Monoenergetic-Proton-Radiography Measurements of Implosion Dynamics in Direct-Drive Inertial-Confinement Fusion

Li, C. K.; Séguin, F. H.; Rygg, J. R.; Frenje, J. A.; Manuel, M. J.-E.; Petrasso, R. D.; Betti, R.; Delettrez, J. A.; Knauer, J. P.; Marshall, F. J.; Meyerhofer, D. D.; Shvarts, D.; Smalyuk, V. A.; Stoeckl, C.; Landen, O. L.; Town, R. P. J.; Back, C. A.; Kilkenny, J. D.

doi:10.1103/physrevlett.100.225001

Cited by 92 publications

(54 citation statements)

References 20 publications

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“…[22][23][24][25] These techniques have proven useful in laser-driven capsule implosions and planar and spherical instability experiments. Unfortunately, the large azimuthal drive field used to implode the liner precludes such measurements in pulsed power-driven experiments.…”

Section: The Modelsmentioning

confidence: 99%

Effects of magnetization on fusion product trapping and secondary neutron spectra

et al. 2015

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By magnetizing the fusion fuel in inertial confinement fusion (ICF) systems, the required stagnation pressure and density can be relaxed dramatically. This happens because the magnetic field insulates the hot fuel from the cold pusher and traps the charged fusion burn products. This trapping allows the burn products to deposit their energy in the fuel, facilitating plasma self-heating. Here, we report on a comprehensive theory of this trapping in a cylindrical DD plasma magnetized with a purely axial magnetic field. Using this theory, we are able to show that the secondary fusion reactions can be used to infer the magnetic field-radius product, BR, during fusion burn. This parameter, not qR, is the primary confinement parameter in magnetized ICF. Using this method, we analyze data from recent Magnetized Liner Inertial Fusion experiments conducted on the Z machine at Sandia National Laboratories. We show that in these experiments BR % 0.34(þ0.14/À0.06) MG Á cm, a $ 14Â increase in BR from the initial value, and confirming that the DD-fusion tritons are magnetized at stagnation. This is the first experimental verification of charged burn product magnetization facilitated by compression of an initial seed magnetic flux. V C 2015 AIP Publishing LLC. [http://dx.

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Section: The Modelsmentioning

confidence: 99%

Effects of magnetization on fusion product trapping and secondary neutron spectra

et al. 2015

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“…2,3 The presence of multiple peaks in the electric field structure is also a signature of the presence of multiple shocks.…”

Section: Icf-relevant Simulationsmentioning

confidence: 99%

Species separation in inertial confinement fusion fuels

et al. 2013

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It is shown by means of multi-fluid particle-in-cell simulations that convergence of the spherical shock wave that propagates through the inner gas of inertial confinement fusion-relevant experiments is accompanied by a separation of deuterium (D) and tritium (T) ions across the shock front. Deuterons run ahead of the tritons due to their lower mass and higher charge-to-mass ratio and can reach the center several tens of picoseconds before the tritons. The rising edge of the DD and TT fusion rate is also temporally separated by the same amount, which should be an observable in experiments and would be a direct proof of the “stratification conjecture” on the shock front [Amendt et al., Phys. Plasmas 18, 056308 (2011)]. Moreover, dephasing of the D and T shock components in terms of density and temperature leads to a degradation of the DT fusion yield as the converging shock first rebounds from the fuel center (shock yield). For the parameters of this study, the second peak in the fusion yield (compression yield) is strongly dependent on the choice of the flux limiter.

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“…These include an external, radial E field due to net charging of laserilluminated capsules to potentials of order 0.5 MV (indicated by an upshift in the energy of charged fusion products as they leave the capsule 11,12 ), and also external, nonradial E or B fields 13 that generated angular variations in the fluence of charged fusion products by changing their trajectories without changing their energies. Recent experiments utilizing monoenergetic-proton radiography 14 provided evidence of radial fields inside direct-drive capsules 15 and filamentary structure in the corona of a fast-ignition type, cone-in-shell target. 16 Ref.…”

Section: Introductionmentioning

confidence: 99%

Time evolution of filamentation and self-generated fields in the coronae of directly driven inertial-confinement fusion capsules

Séguin¹,

Li²,

Manuel³

et al. 2012

Physics of Plasmas

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Time-gated radiography with monoenergetic 15-MeV protons, 3-MeV protons, and 4-MeV alpha particles has revealed a rich and complex evolution of electromagnetic field structures in and around imploding, directly driven inertial-confinement fusion (ICF) targets at the OMEGA laser facility. Plastic-shell capsules and solid plastic spheres were imaged during and after irradiation with ICF-relevant laser drive (up to 6 Â 10 14 W=cm 2 ). Radial filaments appeared while the laser was on; they filled, and were frozen into, the out-flowing corona, persisting until well after the end of the laser drive. Data from specially designed experiments indicate that the filaments were not generated by two-plasmon-decay instabilities or by Rayleigh-Taylor instabilities associated with shell acceleration. Before the onset of visible filamentation, quasi-spherical field structures appeared outside the capsule in the images in a form that suggests outgoing shells of net positive charge. We conjecture that these discrete shells are related to multiple peaks seen previously in the spectra of protons ablated from the targets.

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Monoenergetic-Proton-Radiography Measurements of Implosion Dynamics in Direct-Drive Inertial-Confinement Fusion

Cited by 92 publications

References 20 publications

Effects of magnetization on fusion product trapping and secondary neutron spectra

Effects of magnetization on fusion product trapping and secondary neutron spectra

Species separation in inertial confinement fusion fuels

Time evolution of filamentation and self-generated fields in the coronae of directly driven inertial-confinement fusion capsules

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