Crossed-beam energy transfer in direct-drive implosions

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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 ... continued below

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056314

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Seka, W; Edgell, D H; Michel, D T; Froula, D H; Goncharov, V N; Craxton, R S et al. May 22, 2012.

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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.

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056314

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  • Journal Name: PHYSICS OF PLASMAS; Journal Volume: 19

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  • Report No.: DOE/NA/28302-1063
  • Grant Number: FC52-08NA28302
  • Office of Scientific & Technical Information Report Number: 1043686
  • Archival Resource Key: ark:/67531/metadc829424

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 22, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 5, 2016, 1:23 p.m.

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Seka, W; Edgell, D H; Michel, D T; Froula, D H; Goncharov, V N; Craxton, R S et al. Crossed-beam energy transfer in direct-drive implosions, article, May 22, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc829424/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.