Transverse and longitudinal space-charge-induced broadenings of ultrafast electron packets -: art. no. 094910

被引：32

作者：

Collin, S ^{[1
]}

Merano, M ^{[1
]}

Gatri, M ^{[1
]}

Sonderegger, S ^{[1
]}

Renucci, P ^{[1
]}

Ganière, JD ^{[1
]}

Deveaud, B ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Photon & Elect Quant, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 98卷 / 09期

关键词：

D O I：

10.1063/1.2128494

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High brightness ultrafast electron sources are limited by space-charge effects. In the high-electron-density regime, Coulomb repulsion induces both transverse and longitudinal broadenings of electron packets. We describe a three-dimensional mean-field model, which takes into account Coulomb repulsion in all directions. Measurements of spatial electron pulse widths are carried out after extraction from a photoemission electron gun. Experiments and simulation results are in very good agreement. Coulomb repulsion effects are found to occur close to the photocathode in the extraction region. The correlation between transverse and temporal broadenings of electron packets is discussed and gives the limits for the generation of high-electron-density ultrafast electron pulses. Pulses of temporal length of about 2 ps and a diameter of about 30 mu m should be obtained. (c) 2005 American Institute of Physics.

引用

页数：6

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