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Explore the utilization of KrF laser ignitors with short wavelength and deep penetration capabilities, allowing for increased pump duration and higher efficiency in energy output. Learn about the saturation of KrF amplifiers and the need for interferometric multiplexing to achieve the desired intensity. Discover critical issues like beam focusing and electron transport in the context of 3D ignition scenarios.
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Alternative fast ignition concepts: Using KrF laserIstván B Földes, KFKI RIPNP, Hungary KrF ignitors: Short wavelength, deep penetration without cone. The same amplifiers can be used with 20-30% increase of pump duration. Lower electron energy, higher efficiency: 1MeV from 1.8×1020W/cm2. Saturation of KrF amplifiers (6mJ/cm2): amplification of 1ps pulses may give the same energy but high power (nearly transform-limited pulse). Interferometric muliplexing needed: 2-beam may give 100J. Required intensity can be obtained in a single beam. Multiple beam focusing (F/32) of many (400) beams to a separate or to the same spot (r90m). Multiple beams on multiple spots: R=? assumes „corona ignition model” Multiple beam on single spot (or 2 spots) Critical issues: F/32 focusing requires 10% Help from self-focusing? electron transport in 3D ignition transport in 3D