Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser

M. Shahzad, O. Culfa, A. K. Rossall, L. A. Wilson, O. Guilbaud, S. Kazamias, O. Delmas, J. Demailly, A. Maitrallain, M. Pittman, E. Baynard, M. Farjardo, G. J. Tallents

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We demonstrate the use of extreme ultra-violet (EUV) laboratory lasers in probing energy transport in laser irradiated solid targets. EUV transmission through targets containing a thin layer of iron (50 nm) encased in plastic (CH) after irradiation by a short pulse (35 fs) laser focussed to irradiances 3 × 1016 Wcm-2 is measured. Heating of the iron layer gives rise to a rapid decrease in EUV opacity and an increase in the transmission of the 13.9 nm laser radiation as the iron ionizes to Fe5+ and above where the ion ionisation energy is greater than the EUV probe photon energy (89 eV). A one dimensional hydrodynamic fluid code HYADES has been used to simulate the temporal variation in EUV transmission (wavelength 13.9 nm) using IMP opacity values for the iron layer and the simulated transmissions are compared to measured transmission values. When a deliberate pre-pulse is used to preform an expanding plastic plasma, it is found that radiation is important in the heating of the iron layer while for pre-pulse free irradiation, radiation transport is not significant.

LanguageEnglish
Article number023301
JournalPhysics of Plasmas
Volume22
Issue number2
DOIs
Publication statusPublished - 1 Feb 2015
Externally publishedYes

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ultraviolet lasers
iron
opacity
plastics
pulses
IMP
energy
lasers
irradiation
heating
radiation transport
preforms
irradiance
hydrodynamics
laser beams
methylidyne
ionization
probes
fluids
photons

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Shahzad, M., Culfa, O., Rossall, A. K., Wilson, L. A., Guilbaud, O., Kazamias, S., ... Tallents, G. J. (2015). Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser. Physics of Plasmas, 22(2), [023301]. https://doi.org/10.1063/1.4913357
Shahzad, M. ; Culfa, O. ; Rossall, A. K. ; Wilson, L. A. ; Guilbaud, O. ; Kazamias, S. ; Delmas, O. ; Demailly, J. ; Maitrallain, A. ; Pittman, M. ; Baynard, E. ; Farjardo, M. ; Tallents, G. J. / Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser. In: Physics of Plasmas. 2015 ; Vol. 22, No. 2.
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Shahzad, M, Culfa, O, Rossall, AK, Wilson, LA, Guilbaud, O, Kazamias, S, Delmas, O, Demailly, J, Maitrallain, A, Pittman, M, Baynard, E, Farjardo, M & Tallents, GJ 2015, 'Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser', Physics of Plasmas, vol. 22, no. 2, 023301. https://doi.org/10.1063/1.4913357

Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser. / Shahzad, M.; Culfa, O.; Rossall, A. K.; Wilson, L. A.; Guilbaud, O.; Kazamias, S.; Delmas, O.; Demailly, J.; Maitrallain, A.; Pittman, M.; Baynard, E.; Farjardo, M.; Tallents, G. J.

In: Physics of Plasmas, Vol. 22, No. 2, 023301, 01.02.2015.

Research output: Contribution to journalArticle

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T1 - Diagnosis of energy transport in iron buried layer targets using an extreme ultraviolet laser

AU - Shahzad, M.

AU - Culfa, O.

AU - Rossall, A. K.

AU - Wilson, L. A.

AU - Guilbaud, O.

AU - Kazamias, S.

AU - Delmas, O.

AU - Demailly, J.

AU - Maitrallain, A.

AU - Pittman, M.

AU - Baynard, E.

AU - Farjardo, M.

AU - Tallents, G. J.

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N2 - We demonstrate the use of extreme ultra-violet (EUV) laboratory lasers in probing energy transport in laser irradiated solid targets. EUV transmission through targets containing a thin layer of iron (50 nm) encased in plastic (CH) after irradiation by a short pulse (35 fs) laser focussed to irradiances 3 × 1016 Wcm-2 is measured. Heating of the iron layer gives rise to a rapid decrease in EUV opacity and an increase in the transmission of the 13.9 nm laser radiation as the iron ionizes to Fe5+ and above where the ion ionisation energy is greater than the EUV probe photon energy (89 eV). A one dimensional hydrodynamic fluid code HYADES has been used to simulate the temporal variation in EUV transmission (wavelength 13.9 nm) using IMP opacity values for the iron layer and the simulated transmissions are compared to measured transmission values. When a deliberate pre-pulse is used to preform an expanding plastic plasma, it is found that radiation is important in the heating of the iron layer while for pre-pulse free irradiation, radiation transport is not significant.

AB - We demonstrate the use of extreme ultra-violet (EUV) laboratory lasers in probing energy transport in laser irradiated solid targets. EUV transmission through targets containing a thin layer of iron (50 nm) encased in plastic (CH) after irradiation by a short pulse (35 fs) laser focussed to irradiances 3 × 1016 Wcm-2 is measured. Heating of the iron layer gives rise to a rapid decrease in EUV opacity and an increase in the transmission of the 13.9 nm laser radiation as the iron ionizes to Fe5+ and above where the ion ionisation energy is greater than the EUV probe photon energy (89 eV). A one dimensional hydrodynamic fluid code HYADES has been used to simulate the temporal variation in EUV transmission (wavelength 13.9 nm) using IMP opacity values for the iron layer and the simulated transmissions are compared to measured transmission values. When a deliberate pre-pulse is used to preform an expanding plastic plasma, it is found that radiation is important in the heating of the iron layer while for pre-pulse free irradiation, radiation transport is not significant.

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KW - Extreme ultraviolet radiation

KW - Opacity

KW - Hot carriers

KW - Photons

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