In-tank, on-shot characterization of the OMEGA laser system focal spot

L. J. Waxer; K. A. Bauer; E. C. Cost; M. Heimbueger; J. H. Kelly; V. Kobilansky; S. F. B. Morse; D. Nelson; R. Peck; R. Rinefierd; S. Sampat; M. J. Shoup III; D. Weiner; G. Weselak; J. Zou

doi:10.1117/12.2506792

4 March 2019 In-tank, on-shot characterization of the OMEGA laser system focal spot

L. J. Waxer, K. A. Bauer, E. C. Cost, M. Heimbueger, J. H. Kelly, V. Kobilansky, S. F. B. Morse, D. Nelson, R. Peck, R. Rinefierd, S. Sampat, M. J. Shoup III, D. Weiner, G. Weselak, J. Zou

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Proceedings Volume 10898, High Power Lasers for Fusion Research V; 108980F (2019) https://doi.org/10.1117/12.2506792
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Direct-drive fusion implosion experiments using the 60-beam OMEGA Laser System require ~1% rms uniformity on target. Measurements from laser diagnostics indicate that beam-to-beam power variation has been sufficiently reduced such that the uniformity nearly meets this requirement; however, experimental results suggest otherwise. To better understand this discrepancy, a full-beam-in-tank diagnostic has been developed to characterize the on-shot, full-energy focal spot of a single beam inside the target chamber using a small sample of the beam from the final optic assembly. In this paper, we describe the diagnostic and present the results of commissioning experiments.

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L. J. Waxer, K. A. Bauer, E. C. Cost, M. Heimbueger, J. H. Kelly, V. Kobilansky, S. F. B. Morse, D. Nelson, R. Peck, R. Rinefierd, S. Sampat, M. J. Shoup III, D. Weiner, G. Weselak, and J. Zou "In-tank, on-shot characterization of the OMEGA laser system focal spot", Proc. SPIE 10898, High Power Lasers for Fusion Research V, 108980F (4 March 2019); https://doi.org/10.1117/12.2506792

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