Idealized slab plasma approach for the study of warm dense 
matter

Ng, A.; Ao, T.; Perrot, F.; Dharma‐wardana, M. W. C.; Foord, M. E.

doi:10.1017/s0263034605050718

Cited by 55 publications

(31 citation statements)

References 30 publications

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“…Such fields can play an important role in the plasma evolution, which are related to various applications, including plasma-based advanced particle acceleration (1-5), inertial confinement fusion (6), high energy density physics (7), astrophysical phenomena (8), as well as shock physics (9). Because of the difficulties in experimental measurements of the fields, however, they have been studied so far mostly through theoretical models and numerical simulations.…”

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confidence: 99%

Mapping transient electric fields with picosecond electron bunches

Chen

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Transient electric fields, which are an important but hardly explored parameter of laser plasmas, can now be diagnosed experimentally with combined ultrafast temporal resolution and field sensitivity, using femtosecond to picosecond electron or proton pulses as probes. However, poor spatial resolution poses great challenges to simultaneously recording both the global and local field features. Here, we present a direct 3D measurement of a transient electric field by time-resolved electron schlieren radiography with simultaneous 80-μm spatial and 3.7-ps temporal resolutions, analyzed using an Abel inversion algorithm. The electric field here is built up at the front of an aluminum foil irradiated with a femtosecond laser pulse at 1.9 × 1012 W/cm2, where electrons are emitted at a speed of 4 × 106 m/s, resulting in a unique “peak–valley” transient electric field map with the field strength up to 105 V/m. Furthermore, time-resolved schlieren radiography with charged particle pulses should enable the mapping of various fast-evolving field structures including those found in plasma-based particle accelerators.

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confidence: 99%

Mapping transient electric fields with picosecond electron bunches

Chen

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…The incident angle of the back probe was w45. 5 different from the front side to avoid interference with the transmitted front probe. The 0.5 difference in the incident angles has a negligible effect on the data analysis.…”

Section: Methodsmentioning

confidence: 99%

Ballistic electron transport in non-equilibrium warm dense gold

Ogitsu

Ping

Correa

et al. 2012

High Energy Density Physics

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“…Warm dense matter can be produced by several heating technologies including lasers, pulsed electric current, electron, ion and x-ray beam heating, shock-wave heating, etc (DOE, 2009;Hoffmann et al 2005;Sasaki et al 2006;Ng et al 2005; Lee et al 1998). Temperature measurements are essential to WDM science.…”

Section: Introductionmentioning

confidence: 99%

Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery

Bieniosek

2013

Laser Part. Beams

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This paper examines the reliability of a widely used method for temperature determination by multi-wavelength pyrometry. In recent WDM experiments with ionbeam heated metal foils, we found that the statistical quality of the fit to the measured data is not necessarily a measure of the accuracy of the inferred temperature. We found a specific example where a second-best fit leads to a more realistic temperature value. The physics issue is the wavelength-dependent emissivity of the hot surface. We discuss improvements of the multi-frequency pyrometry technique, which will give a more reliable determination of the temperature from emission data.Keywords: warm dense matter, temperature measurement, pyrometry, heavy ion beam heating. IntroductionWarm dense matter can be produced by several heating technologies including lasers, pulsed electric current, electron, ion and x-ray beam heating, shock-wave heating, etc (DOE, 2009;Hoffmann et al. 2005;Sasaki et al. 2006;Ng et al. 2005; Lee et al. 1998). Temperature measurements are essential to WDM science. In most cases the deposited energy is determined accurately but at present there is no universal method to directly measure the temperature. As a consequence, the specific heat C = dE/dT is not accurately determined and this is a key unknown aspect of the equation of state (EOS). There is also a class of experiments, which aims to study phase transitions: these may be high-temperature evaporation of refractory metals, a liquid-vapor critical point, or an abrupt change of electronic structure (metal-insulator transition). Such transitions typically occur at definite temperatures and an accurate measurement of the transition temperature is obviously a key step for building up the quantitative science of warm dense matter. Today the critical points of refractory metals are uncertain to something like 50 % and this uncertainty is a leading source of EOS uncertainty for WDM expanded below solid density. At higher energy-density (HEDP), shock Hugoniot measurements can accurately determine for the material density, energy-density and pressure, but different EOS models predict different temperatures for the same (energy/pressure/density) shocked conditions, so again temperature is a key uncertainty for HEDP EOS data. Finally, almost all the computer codes used to predict the properties of warm dense matter (or hotter plasmas) use density and temperature as inputs and for this reason it will be easier to directly compare theory and experiment if one can accurately measure the temperatures attained in any given experiment.

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Idealized slab plasma approach for the study of warm dense matter

Cited by 55 publications

References 30 publications

Mapping transient electric fields with picosecond electron bunches

Mapping transient electric fields with picosecond electron bunches

Ballistic electron transport in non-equilibrium warm dense gold

Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery

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