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Enhancement of the JET edge LIDAR Thomson scattering diagnostic with ultrafast detectorsa)
a)Contributed paper, published as part of the proceedings of the 17th Topical Conference on High-Temperature Plasma Diagnostics, Albuquerque, New Mexico, May 2008.
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View: Figures


Image of FIG. 1.
FIG. 1.

An overview of the JET edge LIDAR system optics near the Tokamak.

Image of FIG. 2.
FIG. 2.

Detector response time as measured by the manufacturer and by the LIDAR team.

Image of FIG. 3.
FIG. 3.

EQE of the different detectors used on the JET edge LIDAR system; MA-2, GaAs and GaAsP. Note that the ruby laser wavelength is 694 nm.

Image of FIG. 4.
FIG. 4.

Detector responses to a dc light source, showing the comparison between the old and new detectors and the very fast switch-on .

Image of FIG. 5.
FIG. 5.

The edge LIDAR spectrometer spectral functions.

Image of FIG. 6.
FIG. 6.

Raw data traces of the enhanced JET edge LIDAR system, showing the four detectors. The sudden increase in signal to the right of the trace is caused by the laser beam hitting the JET machine wall, this saturates the detectors. A small difference in timing is visible, this is caused by a difference in total distance to each detector, this is calibrated for.

Image of FIG. 7.
FIG. 7.

Data from the upgraded edge LIDAR system, showing the data along the laser line of sight.

Image of FIG. 8.
FIG. 8.

Showing the edge LIDAR data mapped on to the machine midplane and compared to other diagnostics.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhancement of the JET edge LIDAR Thomson scattering diagnostic with ultrafast detectorsa)