Characterization of the OMEGA laser system on-shot, focal-spot uniformity and wavefront

Leon J. Waxer; Siddharth Sampat; Matthew Heimbueger; Katelynn Bauer; Seung-Whan Bahk; David Weiner; Alexander Shvydky; Joseph Kwiatkowski

doi:10.1117/12.2646864

17 March 2023 Characterization of the OMEGA laser system on-shot, focal-spot uniformity and wavefront

Leon J. Waxer, Siddharth Sampat, Matthew Heimbueger, Katelynn Bauer, Seung-Whan Bahk, David Weiner, Alexander Shvydky, Joseph Kwiatkowski

Author Affiliations +

Proceedings Volume PC12401, High Power Lasers for Fusion Research VII; PC1240106 (2023) https://doi.org/10.1117/12.2646864
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Direct-drive fusion implosion experiments using the 60-beam OMEGA Laser System require ~1% rms uniformity on target. To fully characterize on-target uniformity, a full-beam in-tank diagnostic that measures the on-shot, full-energy focal spot of 28 of the 60 beams inside the target chamber was deployed in 2018. While this diagnostic demonstrated the absence of gross nonuniformities, questions about lower-level variations and their effects on overall uniformity remained. We will present improvements in dynamic range, a new wavefront measurement capability, a summary of the 28 beams characterized to date, and a discussion of observed differences between beams under varying shot conditions.

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Leon J. Waxer, Siddharth Sampat, Matthew Heimbueger, Katelynn Bauer, Seung-Whan Bahk, David Weiner, Alexander Shvydky, and Joseph Kwiatkowski "Characterization of the OMEGA laser system on-shot, focal-spot uniformity and wavefront", Proc. SPIE PC12401, High Power Lasers for Fusion Research VII, PC1240106 (17 March 2023); https://doi.org/10.1117/12.2646864

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