Observation of Nonlocal Heat Flux Using Thomson Scattering

Henchen, R.J.; Sherlock, M.; Rozmus, W.; Katz, J.; Cao, D.; Palastro, J. P.; Froula, D. H.

doi:10.1103/physrevlett.121.125001

Cited by 42 publications

(20 citation statements)

References 37 publications

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“…In the case of the high Z plasma (Z = 116), AWBS exactly aligns with the Lorentz gas limit (20). In the opposite case of the low Z Hydrogen plasma (Z = 1), the AWBS distribution function approaches closely the numerical SH solution (17). BGK ( 22) takes the Lorentz gas distribution function for any Z only scaled by ξ.…”

Section: Summary Of the Bgk Awbs And Fokker-planck Local Diffusive Tr...mentioning

confidence: 65%

“…More simple linear forms of e-e collision operator are needed. Although some VFP simulations on experimentally relevant timescales have been performed (for recent examples see [11][12][13][14][15][16][17], an extensive review has been conducted by Thomas et al [18]), their relative computational inefficiency severely limits the range of simulations that can be performed.…”

Section: Introductionmentioning

confidence: 99%

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AWBS kinetic modeling of electrons with nonlocal Ohms law in plasmas relevant to inertial confinement fusion

Holec,

Loiseau,

Debayle

et al. 2019

Preprint

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The interaction of lasers with plasmas very often leads to nonlocal transport conditions, where the classical hydrodynamic model fails to describe important microscopic physics related to highly mobile particles. In this study we analyze and further propose a modification of the Albritton-Williams-Bernstein-Swartz collision operator Phys. Rev. Lett 57, 1887Lett 57, (1986 for the nonlocal electron transport under conditions relevant to ICF. The electron distribution function provided by this modification exhibits some very desirable properties when compared to the full Fokker-Planck operator in the local diffusive regime, and also performs very well when benchmarked against Vlasov-Fokker-Planck and collisional PIC codes in the nonlocal transport regime, where we find that the effect of the electric field via the nonlocal Ohm's law is an essential ingredient in order to capture the electron kinetics properly.

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Section: Summary Of the Bgk Awbs And Fokker-planck Local Diffusive Tr...mentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

AWBS kinetic modeling of electrons with nonlocal Ohms law in plasmas relevant to inertial confinement fusion

Holec,

Loiseau,

Debayle

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…In a modern experiment of optical Thomson scattering 1 off laser-produced plasmas, scattered light waves are usually collected and relayed into a grating spectrometer coupled with a streak camera [2][3][4][5][6][7][8][9] . With this kind of experimental setup, time-resolved scattering spectra are obtained.…”

mentioning

confidence: 99%

The meaning of time-resolved Thomson scattering spectrum output from a grating spectrometer

Zheng

Liu

2020

AIP Advances

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Time-resolved spectra are often recorded in optical Thomson scattering experiments of laser-produced plasmas. In this article, the meaning of time-resolved spectrum output from a grating spectrometer is examined. Our results show that the recorded signal is indeed a convolution of the response function of the dispersion element and the product of the instant local dynamic form factor and electron density when the plasma evolves slowly; the plasma varies very little in the time duration of the scattering light passing through the scattering volume.

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“…1 As large multibeam facilities are constructed to achieve inertial confinement fusion around the world, [2][3][4] accurate measurements of plasma conditions are becoming increasingly important for understanding the importance of missing physics in the large hydrodynamic simulations. Local and time-resolved measurements of Thomson-scattered spectra have provided valuable insight into a range of studies, including laser-plasma instabilities, 2 thermal transport, 5 and more generally inertial confinement fusion. 6,7 The high density present in laser-produced plasmas results in scattering optical light from collective plasma-wave fluctuations.…”

mentioning

confidence: 99%

Impact of non-Maxwellian electron velocity distribution functions on inferred plasma parameters in collective Thomson scattering

et al. 2019

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Optical collective Thomson scattering provides precise density and temperature measurements in numerous plasma-physics experiments. The accuracy of such measurements depends on the core assumption that the underlying electron distribution functions in under-dense laser-produced plasmas are Maxwellian. A statistically based, quantitative analysis of the errors in the measured electron density and temperature is presented when synthetic data calculated using a non-Maxwellian electron distribution function is fit assuming a Maxwellian electron distribution. Such analysis can lead to errors of up to 50% in temperature and 30% in density, in the specific case of super-Gaussian distributions characteristic of inverse bremsstrahlung heating. Including the proper family of non-Maxwellian electron distribution functions, as a fitting parameter, in Thomson-scattering analysis removes the model-dependent errors in the inferred parameters at a minimal cost to the statistical uncertainty.

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Observation of Nonlocal Heat Flux Using Thomson Scattering

Cited by 42 publications

References 37 publications

AWBS kinetic modeling of electrons with nonlocal Ohms law in plasmas relevant to inertial confinement fusion

AWBS kinetic modeling of electrons with nonlocal Ohms law in plasmas relevant to inertial confinement fusion

The meaning of time-resolved Thomson scattering spectrum output from a grating spectrometer

Impact of non-Maxwellian electron velocity distribution functions on inferred plasma parameters in collective Thomson scattering

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