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Title: Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

Journal Article · · Physical Review E

Cu foils, 200 μm in thickness, were heated in two stages by a ~100-ns-long monoenergetic electron bunch at 19.8 MeV and a current of 1.7 kA (8.5 × 1014 e-) in a 2-mm-spot to Te ~1 eV. After 45 ns of isochoric heating, the pressure in the foil builds up to >20 GPa (200 kbar), it begins to hydrodynamically disassemble, and a velocity spread is measured. Near the end of the electron pulse, the 1550 nm probe is cut off or absorbed. Photonic Doppler velocimetry measurements were made to quantify the expansion velocity, hydrodynamic disassembly time, and pressure of the foil prior to cutoff. Measurements indicate foil motion begins the instant electrons pass through the foil and continues until the particle velocity approaches the ambient sound velocity of Cu and the bulk density exceeds the critical density of the probe. Finally, once the density of the plasma drops below the critical threshold and begins reflecting again, an expansion velocity of the classical plasma is also measured, similar to the point-source solution.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396
OSTI ID:
1726157
Alternate ID(s):
OSTI ID: 1477539
Report Number(s):
LA-UR-18-21623; TRN: US2205069
Journal Information:
Physical Review E, Vol. 98, Issue 4; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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