Tunable High-Intensity Electron Bunch Train Production Based on Nonlinear Longitudinal Space Charge Oscillation

被引：46

作者：

Zhang, Zhen ^{[1
]}

Yan, Lixin ^{[1
]}

Du, Yingchao ^{[1
]}

Zhou, Zheng ^{[1
]}

Su, Xiaolu ^{[1
]}

Zheng, Lianmin ^{[1
]}

Wang, Dong ^{[1
]}

Tian, Qili ^{[1
]}

Wang, Wei ^{[1
]}

Shi, Jiaru ^{[1
]}

Chen, Huaibi ^{[1
]}

Huang, Wenhui ^{[1
]}

Gai, Wei ^{[1
,2
]}

Tang, Chuanxiang ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[2] Argonne Natl Lab, Lemont, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 18期

基金：

中国国家自然科学基金;

关键词：

TERAHERTZ; GENERATION; BEAM; ACCELERATION; RADIATION;

D O I：

10.1103/PhysRevLett.116.184801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-intensity trains of electron bunches with tunable picosecond spacing are produced and measured experimentally with the goal of generating terahertz (THz) radiation. By imposing an initial density modulation on a relativistic electron beam and controlling the charge density over the beam propagation, density spikes of several-hundred-ampere peak current in the temporal profile, which are several times higher than the initial amplitudes, have been observed for the first time. We also demonstrate that the periodic spacing of the bunch train can be varied continuously either by tuning launching phase of a radiofrequency gun or by tuning the compression of a downstream magnetic chicane. Narrow-band coherent THz radiation from the bunch train was also measured with mu J-level energies and tunable central frequency of the spectrum in the range of similar to 0.5 to 1.6 THz. Our results pave the way towards generating mJ-level narrow-band coherent THz radiation and driving high-gradient wakefield-based acceleration.

引用

页数：5

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