Enhanced Direct-Drive Implosions with Thin High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Ablation Layers

Mostovych, A. N.; Colombant, D.; Karasik, M.; Knauer, J. P.; Schmitt, A. J.; Weaver, James L.

doi:10.1103/physrevlett.100.075002

Cited by 25 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radiation from the higher-Z dopant preheats the shell, reducing both the initial imprint levels 28,29 and the Rayleigh-Taylor instability growth. The radiation from the higher-Z dopant preheats the shell, reducing both the initial imprint levels 28,29 and the Rayleigh-Taylor instability growth.…”

Section: Suprathermal-electron Preheat and R Samplingmentioning

confidence: 99%

Performance of direct-drive cryogenic targets on OMEGA

et al. 2008

View full text Add to dashboard Cite

The success of direct-drive-ignition target designs depends on two issues: the ability to maintain the main fuel adiabat at a low level and the control of the nonuniformity growth during the implosion. A series of experiments was performed on the OMEGA Laser System ͓T. R. Boehly, D. L. Brown, R. S. Craxton et al., Opt. Commun. 133, 495 ͑1997͔͒ to study the physics of low-adiabat, high-compression cryogenic fuel assembly. Modeling these experiments requires an accurate account for all sources of shell heating, including shock heating and suprathermal electron preheat. To increase calculation accuracy, a nonlocal heat-transport model was implemented in the 1D hydrocode. High-areal-density cryogenic fuel assembly with R Ͼ 200 mg/ cm 2 ͓T. C. Sangster, V. N. Goncharov, P. B. Radha et al., "High-areal-density fuel assembly in direct-drive cryogenic implosions," Phys. Rev. Lett. ͑submitted͔͒ has been achieved on OMEGA in designs where the shock timing was optimized using the nonlocal treatment of the heat conduction and the suprathermal-electron preheat generated by the two-plasmon-decay instability was mitigated.

show abstract

Section: Suprathermal-electron Preheat and R Samplingmentioning

confidence: 99%

Performance of direct-drive cryogenic targets on OMEGA

et al. 2008

View full text Add to dashboard Cite

show abstract

“…It is important to understand if the differences are caused by errors in the 1-D modeling since they influence models used to predict ignition. If imprint was the cause, it is expected to be of less concern as improved beam smoothing 30 and target designs with doped-CH overcoat 31 or Au layers 32 have been shown to mitigate this effect. Each of these factors is first discussed below.…”

Section: Resultsmentioning

confidence: 99%

Direct drive: Simulations and results from the National Ignition Facility

et al. 2016

View full text Add to dashboard Cite

Direct-drive implosion physics is being investigated at the National Ignition Facility. The primary goal of the experiments is twofold: to validate modeling related to implosion velocity and to estimate the magnitude of hot-electron preheat. Implosion experiments indicate that the energetics is well-modeled when cross-beam energy transfer (CBET) is included in the simulation and an overall multiplier to the CBET gain factor is employed; time-resolved scattered light and scattered-light spectra display the correct trends. Trajectories from backlit images are well modeled, although those from measured self-emission images indicate increased shell thickness and reduced shell density relative to simulations. Sensitivity analyses indicate that the most likely cause for the density reduction is nonuniformity growth seeded by laser imprint and not laser-energy coupling. Hot-electron preheat is at tolerable levels in the ongoing experiments, although it is expected to increase after the mitigation of CBET. Future work will include continued model validation, imprint measurements, and mitigation of CBET and hot-electron preheat. Published by AIP Publishing. [http://dx.

show abstract

“…This reduction occurs due to the smoothing of the plasma pressure gradients and imprint reduction due to the increased distance between the critical and ablation surfaces. The concept is similar to the thin high-Z outer layers proposed by the Naval Research laboratory for imprint reduction [68,69].…”

Section: B Symmetric Cryogenic Target Implosions On Omegamentioning

confidence: 93%

National Ignition Campaign Program Completion Report

Baisden¹

2013

View full text Add to dashboard Cite

Enhanced Direct-Drive Implosions with Thin High-ZAblation Layers

Cited by 25 publications

References 21 publications

Performance of direct-drive cryogenic targets on OMEGA

Performance of direct-drive cryogenic targets on OMEGA

Direct drive: Simulations and results from the National Ignition Facility

National Ignition Campaign Program Completion Report

Contact Info

Product

Resources

About