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By employing a pair of partially overlapped supersonic gas jets, we made a separation of injection and acceleration stages of laser wakefield acceleration and produced stable, quasi-monoenergetic (10–30% FWHM) and tunable (50–300 MeV) electron beams.
We present calculations and results for frequency doubling on DiPOLE, a 7J 10 Hz Yb:YAG DPSSL, using DKDP, YCOB and LBO. The LBO crystal achieved the highest conversion efficiency of 65%.
kJ-class DPSSL systems with multi-Hz repetition rate for IFE and other laser-plasma based applications require an amplifier architecture with high efficiency and high gain. We present a concept based on cryogenically cooled ceramic Yb:YAG.
HiPER and ELI are two pan-European projects to establish large-scale laser research facilities. HiPER is dedicated to laser fusion energy research, ELI focuses the exploitation of ultra-short and ultra-intense laser pulses. Both systems will require DPSSL systems delivering ns pulses of kJ-scale energy at multi-Hz repetition rates.
400 MeV quasi-monoenergetic electron beams are produced from a wakefield driven by 70 TW, 30 fs laser pulses. To our knowledge, these beams have the highest brightness to date from any laser accelerator, and 1-2% stability.
We investigate use of laser-accelerated electron beams for high resolution long standoff, radiographic applications and detection of shielded dense materials. For first time, radiographs with sub-millimeter resolution; embedded gaps in dense materials are presented.
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