Tripled yield in direct-drive laser fusion through statistical modelling

Gopalaswamy, V.; Betti, R.; Knauer, J.P.; Luciani, N.; Patel, Daksha; Woo, K. M.; Bose, A.; Igumenshchev, I. V.; Campbell, E. M.; Anderson, K.S.; Bauer, K. A.; Bonino, M. J.; Cao, D.; Christopherson, A. R.; Collins, G. W.; Collins, T. J. B.; Davies, J. R.; Delettrez, J. A.; Edgell, D. H.; Epstein, R.; Forrest, C.; Froula, Dustin; Glebov, V. Yu.; Goncharov, V. N.; Harding, D. R.; Hu, Suxing; Jacobs‐Perkins, D.; Janezic, R.; Kelly, John; Mannion, O. M.; Maximov, A. V.; Marshall, F. J.; Michel, D. T.; Miller, S. C.; Morse, Samuel Finley Breese; Palastro, J. P.; Peebles, J.; Radha, P. B.; Regan, S. P.; Sampat, Siddharth; Sangster, T. C.; Sefkow, A. B.; Seka, W.; Shah, Rahul; Shmyada, W. T.; Shvydky, A.; Stoeckl, C.; Solodov, A. A.; Theobald, W.; Zuegel, J. D.; Johnson, M. Gatu; Petrasso, R. D.; Li, C. K.; Frenje, J. A.

doi:10.1038/s41586-019-0877-0

Cited by 116 publications

(53 citation statements)

References 54 publications

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“…With an asymmetry this significant observed even for these relatively low-convergence implosions, significantly larger stalk-seeded ρR asymmetries can be expected to develop when the implosion is driven to converge more. Interestingly, recent efforts to predict performance of cryogenically layered implosions on OMEGA using data-driven statistical modeling suggest the presence of a persistent, systematic but as of yet unidentified asymmetry seed in these implosions [49]; our results point to the target mount as the likely culprit.…”

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confidence: 49%

Impact of asymmetries on fuel performance in inertial confinement fusion

et al. 2018

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Low-mode asymmetries prevent effective compression, confinement and heating of the fuel in inertial confinement fusion (ICF) implosions and their control is essential to achieving ignition. Ion temperatures (T ion) in ICF experiments are inferred from the broadening of primary neutron spectra. Directional motion (flow) of the fuel at burn also impacts broadening and will lead to artificially inflated "T ion " values. Flow due to low-mode asymmetries is expected to give rise to line-of-sight variations in measured T ion. We report on intentionally asymmetrically driven experiments at the OMEGA laser facility designed to test the ability to accurately predict and measure line-of-sight differences in apparent T ion due to low-mode asymmetry-seeded flows. Contrasted to Chimera and xRAGE simulations, the measurements demonstrate how all asymmetry seeds have to be considered to fully capture the flow field in an implosion. In particular, flow induced by the stalk that holds the target is found to interfere with the seeded asymmetry. A substantial stalk-seeded asymmetry in the areal density of the implosion is also observed.

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confidence: 49%

Impact of asymmetries on fuel performance in inertial confinement fusion

et al. 2018

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“…An inertial confinement fusion (ICF) plasma (see e.g. the introductory book [1] or papers as [12,13,14,15,16,17,18,19]) is obtained by irradiating a target, either solid or enclosed in an external shell, containing fuel for the purported fusion reaction, with several laser beams. Electrons in the target surface receive the photons energy and subsequently accelerate also ions.…”

Section: Non-neutral Laser-induced Plasmas For Fusion Energy Productionmentioning

confidence: 99%

Fusion hindrance effects in laser-induced non-neutral plasmas

Perrotta

Bonasera

2019

Nuclear Physics A

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Inertial confinement fusion hotspots and cluster Coulomb explosion plasmas may develop a positive net electric charge. The Coulomb barrier penetrability and the rate of nuclear fusion reactions at ultra-low energies ( 10 keV) are altered by such an environment. These effects are here studied via the screening potential approach. Approximate analytical results are developed by evaluating the average screening potential for some scenarios of interest. It is found that fusion is hindered for reactions between thermal fuel nuclei, while an enhancement is expected for secondary and "beam-target" reactions. Depending on the plasma conditions, the variations can be relevant even for relatively small net charges (several % difference or more in the fusion rate for an average net charge per nucleus of 10 −5 proton charges).

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“…In inertial confinement fusion (ICF) experiments, the fusion plasma is generated when high-power drivers, such as lasers, are used to implode fusion fuel. On page 581, Gopalaswamy et al 1 report the use of experimentally trained statistical models to triple the fusion yield and substantially improve the plasma confinement in ICF experiments.…”

Section: A R K C H E R R M a N Nmentioning

confidence: 99%

“…Much of what we know about the molecular machinerythe spliceosome and its associated factorsand the mechanisms of splicing has come from genetic and biochemical experiments using baker's yeast (Saccharomyces cerevisiae). Laboratory studies have suggested that most yeast introns can be removed with little consequence for the cell 1 . Parenteau et al 2…”

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confidence: 99%

“…Inertial confinement fusion. Gopalaswamy et al1 present a method for increasing the energy output from experiments at the OMEGA Laser Facility 2 that involve a process called inertial confinement fusion. a, In these experiments, laser beams rapidly heat the surface of a millimetre-sized fuel capsule, producing an envelope of highly ionized gas known as a plasma.…”

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