3D gain modeling of LMJ and NIF amplifiers

Geoffroy LeTouze; Olivier Cabourdin; J. F. Mengue; Mireille Guenet; Eric Grebot; Stephane E. Seznec; Kenneth S. Jancaitis; Christopher D. Marshall; Luis E. Zapata; A. E. Erlandson

doi:10.1117/12.354177

23 July 1999 3D gain modeling of LMJ and NIF amplifiers

Geoffroy LeTouze, Olivier Cabourdin, J. F. Mengue, Mireille Guenet, Eric Grebot, Stephane E. Seznec, Kenneth S. Jancaitis, Christopher D. Marshall, Luis E. Zapata, A. E. Erlandson

Author Affiliations +

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354177
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

A 3D ray-trace model has been developed to predict the performance of flashlamp pumped laser amplifiers. The computer program, written in C++, includes a graphical display option using the Open Inventor library, as well as a parser and a loader allowing the user to easily model complex multi-segment amplifier systems. It runs both on a workstation cluster at LLNL, and on the T3E Cray at CEA. We will discuss how we have reduce the required computation time without changing precision by optimizing the parameters which set the discretization level of the calculation. As an example, the sample of calculation points is chosen to fit the pumping profile through the thickness of amplifier slabs. We will show the difference in pump rates with our latest model as opposed to those produced by our earlier 2.5D code AmpModel. We will also present the results of calculations which model surfaces and other 3D effects such as top and bottom refelcotr positions and reflectivity which could not be included in the 2.5D model. This new computer model also includes a full 3D calculation of the amplified spontaneous emission rate in the laser slab, as opposed to the 2.5D model which tracked only the variation in the gain across the transverse dimensions of the slab. We will present the impact of this evolution of the model on the predicted stimulated decay rate and the resulting gain distribution. Comparison with most recent AmpLab experimental result will be presented, in the different typical NIF and LMJ configurations.

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Geoffroy LeTouze, Olivier Cabourdin, J. F. Mengue, Mireille Guenet, Eric Grebot, Stephane E. Seznec, Kenneth S. Jancaitis, Christopher D. Marshall, Luis E. Zapata, and A. E. Erlandson "3D gain modeling of LMJ and NIF amplifiers", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354177

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