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Study of laser megajoule calorimeter's thermal behaviour for energy measurement uncertainty optimisation
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View: Figures


Image of FIG. 1.
FIG. 1.

REC calorimeter. (a) Profile view, (b) rear face of the aluminium plate, and (c) mesh visualization.

Image of FIG. 2.
FIG. 2.

Spectral internal transmittance of f NG 11 (thickness = 1 mm).

Image of FIG. 3.
FIG. 3.

Comparison of radiative source term for λ = 351 nm (line measurement conditions) and for λ = 1030 nm (calibration measurement conditions).

Image of FIG. 4.
FIG. 4.

Calorimeter response simulation for the two deposit modes.

Image of FIG. 5.
FIG. 5.

Visualization of the temperature fields for the two deposit mode (because of the symmetry a quart of the calorimeter is modelled).

Image of FIG. 6.
FIG. 6.

Schematic representation of optical technique.

Image of FIG. 7.
FIG. 7.

Laser power pulse measurement using photodiode.

Image of FIG. 8.
FIG. 8.

Schematic representation of electrical technique.

Image of FIG. 9.
FIG. 9.

Simulated response of REC for λ = 351 nm and λ = 1030 nm.

Image of FIG. 10.
FIG. 10.

Comparison between simulated and measured normalized response for λ = 351 nm and λ = 1030 nm.

Image of FIG. 11.
FIG. 11.

Normalized REC response for different laser pulse durations (numerical and experimental).

Image of FIG. 12.
FIG. 12.

Normalized simulated and measured REC response for different electrical pulse durations.

Image of FIG. 13.
FIG. 13.

Experimental response for two different laser beam size.

Image of FIG. 14.
FIG. 14.

Temperature fields visualisation for hot spot influence simulation.

Image of FIG. 15.
FIG. 15.

Comparison between simulated REC responses after a non-uniform beam absorption and after a uniform beam absorption.

Image of FIG. 16.
FIG. 16.

Influence of ambient temperature change on calorimeter response.

Image of FIG. 17.
FIG. 17.

Influence of contact between support and calorimeter on REC response.

Image of FIG. 18.
FIG. 18.

Calorimeter response after successive pulse.

Image of FIG. 19.
FIG. 19.

Responses for successive pulses comparison.

Image of FIG. 20.
FIG. 20.

Change on the amplitude between successive pulses in function of the rest time.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of laser megajoule calorimeter's thermal behaviour for energy measurement uncertainty optimisation