Progress in the study of warm dense matter

Kœnig, M.; Benuzzi‐Mounaix, A.; Ravasio, A.; Vinci, T.; Ozaki, Norimasa; LePape, S.; Batani, D.; Hüser, G.; Hall, Tom; Hicks, D. G.; Mackinnon, A. J.; Patel, P. K.; Park, H S; Boehly, T. R.; Borghesi, M.; Kar, S.; Romagnani, L.

doi:10.1088/0741-3335/47/12b/s31

Cited by 135 publications

(86 citation statements)

References 28 publications

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“…Depending on the laser flux, the photo-excited sample can reach the liquid phase (ultrafast melting [2]) or more exotic states, such as, e.g., the warm dense matter [3] or the dense plasma phase [4], where the kinetic energy of the photo-excited free electrons compares or exceeds the potential energy of ion-electron interactions. In almost all cases, laser-driven excited states are characterized by short lifetimes, typically ranging from sub-ps to a few ps.…”

Section: Introductionmentioning

confidence: 99%

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

et al. 2017

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Time resolved extreme ultraviolet (EUV) transient reflectivity measurements on non-equilibrium amorphous carbon (a-C) have been carried out by combining optical and free electron laser (FEL) sources. The EUV probing was specifically sensitive to lattice dynamics, since the EUV reflectivity is essentially unaffected by the photo-excited surface plasma. Data have been interpreted in terms of the dynamics of an expanding surface, i.e., a density gradient rapidly forming along the normal surface. This allowed us to determine the characteristic time (τ 1 ps) for hydrodynamic expansion in photo-excited a-C. This finding suggests an extremely narrow time window during which the system can be assumed to be in the isochoric regime, a situation that may complicate the study of photo-induced metastable phases of carbon. Data also showed a weak dependence on the probing EUV wavelength, which was used to estimate the electronic temperature (T e ≈ 0.8 eV) of the excited sample. This experimental finding compares fairly well with the results of calculations, while a comparison of our data and calculations with previous transient optical reflectivity measurements highlights the complementarities between optical and EUV probing.

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Section: Introductionmentioning

confidence: 99%

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

et al. 2017

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“…High-energy [1] and x-ray free-electron lasers [2] are now able to produce matter in extreme states, such as found throughout the universe in planetary interiors [3], brown dwarfs stars, and neutron star crusts [4]. This high pressure (> 1 Mbar), high temperature (> 1 eV) regime, containing matter compressed up to a few times ambient density is also multi-ionized and of technological interest for inertial confinement fusion studies [5].…”

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confidence: 99%

Evidence for out-of-equilibrium states in warm dense matter probed by x-ray Thomson scattering

et al. 2015

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A recent and unexpected discrepancy between ab initio simulations and the interpretation of a laser shock experiment on aluminum, probed by X-ray Thomson scattering (XRTS), is addressed.The ion-ion structure factor deduced from the XRTS elastic peak (ion feature) is only compatible with a strongly coupled out-of-equilibrium state. Orbital free molecular dynamics simulations with ions colder than the electrons are employed to interpret the experiment. The relevance of decoupled temperatures for ions and electrons is discussed. The possibility that it mimics a transient, or metastable, out-of-equilibrium state after melting is also suggested.

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“…Recent technical advances, experimental capabilities and facilities make it possible to create and confine of warm dense states of matter in the laboratory [2] and advanced diagnostics required for the characterization and interrogation of such states [3]. These experimental capabilities include radiation-synchrotron sources [4], energetic materials [5][6][7][8], high power lasers [9][10][11][12][13][14][15][16], particle beams [17,18], Z-pinch devices [19][20][21][22][23], and mechanical impact techniques such as utilized in gas-gun launchers [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics and Production of Warm Dense Matter with Multishock Reverberation Compression Technique

Chen¹

2017

J Apl Theol

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Multishock reverberation compression is an effective means, especially for low Z matter, to create high pressure warm dense states and study material properties under these extreme conditions. To character and interrogate of such state, we have developed a comprehensive diagnostic technique, which was used to determine the multishock compressed states and to obtain the equations of state of warm dense matter (WDM) pressure up to Mbar region. The results are used to validate the existing WDM theoretical model and create new theoretical ones.

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Progress in the study of warm dense matter

Cited by 135 publications

References 28 publications

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

Transient EUV Reflectivity Measurements of Carbon upon Ultrafast Laser Heating

Evidence for out-of-equilibrium states in warm dense matter probed by x-ray Thomson scattering

Diagnostics and Production of Warm Dense Matter with Multishock Reverberation Compression Technique

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