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- W2160996130 abstract "We report experimental results in which ultra-short duration (femtosecond) laser pulses from tabletop lasers are focused to intensities above 10/sup 19/ W/cm/sup 2/ onto either gas jets or thin solid-density films. At such extreme electromagnetic field strengths (10/sup 11/ V/cm), plasmas are formed in which the electrons oscillate relativistically, creating gigabar pressure. The displacement of electrons-but not the heavier ions-from the region of the laser focus drives large space-charge fields (exceeding 1 GeV/cm). For laser pulses that are short compared with a plasma period, this takes the form of a wakefield, which accelerates MeV energy beams of electrons. For pulses long compared with a plasma period, we show that a Coulomb explosion accelerates protons (or other ions) to energy in excess of 10 MeV in well-collimated beams. In both cases, not only is this acceleration gradient up to a thousand times greater than in radio-frequency accelerators, but we also found that their transverse geometrical emittances are at least comparable, e.g., up to 10/sup 10/ particles per pulse and divergence angles as low as 1 for electrons and 20 for protons. Additionally, the repetition rate of the electron gun is 10 Hz, a thousand-fold improvement over its past performance. In order to reduce the large electron energy spread, we show experimentally the injection of electrons into a laser-driven plasma wave by use of a separate synchronized laser pulse." @default.
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- W2160996130 date "2002-11-14" @default.
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- W2160996130 title "New developments in laser acceleration of beams" @default.
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- W2160996130 doi "https://doi.org/10.1109/pac.2001.987447" @default.
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