研究目的
Investigating the acceleration of electrons to MeV energies from a Kr cluster jet irradiated by a relativistic femtosecond laser pulse and the effects of transform-limited laser pulses on the generation of hot electrons.
研究成果
The study demonstrated the efficient production of high-energy electrons from Krypton clusters using subterawatt femtosecond laser radiation. The introduction of a positive chirp significantly enhanced the hot electron flux and energy. The results suggest the potential for creating relativistic electron beams with adjustable parameters for various applications.
研究不足
The study was limited by the fluctuations in electron beam generation from shot to shot, indicating that the experiments were near the threshold for efficient particle acceleration. The spatial resolution of Thomson scattering was insufficient to identify peculiarities in successful pulses.
1：Experimental Design and Method Selection:
The study involved irradiating a Kr cluster jet with a relativistic femtosecond laser pulse to study electron acceleration. The methodology included the use of transform-limited and chirped laser pulses to observe their effects on electron acceleration.
2：Sample Selection and Data Sources:
A pulsed valve with a conical nozzle was used to form a Kr cluster jet. The density of the gas atoms and the ionization state were estimated based on the nozzle's critical-to-output ratio and the laser intensity.
3：List of Experimental Equipment and Materials:
The experiment utilized a Ti:Sa laser system, an off-axis parabola for focusing, a vacuum chamber, a pulsed valve with a conical nozzle, and diagnostic tools including Thomson scattering, a Lanex screen, and a Medipix-based spectrometer.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused inside a vacuum chamber onto the Kr cluster jet. The position of the nozzle was adjusted for optimal interaction. The effects of laser pulse duration and chirp on electron acceleration were studied.
5：Data Analysis Methods:
The energy spectra of electrons were measured using a Medipix-based spectrometer. The effective temperature of hot electrons was evaluated by fitting the tail of the spectrum.
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