Crossed-beam energy transfer in implosion experiments on OMEGA

Igumenshchev, I. V.; Edgell, D. H.; Goncharov, V. N.; Delettrez, J. A.; Maximov, A. V.; Myatt, J. F.; Seka, W.; Shvydky, A.; Skupsky, S.; Stoeckl, C.
December 2010
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122708
Academic Journal
Radiative hydrodynamic simulations of implosion experiments on the OMEGA laser system [Boehly et al., Opt. Commun. 133, 495 (1997)] show that energy transfer between crossing laser beams can reduce laser absorption by 10%-20%. A new quantitative model for the crossed-beam energy transfer has been developed, allowing one to simulate the coupling of multiple beams in the expanding corona of implosion targets. Scattered-light and bang-time measurements show good agreement with predictions of this model when nonlocal heat transport is employed. The laser absorption can be increased by narrowing laser beams and/or employing two-color light, which both reduce the crossed-beam energy transfer.


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