Cryogenic tritium-hydrogen-deuterium and deuterium-tritium layer implosions with high density carbon ablators in near-vacuum hohlraums

Meezan, N. B.; Hopkins, L. F. Berzak; Pape, S. Le; Divol, L.; Mackinnon, A. J.; Döppner, T.; Ho, D.; Jones, O. S.; Khan, S. F.; Ma, T.; Milovich, J. L.; Pak, A.; Ross, J. S.; Thomas, C. A.; Benedetti, L. R.; Bradley, D. K.; Celliers, P. M.; Clark, Daniel; Field, J. E.; Haan, S. W.; Izumi, N.; Kyrala, G. A.; Moody, J. D.; Patel, P. K.; Ralph, J. E.; Rygg, J. R.; Sepke, S. M.; Spears, B. K.; Tommasini, R.; Town, R. P. J.; Biener, Juergen; Bionta, R. M.; Bond, E.; Caggiano, J. A.; Eckart, M. J.; Johnson, M. Gatu; Grim, G.; Hamza, A. V.; Hartouni, E. P.; Hatarik, R.; Hoover, D.; Kilkenny, J. D.; Kozioziemski, B.; Kroll, J. J.; McNaney, J. M.; Nikroo, A.; Sayre, D. B.; Stadermann, Michael; Wild, C.; Yoxall, B.; Landen, O. L.; Hsing, W. W.; Edwards, M.

doi:10.1063/1.4921947

Cited by 63 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10,11 An alternative approach to minimize the impact of wall motion is to shorten the laser pulses using high density carbon (HDC) ablators in conjunction with a 2-, 3-, or 4-shock laser drive. [12][13][14][15] The denser HDC (3.5 g/cm 3 compared to the 1 g/cm 3 of CH) means an equivalent ablator mass is contained in a much thinner shell through which the first shock propagates more quickly, shortening the overall length of a shock-timed laser pulse. This allows for high-performing 3shock designs that are only 6 À 7 ns in duration, which in turn enables the removal of most of the helium fill gas (down to 0.032 mg/cm 3 in the "near-vacuum" hohlraum, or NVH), reducing the drive deficits and the uncertainties associated with laser-plasma instabilities.…”

Section: Introductionmentioning

confidence: 99%

Symmetry control in subscale near-vacuum hohlraums

et al. 2016

Self Cite

View full text Add to dashboard Cite

Controlling the symmetry of indirect-drive inertial confinement fusion implosions remains a key challenge. Increasing the ratio of the hohlraum diameter to the capsule diameter (case-to-capsule ratio, or CCR) facilitates symmetry tuning. By varying the balance of energy between the inner and outer cones as well as the incident laser pulse length, we demonstrate the ability to tune from oblate, through round, to prolate at a CCR of 3.2 in near-vacuum hohlraums at the National Ignition Facility, developing empirical playbooks along the way for cone fraction sensitivity of various laser pulse epochs. Radiation-hydrodynamic simulations with enhanced inner beam propagation reproduce most experimental observables, including hot spot shape, for a majority of implosions. Specular reflections are used to diagnose the limits of inner beam propagation as a function of pulse length.

show abstract

Section: Introductionmentioning

confidence: 99%

Symmetry control in subscale near-vacuum hohlraums

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Unfortunately, adiabat-shaped cryogenic implosions have not yet been explored further. All the recent designs explored on the NIF, being either with different capsule materials [59][60][61] or exotic forms of hohlraums [62], are rather based on low convergence implosions. An unexpected cliff in target performances seems to appear for fuel adiabat around α 2.3, with mixing at play.…”

Section: (B) Indirect-drive Physicsmentioning

confidence: 99%

Recent progress in quantifying hydrodynamics instabilities and turbulence in inertial confinement fusion and high-energy-density experiments

Casner

2020

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Since the seminal paper of Nuckolls triggering the quest of inertial confinement fusion (ICF) with lasers, hydrodynamic instabilities have been recognized as one of the principal hurdles towards ignition. This remains true nowadays for both main approaches (indirect drive and direct drive), despite the advent of MJ scale lasers with tremendous technological capabilities. From a fundamental science perspective, these gigantic laser facilities enable also the possibility to create dense plasma flows evolving towards turbulence, being magnetized or not. We review the state of the art of nonlinear hydrodynamics and turbulent experiments, simulations and theory in ICF and high-energy-density plasmas and draw perspectives towards in-depth understanding and control of these fascinating phenomena. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.

show abstract

“…Only in the last few years has a targeted manufacturing process been developed for lining the interior of a NIF ICF target with an ultra-low density CH foam that is uniform and robust enough to survive wetting by liquid hydrogen [9,10]. The liquid D 2 and liquid DT wetted foam layer experiments were made possible by this new target manufacturing innovation, as well as the availability of the NIF high-density carbon capsule and near-vacuum hohlraum platform [11,12]. However, preparing a foam liner on the inner surface of the capsule is quite time consuming and costly.…”

Section: Introductionmentioning

confidence: 99%

Study on the growth and redistribution of deuterium–deuterium layer driven by temperature gradient

Tao¹,

Wu²,

Dai³

et al. 2022

Nucl. Fusion

View full text Add to dashboard Cite

We report results of crystal growth, layering of the deuterium-deuterium (D2) layers in cylindrical cryogenic targets. For the first time, we realized the global coverage of the D2 layer on the inner surface of the capsule through the crystal growth of D2 ice, and the control of the temperature field without the infrared radiation, foam lining, and magnetic field. Analysis of the image of X-ray phase contrast imaging shows that the thickness of the D2 layer is about 36.53 μm, and the inner surface roughness is 3.23 μm. The finite element method is applied to simulate the temperature field of the target, and the phase transition process of D2, revealing the mechanism of D2 covering the inner surface of the capsule. These initial experiments provide a new vision and method for exploring and achieving the pure crystal growth as well as layering of D2 without operation of radioactive tritium.

show abstract

Cryogenic tritium-hydrogen-deuterium and deuterium-tritium layer implosions with high density carbon ablators in near-vacuum hohlraums

Cited by 63 publications

References 31 publications

Symmetry control in subscale near-vacuum hohlraums

Symmetry control in subscale near-vacuum hohlraums

Recent progress in quantifying hydrodynamics instabilities and turbulence in inertial confinement fusion and high-energy-density experiments

Study on the growth and redistribution of deuterium–deuterium layer driven by temperature gradient

Contact Info

Product

Resources

About