Bulletin of the American Physical Society
17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 56, Number 6
Sunday–Friday, June 26–July 1 2011; Chicago, Illinois
Session U4: Experimental Developments V |
Hide Abstracts |
Chair: Katherine Prestridge, Los Alamos National Laboratory Room: Renaissance Ballroom C |
Thursday, June 30, 2011 2:00PM - 2:15PM |
U4.00001: Shock-Wave and Detonation Studies at ITEP-TWAC Proton Radiography Facility Sergey Kolesnikov, Sergey Dudin, Vladimir Lavrov, Dmitry Nikolaev, Victor Mintsev, Nikolay Shilkin, Vladimir Ternovoi, Alexander Utkin, Vladislav Yakushev, Denis Yuriev, Vladimir Fortov, Alexander Golubev, Alexey Kantsyrev, Lev Shestov, Gennady Smirnov, Vladimir Turtikov, Boris Sharkov, Vasily Burtsev, Nikolay Zavialov, Sergey Kartanov, Anatoly Mikhailov, Alexey Rudnev, Mikhail Tatsenko, Mikhail Zhernokletov In recent years studies of shock and detonation wave phenomena at extreme dynamic conditions were performed at proton radiography facility developed at the 800 MeV proton beam line of ITEP Terawatt Accelerator (ITEP-TWAC). The facility provides a multi-frame imaging capability at 50 $\mu $m spatial and 70 ns temporal resolution. The results of latest studies conducted there are presented, including explosion and detonation of pressed and emulsion high explosives, shock-induced dense non-ideal plasma of argon and xenon and shock loading of non-uniform metal surfaces. New compact explosive generators developed specifically for a use at proton radiography facilities are also presented. [Preview Abstract] |
Thursday, June 30, 2011 2:15PM - 2:30PM |
U4.00002: Transport of Particulate Matter from a Shocked Interface W.T. Buttler, J.E. Hammerberg, D. Oro, F. Mariam, C. Rousculp We have performed a series of shock experiments to measure the evolution and transport of micron and sub-micron Tungsten particles from a 40 $\mu$m thick layer deposited on an Aluminum substrate. Densities and velocity distributions were measured using proton radiography at the Los Alamos Neutron Science Center for vacuum conditions and with contained Argon and Xenon gas atmospheres at initial pressures of 9.5 bar and room temperature. A common shock drive resulted in free surface velocities of 1.25 km/s. An analysis of the time dependence of Lithium Niobate piezo-electric pin pressure profiles is given in terms of solutions to the particulate drag equations and the evolution equation for the particulate distribution function. The spatial and temporal fore-shortening in the shocked gas can be accounted for using reasonable values for the compressed gas shear viscosities and the vacuum distributions. The detailed form of the pin pressure data for Xenon indicates particulate breakup in the hot compressed gas. [Preview Abstract] |
Thursday, June 30, 2011 2:30PM - 3:00PM |
U4.00003: The ORTEGA experiment: A study of damage with radiography and velocimetry Invited Speaker: The ORTEGA experiment consisted of two identical samples of lead (4{\%} antimony) driven by small charges of high explosive (HE). Flash x-radiography formed the key measurement. A short pulse of x-rays ``froze'' the motion much like a flash camera system and thereby permitted examination of the instantaneous internal spatial density distribution of the rapidly moving material. Two radiographs were taken encompassing both samples in each image and separated in time by $\sim $4 microseconds to allow observation of the evolution of the samples. Over a longer period of time, the pressure loading of the lead was determined by measuring the velocity of the leading surface at six points on each sample. One of these points recorded velocity histories with the Velocity Interferometer System for Any Reflector (VISAR) diagnostic, while the other five were recorded with Photonic Doppler Velocimetry (PDV). Simultaneously, detonation symmetry in each package was monitored by electrical pins embedded in the HE. This presentation will review the experimental motivation, setup, and data, illustrating the reproducibility of shock measurements in HE-driven spall experiments by simultaneous measurement of two nominally-identical samples. Subsequent presentation will review pre-shot hydrocode calculations and will discuss the radiographic measurements in more detail. [Preview Abstract] |
Thursday, June 30, 2011 3:00PM - 3:15PM |
U4.00004: Preshot Calculations for the Ortega Experiment Nicholas Jenkins, Bruce Trent, Marvin Zocher, Michael Furlanetto Calculations for the Ortega experiment were preformed prior to the execution of the test in order to help establish experimental expectations and to aid in the setup of the radiographic and velocity diagnostics. A numerical model was developed from the fabrication schematics with necessary simplifications made in order to preserve numerical stability. Computations were performed with a LANL developed finite volume based Lagrangian hydrocode on a two-dimensional unstructured mesh. Current state of the art material strength and damage models were implemented with utilization of adaptive mesh refinement to perform extensive simulations on high speed computing platforms. Systematic numerical tests were completed to verify the validity of each simplifying assumption, and a final pre-shot quantitative prediction for velocimetry and material deformation was presented. The development of the model and the predictions are provided in this presentation. [Preview Abstract] |
Thursday, June 30, 2011 3:15PM - 3:30PM |
U4.00005: The ORTEGA experiment: Radiographic methods, analysis and results Todd Haines, Nick King, Steve Lutz, John Smith The ORTEGA experiment, executed on July 28$^{\rm th}$, 2010 by a team from Los Alamos, Sandia, National Security Technologies, and others, at the Nevada National Security Site, consisted of two identical samples of lead driven by small charges of HE. Flash x-radiography formed the key measurement. A short pulse of x-rays ``froze'' the motion much like a flash camera system and thereby permitted examination of the instantaneous internal spatial density distribution of the rapidly moving material. Two radiographs were taken encompassing both samples in each image and separated in time by $\sim $4 microseconds to allow observation of the evolution of the samples. This presentation will review the radiographic methodology, the data set, calibration and details of the analysis of the data. [Preview Abstract] |
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