Measurements of free-free absorption in warm dense aluminium

C Hyland; S White; B Kettle; R Irwin; David Bailie; M Yeung; G WIlliams; R Heathcote; I East; C. Spindloe; M Notley; D Riley

doi:10.1088/1361-6587/ac0353

Measurements of free-free absorption in warm dense aluminium

C Hyland^*, S White, B Kettle, R Irwin, David Bailie, M Yeung, G WIlliams, R Heathcote, I East, C. Spindloe, M Notley, D Riley

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were compared to results from the literature, where the measured attenuation coefficients showed some consistency with the modelling and existing data from a previous experiment. The absolute values of the attenuation coefficient were found to reside between the different sets of models for the warm dense matter (WDM) attenuation coefficient, and were found to be more in line with modelling and measurements of the cold opacity from the literature. Novel measurements of the real refractive index of WDM were also achieved—while ambiguity makes these measurements consistent with all the models, they prove useful as a proof-of-concept for future WDM studies.

Original language	English
Article number	074003
Number of pages	11
Journal	Plasma Physics and Controlled Fusion
Volume	63
Issue number	7
DOIs	https://doi.org/10.1088/1361-6587/ac0353
Publication status	Published - 04 Jun 2021

Keywords

XUV
DIFFRACTION
Warm Dense Matter
XUV Spectroscopy
High Harmonic Generation
Free-Free Absorption
Inverse Bremsstrahlung Absorption

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10.1088/1361-6587/ac0353Licence: CC BY

Measurements of free-free absorption in warm dense aluminium
Copyright 2021 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 1.44 MBLicence: CC BY

Electronic structure of warm dense matter
Author: Bailie, D., Jul 2022
Supervisor: Riley, D. (Supervisor) & Sarri, G. (Supervisor)
Student thesis: Doctoral Thesis › Doctor of Philosophy

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XUV probing of warm dense matter
Author: Hyland, C., Jul 2021
Supervisor: Riley, D. (Supervisor) & Borghesi, M. (Supervisor)
Student thesis: Doctoral Thesis › Doctor of Philosophy

File

Cite this

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title = "Measurements of free-free absorption in warm dense aluminium",

abstract = "Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were compared to results from the literature, where the measured attenuation coefficients showed some consistency with the modelling and existing data from a previous experiment. The absolute values of the attenuation coefficient were found to reside between the different sets of models for the warm dense matter (WDM) attenuation coefficient, and were found to be more in line with modelling and measurements of the cold opacity from the literature. Novel measurements of the real refractive index of WDM were also achieved—while ambiguity makes these measurements consistent with all the models, they prove useful as a proof-of-concept for future WDM studies.",

keywords = "XUV, DIFFRACTION, Warm Dense Matter, XUV Spectroscopy, High Harmonic Generation, Free-Free Absorption, Inverse Bremsstrahlung Absorption",

author = "C Hyland and S White and B Kettle and R Irwin and David Bailie and M Yeung and G WIlliams and R Heathcote and I East and C. Spindloe and M Notley and D Riley",

year = "2021",

month = jun,

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doi = "10.1088/1361-6587/ac0353",

language = "English",

volume = "63",

journal = "Plasma Physics and Controlled Fusion",

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TY - JOUR

T1 - Measurements of free-free absorption in warm dense aluminium

AU - Hyland, C

AU - White, S

AU - Kettle, B

AU - Irwin, R

AU - Bailie, David

AU - Yeung, M

AU - WIlliams, G

AU - Heathcote, R

AU - East, I

AU - Spindloe, C.

AU - Notley, M

AU - Riley, D

PY - 2021/6/4

Y1 - 2021/6/4

N2 - Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were compared to results from the literature, where the measured attenuation coefficients showed some consistency with the modelling and existing data from a previous experiment. The absolute values of the attenuation coefficient were found to reside between the different sets of models for the warm dense matter (WDM) attenuation coefficient, and were found to be more in line with modelling and measurements of the cold opacity from the literature. Novel measurements of the real refractive index of WDM were also achieved—while ambiguity makes these measurements consistent with all the models, they prove useful as a proof-of-concept for future WDM studies.

AB - Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were compared to results from the literature, where the measured attenuation coefficients showed some consistency with the modelling and existing data from a previous experiment. The absolute values of the attenuation coefficient were found to reside between the different sets of models for the warm dense matter (WDM) attenuation coefficient, and were found to be more in line with modelling and measurements of the cold opacity from the literature. Novel measurements of the real refractive index of WDM were also achieved—while ambiguity makes these measurements consistent with all the models, they prove useful as a proof-of-concept for future WDM studies.

KW - XUV

KW - DIFFRACTION

KW - Warm Dense Matter

KW - XUV Spectroscopy

KW - High Harmonic Generation

KW - Free-Free Absorption

KW - Inverse Bremsstrahlung Absorption

U2 - 10.1088/1361-6587/ac0353

DO - 10.1088/1361-6587/ac0353

M3 - Article

VL - 63

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 7

M1 - 074003

ER -

Measurements of free-free absorption in warm dense aluminium

Abstract

Keywords

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Student theses

Electronic structure of warm dense matter

XUV probing of warm dense matter

Cite this