Initial cone-in-shell fast-ignition experiments on OMEGA

Theobald, W.; Solodov, A. A.; Stoeckl, C.; Anderson, K.S.; Betti, R.; Boehly, T. R.; Craxton, R. S.; Delettrez, J. A.; Dorrer, C.; Frenje, J. A.; Glebov, V. Yu.; Habara, H.; Tanaka, K. A.; Knauer, J. P.; Lauck, R.; Marshall, F. J.; Marshall, K. L.; Meyerhofer, D. D.; Nilson, P.M.; Patel, P. K.; Chen, H.; Sangster, T. C.; Seka, W.; Sinenian, N.; Ma, T.; Beg, F. N.; Giraldez, E.; Stephens, R. B.

doi:10.1063/1.3566082

Cited by 84 publications

(72 citation statements)

References 56 publications

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“…Slight shot-to-shot differences in the Al-tip deformation do not affect the overall performance of the implosion. The present target is more resilient against the strong shock from the implosion than a previous design with a gold-only cone 12 . Those experiments measured the breakout time for various gold-cone tips with thicknesses from 5 to 15 mm and demonstrated a later breakout for thicker tips.…”

Section: Discussionmentioning

confidence: 87%

“…A small aluminium cylindrical tip was mounted on the end of the cone. The purpose of the 60-mm thick Al tip was to delay the shock breakout compared with a previous design with a 15-mm Au tip 12 . There is a trade-off between possessing sufficient tip material to delay the breakout and a good electron coupling into the core because more material might affect the electron transport and increases the standoff distance from source to core.…”

Section: Resultsmentioning

confidence: 99%

“…The simulation capability was significantly improved compared with the results reported in ref. 12. The radiation transport has been included, the Eulerian scheme improved, and nonlocal thermal electron transport 27 and cross-beam energy transfer 28 accounted for.…”

Section: Resultsmentioning

confidence: 99%

“…The coupling efficiency of the electron energy into the dense core depends on a number of parameters, including the standoff distance between the location where the fast electrons are produced and the dense plasma, the divergence and energy distribution of the electrons, the transport dynamics through a potential pre-plasma inside the cone 12 and through the cone wall, and the areal density of the compressed plasma. There is an ongoing effort to quantify this coupling efficiency in OMEGA experiments by characterizing the spatial distribution of fast-electron energy in the compressed core using Cu-doped plastic shells and imaging the fast-electronexcited Cu K a fluorescence emission 33,34 .…”

Section: Discussionmentioning

confidence: 99%

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Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

et al. 2014

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The advent of high-intensity lasers enables us to recreate and study the behaviour of matter under the extreme densities and pressures that exist in many astrophysical objects. It may also enable us to develop a power source based on laser-driven nuclear fusion. Achieving such conditions usually requires a target that is highly uniform and spherically symmetric. Here we show that it is possible to generate high densities in a so-called fast-ignition target that consists of a thin shell whose spherical symmetry is interrupted by the inclusion of a metal cone. Using picosecond-time-resolved X-ray radiography, we show that we can achieve areal densities in excess of 300 mg cm À 2 with a nanosecond-duration compression pulsethe highest areal density ever reported for a cone-in-shell target. Such densities are high enough to stop MeV electrons, which is necessary for igniting the fuel with a subsequent picosecond pulse focused into the resulting plasma.

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Section: Discussionmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

et al. 2014

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“…Up to 20% coupling from a 0.6 ps ignition laser was demonstrated experimentally in 2001 [2] with a coneinserted target to reduce the transport distance of the electrons to the core. However, a few subsequent experiments with longer duration ignition lasers between 2008 and 2011 reported much lower coupling at Vulcan [3], Omega EP [4], and GEKKO XII systems [5], respectively. The large difference in the coupling was not completely understood, but could be related to different preplasmas formed by the ignition laser prepulses in the cones [3][4][5].…”

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confidence: 99%

Magnetically Assisted Fast Ignition

et al. 2015

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Fast ignition (FI) is investigated via integrated particle-in-cell simulation including both generation and transport of fast electrons, where petawatt ignition lasers of 2 ps and compressed targets of a peak density of 300 g cm −3 and areal density of 0.49 g cm −2 at the core are taken. When a 20 MG static magnetic field is imposed across a conventional cone-free target, the energy coupling from the laser to the core is enhanced by sevenfold and reaches 14%. This value even exceeds that obtained using a cone-inserted target, suggesting that the magnetically assisted scheme may be a viable alternative for FI. With this scheme, it is demonstrated that two counterpropagating, 6 ps, 6 kJ lasers along the magnetic field transfer 12% of their energy to the core, which is then heated to 3 keV.

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Effect of inactive impurity ions on deuteron beam‐fusion in fast ignition approach

Khanbabaei

Nazirzadeh

2022

Contributions to Plasma Physics

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The laser‐generated deuteron beam is a promising scheme for providing the required energy for igniting a pre‐compressed fuel in the fast ignition method in the inertial confinement fusion approach. Deuteron beam provides extra energy through beam‐fusion(BF) reactions during the hot‐spot formation in the pre‐compressed fuel. During the compression and hot‐spot formation stages, Impurities are produced due to the mixing of the fuel with the material of the structural elements of the target. So, the efficiency of BF of the deuteron beam in a spherical deuteron‐triton(DT) fuel in the presence of impurity (such as beryllium, carbon, aluminium, and gold) with arbitrary concentration is investigated. Deuteron beam was considered with Maxwellian energy distribution at a temperature of 3 MeV, which passes through the pre‐compressed contaminated DT fuel with a non‐uniform density profile. It shows that an increase of mixed‐ion charge state and density ratio results in the substantial diminution of the deuteron BF probability, which leads to a reduction in deuteron's extra bonus energy. The effect of fuel temperature on the BF probability in contaminated DT fuel is discussed. Calculations show that increasing the temperature enhanced BF probability.

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Initial cone-in-shell fast-ignition experiments on OMEGA

Cited by 84 publications

References 56 publications

Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion

Magnetically Assisted Fast Ignition

Effect of inactive impurity ions on deuteron beam‐fusion in fast ignition approach

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