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Thomson-scattering techniques to diagnose local electron and ion temperatures, density, and plasma wave amplitudes in laser produced plasmas (invited)
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Image of FIG. 1.
FIG. 1.

(Color) A typical Thomson-scattering setup is shown. The spectrometer and streak camera slits are imaged into the plasma plane defining the Thomson-scattering volume. The scattering vector diagram is shown.

Image of FIG. 2.
FIG. 2.

(Color) (a) A Thomson-scattering spectrum from scattering off a Au blow-off plasma is shown where the temporal evolution of the two ion-acoustic features is clearly observed. (b) The spectrum (squares) at is fit (line) with a theoretical form factor to give an electron temperature of .

Image of FIG. 3.
FIG. 3.

(Color) The sensitivity of the spectral fit to the electron temperature is shown by varying the electron temperature by 20% around the best fit.

Image of FIG. 4.
FIG. 4.

(Color) (a) The electron temperature profile is measured using an imaging Thomson-scattering diagnostic. The CH-gas-filled Hohlraum is heated from one side (top of figure) producing an asymmetrical temperature profile. (b) The temperature is determined at each location (squares) using the form factor. A hydrodynamic simulation using a flux limited diffusion model with a flux limiter of is shown (line).

Image of FIG. 5.
FIG. 5.

(Color) (a) The streaked Thomson-scattering spectrum shows a heavily damped carbonlike mode and a weakly damped hydrogenlike mode early in time. The damping of the modes is reversed by the end of the probe beam. The spectra are fitted to determine , , and at selected times of (b) , (c) , (d) , (e) , and (f) . The scattered light is collected from the center of a gas-filled Hohlraum.

Image of FIG. 6.
FIG. 6.

(Color) The relative electron density evolution measured (black line) using the power collected in the Thomson-scattering diagnostic is compared with a hydrodynamic simulation for a CH-gas-filled Hohlraum with a total heater beam energy of .

Image of FIG. 7.
FIG. 7.

(Color) (a) The ratio of as a function of the normalized ion-wave amplitude shows evidence of the generation of hot ions by ion trapping in plasmas. (b) A frequency shift is measured on the ion-acoustic wave driven by SBS; the solid line is the measured spectrum from a second Thomson-scattering diagnostic that is not affected by the SBS process. Half of the spectrum is filtered at the slit of the streak camera using an OD2.6.


Generic image for table
Table I.

The magnification on all of these systems is approximately . ND is the optical density inserted at the spectral slit. is the average number of measured counts in the ion-acoustic features; is average number of background counts measured at the same time as the Thomson-scattering signal. Signals are measured while the heater beams are on. For each detector the signal-to-noise is less than five counts. The detector sensitivity is calculated from the manufacture data sheets.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thomson-scattering techniques to diagnose local electron and ion temperatures, density, and plasma wave amplitudes in laser produced plasmas (invited)