

Ratner, D. ^{[1
]}

Stupakov, G. ^{[1
]}

Turner, J. ^{[1
]}

Welch, J. ^{[1
]}

White, W. ^{[1
]}

Wu, J. ^{[1
]}

Xiang, D. ^{[1
]}

机构：

[1] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2010年 / 13卷 / 02期

关键词：

INSTABILITY;

D O I：

10.1103/PhysRevSTAB.13.020703

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：

The very bright electron beam required for an x-ray free-electron laser (FEL), such as the linac coherent light source (LCLS), is susceptible to a microbunching instability in the magnetic bunch compressors, prior to the FEL undulator. The uncorrelated electron energy spread in the LCLS can be increased by an order of magnitude to provide strong Landau damping against the instability without degrading the FEL performance. To this end, a "laser-heater'' system has been installed in the LCLS injector, which modulates the energy of a 135-MeV electron bunch with an IR-laser beam in a short undulator, enclosed within a four-dipole chicane. In this paper, we report detailed measurements of laser-heater-induced energy spread, including the unexpected self-heating phenomenon when the laser energy is very low. We discuss the suppression of the microbunching instability with the laser heater and its impact on the x-ray FEL performance. We also present the analysis of these experimental results and develop a three-dimensional longitudinal space charge model to explain the self-heating effect.

引用

页数：12

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