A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser

A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser. A motorized mirror at the target location redirects individual pulses of a mJ-class laser onto the diagnostic to allow the in-situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the 2nd and 3rd harmonic of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can be directly calibrated. In addition, channel cross-talk and polarization sensitivity can be determined. The calibration system has been employed repeatedly over the last two years and has enabled precise backscatter measurements of both stimulated Brillouin scattering and stimulated Raman scattering in gas-filled hohlraum targets that emulate conditions relevant to those in inertial confinement fusion targets

A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser

A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser 1 . A motorized mirror at the target location redirects individual pulses of a mJ-class laser onto the diagnostic to allow the in-situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the 2 nd and 3 rd harmonic of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can be directly calibrated. In addition, channel cross-talk and polarization sensitivity can be determined. The calibration system has been employed repeatedly over the last two years and has enabled precise backscatter measurements of both stimulated Brillouin scattering and stimulated Raman scattering in gas-filled hohlraum targets that emulate conditions relevant to those in inertial confinement fusion targets. 52.40.Nk, 52.58.N

Notes d’humour

Existe-t-il un humour sonore ? Qu’il s’agisse de chansons comiques ou de formes théâtrales, la musique est souvent mêlée à des constructions humoristiques. Mais qu’apporte-t-elle au juste ? Ce volume propose des descriptions ethnographiques de différents cas d’humour sonore. Il aborde des répertoires, des pratiques musicales et des techniques d’une grande diversité géographique et culturelle. L’analyse porte sur les modalités propres au sonore et sur ses interactions avec d’autres registres expressifs comme le geste ou la danse. Quels sont les procédés utilisés dans le comique musical (parodie, caricatures, ironie, absurde, etc.) ? Comment les auditeurs les identifient-ils ? Comment l’humour apparaît-il (ou non) lorsque différentes cultures musicales se rencontrent ? Autant de pistes que ce volume explore afin de comprendre les différents processus impliqués dans le comique musical

Émotions

L’étude des relations entre musique et émotions – historiquement un problème avant tout philosophique – connaît depuis quelques années un développement croissant dans le domaine des sciences cognitives. La plupart des théories émises reposent sur des approches de type esthétique ou psychologique, généralement centrées sur les répertoires classiques occidentaux, avec quelques incursions dans le domaine des musiques « actuelles ». Bien que cette question puisse a priori concerner toute société humaine, les ethnomusicologues ne l’ont que rarement abordée de manière approfondie. L’ambition de ce volume est de combler ce manque tout en répondant à l’attente de chercheurs d’autres horizons. À partir d’observations de terrain, les contributions analysent comment les affects sont générés, exprimés, partagés dans une société donnée

Euclid. I. Overview of the Euclid mission

The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015-2025 programme of the European Space Agency (ESA) that will provide high-resolution optical imaging, as well as near-infrared imaging and spectroscopy, over about 14,000 deg^2 of extragalactic sky. In addition to accurate weak lensing and clustering measurements that probe structure formation over half of the age of the Universe, its primary probes for cosmology, these exquisite data will enable a wide range of science. This paper provides a high-level overview of the mission, summarising the survey characteristics, the various data-processing steps, and data products. We also highlight the main science objectives and expected performance