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Abstract

Femtosecond electron bunches can be produced by laser plasma wakefield accelerators, with energy tunable from tens of MeV to a few GeV. In order to produce stable mono-energetic electron bunches, a critical issue is to control the injection of electron into the wakefield. The ionization injection is one of the most effective methods of controlling the injection, which is usually a continuous process. So, the electron bunches produced through ionization injection usually possess large energy spread. In order to optimize the ionization injection technique and produce stable monoenergetic wakefield electron beams, experimental studies are conducted on our 45 TW laser facility. In this work, a mixed injection mechanism assisted cascaded laser wakefield accelerator is presented. Based on a double-nozzle cascaded accelerator, the influences of ionization injection, shock wave front injection and their combination are experimentally studied. The results show that the lower threshold of the injection can be substantially reduced. The ionization injection is restricted within the shock wave front. As a result, mono-energetic electron bunches with reduced absolute energy spread can be stably produced. Under the most optimal conditions, the central energy and energy spread are (63.24 ± 6.12) MeV and (13.0 ± 3.9) MeV. The charge quantity of the electron bunches is (5.99 ± 3.10) pC. The minimum emitting anglular spread is (3.6 × 3.8) mrad.

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Corresponding author:Gu Yu-Qiu,yqgu@caep.cn

Funds:Project supported the Presidential Foundation of the China Academy of Engineering Physics (Grant No. 2014-1-017), the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. U1630246), the Science Challenge Project, China (Grant No. JCKY2016212A505), and the National Key Research and Development Program of China (Grant No. 016YFA0401100).

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Cited By

DownLoad: Full-Size Img PowerPoint

发次号	θ_x/mrad	θy/mrad	σ_x/mrad	σ_y/mrad
558	–25.5	28.9	8.5	5.6
559	–22.1	27.3	5.0	5.6
560	–23.5	23.3	6.2	4.8
561	–19.0	23.3	6.5	5.1
562	–18.1	24.2	3.8	3.6
563	–19.7	19.4	6.4	4.4

DownLoad: CSV

发次号	中心能量/MeV	电量/pC	能散FWHM/MeV
570	66.7	6.5	10
571	66.1	9.4	17
572	58.2	2.0	6.9
573	54.2	9.2	14.3
574	71	2.86	16.6

DownLoad: CSV

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Vol. 68, Issue 17 - 2019-09-05

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