Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session Y04: High Energy Density ScienceRecordings Available
|
Hide Abstracts |
Chair: Arianna Gleason, SLAC - Natl Accelerator Lab Room: Anaheim Marriott Platinum 2 |
Friday, July 15, 2022 9:15AM - 9:30AM |
Y04.00001: The development of shock pressure in direct laser ablation of Au Noaz Nissim, Eran Greenberg, Meir Werdiger, Yossef Horowitz, Benny Glam, Lior Perelmutter, Yair Ferber, Lior Bakshi, Inon Moshe, Galit Strum, Shalom Eliezer This work presents high-intensity laser direct ablation experiments on Au foil samples of 10-40 μm thickness, during which the average shock and free surface velocities were measured using a modified PDV diagnostic [1]. For laser intensities of 4x1012 - 1014 W/cm2, the shock pressure was estimated to be at 2.2 – 10.3 Mbar, respectively. A clear measurement of the free surface velocity for up to about 2 ns from shock breakout, combined with the average shock velocity measurement, shows that for short times after the beginning of the ablation process, the pressure wave propagates with a velocity much higher than the roughly steady shockwave pressure that stabilizes at later times. This effect manifests as large deviations from the material’s us-up EOS for thin targets in such irradiation setup. |
Friday, July 15, 2022 9:30AM - 9:45AM |
Y04.00002: Experimental studies of material strength of metals with artificially implanted helium bubbles in the high energy density regime Hye-Sook Park, Nathan R Barton, Yong-Jae Kim, Tom Lockard, Bruce A Remington, Robert E Rudd, Philip D Powell, Camelia V Stan, Damian C Swift, Alex B Zylstra, James M McNaney Plasma-driven ramp compression is a powerful means of studying materials at high-pressure conditions without melting. Understanding plastic deformation dynamics of materials under extreme conditions is of high interest to a number of fields, including meteor impact dynamics and advanced inertial confinement fusion. We infer the strength of samples at pressures up to 8 Mbar, strain rates of ~107 s-1, and high strains > 30% by measuring the growth of Rayleigh-Taylor instabilities (RTI) under ramped compression. We are now studying the dynamic response of materials that are aged by the radioactive alpha decay process. We fabricated lead samples that were artificially implanted with helium bubbles to mimic the effects of alpha decay. We conducted side-by-side comparisons of pure versus helium-doped lead samples using the NIF laser facility. Initial results from these experiments will be presented. |
Friday, July 15, 2022 9:45AM - 10:00AM |
Y04.00003: X-Ray Diffraction of Shocked Platinum Mary Kate Ginnane, Amy E Lazicki, Richard G Kraus, Xuchen Gong, Danae Polsin, Chad A McCoy, Christopher T Seagle, Jean-Paul Davis, Seth Root, Michelle C Marshall, Brian Henderson, Linda E Hansen, Zaire Sprowal, Alexa LaPierre, Margaret F Huff, Jon H Eggert, Dayne E Fratanduono, Tom Boehly, J. Ryan Rygg, Gilbert W Collins Platinum is often used as a pressure calibrant in diamond-anvil cell experiments, where it is routinely compressed to high pressure–temperature states. Previous experiments have observed the face-centered cubic (fcc) phase of platinum up to 383 GPa.[1] Laser-driven experiments at the University of Rochester’s Laboratory for Laser Energetics used the powder x-ray diffraction platform[2] on OMEGA EP to extend these measurements for shock and shock-ramped platinum up to 500 GPa. The fcc phase remained stable upon compression until liquid diffraction was observed. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856. [1] S. M. Sharma et al., Phys. Rev. Lett. 124, 235701 (2020).
[2] J. R. Rygg et al., Rev. Sci. Instrum. 83, 113904 (2012).
|
Friday, July 15, 2022 10:00AM - 10:15AM |
Y04.00004: Principal Hugoniot, reshock, and temperature measurements in liquid neon at multi-megabar pressures Chad A McCoy, Kyle R Cochrane, Seth Root Constraining material properties at extreme conditions is necessary to understand astrophysical processes and stellar structures. Neon is the fifth most prevalent element in the universe and plays a significant role in energy transfer and internal structures for stars greater than ten solar masses. Additionally, it is a difficult material for density functional theory (DFT) and path-integral Monte Carlo studies due to its large bandgap which persists to extreme conditions. We present measurements of the principal Hugoniot and reshock of liquid neon at pressures up to 5 megabar on the OMEGA laser at the University of Rochester's Laboratory for Laser Energetics and the Z machine at Sandia National Laboratories. We determined the temperature along the Hugoniot using the decaying shock technique. For comparison, we conducted DFT-based molecular dynamics simulations on the principal Hugoniot. The experimental results and DFT calculations agree well, validating the theoretical methods in this regime. |
Friday, July 15, 2022 10:15AM - 10:30AM |
Y04.00005: Shock-Wave Properties in High-Energy-Density Environments Ethan Smith, Ryan Rygg, Gilbert Collins, John J Ruby Spherical implosions of thin-shell targets at the Omega Laser Facility provide a platform to study materials at gigabar pressures and shock dynamics relevant to supernova remnants. A laser-driven spherical shock is launched in the target, which rebounds upon reaching the center and interacts with the surrounding plasma of ablated shell material, forming an expanding shell of hot, shocked material similar to those found around supernova remnants. Measurements of the x-ray continuum radiation emitted by this shell, along with a simplified model of the shock dynamics inspired by efforts to model the propagation and phases of supernova remnants, are used to constrain the thermodynamic states of the shocked material inside the shell using Bayesian inference. |
Friday, July 15, 2022 10:30AM - 10:45AM |
Y04.00006: High Energy Density Physics at the Next Generation Pulsed Power Facility Thomas R Mattsson, Justin L Brown, Jean-Paul Davis, Jonathan D Douglass, Brian T Hutsel, Kyle J Peterson Sandia’s Z facility’s unique capabilities to deliver thermophysical data with high accuracy for dynamic compression of matter has over the last twenty years led to a number of scientific discoveries across multiple fields. In this talk, we will present plans for the Next Generation Pulsed Power (NGPP) Facility as well as designs of the first experiments planned for NGPP in the area of high-pressure material physics. We conclude that NGPP will allow for high-accuracy data for shock-less compression of solids well above 1000 GPa (10 Mbar). |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700