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Pulse shaping and energy storage capabilities of angularly multiplexed KrF laser fusion drivers

J. Appl. Phys. 106, 023103 (2009); doi:10.1063/1.3174444

Published 23 July 2009

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R. H. Lehmberg,1 J. L. Giuliani,2 and A. J. Schmitt2
1Research Support Instruments, Inc., Lanham, Maryland 20706, USA
2Plasma Physics Division, U.S. Naval Research Laboratory, Washington, DC 20375, USA
This paper describes a rep-rated multibeam KrF laser driver design for the 500  kJ Inertial Fusion test Facility (FTF) recently proposed by NRL, then models its optical pulse shaping capabilities using the ORESTES laser kinetics code. It describes a stable and reliable iteration technique for calculating the required precompensated input pulse shape that will achieve the desired output shape, even when the amplifiers are heavily saturated. It also describes how this precompensation technique could be experimentally implemented in real time on a reprated laser system. The simulations show that this multibeam system can achieve a high fidelity pulse shaping capability, even for a high gain shock ignition pulse whose final spike requires output intensities much higher than the ~4  MW/cm2 saturation levels associated with quasi-cw operation; i.e., they show that KrF can act as a storage medium even for pulsewidths of ~1  ns. For the chosen pulse, which gives a predicted fusion energy gain of ~120, the simulations predict the FTF can deliver a total on-target energy of 428  kJ, a peak spike power of 385  TW, and amplified spontaneous emission prepulse contrast ratios IASE/I<3×10−7 in intensity and FASE/F<1.5×10−5 in fluence. Finally, the paper proposes a front-end pulse shaping technique that combines an optical Kerr gate with cw 248  nm light and a 1  µm control beam shaped by advanced fiber optic technology, such as the one used in the National Ignition Facility (NIF) laser. ©2009 American Institute of Physics
History: Received 15 May 2009; accepted 11 June 2009; published 23 July 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/023103/1

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KEYWORDS and PACS

Keywords
PACS
  • 28.52.Cx
    Fusion reactor fueling, heating and ignition
  • 28.52.Lf
    Fusion reactor components and instrumentation
  • 52.57.Kk
    Fast laser ignition of compressed fusion fuels
  • 52.50.Jm
    Plasma production and heating by laser beams
  • 42.65.Re
    Ultrafast processes; optical pulse generation and pulse compression
  • 42.55.Lt
    Gas lasers including excimer and metal-vapor lasers
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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