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250 results on '"Sio, H."'

1. Design and Modeling of Indirectly-Driven Magnetized Implosions on the NIF

Author

Strozzi, D. J., Sio, H., Zimmerman, G. B., Moody, J. D., Weber, C. R., Djordjevic, B. Z., Walsh, C. A., Hammel, B. A., Pollock, B. B., and Povilus, A.

Subjects
Physics - Plasma Physics
Abstract

The use of magnetic fields to improve the performance of hohlraum-driven implosions on the National Ignition Facility (NIF) is discussed. The focus is on magnetically insulated inertial confinement fusion (ICF), where the primary field effect is to reduce electron-thermal and alpha-particle loss from the compressed hotspot (magnetic pressure is of secondary importance). We summarize the requirements to achieve this state. The design of recent NIF magnetized hohlraum experiments is presented. These are close to earlier shots in the three-shock, high-adiabat (BigFoot) campaign, subject to the constraints that magnetized NIF targets must be fielded at room-temperature, and use < 1 MJ of laser energy to avoid risk of optics damage from stimulated Brillouin scattering. We present results from the original magnetized hohlraum platform, as well as a later variant which gives higher hotspot temperature. In both platforms, imposed fields (at the capsule center) of up to 28 T increase the fusion yield and hotspot temperature. Integrated radiation-magneto-hydrodynamic (rad-MHD) modeling with the Lasnex code of these shots is shown, where laser power multipliers and a saturation clamp on cross-beam energy transfer (CBET) are developed to match the time of peak capsule emission and the P2 Legendre moment of the hotspot x-ray image. The resulting fusion yield and ion temperature agree decently with the measured relative effects of the field, although the absolute simulated yields are higher than the data by 2.0-2.7X. The tuned parameters and yield discrepancy are comparable for experiments with and without an imposed field, indicating the model adequately captures the field effects. Self-generated and imposed fields are added sequentially to simulations of one BigFoot NIF shot to understand how they alter target dynamics., Comment: 15 pages, 9 figures

Published
2024

2. Resistive Diffusion in Magnetized ICF Implosions: Reduced Magnetic Stabilization of the Richtmyer Meshkov Instability

Author

Walsh, C. A., Strozzi, D. J., Sio, H., Pollock, B. B., Appelbe, B. D., Crilly, A. J., O'Neill, S., Weber, C., Chittenden, J. P., and Moody, J. D.

Subjects
Physics - Plasma Physics
Abstract

Resistive diffusion is typically regarded to be negligible in magnetized ICF experiments, with magnetic flux effectively compressed during the implosion. In this work the Richtmyer Meshkov instability at the ice-ablator interface is taken as an example for investigating resistive effects. For a high temperature (approximately 100eV) interface with magnetic field applied perpendicular to shock propagation, perturbation growth is suppressed by magnetic tension. However, for lower temperature interfaces the resistive diffusion prevents substantial magnetic field twisting at small scales. ICF implosion simulations are then used to assess magnetic diffusivity at different interfaces; the ice-ablator interface is found to be too resistive for the magnetic fields to enhance stability. For Rayleigh-Taylor growth at the hot-spot edge, on the other hand, resistivity is estimated to only be a secondary effect, as seen in previous simulation studies.

Published
2023

3. Magnetized ICF Implosions: Scaling of Temperature and Yield Enhancement

Author

Walsh, C. A., O'Neill, S., Chittenden, J. P., Crilly, A. J., Appelbe, B., Strozzi, D. J., Ho, D., Sio, H., Pollock, B., Divol, L., Hartouni, E., Rosen, M., Logan, B. G., and Moody, J. D.

Subjects
Physics - Plasma Physics
Abstract

This paper investigates the impact of an applied magnetic field on the yield and hot-spot temperature of inertial confinement fusion implosions. A scaling of temperature amplification due to magnetization is shown to be in agreement with unperturbed 2-D extended-magnetohydrodynamic simulations. A perfectly spherical hot-spot with an axial magnetic field is predicted to have a maximum temperature amplification of 37%. However, elongation of the hot-spot along field lines raises this value by decreasing the hot-spot surface area along magnetic field lines. A scaling for yield amplification predicts that a magnetic field has the greatest benefit for low temperature implosions; this is in agreement with simplified 1-D simulations, but not 2-D simulations where the hot-spot pressure can be significantly reduced by heat-flow anisotropy. Simulations including a P2 drive asymmetry then show that the magnetized yield is a maximum when the capsule drive corrects the hot-spot shape to be round at neutron bang-time. The benefit of an applied field increases when the implosion is more highly perturbed. Increasing the magnetic field strength past the value required to magnetize the electrons is beneficial due to additional suppression of perturbations by magnetic tension.

Published
2021
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5. Numerical Simulation of magnetized jet creation using a hollow ring of laser beams

Author

Lu, Y., Tzeferacos, P., Liang, E., Follett, R. K., Gao, L., Birkel, A., Froula, D. H., Fu, W., Ji, H., Lamb, D., Li, C. K., Sio, H., Petrasso, R., and Wei, M.

Subjects
Physics - Plasma Physics
Abstract

Three dimensional FLASH magneto-hydrodynamics(MHD) modeling is carried out to interpret the OMEGA laser experiments of strongly magnetized, highly collimated jets driven by a ring of 20 OMEGA beams. The predicted optical Thomson scattering spectra and proton images are in good agreement with a subset of the experimental data. Magnetic fields generated via the Biermann battery term are amplified at the boundary between the core and the surrounding of the jet. The simulation predicts multiple axially aligned magnetic flux ropes with alternating poloidal component. Future applications of the hollow ring configuration in laboratory astrophysics are discussed.

Published
2018
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6. Inference of the electron temperature in ICF implosions from the hard X-ray spectral continuum

Author

Kagan, Grigory, Landen, O. L., Svyatskiy, D., Sio, H., Kabadi, N. V., Simpson, R. A., Johnson, M. Gatu, Frenje, J. A., Petrasso, R. D., Shah, R. C., Joshi, T. R., Hakel, P., Weber, T. E., Rinderknecht, H. G., Thorn, D., Schneider, M., Bradley, D., and Kilkenny, J.

Subjects
Physics - Plasma Physics
Abstract

Using the free-free continuum self-emission spectrum at photon energies above 15 keV is one of the most promising concepts for assessing the electron temperature in ICF experiments. However, these photons are due to suprathermal electrons whose mean-free-path is much larger than thermal, making their distribution deviate from Maxwellian in a finite-size hot-spot. The first study of the free-free X-ray emission from an ICF implosion is conducted with the kinetic modifications to the electron distribution accounted for. These modifications are found to result in qualitatively new features in the hard X-ray spectral continuum. Inference of the electron temperature as if the emitting electrons are Maxwellian is shown to give a lower value than the actual one., Comment: Revised version accepted for publication

Published
2017

7. Measurements of K-edge and L-edge extended x-ray absorption fine structure at the national ignition facility (invited).

Author

Sio, H., Krygier, A., Stoupin, S., Rudd, R. E., Bonev, S. A., Braun, D. G., Coppari, F., Coleman, A. L., Bhandarkar, N., Bitter, M., Bradley, D. K., Buscho, J., Corbin, J., Dozieres, M., Efthimion, P. C., Eggert, J. H., Gao, L., Hill, K. W., Hamel, S., and Hsing, W.

Subjects
*EXTENDED X-ray absorption fine structure, *X-ray absorption, *GEOPHYSICS, *PLANETARY science, *COPPER
Abstract

High-energy-density laser facilities and advances in dynamic compression techniques have expanded access to material states in the Terapascal regime relevant to inertial confinement fusion, planetary science, and geophysics. However, experimentally determining the material temperature in these extreme conditions has remained a difficult challenge. Extended X-ray Absorption Fine Structure (EXAFS), referring to the modulations in x-ray absorption above an absorption edge from photoelectrons' interactions with neighboring atoms, has proven to be a versatile and robust technique for probing material temperature and density for mid-to-high Z elements under dynamic compression. The current platform at the National Ignition Facility has developed six configurations for EXAFS measurements between 7 and 18 keV for different absorption edges (Fe K, Co K, Cu K, Ta L3, Pb L3, and Zr K) using a curved-crystal spectrometer and a bright, continuum foil x-ray source. In this work, we describe the platform geometry, x-ray source performance, spectrometer resolution and throughput, design considerations, and data in ambient and dynamic-compression conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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8. High-yield implosion modeling using the Frustraum: Assessing and controlling the formation of polar jets and enhancing implosion performance with applied magnetization.

Author

Ho, D. D.-M., Amendt, P. A., Baker, K. L., Landen, O. L., Lindl, J. D., Marinak, M. M., Sio, H., Velikovich, A. L., Zimmerman, G. B., Kritcher, A. L., Dewald, E. L., Mariscal, D. A., Salmonson, J. D., and Weber, C. R.

Subjects
IMPLOSIONS, ION temperature, GOVERNMENT laboratories, URANIUM, RADIATION, INERTIAL confinement fusion
Abstract

Frustraums have a higher laser-to-capsule x-ray radiation coupling efficiency and can accommodate a large capsule, thus potentially generating a higher yield with less laser energy than cylindrical Hohlraums for a given Hohlraum volume [Amendt et al., Phys. Plasmas 26, 082707 (2019]. Frustraums are expected to have less m = 4 azimuthal asymmetries arising from the intrinsic inner-laser-beam geometry on the National Ignition Facility. An experimental campaign at Lawrence Livermore National Laboratory to demonstrate the high-coupling efficiency and radiation symmetry tuning of the Frustraum has been under way since 2021. Simulations benchmarked against experimental data show that implosions using Frustraums can achieve more yield with higher ignition margins than cylindrical Hohlraums using the same laser energy. Hydrodynamic jets in capsules along the Hohlraum axis, driven by radiation-flux asymmetries in a Hohlraum with a gold liner on a depleted uranium (DU) wall, are present around stagnation, and these "polar" jets can cause severe yield degradation. The early-time Legendre mode P4 < 0 radiation-flux asymmetry is a leading cause of these jets, which can be reduced by using an unlined DU Hohlraum because the shape of the shell is predicted to be more prolate. Magnetization can increase the implosion robustness and reduce the required hotspot ρ R for ignition; therefore, magnetizing the Frustraum can maintain the same yield while reducing the required laser energy or increase the yield using the same laser energy—all under the constraint that the ignition margin is preserved. Reducing polar jets is particularly important for magnetized implosions because of the intrinsic toroidal hotspot ion temperature topology. [ABSTRACT FROM AUTHOR]

Published
2024
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9. The Magnetized Indirect Drive Project on the National Ignition Facility

Author

Moody, J. D., Pollock, B. B., Sio, H., Strozzi, D. J., Ho, D. D.-M., Walsh, C., Kemp, G. E., Kucheyev, S. O., Kozioziemski, B., Carroll, E. G., Kroll, J., Yanagisawa, D. K., Angus, J., Bhandarkar, S. D., Bude, J. D., Divol, L., Ferguson, B., Fry, J., Hagler, L., Hartouni, E., Herrmann, M. C., Hsing, W., Holunga, D. M., Javedani, J., Johnson, A., Kalantar, D., Kohut, T., Logan, B. G., Masters, N., Nikroo, A., Orsi, N., Piston, K., Provencher, C., Rowe, A., Sater, J., Skulina, K., Stygar, W. A., Tang, V., Winters, S. E., Chittenden, J. P., Appelbe, B., Boxall, A., Crilly, A., O’Neill, S., Davies, J., Peebles, J., and Fujioka, S.

Published
2022
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10. Jumping to conclusions and suicidal behavior in depression and psychosis

Author

Acevedo, A., Anglès, J., Argany, M.A., Barajas, A., Barrigón, M.L., Beltrán, M., Birulés, I., Bogas, J.L., Camprubí, N., Carbonero, M., Carmona Farrés, C., Carrasco, E., Casañas, R., Cid, J., Conesa, E., Corripio, I., Cortes, P., Crosas, J.M., de Apraiz, A., Delgado, M., Domínguez, L., Escartí, M.J., Escudero, A., Esteban Pinos, I., Figueras, M., Franco, C., García, C., Gil, V., Giménez-Díaz, D., Gonzalez-Casares, R., González Higueras, F., González- Montoro, MaL., González, E., Grasa Bello, E., Guasp, A., Huerta-Ramos, Ma E., Huertas, P., Jiménez-Díaz, A., Lalucat, L.L., LLacer, B., López-Alcayada, R., López- Carrilero, R., Lorente, E., Luengo, A., Mantecón, N., Mas-Expósito, L., Montes, M., Moritz, S., Murgui, E., Nuñez, M., Ochoa, S., Palomer, E., Paniego, E., Peláez, T., Pérez, V., Planell, K., Planellas, C., Pleguezuelo-Garrote, P., Pousa, E., Rabella, M., Renovell, M., Rubio, R., Ruiz- Delgado, I., San Emeterio, M., Sánchez, E., Sanjuán, J., Sans, B., Schilling, L., Sió, H., Teixidó, M., Torres, P., Vila, M.A., Vila-Badia, R., Villegas, F., Villellas, R., Sastre-Buades, Aina, Ochoa, Susana, Lorente-Rovira, Esther, Barajas, Ana, Grasa, Eva, López-Carrilero, Raquel, Luengo, Ana, Ruiz-Delgado, Isabel, Cid, Jordi, González-Higueras, Fermín, Sánchez-Alonso, Sergio, Baca-García, Enrique, and Barrigón, Maria L.

Published
2021
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11. Thermal conductivity measurements of proton-heated warm dense aluminum.

Author

McKelvey, A, Kemp, GE, Sterne, PA, Fernandez-Panella, A, Shepherd, R, Marinak, M, Link, A, Collins, GW, Sio, H, King, J, Freeman, RR, Hua, R, McGuffey, C, Kim, J, Beg, FN, and Ping, Y

Abstract

Thermal conductivity is one of the most crucial physical properties of matter when it comes to understanding heat transport, hydrodynamic evolution, and energy balance in systems ranging from astrophysical objects to fusion plasmas. In the warm dense matter regime, experimental data are very scarce so that many theoretical models remain untested. Here we present the first thermal conductivity measurements of aluminum at 0.5-2.7 g/cc and 2-10 eV, using a recently developed platform of differential heating. A temperature gradient is induced in a Au/Al dual-layer target by proton heating, and subsequent heat flow from the hotter Au to the Al rear surface is detected by two simultaneous time-resolved diagnostics. A systematic data set allows for constraining both thermal conductivity and equation-of-state models. Simulations using Purgatorio model or Sesame S27314 for Al thermal conductivity and LEOS for Au/Al release equation-of-state show good agreement with data after 15 ps. Discrepancy still exists at early time 0-15 ps, likely due to non-equilibrium conditions.

Published
2017

13. The inviscid incompressible limit of Kelvin-Helmholtz instability for plasmas.

Author

Briard, A., Ripoll, J.-F., Michael, A., Grea, B.-J., Peyrichon, G., Cosmides, M., El-Rabii, H., Faganello, M., Merkin, V. G., Sorathia, K. A., Ukhorskiy, A. Y., Lyon, J. G., Retino, A., Bouffetier, V., Ceurvorst, L., Sio, H., Hurricane, O. A., Smalyuk, V. A., Casner, A., and Prajapati, Ram Prasad

Subjects
KELVIN-Helmholtz instability, PLASMA instabilities, MACH number, ASTROPHYSICAL jets, EULER equations, HELMHOLTZ resonators, FLUID-structure interaction
Abstract

Introduction: The Kelvin-Helmholtz Instability (KHI) is an interface instability that develops between two fluids or plasmas flowing with a common shear layer. KHI occurs in astrophysical jets, solar atmosphere, solar flows, cometary tails, planetary magnetospheres. Two applications of interest, encompassing both space and fusion applications, drive this study: KHI formation at the outer flanks of the Earth's magnetosphere and KHI growth from non-uniform laser heating in magnetized direct-drive implosion experiments. Here, we study 2D KHI with or without a magnetic field parallel to the flow. We use both the GAMERA code, which solves the compressible Euler equations, and the STRATOSPEC code, which solves the Navier-Stokes equations under the Boussinesq approximation, coupled with the magnetic field dynamics. GAMERA is a global three-dimensional MHD code with high-order reconstruction in arbitrary nonorthogonal curvilinear coordinates, which is developed for a large range of astrophysical applications. STRATOSPEC is a three-dimensional pseudo- spectral code with an accuracy of infinite order (no numerical diffusion). Magnetized KHI is a canonical case for benchmarking hydrocode simulations with extended MHD options. Methods: An objective is to assess whether or not, and under which conditions, the incompressibility hypothesis allows to describe a dynamic compressible system. For comparing both codes, we reach the inviscid incompressible regime, by decreasing the Mach number in GAMERA, and viscosity and diffusion in STRATOSPEC. Here, we specifically investigate both single-mode and multi-mode initial perturbations, either with or without magnetic field parallel to the flow. The method relies on comparisons of the density fields, 1D profiles of physical quantities averaged along the flow direction, and scale-by-scale spectral densities. We also address the triggering, formation and damping of filamentary structures under varying Mach number or Atwood number, with or without a parallel magnetic field. Results: Comparisons show very satisfactory results between the two codes. The vortices dynamics is well reproduced, along with the breaking or damping of small-scale structures. We end with the extraction of growth rates of magnetized KHI from the compressible regime to the incompressible limit in the linear regime assessing the effects of compressibility under increasing magnetic field. Discussion: The observed differences between the two codes are explained either from diffusion or non-Boussinesq effects. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Extended X-ray absorption fine structure of dynamically-compressed copper up to 1 terapascal

Author

Sio, H., primary, Krygier, A., additional, Braun, D. G., additional, Rudd, R. E., additional, Bonev, S. A., additional, Coppari, F., additional, Millot, M., additional, Fratanduono, D. E., additional, Bhandarkar, N., additional, Bitter, M., additional, Bradley, D. K., additional, Efthimion, P. C., additional, Eggert, J. H., additional, Gao, L., additional, Hill, K. W., additional, Hood, R., additional, Hsing, W., additional, Izumi, N., additional, Kemp, G., additional, Kozioziemski, B., additional, Landen, O. L., additional, Le Galloudec, K., additional, Lockard, T. E., additional, Mackinnon, A., additional, McNaney, J. M., additional, Ose, N., additional, Park, H.-S., additional, Remington, B. A., additional, Schneider, M. B., additional, Stoupin, S., additional, Thorn, D. B., additional, Vonhof, S., additional, Wu, C. J., additional, and Ping, Y., additional

Published
2023
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15. Performance scaling with an applied magnetic field in indirect-drive inertial confinement fusion implosions

Author

Sio, H., primary, Moody, J. D., additional, Pollock, B. B., additional, Strozzi, D. J., additional, Ho, D. D.-M., additional, Walsh, C. A., additional, Kemp, G. E., additional, Lahmann, B., additional, Kucheyev, S. O., additional, Kozioziemski, B., additional, Carroll, E. G., additional, Kroll, J., additional, Yanagisawa, D. K., additional, Angus, J., additional, Bachmann, B., additional, Baker, A. A., additional, Bayu Aji, L. B., additional, Bhandarkar, S. D., additional, Bude, J. D., additional, Divol, L., additional, Engwall, A. M., additional, Ferguson, B., additional, Fry, J., additional, Hagler, L., additional, Hartouni, E., additional, Herrmann, M. C., additional, Hsing, W., additional, Holunga, D. M., additional, Javedani, J., additional, Johnson, A., additional, Khan, S., additional, Kalantar, D., additional, Kohut, T., additional, Logan, B. G., additional, Masters, N., additional, Nikroo, A., additional, Izumi, N., additional, Orsi, N., additional, Piston, K., additional, Provencher, C., additional, Rowe, A., additional, Sater, J., additional, Shin, S. J., additional, Skulina, K., additional, Stygar, W. A., additional, Tang, V., additional, Winters, S. E., additional, Zimmerman, G., additional, Chittenden, J. P., additional, Appelbe, B., additional, Boxall, A., additional, Crilly, A., additional, O'Neill, S., additional, Barnak, D., additional, Davies, J., additional, Peebles, J., additional, Bae, J. H., additional, Clark, K., additional, Havre, M., additional, Mauldin, M., additional, Ratledge, M., additional, Vonhof, S., additional, Adrian, P., additional, Reichelt, B., additional, Fujioka, S., additional, and Fraenkel, M., additional

Published
2023
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16. Determining spectral response of the National Ignition Facility particle time of flight diagnostic to x rays

Author

Reichelt, B., primary, Kabadi, N., additional, Pearcy, J., additional, Gatu Johnson, M., additional, Dannhoff, S., additional, Lahmann, B., additional, Frenje, J., additional, Li, C. K., additional, Sutcliffe, G., additional, Kunimune, J., additional, Petrasso, R., additional, Sio, H., additional, Moore, A., additional, Mariscal, E., additional, and Hartouni, E., additional

Published
2023
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17. A direct-drive exploding-pusher implosion as the first step in development of a monoenergetic charged-particle backlighting platform at the National Ignition Facility

Author

Rosenberg, M.J., Zylstra, A.B., Séguin, F.H., Rinderknecht, H.G., Frenje, J.A., Gatu Johnson, M., Sio, H., Waugh, C.J., Sinenian, N., Li, C.K., Petrasso, R.D., LePape, S., Ma, T., Mackinnon, A.J., Rygg, J.R., Amendt, P.A., Bellei, C., Benedetti, L.R., Berzak Hopkins, L., Bionta, R.M., Casey, D.T., Divol, L., Edwards, M.J., Glenn, S., Glenzer, S.H., Hicks, D.G., Kimbrough, J.R., Landen, O.L., Lindl, J.D., MacPhee, A., McNaney, J.M., Meezan, N.B., Moody, J.D., Moran, M.J., Park, H.-S., Pino, J., Remington, B.A., Robey, H., Rosen, M.D., Wilks, S.C., Zacharias, R.A., McKenty, P.W., Hohenberger, M., Radha, P.B., Edgell, D., Marshall, F.J., Delettrez, J.A., Glebov, V.Yu., Betti, R., Goncharov, V.N., Knauer, J.P., Sangster, T.C., Herrmann, H.W., Hoffman, N.M., Kyrala, G.A., Leeper, R.J., Olson, R.E., Kilkenny, J.D., and Nikroo, A.

Published
2016
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18. Measurements of ion-electron energy-transfer cross section in high-energy-density plasmas

Author

Adrian, P. J., primary, Florido, R., additional, Grabowski, P. E., additional, Mancini, R., additional, Bachmann, B., additional, Benedict, L. X., additional, Johnson, M. Gatu, additional, Kabadi, N., additional, Lahmann, B., additional, Li, C. K., additional, Petrasso, R. D., additional, Rinderknecht, H. G., additional, Regan, S. P., additional, Séguin, F. H., additional, Singleton, R. L., additional, Sio, H., additional, Sutcliffe, G. D., additional, Whitley, H. D., additional, and Frenje, J. A., additional

Published
2022
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19. Experimental evidence of early-time saturation of the ion-Weibel instability in counterstreaming plasmas of CH, Al, and Cu

Author

Manuel, M. J.-E., primary, Adams, M. B. P., additional, Ghosh, S., additional, Beg, F. N., additional, Bolaños, S., additional, Huntington, C. M., additional, Jonnalagadda, R., additional, Kawahito, D., additional, Pollock, B. B., additional, Remington, B. A., additional, Ross, J. S., additional, Ryutov, D. D., additional, Sio, H., additional, Swadling, G. F., additional, Tzeferacos, P., additional, and Park, H.-S., additional

Published
2022
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20. Increased Ion Temperature and Neutron Yield Observed in Magnetized Indirectly Driven D2 -Filled Capsule Implosions on the National Ignition Facility

Author

Moody, J. D., primary, Pollock, B. B., additional, Sio, H., additional, Strozzi, D. J., additional, Ho, D. D.-M., additional, Walsh, C. A., additional, Kemp, G. E., additional, Lahmann, B., additional, Kucheyev, S. O., additional, Kozioziemski, B., additional, Carroll, E. G., additional, Kroll, J., additional, Yanagisawa, D. K., additional, Angus, J., additional, Bachmann, B., additional, Bhandarkar, S. D., additional, Bude, J. D., additional, Divol, L., additional, Ferguson, B., additional, Fry, J., additional, Hagler, L., additional, Hartouni, E., additional, Herrmann, M. C., additional, Hsing, W., additional, Holunga, D. M., additional, Izumi, N., additional, Javedani, J., additional, Johnson, A., additional, Khan, S., additional, Kalantar, D., additional, Kohut, T., additional, Logan, B. G., additional, Masters, N., additional, Nikroo, A., additional, Orsi, N., additional, Piston, K., additional, Provencher, C., additional, Rowe, A., additional, Sater, J., additional, Skulina, K., additional, Stygar, W. A., additional, Tang, V., additional, Winters, S. E., additional, Zimmerman, G., additional, Adrian, P., additional, Chittenden, J. P., additional, Appelbe, B., additional, Boxall, A., additional, Crilly, A., additional, O’Neill, S., additional, Davies, J., additional, Peebles, J., additional, and Fujioka, S., additional

Published
2022
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21. X-ray source characterization and sample heating on x-ray diffraction experiments at the National Ignition Facility

Author

Krygier, A., primary, Wehrenberg, C. E., additional, Bernier, J. V., additional, Clarke, S., additional, Coleman, A. L., additional, Coppari, F., additional, Duffy, T. S., additional, Gorman, M. G., additional, Hohenberger, M., additional, Kalantar, D., additional, Kemp, G. E., additional, Khan, S. F., additional, Krauland, C., additional, Kraus, R. G., additional, Lazicki, A., additional, MacDonald, M. J., additional, MacPhee, A. G., additional, Marley, E., additional, Marshall, M. C., additional, May, M., additional, McNaney, J. M., additional, Millot, M., additional, Ping, Y., additional, Poole, P. L., additional, Rygg, J. R., additional, Schneider, M., additional, Sio, H., additional, Stoupin, S., additional, Swift, D., additional, Yeamans, C., additional, Zobrist, T., additional, Smith, R. F., additional, and Eggert, J. H., additional

Published
2022
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22. The phase-2 particle x-ray temporal diagnostic for simultaneous measurement of multiple x-ray and nuclear emission histories from OMEGA implosions (invited)

Author

Kabadi, N., primary, Adrian, P., additional, Stoeckl, C., additional, Sorce, A., additional, Sio, H. W., additional, Bedzyk, M., additional, Evans, T., additional, Ivancic, S., additional, Katz, J., additional, Knauer, J., additional, Pearcy, J., additional, Weiner, D., additional, Betti, R., additional, Birkel, A., additional, Cao, D., additional, Johnson, M. Gatu, additional, Regan, S. P., additional, Petrasso, R. D., additional, and Frenje, J., additional

Published
2022
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23. A new class of variable-radii diffraction optics for high-resolution x-ray spectroscopy at the National Ignition Facility (invited)

Author

Pablant, N. A., primary, Bitter, M., additional, Gao, L., additional, Dozieres, M., additional, Efthimion, P. C., additional, Frisch, G., additional, Hill, K. W., additional, Hordin, T., additional, Kozioziemski, B., additional, Krygier, A., additional, MacDonald, M. J., additional, Ose, N., additional, Ping, Y., additional, Sagan, D., additional, Schneider, M. B., additional, Sio, H., additional, Stoupin, S., additional, and Yakusevitch, Y., additional

Published
2022
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24. EXAFS for probing thermal states of compressed materials at NIF

Author

Ping, Yuan, primary, Sio, H., primary, Krygier, Andrew, primary, Braun, David, primary, Rudd, Robert, primary, Bonev, Stanimir, primary, Kemp, Gregory, primary, Millot, Marius, primary, Fratanduono, Dayne, primary, Coleman, Amy, primary, Coppari, Federica, primary, Izumi, Nobuhiko, primary, Stoupin, Stanislav, primary, Eggert, Jon, primary, Park, Hye-Sook, primary, Schneider, Marilyn, primary, McNaney, James, primary, Bradley, David, primary, Hsing, Warren, primary, Ose, Neil, primary, Kozioziemski, Bernard, primary, Mackinnon, Andrew, primary, Gao, Lan, primary, Hill, Kenneth, primary, Pablant, Novimir, primary, Bitter, Manfred, primary, Kraus, Brian, primary, and Efthimion, Philip, primary

Published
2022
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25. Fuel–shell mix and yield degradation in kinetic shock-driven inertial confinement fusion implosions

Author

Sio, H., primary, Larroche, O., additional, Bose, A., additional, Atzeni, S., additional, Frenje, J. A., additional, Kabadi, N. V., additional, Gatu Johnson, M., additional, Li, C. K., additional, Glebov, V., additional, Stoeckl, C., additional, Lahmann, B., additional, Adrian, P. J., additional, Regan, S. P., additional, Birkel, A., additional, Seguin, F. H., additional, and Petrasso, R. D., additional

Published
2022
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26. Design and Experiment of Capacitive Micromachined Ultrasonic Transducer Array for High-frequency Underwater Imaging

Author

Shuang Zhang, Peng U. Mak, Sio H. Pun, Ching H. Cheng, Kin F. Lei, Mang I Vai, Weibao Qiu, Jiujiang Wang, Xin Liu, and Yuanyu Yu

Subjects
Materials science, Underwater imaging, Acoustics, Capacitive sensing, Ultrasonic transducer array, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
Abstract

Background:: Ultrasound is widely used in the applications of underwater imaging. Capacitive micromachined ultrasonic transducer (CMUT) is a promising candidate for the traditional piezoelectric ultrasonic transducer. In underwater ultrasound imaging, better resolutions can be achieved with a higher frequency ultrasound. Therefore, a CMUT array for high-frequency ultrasound imaging is proposed in this work. Methods:: Analytical methods were used to calculate the center frequency in water and the pull-in voltage for determining the operating point of CMUT. A finite element method model was developed to finalize the design parameters. The CMUT array was fabricated with a five-mask sacrificial release process. Results:: The CMUT array owned an immersed center frequency of 2.6 MHz with a 6 dB fractional bandwidth of 123 %. The pull-in voltage of the CMUT array was 85 V. An underwater imaging experiment was carried out with the target of three steel wires. Conclusion:: In this study, we have developed CMUT for high-frequency underwater imaging. The experiment showed that the CMUT could detect the steel wires with a diameter of 100 μm and the axial resolution was 0.582 mm, which was close to one wavelength of ultrasound in 2.6 MHz

Published
2021

27. Magnetized ICF Implosions: Scaling of Temperature and Yield Enhancement

Author

Walsh, C. A., primary, O'Neill, S., additional, Chittenden, J., additional, Crilly, A., additional, Appelbe, B., additional, Strozzi, D., additional, Ho, D., additional, Sio, H., additional, Pollock, B., additional, Divol, L., additional, Hartouni, E., additional, Rosen, M., additional, Logan, G., additional, and Moody, J. D., additional

Published
2022
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28. Effect of Strongly Magnetized Electrons and Ions on Heat Flow and Symmetry of Inertial Fusion Implosions

Author

Bose, A., primary, Peebles, J., additional, Walsh, C. A., additional, Frenje, J. A., additional, Kabadi, N. V., additional, Adrian, P. J., additional, Sutcliffe, G. D., additional, Gatu Johnson, M., additional, Frank, C. A., additional, Davies, J. R., additional, Betti, R., additional, Glebov, V. Yu., additional, Marshall, F. J., additional, Regan, S. P., additional, Stoeckl, C., additional, Campbell, E. M., additional, Sio, H., additional, Moody, J., additional, Crilly, A., additional, Appelbe, B. D., additional, Chittenden, J. P., additional, Atzeni, S., additional, Barbato, F., additional, Forte, A., additional, Li, C. K., additional, Seguin, F. H., additional, and Petrasso, R. D., additional

Published
2022
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29. Lawson Criterion for Ignition Exceeded in an Inertial Fusion Experiment

Author

Abu-Shawareb, H, Acree, R, Adams, P, Adams, J, Addis, B, Aden, R, Adrian, P, Afeyan, BB, Aggleton, M, Aghaian, L, Aguirre, A, Aikens, D, Akre, J, Albert, F, Albrecht, M, Albright, BJ, Albritton, J, Alcala, J, Alday, C, Alessi, DA, Alexander, N, Alfonso, J, Alfonso, N, Alger, E, Ali, SJ, Ali, ZA, Alley, WE, Amala, P, Amendt, PA, Amick, P, Ammula, S, Amorin, C, Ampleford, DJ, Anderson, RW, Anklam, T, Antipa, N, Appelbe, B, Aracne-Ruddle, C, Araya, E, Arend, M, Arnold, P, Arnold, T, Asay, J, Atherton, LJ, Atkinson, D, Atkinson, R, Auerbach, JM, Austin, B, Auyang, L, Awwal, AS, Ayers, J, Ayers, S, Ayers, T, Azevedo, S, Bachmann, B, Back, CA, Bae, J, Bailey, DS, Bailey, J, Baisden, T, Baker, KL, Baldis, H, Barber, D, Barberis, M, Barker, D, Barnes, A, Barnes, CW, Barrios, MA, Barty, C, Bass, I, Batha, SH, Baxamusa, SH, Bazan, G, Beagle, JK, Beale, R, Beck, BR, Beck, JB, Bedzyk, M, Beeler, RG, Behrendt, W, Belk, L, Bell, P, Belyaev, M, Benage, JF, Bennett, G, Benedetti, LR, Benedict, LX, Berger, R, Bernat, T, Bernstein, LA, Berry, B, Bertolini, L, Besenbruch, G, Betcher, J, Bettenhausen, R, Betti, R, Bezzerides, B, Bhandarkar, SD, Bickel, R, Biener, J, Biesiada, T, Bigelow, K, Bigelow-Granillo, J, Bigman, V, Bionta, RM, Birge, NW, Bitter, M, Black, AC, Bleile, R, Bleuel, DL, Bliss, E, Blue, B, Boehly, T, Boehm, K, Boley, CD, Bonanno, R, Bond, EJ, Bond, T, Bonino, MJ, Borden, M, Bourgade, J-L, Bousquet, J, Bowers, J, Bowers, M, Boyd, R, Bozek, A, Bradley, DK, Bradley, KS, Bradley, PA, Bradley, L, Brannon, L, Brantley, PS, Braun, D, Braun, T, Brienza-Larsen, K, Briggs, TM, Britten, J, Brooks, ED, Browning, D, Bruhn, MW, Brunner, TA, Bruns, H, Brunton, G, Bryant, B, Buczek, T, Bude, J, Buitano, L, Burkhart, S, Burmark, J, Burnham, A, Burr, R, Busby, LE, Butlin, B, Cabeltis, R, Cable, M, Cabot, WH, Cagadas, B, Caggiano, J, Cahayag, R, Caldwell, SE, Calkins, S, Callahan, DA, Calleja-Aguirre, J, Camara, L, Camp, D, Campbell, EM, Campbell, JH, Carey, B, Carey, R, Carlisle, K, Carlson, L, Carman, L, Carmichael, J, Carpenter, A, Carr, C, Carrera, JA, Casavant, D, Casey, A, Casey, DT, Castillo, A, Castillo, E, Castor, JI, Castro, C, Caughey, W, Cavitt, R, Celeste, J, Celliers, PM, Cerjan, C, Chandler, G, Chang, B, Chang, C, Chang, J, Chang, L, Chapman, R, Chapman, T, Chase, L, Chen, H, Chen, K, Chen, L-Y, Cheng, B, Chittenden, J, Choate, C, Chou, J, Chrien, RE, Chrisp, M, Christensen, K, Christensen, M, Christopherson, AR, Chung, M, Church, JA, Clark, A, Clark, DS, Clark, K, Clark, R, Claus, L, Cline, B, Cline, JA, Cobble, JA, Cochrane, K, Cohen, B, Cohen, S, Collette, MR, Collins, G, Collins, LA, Collins, TJB, Conder, A, Conrad, B, Conyers, M, Cook, AW, Cook, D, Cook, R, Cooley, JC, Cooper, G, Cope, T, Copeland, SR, Coppari, F, Cortez, J, Cox, J, Crandall, DH, Crane, J, Craxton, RS, Cray, M, Crilly, A, Crippen, JW, Cross, D, Cuneo, M, Cuotts, G, Czajka, CE, Czechowicz, D, Daly, T, Danforth, P, Darbee, R, Darlington, B, Datte, P, Dauffy, L, Davalos, G, Davidovits, S, Davis, P, Davis, J, Dawson, S, Day, RD, Day, TH, Dayton, M, Deck, C, Decker, C, Deeney, C, DeFriend, KA, Deis, G, Delamater, ND, Delettrez, JA, Demaret, R, Demos, S, Dempsey, SM, Desjardin, R, Desjardins, T, Desjarlais, MP, Dewald, EL, DeYoreo, J, Diaz, S, Dimonte, G, Dittrich, TR, Divol, L, Dixit, SN, Dixon, J, Dodd, ES, Dolan, D, Donovan, A, Donovan, M, Döppner, T, Dorrer, C, Dorsano, N, Douglas, MR, Dow, D, Downie, J, Downing, E, Dozieres, M, Draggoo, V, Drake, D, Drake, RP, Drake, T, Dreifuerst, G, DuBois, DF, DuBois, PF, Dunham, G, Dylla-Spears, R, Dymoke-Bradshaw, AKL, Dzenitis, B, Ebbers, C, Eckart, M, Eddinger, S, Eder, D, Edgell, D, Edwards, MJ, Efthimion, P, Eggert, JH, Ehrlich, B, Ehrmann, P, Elhadj, S, Ellerbee, C, Elliott, NS, Ellison, CL, Elsner, F, Emerich, M, Engelhorn, K, England, T, English, E, Epperson, P, Epstein, R, Erbert, G, Erickson, MA, Erskine, DJ, Erlandson, A, Espinosa, RJ, Estes, C, Estabrook, KG, Evans, S, Fabyan, A, Fair, J, Fallejo, R, 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Hilsabeck, T, Hinkel, DE, Ho, DD, Ho, VK, Hoffer, JK, Hoffman, NM, Hohenberger, M, Hohensee, M, Hoke, W, Holdener, D, Holdener, F, Holder, JP, Holko, B, Holunga, D, Holzrichter, JF, Honig, J, Hoover, D, Hopkins, D, Berzak Hopkins, L, Hoppe, M, Hoppe, ML, Horner, J, Hornung, R, Horsfield, CJ, Horvath, J, Hotaling, D, House, R, Howell, L, Hsing, WW, Hu, SX, Huang, H, Huckins, J, Hui, H, Humbird, KD, Hund, J, Hunt, J, Hurricane, OA, Hutton, M, Huynh, KH-K, Inandan, L, Iglesias, C, Igumenshchev, IV, Izumi, N, Jackson, M, Jackson, J, Jacobs, SD, James, G, Jancaitis, K, Jarboe, J, Jarrott, LC, Jasion, D, Jaquez, J, Jeet, J, Jenei, AE, Jensen, J, Jimenez, J, Jimenez, R, Jobe, D, Johal, Z, Johns, HM, Johnson, D, Johnson, MA, Gatu Johnson, M, Johnson, RJ, Johnson, S, Johnson, SA, Johnson, T, Jones, K, Jones, O, Jones, M, Jorge, R, Jorgenson, HJ, Julian, M, Jun, BI, Jungquist, R, Kaae, J, Kabadi, N, Kaczala, D, Kalantar, D, Kangas, K, Karasiev, VV, Karasik, M, Karpenko, V, Kasarky, A, Kasper, K, Kauffman, R, Kaufman, MI, Keane, C, Keaty, L, Kegelmeyer, L, Keiter, PA, Kellett, PA, Kellogg, J, Kelly, JH, Kemic, S, Kemp, AJ, Kemp, GE, Kerbel, GD, Kershaw, D, Kerr, SM, Kessler, TJ, Key, MH, Khan, SF, Khater, H, Kiikka, C, Kilkenny, J, Kim, Y, Kim, Y-J, Kimko, J, Kimmel, M, Kindel, JM, King, J, Kirkwood, RK, Klaus, L, Klem, D, Kline, JL, Klingmann, J, Kluth, G, Knapp, P, Knauer, J, Knipping, J, Knudson, M, Kobs, D, Koch, J, Kohut, T, Kong, C, Koning, JM, Koning, P, Konior, S, Kornblum, H, Kot, LB, Kozioziemski, B, Kozlowski, M, Kozlowski, PM, Krammen, J, Krasheninnikova, NS, Kraus, B, Krauser, W, Kress, JD, Kritcher, AL, Krieger, E, Kroll, JJ, Kruer, WL, Kruse, MKG, Kucheyev, S, Kumbera, M, Kumpan, S, Kunimune, J, Kustowski, B, Kwan, TJT, Kyrala, GA, Laffite, S, Lafon, M, LaFortune, K, Lahmann, B, Lairson, B, Landen, OL, Langenbrunner, J, Lagin, L, Land, T, Lane, M, Laney, D, Langdon, AB, Langer, SH, Langro, A, Lanier, NE, Lanier, TE, Larson, D, Lasinski, BF, Lassle, D, LaTray, D, Lau, G, Lau, N, Laumann, C, Laurence, A, Laurence, TA, Lawson, J, Le, HP, Leach, RR, Leal, L, Leatherland, A, LeChien, K, Lechleiter, B, Lee, A, Lee, M, Lee, T, Leeper, RJ, Lefebvre, E, Leidinger, J-P, LeMire, B, Lemke, RW, Lemos, NC, Le Pape, S, Lerche, R, Lerner, S, Letts, S, Levedahl, K, Lewis, T, Li, CK, Li, H, Li, J, Liao, W, Liao, ZM, Liedahl, D, Liebman, J, Lindford, G, Lindman, EL, Lindl, JD, Loey, H, London, RA, Long, F, Loomis, EN, Lopez, FE, Lopez, H, Losbanos, E, Loucks, S, Lowe-Webb, R, Lundgren, E, Ludwigsen, AP, Luo, R, Lusk, J, Lyons, R, Ma, T, Macallop, Y, MacDonald, MJ, MacGowan, BJ, Mack, JM, Mackinnon, AJ, MacLaren, SA, MacPhee, AG, Magelssen, GR, Magoon, J, Malone, RM, Malsbury, T, Managan, R, Mancini, R, Manes, K, Maney, D, Manha, D, Mannion, OM, Manuel, AM, Mapoles, E, Mara, G, Marcotte, T, Marin, E, Marinak, MM, Mariscal, C, Mariscal, DA, Mariscal, EF, Marley, EV, Marozas, JA, Marquez, R, Marshall, CD, Marshall, FJ, Marshall, M, Marshall, S, Marticorena, J, 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BT, Sinars, D, Singh, P, Sio, H, Skulina, K, Skupsky, S, Slutz, S, Sluyter, M, Smalyuk, VA, Smauley, D, Smeltser, RM, Smith, C, Smith, I, Smith, J, Smith, L, Smith, R, Sohn, R, Sommer, S, Sorce, C, Sorem, M, Soures, JM, Spaeth, ML, Spears, BK, Speas, S, Speck, D, Speck, R, Spears, J, Spinka, T, Springer, PT, Stadermann, M, Stahl, B, Stahoviak, J, Stanton, LG, Steele, R, Steele, W, Steinman, D, Stemke, R, Stephens, R, Sterbenz, S, Sterne, P, Stevens, D, Stevers, J, Still, CB, Stoeckl, C, Stoeffl, W, Stolken, JS, Stolz, C, Storm, E, Stone, G, Stoupin, S, Stout, E, Stowers, I, Strauser, R, Streckart, H, Streit, J, Strozzi, DJ, Suratwala, T, Sutcliffe, G, Suter, LJ, Sutton, SB, Svidzinski, V, Swadling, G, Sweet, W, Szoke, A, Tabak, M, Takagi, M, Tambazidis, A, Tang, V, Taranowski, M, Taylor, LA, Telford, S, Theobald, W, Thi, M, Thomas, A, Thomas, CA, Thomas, I, Thomas, R, Thompson, IJ, Thongstisubskul, A, Thorsness, CB, Tietbohl, G, Tipton, RE, Tobin, M, Tomlin, N, Tommasini, R, Toreja, AJ, Torres, J, Town, RPJ, Townsend, S, Trenholme, J, Trivelpiece, A, Trosseille, C, Truax, H, Trummer, D, Trummer, S, Truong, T, Tubbs, D, Tubman, ER, Tunnell, T, Turnbull, D, Turner, RE, Ulitsky, M, Upadhye, R, Vaher, JL, VanArsdall, P, VanBlarcom, D, Vandenboomgaerde, M, VanQuinlan, R, Van Wonterghem, BM, Varnum, WS, Velikovich, AL, Vella, A, Verdon, CP, Vermillion, B, Vernon, S, Vesey, R, Vickers, J, Vignes, RM, Visosky, M, Vocke, J, Volegov, PL, Vonhof, S, Von Rotz, R, Vu, HX, Vu, M, Wall, D, Wall, J, Wallace, R, Wallin, B, Walmer, D, Walsh, CA, Walters, CF, Waltz, C, Wan, A, Wang, A, Wang, Y, Wark, JS, Warner, BE, Watson, J, Watt, RG, Watts, P, Weaver, J, Weaver, RP, Weaver, S, Weber, CR, Weber, P, Weber, SV, Wegner, P, Welday, B, Welser-Sherrill, L, Weiss, K, Widmann, K, Wheeler, GF, Whistler, W, White, RK, Whitley, HD, Whitman, P, Wickett, ME, Widmayer, C, Wiedwald, J, Wilcox, R, Wilcox, S, Wild, C, Wilde, BH, Wilde, CH, Wilhelmsen, K, Wilke, MD, Wilkens, H, Wilkins, P, Wilks, SC, Williams, EA, Williams, GJ, Williams, W, Williams, WH, Wilson, DC, Wilson, B, Wilson, E, Wilson, R, Winters, S, Wisoff, J, Wittman, M, Wolfe, J, Wong, A, Wong, KW, Wong, L, Wong, N, Wood, R, Woodhouse, D, Woodruff, J, Woods, DT, Woods, S, Woodworth, BN, Wooten, E, Wootton, A, Work, K, Workman, JB, Wright, J, Wu, M, Wuest, C, Wysocki, FJ, Xu, H, Yamaguchi, M, Yang, B, Yang, ST, Yatabe, J, Yeamans, CB, Yee, BC, Yi, SA, Yin, L, Young, B, Young, CS, Young, CV, Young, P, Youngblood, K, Zacharias, R, Zagaris, G, Zaitseva, N, Zaka, F, Ze, F, Zeiger, B, Zika, M, Zimmerman, GB, Zobrist, T, Zuegel, JD, Zylstra, AB, Indirect Drive ICF Collaboration, Collaboration, Indirect Drive ICF, AWE Plc, Lawrence Livermore National Laboratory, and U.S Department of Energy

Subjects
General Physics, 02 Physical Sciences, General Physics and Astronomy, Indirect Drive ICF Collaboration, 01 Mathematical Sciences, 09 Engineering
Abstract

For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as a proof of principle of various fusion concepts. Following the Lawson criterion, an ignited plasma is one where the fusion heating power is high enough to overcome all the physical processes that cool the fusion plasma, creating a positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, ignition is a state where the fusion plasma can begin "burn propagation" into surrounding cold fuel, enabling the possibility of high energy gain. While "scientific breakeven" (i.e., unity target gain) has not yet been achieved (here target gain is 0.72, 1.37 MJ of fusion for 1.92 MJ of laser energy), this Letter reports the first controlled fusion experiment, using laser indirect drive, on the National Ignition Facility to produce capsule gain (here 5.8) and reach ignition by nine different formulations of the Lawson criterion.

Published
2022

30. Nonlinear Evolution of the Ion-Weibel Instability in Interpenetrating Plasmas of CH, Al, and Cu

Author

Manuel, M. J.-E., primary, Ghosh, S., additional, Jonnalagadda, R., additional, Beg, F., additional, Adamss, M., additional, Tzeferacos, P., additional, Huntington, C. M., additional, Remington, B. A., additional, Ross, J. S., additional, Ryutov, D. D., additional, Sio, H., additional, Swadling, G. F., additional, Wilks, S. C., additional, Park, H.-S., additional, and Sakawa, Y., additional

Published
2021
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31. FY16 LLNL Omega Experimental Programs

Author

Heeter, R., primary, Ali, S., additional, Benstead, J., additional, Celliers, P., additional, Coppari, F., additional, Eggert, J., additional, Erskine, D., additional, Panella, A., additional, Fratanduono, D., additional, Hua, R., additional, Huntington, C., additional, Jarrott, L., additional, Jiang, S., additional, Kraus, R., additional, Lazicki, A., additional, LePape, S., additional, Martinez, D., additional, McNaney, J., additional, Millot, M., additional, Moody, J., additional, Pak, A., additional, Park, H., additional, Ping, Y., additional, Pollock, B., additional, Rinderknecht, H., additional, Ross, J., additional, Rubery, M., additional, Sio, H., additional, Smith, R., additional, Swadling, G., additional, Wehrenberg, C., additional, Collins, G., additional, Landen, O., additional, Wan, A., additional, and Hsing, W., additional

Published
2016
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32. Thermal decoupling of deuterium and tritium during the inertial confinement fusion shock-convergence phase

Author

Kabadi, N. V., primary, Simpson, R., additional, Adrian, P. J., additional, Bose, A., additional, Frenje, J. A., additional, Gatu Johnson, M., additional, Lahmann, B., additional, Li, C. K., additional, Parker, C. E., additional, Séguin, F. H., additional, Sutcliffe, G. D., additional, Petrasso, R. D., additional, Atzeni, S., additional, Eriksson, J., additional, Forrest, C., additional, Fess, S., additional, Glebov, V. Yu, additional, Janezic, R., additional, Mannion, O. M., additional, Rinderknecht, H. G., additional, Rosenberg, M. J., additional, Stoeckl, C., additional, Kagan, G., additional, Hoppe, M., additional, Luo, R., additional, Schoff, M., additional, Shuldberg, C., additional, Sio, H. W., additional, Sanchez, J., additional, Hopkins, L. Berzak, additional, Schlossberg, D., additional, Hahn, K., additional, and Yeamans, C., additional

Published
2021
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33. Techniques for studying materials under extreme states of high energy density compression

Author

Park, Hye-Sook, primary, Ali, S. J. M., additional, Celliers, P. M., additional, Coppari, F., additional, Eggert, J., additional, Krygier, A., additional, Lazicki, A. E., additional, Mcnaney, J. M., additional, Millot, M., additional, Ping, Y., additional, Rudd, R. E., additional, Remington, B. A., additional, Sio, H., additional, Smith, R. F., additional, Knudson, M. D., additional, and McBride, E. E., additional

Published
2021
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34. Thermal decoupling of deuterium and tritium during the ICF shock-convergence phase

Author

Kabadi, N. V., Simpson, R., Adrian, P. J., Bose, A., Frenje, J. A., Gatu Johnson, M., Lahmann, B., C. K., Li, Parker, C. E., Seguin, F. H., Sutclife, G. D., Petrasso, R. D., Atzeni, S., Eriksson, J., Forrest, C., Fess, S., Yu Glebov, V., Janezic, R., Mannion, O., Rinderknecht, H. G., Rosenberg, M. J., Stoeckl, C., Kagan, G., Hoppe, M., Luo, R., Scho, M., Shuldberg, C., Sio, H. W., Sanchez, J., Berzak Hopkins, L., Schlossberg, D., Hahn, K., and Yeamans, C.

Subjects
inertial confinement fusion, shock-driven implosion, Plasma physics
Published
2021

35. Thermal decoupling of deuterium and tritium during the inertial confinement fusion shock-convergence phase

Author

V. Kabadi, N., Simpson, R., Adrian, P. J., Bose, A., Frenje, J. A., Johnson, M. Gatu, Lahmann, B., Li, C. K., Parker, C. E., Seguin, F. H., Sutcliffe, G. D., Petrasso, R. D., Atzeni, S., Eriksson, Jacob, Forrest, C., Fess, S., Glebov, V. Yu, Janezic, R., Mannion, O. M., Rinderknecht, H. G., Rosenberg, M. J., Stoeckl, C., Kagan, G., Hoppe, M., Luo, R., Schoff, M., Shuldberg, C., Sio, H. W., Sanchez, J., Hopkins, L. Berzak, Schlossberg, D., Hahn, K., Yeamans, C., V. Kabadi, N., Simpson, R., Adrian, P. J., Bose, A., Frenje, J. A., Johnson, M. Gatu, Lahmann, B., Li, C. K., Parker, C. E., Seguin, F. H., Sutcliffe, G. D., Petrasso, R. D., Atzeni, S., Eriksson, Jacob, Forrest, C., Fess, S., Glebov, V. Yu, Janezic, R., Mannion, O. M., Rinderknecht, H. G., Rosenberg, M. J., Stoeckl, C., Kagan, G., Hoppe, M., Luo, R., Schoff, M., Shuldberg, C., Sio, H. W., Sanchez, J., Hopkins, L. Berzak, Schlossberg, D., Hahn, K., and Yeamans, C.

Abstract

A series of thin glass-shell shock-driven DT gas-filled capsule implosions was conducted at the OMEGA laser facility. These experiments generate conditions relevant to the central plasma during the shock-convergence phase of ablatively driven inertial confinement fusion (ICF) implosions. The spectral temperatures inferred from the DTn and DDn spectra are most consistent with a two-ion-temperature plasma, where the initial apparent temperature ratio, T-T/T-D, is 1.5. This is an experimental confirmation of the long-standing conjecture that plasma shocks couple energy directly proportional to the species mass in multi-ion plasmas. The apparent temperature ratio trend with equilibration time matches expected thermal equilibration described by hydrodynamic theory. This indicates that deuterium and tritium ions have different energy distributions for the time period surrounding shock convergence in ignition-relevant ICF implosions.

Published
2021
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36. The multi-optics high-resolution absorption x-ray spectrometer (HiRAXS) for studies of materials under extreme conditions

Author

Stoupin, S., primary, Thorn, D. B., additional, Ose, N., additional, Gao, L., additional, Hill, K. W., additional, Ping, Y., additional, Coppari, F., additional, Kozioziemski, B., additional, Krygier, A., additional, Sio, H., additional, Ayers, J., additional, Bitter, M., additional, Kraus, B., additional, Efthimion, P. C., additional, and Schneider, M. B., additional

Published
2021
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37. An x-ray penumbral imager for measurements of electron–temperature profiles in inertial confinement fusion implosions at OMEGA

Author

Adrian, P. J., primary, Frenje, J., additional, Aguirre, B., additional, Bachmann, B., additional, Birkel, A., additional, Johnson, M. Gatu, additional, Kabadi, N. V., additional, Lahmann, B., additional, Li, C. K., additional, Mannion, O. M., additional, Martin, W., additional, Mohamed, Z. L., additional, Regan, S. P., additional, Rinderknecht, H. G., additional, Scheiner, B., additional, Schmitt, M. J., additional, Séguin, F. H., additional, Shah, R. C., additional, Sio, H., additional, Sorce, C., additional, Sutcliffe, G. D., additional, and Petrasso, R. D., additional

Published
2021
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40. Experimental validation of low-Z ion-stopping formalisms around the Bragg peak in high-energy-density plasmas

Author

Massachusetts Institute of Technology. Plasma Science and Fusion Center, Frenje, Johan A, Florido, R., Mancini, R., Nagayama, T., Grabowski, P. E., Rinderknecht, H., Sio, H., Zylstra, A., Gatu Johnson, Maria, Li, Chikang, Seguin, Fredrick Hampton, Petrasso, Richard D., Glebov, V. Yu, Regan, S. P., Frenje, J. A., Massachusetts Institute of Technology. Plasma Science and Fusion Center, Frenje, Johan A, Florido, R., Mancini, R., Nagayama, T., Grabowski, P. E., Rinderknecht, H., Sio, H., Zylstra, A., Gatu Johnson, Maria, Li, Chikang, Seguin, Fredrick Hampton, Petrasso, Richard D., Glebov, V. Yu, Regan, S. P., and Frenje, J. A.

Abstract

We report on the first accurate validation of low-Z ion-stopping formalisms in the regime ranging from low-velocity ion stopping—through the Bragg peak—to high-velocity ion stopping in well-characterized high-energy-density plasmas. These measurements were executed at electron temperatures and number densities in the range of 1.4–2.8 keV and 4×10^{23}–8×10^{23} cm^{−3}, respectively. For these conditions, it is experimentally demonstrated that the Brown-Preston-Singleton formalism provides a better description of the ion stopping than other formalisms around the Bragg peak, except for the ion stopping at v_{i}∼0.3v_{th}, where the Brown-Preston-Singleton formalism significantly underpredicts the observation. It is postulated that the inclusion of nuclear-elastic scattering, and possibly coupled modes of the plasma ions, in the modeling of the ion-ion interaction may explain the discrepancy of ∼20% at this velocity, which would have an impact on our understanding of the alpha energy deposition and heating of the fuel ions, and thus reduce the ignition threshold in an ignition experiment. ©2019, U.S. DOE (grant no. DE-NA0002949)

Published
2020

42. A second order yield-temperature relation for accurate inference of burn-averaged quantities in multi-species plasmas

Author

Kabadi, N. V., primary, Adrian, P. J., additional, Bose, A., additional, Casey, D. T., additional, Frenje, J. A., additional, Gatu Johnson, M., additional, Lahmann, B., additional, Mannion, O. M., additional, Petrasso, R. D., additional, Rinderknecht, H. G., additional, Séguin, F. H., additional, Sio, H. W., additional, Sutcliffe, G. D., additional, and Zylstra, A. B., additional

Published
2021
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43. A multi-channel x-ray temporal diagnostic for measurement of time-resolved electron temperature in cryogenic deuterium–tritium implosions at OMEGA

Author

Kabadi, N., primary, Sorce, A., additional, Stoeckl, C., additional, Sio, H. W., additional, Adrian, P., additional, Bedzyk, M., additional, Frenje, J., additional, Katz, J., additional, Knauer, J., additional, Pearcy, J., additional, Weiner, D., additional, Aguirre, B. A., additional, Betti, R., additional, Birkel, A., additional, Cao, D., additional, Gatu Johnson, M., additional, Patel, D., additional, Petrasso, R. D., additional, and Regan, S. P., additional

Published
2021
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44. Optimized continuum x-ray emission from laser-generated plasma

Author

Krygier, A., primary, Kemp, G. E., additional, Coppari, F., additional, Thorn, D. B., additional, Bradley, D., additional, Do, A., additional, Eggert, J. H., additional, Hsing, W., additional, Khan, S. F., additional, Krauland, C., additional, Landen, O. L., additional, MacDonald, M. J., additional, McNaney, J. M., additional, Park, H.-S., additional, Remington, B. A., additional, Rubery, M., additional, Schneider, M. B., additional, Sio, H., additional, and Ping, Y., additional

Published
2020
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45. Magnetized ICF implosions: Scaling of temperature and yield enhancement.

Author

Walsh, C. A., O'Neill, S., Chittenden, J. P., Crilly, A. J., Appelbe, B., Strozzi, D. J., Ho, D., Sio, H., Pollock, B., Divol, L., Hartouni, E., Rosen, M., Logan, B. G., and Moody, J. D.

Subjects
INERTIAL confinement fusion, MAGNETIC flux density, MAGNETIC fields, SURFACE area
Abstract

This paper investigates the impact of an applied magnetic field on the yield and hot-spot temperature of inertial confinement fusion implosions. A scaling of temperature amplification due to magnetization is shown to be in agreement with unperturbed two-dimensional (2D) extended-magnetohydrodynamic simulations. A perfectly spherical hot-spot with an axial magnetic field is predicted to have a maximum temperature amplification of 37%. However, elongation of the hot-spot along field lines raises this value by decreasing the hot-spot surface area along magnetic field lines. A scaling for yield amplification predicts that a magnetic field has the greatest benefit for low-temperature implosions; this is in agreement with simplified 1D simulations, but not 2D simulations where the hot-spot pressure can be significantly reduced by heat-flow anisotropy. Simulations including a P2 drive asymmetry then show that the magnetized yield is a maximum when the capsule drive corrects the hot-spot shape to be round at neutron bang time. An applied magnetic field is also found to be most beneficial for implosions that are more highly perturbed, exceeding the theoretical yield enhancement for symmetric hot-spots. Increasing the magnetic field strength past the value required to magnetize the electrons is beneficial due to the additional suppression of perturbations by magnetic tension. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Transient magnetic field diffusion considerations relevant to magnetically assisted indirect drive inertial confinement fusion

Author

Moody, J. D., primary, Johnson, A., additional, Javedani, J., additional, Carroll, E., additional, Fry, J., additional, Kozioziemski, B., additional, Kucheyev, S. O., additional, Logan, B. G., additional, Pollock, B. B., additional, Sio, H., additional, Strozzi, D., additional, Stygar, W. A., additional, Tang, V., additional, and Winters, S., additional

Published
2020
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47. Saturn-ring proton backlighters for the National Ignition Facility

Author

Zylstra, A. B., primary, Craxton, R. S., additional, Rygg, J. R., additional, Li, C.-K., additional, Carlson, L., additional, Manuel, M. J.-E., additional, Alfonso, E. L., additional, Mauldin, M., additional, Gonzalez, L., additional, Youngblood, K., additional, Garcia, E. M., additional, Browning, L. T., additional, Le Pape, S., additional, Lemos, N. Candeias, additional, Lahmann, B., additional, Gatu Johnson, M., additional, Sio, H., additional, and Kabadi, N., additional

Published
2020
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49. Quantifying carrier recombination at grain boundaries in multicrystalline silicon wafers through photoluminescence imaging.

Author

Sio, H. C., Trupke, T., and Macdonald, D.

Subjects
*PHOTOLUMINESCENCE, *KIRKENDALL effect, *SELF-diffusion (Solid state physics), *DIFFUSION barriers, *HYDROGENATION
Abstract

We present a method based on steady state photoluminescence (PL) imaging and modelling of the PL intensity profile across a grain boundary (GB) using 2D finite element analysis, to quantify the recombination strength of a GB in terms of the effective surface recombination velocity (Seff). This quantity is a more meaningful and absolute measure of the recombination activity of a GB compared to the commonly used signal contrast, which can strongly depend on other sample parameters, such as the intra-grain bulk lifetime. The method also allows the injection dependence of the Seff of a given GB to be explicitly determined. The method is particularly useful for studying the responses of GBs to different cell processing steps, such as phosphorus gettering and hydrogenation. The method is demonstrated on double-side passivated multicrystalline wafers, both before and after gettering, and single-side passivated wafers with a strongly non-uniform carrier density profile depth-wise. Good agreement is found between the measured PL profile and the simulated PL profile for both cases. We demonstrate that single-side passivated wafers allow more recombination active grain boundaries to be analysed with less unwanted influence from nearby features. The sensitivity limits and other practical constraints of the method are also discussed. [ABSTRACT FROM AUTHOR]

Published
2014
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50. Experimental Evidence of a Variant Neutron Spectrum from the $T(t,2n)\alpha$ Reaction at Center-of-Mass Energies in the Range of 16--50 keV

Author

Gatu Johnson, M., Forrest, C.J., Sayre, D.B., Bacher, A., Bourgade, J.L., Brune, C.R., Caggiano, J.A., Casey, D.T., Frenje, J.A., Glebov, V.Yu., Hale, G.M., Hatarik, R., Herrmann, H.W., Janezic, R., Kim, Y.H., Knauer, J.P., Landoas, O., McNabb, D.P., Paris, M.W., Petrasso, R.D., Pino, J.E., Quaglioni, S., Rosse, B., Sanchez, J., Sangster, T.C., Sio, H., Shmayda, W., Stoeckl, C., Thompson, I., Zylstra, A.B., Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Full calculations of six-nucleon reactions with a three-body final state have been elusive and a long-standing issue. We present neutron spectra from the T(t,2n)α (TT) reaction measured in inertial confinement fusion experiments at the OMEGA laser facility at ion temperatures from 4 to 18 keV, corresponding to center-of-mass energies (Ec.m.) from 16 to 50 keV. A clear difference in the shape of the TT-neutron spectrum is observed between the two Ec.m., with the He5 ground state resonant peak at 8.6 MeV being significantly stronger at the higher than at the lower energy. The data provide the first conclusive evidence of a variant TT-neutron spectrum in this Ec.m. range. In contrast to earlier available data, this indicates a reaction mechanism that must involve resonances and/or higher angular momenta than L=0. This finding provides an important experimental constraint on theoretical efforts that explore this and complementary six-nucleon systems, such as the solar He3(He3,2p)α reaction.

Published
2018

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