8 December 1997 Development of long-lifetime low-contamination beam dumps for NIF
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Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294302
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France
Abstract
The laser architecture of the NIF beamlines requires small- area beam dumps to safely absorb back reflections from the output and leakage through the PEPC switch. The problems presented by these beam dumps are that fluences they must absorb are very large, beyond the damage threshold of any material, and ablation of beam dump materials potentially contaminates adjacent optical components. Full scale tests have demonstrated that a stainless steel beam dump will survive fluence levels and energies as high as 820 J/cm2 and 2.5 kJ, respectively. Small scale tests with tungsten, tantalum, and stainless steel have demonstrated erosion rates less than about 0.5 micrometers /shot, with stainless steel having the smallest rate. They also suggest that increased angles of incidence (>= 60 degree(s)) will greatly reduce the material ablated directly back along the beam path.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mary A. Norton, James E. Murray, Charles D. Boley, David Milam, Walter D. Sell, Michael D. Feit, Alexander M. Rubenchik, "Development of long-lifetime low-contamination beam dumps for NIF", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); doi: 10.1117/12.294302; https://doi.org/10.1117/12.294302
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