Negative pressure and spallation in graphite targets under nano- and picosecond laser irradiation

Journal Article · Sun May 31 04:00:00 EDT 2015 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2015V045N05ABEH015759· OSTI ID:22551250

Belikov, R S; Khishchenko, K V ^[1]; Krasyuk, I K; Semenov, A Yu; Stuchebryukhov, I A ^[2]; Rinecker, T; Schoenlein, A ^[3]; Rosmej, O N ^[4]; Tomut, M ^[5]

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1. Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow (Russian Federation)
2. A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
3. Goethe University Frankfurt am Main (Germany)
4. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany, 64291 Darmstadt, Planckstraße, 1 (Germany)
5. Technische Universität Darmstadt, Germany, 64289 Darmstadt, Karolinenplatz, 5 (Germany)

We present the results of experiments on the spallation phenomena in graphite targets under shock-wave nano- and picosecond irradiation, which have been performed on Kamerton-T (GPI, Moscow, Russia) and PHELIX (GSI, Darmstadt, Germany) laser facilities. In the range of the strain rates of 10{sup 6} – 10{sup 7} s{sup -1}, the data on the dynamic mechanical strength of the material at rapure (spallation) have been for the first time obtained. With a maximal strain rate of 1.4 × 10{sup 7} s{sup -1}, the spall strength of 2.1 GPa is obtained, which constitutes 64% of the theoretical ultimate tensile strength of graphite. The effect of spallation is observed not only on the rear side of the target, but also on its irradiated (front) surface. With the use of optical and scanning electron microscopes, the morphology of the front and rear surfaces of the targets is studied. By means of Raman scattering of light, the graphite structure both on the target front surface under laser exposure and on its rear side in the spall zone is investigated. A comparison of the dynamic strength of graphite and synthetic diamond is performed. (extreme light fields and their applications)

• OSTI ID: 22551250
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 5 Vol. 45; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIAMONDS
GRAPHITE
IRRADIATION
LASER RADIATION
MORPHOLOGY
PRESSURE RANGE GIGA PA
RAMAN EFFECT
SCANNING ELECTRON MICROSCOPY
SHOCK WAVES
SPALLATION
STRAIN RATE
SURFACES
TENSILE PROPERTIES
VISIBLE RADIATION