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Caractérisation spectrale et temporelle de l'émission X issue de l'interaction laser - agrégats

Abstract : Rare gas clusters are an intermediate state of matter between the bulk material and molecules. Studies of their interaction with short and intense laser pulses have demonstrated the ability to yield energetic (multi-keV) X-rays, fast ions, electrons and even neutrons, owing to high laser energy absorption rates. Among these emission processes, we have specifically studied the intensity, the spectrum and the duration of X-rays, as a first step for cluster-based X-ray source applications. In this context, a 800 fs rms time-resolution streak camera has been developed in collaboration with INRS-Energie (Varennes, Canada). We studied the behaviour of Ar clusters (with radii ranging from 15 to 30 nm) irradiated with short (30 fs - 5 ps) and intense (up to 1e17 W/cm2) laser pulses from the CELIA kHz laser system. The emission in energetic X-rays (> 2 keV) has been observed to be shorter than the temporal resolution. By inserting in our set-up a conical crystal, we have been able to measure the duration of the K-shell emission together with a spectral resolution in the 2.9 - 3.2 keV range. The measurements indicate that the duration of these lines is extremely short, less than the temporal resolution, with signal accumulation corresponding to up to a few 1e5 shots. We have further performed numerical simulations of both the laser-cluster interaction and the X-ray emission. Our calculations are based on a nanoplasma model and a time-dependant collisional-radiative code. Calculated time-resolved X-ray spectra seem to reproduce both the short duration emission and the observed high ionic charge state.
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  • HAL Id : tel-00720164, version 1

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Christophe Bonté. Caractérisation spectrale et temporelle de l'émission X issue de l'interaction laser - agrégats. Physique des plasmas [physics.plasm-ph]. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00720164⟩

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