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It is observed that the interaction of an intense ultra-short laser pulsewith an overdense gas jet results in the pulse collapse and the deposition of asignificant part of energy in a small and well localized volume in the risingpart of the gas jet, where the electrons are efficiently accelerated andheated. A collisionless plasma expansion over 150 microns at a sub-relativisticvelocity (~c/3) has been optically monitored in time and space, and attributedto the quasistatic field ionization of the gas associated to the hot electroncurrent. Numerical simulations in good agreement with the observations suggestthe acceleration in the collapse region of relativistic electrons, along withthe excitation of a sizeable magnetic dipole that sustains the electron currentover several picoseconds. Perspectives of ion beam generation at highrepetition rate directly from gas jets are discussed.

Short Intense Laser Pulse Collapse in Near-Critical Plasma