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Short Intense Laser Pulse Collapse in Near-Critical Plasma

Abstract : It is observed that the interaction of an intense ultrashort laser pulse with a near-critical gas jet results in the pulse collapse and the deposition of a significant fraction of the energy. This deposition happens in a small and well-localized volume in the rising part of the gas jet, where the electrons are efficiently accelerated and heated. A collisionless plasma expansion over ∼150  μm at a subrelativistic velocity (∼c/3) has been optically monitored in time and space, and attributed to the quasistatic field ionization of the gas associated with the hot electron current. Numerical simulations in good agreement with the observations suggest the acceleration in the collapse region of relativistic electrons, along with the excitation of a sizable magnetic dipole that sustains the electron current over several picoseconds.
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Contributor : Victor Malka Connect in order to contact the contributor
Submitted on : Tuesday, June 16, 2015 - 9:32:47 AM
Last modification on : Friday, December 3, 2021 - 11:34:03 AM

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F. Sylla, Alessandro Flacco, S. Kahaly, M. Veltcheva, Agustin Lifschitz, et al.. Short Intense Laser Pulse Collapse in Near-Critical Plasma. Physical Review Letters, American Physical Society, 2013, 110 (8), pp.085001. ⟨10.1103/PhysRevLett.110.085001⟩. ⟨hal-01164023⟩



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