Développement d'optiques multicouches pour la spectrométrie X large bande du rayonnement émis par les plasmas

Benoit Emprin 1
1 Laboratoire Charles Fabry / Optique XUV
LCF - Laboratoire Charles Fabry
Abstract : Within the framework of the research on inertial confinement fusion, the “Commissariat à l’énergie atomique et aux énergies alternatives” has studied and implemented an absolute calibrated time-Resolved broadband soft x-Ray spectrometer, called “Diagnostic de Mesure du rayonnement X”. This diagnostic, composed of 20 measurement channels, measures the emitted radiant power from a laser created plasma in the range from 50 eV to 20 keV. We have developed additional measurement channels to obtain redundancy and an improvement in measurement accuracy. The principle of these new channels is based on an original concept to obtain spectral bounded flat-Responses. Two channels have been developed for the 2 – 4 keV and 4 – 6 keV spectral ranges, using aperiodic multilayer mirrors made at the “Laboratoire Charles Fabry” with Cr/Sc and Ni/W/SiC/W layers respectively. These mirrors were characterized at synchrotron radiation facilities and integrated into the spectrometer. The two new channels were used during laser-Plasma experimental campaigns at the OMEGA laser facility in Rochester (USA). This allowed us to determine directly the radiant power with only one measurement within a certain spectral band, and with a better precision when compared with using standard channels. The results, in good agreement with the standard measurement channels, allowed us to validate the use of aperiodic multilayer mirrors for X-Ray broadband spectrometry.
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Benoit Emprin. Développement d'optiques multicouches pour la spectrométrie X large bande du rayonnement émis par les plasmas. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0014⟩. ⟨tel-01127158⟩

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