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A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega lasera)
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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10.1063/1.2953413
/content/aip/journal/rsi/79/10/10.1063/1.2953413
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/10/10.1063/1.2953413
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the backscatter calibration system. The pulsed laser is injected through the TIM, and the beam is deflected from the target chamber center onto the backscatter diagnostics.

Image of FIG. 2.
FIG. 2.

(Left) Shot locations on the NBI plate from a calibration run. The insert shows a typical spot from the calibration laser. (Right) Sensitivity map for the long wavelength channel.

Image of FIG. 3.
FIG. 3.

Variation of NBI sensitivity (in the short wavelength channel) with time since last NBI plate change. The sensitivity drops by over 90% over a few months. The lower sensitivity of beam 30 is due to the oblique viewing angle of the NBI cameras.

Image of FIG. 4.
FIG. 4.

NBI data in the short wavelength channel, showing strong backscatter from stimulated Brillouin scattering. The sketch shows the alignment of the Hohlraum using one beam as on-axis probe beam. The energies measured by FABS and on the NBI plates are denoted in the image.

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/content/aip/journal/rsi/79/10/10.1063/1.2953413
2008-10-31
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega lasera)
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/10/10.1063/1.2953413
10.1063/1.2953413
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