期刊
PHYSICS OF PLASMAS
卷 19, 期 5, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4718594
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资金
- U.S. DOE Office of Inertial Confinement Fusion [DE-FC52-08NA28302]
- University of Rochester
- New York State Energy Research and Development Authority
Direct-drive-implosion experiments on the OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] have showed discrepancies between simulations of the scattered (non-absorbed) light levels and measured ones that indicate the presence of a mechanism that reduces laser coupling efficiency by 10%-20%. This appears to be due to crossed-beam energy transfer (CBET) that involves electromagnetic-seeded, low-gain stimulated Brillouin scattering. CBET scatters energy from the central portion of the incoming light beam to outgoing light, reducing the laser absorption and hydrodynamic efficiency of implosions. One-dimensional hydrodynamic simulations including CBET show good agreement with all observables in implosion experiments on OMEGA. Three strategies to mitigate CBET and improve laser coupling are considered: the use of narrow beams, multicolor lasers, and higher-Z ablators. Experiments on OMEGA using narrow beams have demonstrated improvements in implosion performance. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4718594]
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