1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Subnanosecond Thomson scattering setup for space and time resolved measurements with reduced background signal
Rent:
Rent this article for
USD
10.1063/1.2038667
/content/aip/journal/rsi/76/9/10.1063/1.2038667
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/9/10.1063/1.2038667

Figures

Image of FIG. 1.
FIG. 1.

Schematic overview of the complete TS setup, with the laser table shown on the left-hand side (see the top left for an enlargement of the leftmost part), and the TGS-II spectrograph at the top right. After passing through the plasma inside the vacuum chamber, the laser beam is collected by a beam dump. The scattered light is collected and imaged onto the entrance slit of the spectrograph by two achromatic lenses, of which the opening angle is matched to that of the spectrograph.

Image of FIG. 2.
FIG. 2.

Schematic drawing of the laser path between the corner cubes in the optical delay line. The parts of the optical path inside the corner cubes have been omitted for clarity. Distances between the optical elements are not to scale; in particular, in the actual setup, the large corner cube is placed much further away from the other elements, to obtain a long path length.

Image of FIG. 3.
FIG. 3.

Ray-trace simulated image spots in ZEMAX for four different cases: (a) , ; (b) , ; (c) , ; and (d) , , for a central wavelength of . Here, and represent shifts from the center of the image in the spatial and wavelength directions, respectively. The vertical bars represent sizes of for parts (a) and (c), and for parts (b) and (d).

Image of FIG. 4.
FIG. 4.

Example of rotational Raman scattered spectrum from nitrogen gas. In this case, the signal was integrated over all spatial channels.

Image of FIG. 5.
FIG. 5.

Example of a Thomson scattered signal recorded with the new setup. Top frame: a “raw” vertically polarized signal, showing strong plasma emission in spectral lines. Bottom frame: the same signal, after subtraction of the horizontally polarized part of the plasma background. This image was seven times digitally intensified compared to the top image. The feature between and is a part of the plasma background that remained after background subtraction, but this part of the spectrum could simply be ignored while fitting the TS signal to a theoretical curve. The curved shapes between roughly 2 and on either side of the spectrum represent the TS signal. The dark area in the center is due to the presence of the stray light filter.

Tables

Generic image for table
Table I.

Root mean squares of the distances of individual ray-trace points from each spot center, produced by ZEMAX for different horizontal positions inside the plasma and different wavelengths. and are defined as the shifts from the central position and the central wavelength, respectively, which is in this case. For evenly distributed points in a round image spot, the spot radius equals .

Loading

Article metrics loading...

/content/aip/journal/rsi/76/9/10.1063/1.2038667
2005-09-02
2014-04-23
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Subnanosecond Thomson scattering setup for space and time resolved measurements with reduced background signal
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/9/10.1063/1.2038667
10.1063/1.2038667
SEARCH_EXPAND_ITEM