期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.055002
关键词
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资金
- DFG [TR18 A12, B9, KA 2869/2-1]
- BMBF [05K10SJ2, 03ZIK052]
- European Regional Development Fund (EFRE)
- STFC [ST/J002062/1]
- EPSRC [EP/H00601X/1]
- LASERLAB-EUROPE (EC's Seventh Framework Programme) [284464]
- UK EPSRC [EP/G054940/1, EP/G055165/1, EP/G056803/1]
- EPSRC [EP/G055165/1, EP/H00601X/1, EP/I014462/1, EP/G054940/1, EP/G056803/1] Funding Source: UKRI
- STFC [ST/J002062/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1102540, EP/I014462/1, EP/H00601X/1, EP/G056803/1, EP/G054940/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/J002062/1, ST/J002062/1 John Adams Inst] Funding Source: researchfish
We present few-femtosecond shadowgraphic snapshots taken during the nonlinear evolution of the plasma wave in a laser wakefield accelerator with transverse synchronized few-cycle probe pulses. These snapshots can be directly associated with the electron density distribution within the plasma wave and give quantitative information about its size and shape. Our results show that self-injection of electrons into the first plasma-wave period is induced by a lengthening of the first plasma period. Three-dimensional particle-in-cell simulations support our observations.
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