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Characterizing counter-streaming interpenetrating plasmas relevant to astrophysical collisionless shocksa)
a)Paper TI3 6, Bull. Am. Phys. Soc. 56, 282 (2011).
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10.1063/1.3694124
/content/aip/journal/pop/19/5/10.1063/1.3694124
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3694124
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The experimental setup is shown for the double foil configuration. Each foil is irradiated with ten 351 nm (), laser beams using 1 ns square pulses with 250 μm focal spots. A 527 nm () probe beam is focused at the target chamber center. Thomson scattered light is collected 117° relative to the probe. This Thomson scattering geometry results in a matched k-vector normal to the target surface.

Image of FIG. 2.
FIG. 2.

A composite image is shown of the electron feature (a) and the ion feature (b) for the single foil configuration. A heavy dashed line in (b) is shown at the wavelength of the Thomson scattering probe beam. Thin dashed lines are shown to guide the eye.

Image of FIG. 3.
FIG. 3.

The Thomson scattering cross section is fit to the measured Thomson scattering electron feature at 5.5 ns to determine the electron temperature and density from a single foil experiment. The best fit to the experimental data (red line) is calculated using an electron temperature of 100 eV and an electron density of . (a) The electron temperature is increased to 125 eV (green line) and decreased to 75 eV (blue line) to demonstrate the sensitivity of the fit. (b) The electron density is varied from (green line) to (blue line) as well. A stray light block is used and heavily filters wavelengths between 520–537 nm.

Image of FIG. 4.
FIG. 4.

The Thomson scattering cross section is fit to the measured Thomson scattering ion feature at 5.5 ns to determine the ion temperature and plasma flow velocity. The best fit to the experimental data (red line) is calculated using an electron temperature and density determined from the electron feature (100 eV and ), ion temperature of 40 eV, and a plasma flow velocity of . (a) The ion temperature is increased to 60 eV (green line) and decreased to 20 eV (blue line) to demonstrate the sensitivity of the fit. (b) The plasma flow velocity is varied from (green line) to (blue line) as well.

Image of FIG. 5.
FIG. 5.

A composite image is shown of the electron feature (a) and the ion feature (b) for the double foil configuration. A heavy dashed line is shown at the wavelength of the Thomson scattering probe beam. The thin white dashed lines from Figure 2 are reproduced to facilitate comparisons of the spectral shifts. The thin red dashed line is a guide to the eye for the double foil spectra. A decrease in spectral shift of ∼20% relative to the single foil data is observed at 8.8 ns, a result of decreasing plasma flow velocity.

Image of FIG. 6.
FIG. 6.

The Thomson scattering cross section is fit to the measured Thomson scattering electron feature at 5.5 ns to determine the electron temperature and density from a double foil experiment. The best fit to the experimental data (red line) is calculated using an electron temperature of 880 eV and an electron density of . (a) The electron temperature is increased to 1010 eV (green line) and decreased to 750 eV (blue line) to demonstrate the sensitivity of the fit. (b) The electron density is varied from (green line) to (blue line) as well. A stray light block is used and heavily filters wavelengths between 520-537 nm.

Image of FIG. 7.
FIG. 7.

The Thomson scattering cross section is fit to the measured Thomson scattering ion feature at 5.5 ns from a double foil target to determine the ion temperature and plasma flow velocity. The best fit to the experimental data (red line) is calculated using an electron temperature and density determined from the electron feature (880 eV and ) and ion temperature of 1000 eV, and a plasma flow velocity of . (a) The ion temperature is increased to 1200 eV (green line) and decreased to 800 eV (blue line) to demonstrate the sensitivity of the fit. (b) The plasma flow velocity is varied from (green line) to (blue line) as well.

Image of FIG. 8.
FIG. 8.

(a) Thomson scattering with a k-vector parallel to the target surface is shown. The experimental data at 5.5 ns (red line) are compared to the Thomson scattering dynamic structure factor (white line) to determine the ion temperature. (b) The measured ion temperature for a k-vector normal to the target (blue squares) and parallel to the target surface (orange diamonds) is shown.

Image of FIG. 9.
FIG. 9.

The measured flow velocity (a), electron density (b), electron temperature (c), and ion temperature (d) are shown for the double foil (blue squares) and single foil (red circles) configurations.

Image of FIG. 10.
FIG. 10.

The electron temperature from the double foil configuration (squares) is compared to Eq. (10) (black line) evaluated using the ion density inferred from the measured electron density and the measured flow velocity from the single foil configuration.

Image of FIG. 11.
FIG. 11.

The ion temperature from the double foil configuration (squares) is compared to Eq. (11) evaluated using the ion density inferred from the measured electron density and the measured flow velocity for the single foil configuration assuming rapid energy transfer between carbon and hydrogen ions (black line) and no energy transfer between carbon and hydrogen ions (dashed line).

Image of FIG. 12.
FIG. 12.

The widths of the shock transition regions using Eqs. (2) (electrostatic shock, light blue points) and (3) (electromagnetic shock, red points) are compared to the measured Coulomb mean-free-path (dark blue points) and (black points). The interaction length (black line) between the plasma flows is also shown.

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/content/aip/journal/pop/19/5/10.1063/1.3694124
2012-03-21
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterizing counter-streaming interpenetrating plasmas relevant to astrophysical collisionless shocksa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3694124
10.1063/1.3694124
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