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Adiabatic Index in Shock‐Compressed Beryllium
Author(s) -
Fortmann C.,
Lee H. J.,
Döppner T.,
Falcone R. W.,
Kritcher A. L.,
Landen O. L.,
Niemann C.,
Glenzer S. H.
Publication year - 2012
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201100101
Subject(s) - adiabatic process , shock (circulatory) , physics , measure (data warehouse) , beryllium , shock wave , compression (physics) , equation of state , scaling , mechanics , thermodynamics , nuclear physics , medicine , geometry , mathematics , database , computer science
We present a method to measure the adiabatic index of a material under shock compression by X‐ray Thomson Scattering. A beryllium target is symmetrically compressed by two counterpropagating shock waves that collide in the target center, producing super dense states of matter of up to 6 fold compression. We measure the density before and after the shock collision and solve the Hugoniot relations for colliding shocks to infer the adiabatic index. Our results indicate that the adiabatic index stays rather high even in the high compression regime. This agrees with a linear scaling model taken from the SESAME equation of state and shows that the adiabatic index becomes significantly different from the ratio of heat capacities in this strongly coupled plasma (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)