研究目的
Investigating the nonlinear plasma wavelength scalings in a laser wake?eld accelerator.
研究成果
The study demonstrates that the nonlinear lengthening of the plasma wave train depends not solely on the laser peak intensity but also on the waist of the focal spot. This finding is inconsistent with analytical models but in agreement with quasi-3D PIC simulations. The results highlight the importance of developing new theoretical models for the transitional regime of laser wake?eld formation.
研究不足
The study is limited by the shot-to-shot pointing ?uctuation and the long-term drift of the drive laser, which affects the reliability of measuring the bubble size. Additionally, the analytical models are only accurate for driver strength a0 (cid:2) 1.
1：Experimental Design and Method Selection:
The study combines few-cycle shadowgraphy with interferometry to quantify plasma waves excited by the laser within the density range of GeV-scale accelerators.
2：Sample Selection and Data Sources:
The experiments were performed at the ATLAS laser in Garching, Germany, using a Ti:sapphire laser system.
3：List of Experimental Equipment and Materials:
ATLAS laser system, few-cycle probe pulses generated via self-phase modulation in an Ar-?lled hollow core ?ber, Nomarski-type interferometer.
4：Experimental Procedures and Operational Workflow:
The probe pulses were sent transversely through the interaction region and collected by a microscope objective to form shadowgrams or interferograms.
5：Data Analysis Methods:
The plasma wavelength was deduced from shadowgrams, and the electron density was independently determined by interferometry.
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