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28 May 2004 Laser performance operations model (LPOM)
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The Laser Performance Operations Model (LPOM) has been developed to provide real-time predictive capabilities for the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. LPOM uses diagnostic feedback from previous NIF shots to maintain accurate energetics models for each of the 192 NIF beamlines (utilizing one CPU per laser beamline). This model is used to determine the system set-points (initial power, waveplate attenuations, laser diagnostic settings) required for all requested NIF shots. In addition, LPOM employs optical damage models to minimize the probability that a proposed shot may damage the system. LPOM also provides post-shot diagnostic reporting to support NIF experimenters. LPOM was deployed prior to the first main laser shots in NIF in mid-2002 and has been used to set up the every laser shot in NIF's first quad of four laser beamlines. Real-time adjustments of the LPOM energetics parameters allows the LPOM team to predict total beam energies within 5%, and to provide energy balance among the four beamlines to within 2% for shots varying from 0.5 to 26 kJ (1w) per beamline. The LPOM has been a crucial tool in the commissioning of the first quad of NIF.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael J. Shaw, Wade H. Williams, Ronald K. House, and Christopher A. Haynam "Laser performance operations model (LPOM)", Proc. SPIE 5341, Optical Engineering at the Lawrence Livermore National Laboratory II: The National Ignition Facility, (28 May 2004);

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