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B. Annexe and . Alignement-de, La méthode que je propose est celle qui me parait la plus directe pour l'alignement de RESOXS sur la ligne SEXTANTS. La difficulté de l'alignement dans les mesures utilisant des rayons X est qu'on ne voit pas ces rayons X. Pour cela il faut donc effectuer des scans et regarder l'intensité en fonction du déplacement ou de la rotation de l'´ echantillon ou du détecteur pour définir la position de référence de l'´ echantillon et du détecteur La particularité de RESOXS, c'est que ce n'est pas une expérience fixe, elle peutêtrepeutêtre déplacée pour aller sur d'autres lignes delumì eres, ou bienêtrebienêtre remplacée par d'autres expériences spécifiques propres aux utilisateurs. Il faut donc faire un préaligment de la gamelle lorsqu'on la rebranche sur la ligne. Tout d'abord on l'incline de deux degrés, puis on utilise le faisceaù a l'ordre 0, c'est-` a-dire le faisceau de l'aimant de courbure qu'on observe avec les onduleurs grands ouverts et qui est légèrement bleu, pour le centrer sur la bride diamétralement opposéè a l'entrée du faisceau. Pour cela il faut au préalable reculer l'´ echantillon pour laisser passer le faisceau. Une fois ce faisceau centrécentréà l'oeil, on utilise un faisceau provenant des onduleurs d'uné energie et polarisation données, et on aligne en " aveugle " grâcè a des scans, echantillon par rapport au faisceau synchrotron Il existe autant demanì ere d'aligner que de scientifiques, de diffractomètres, et de lignes synchrotron

. Si-celui-ci, cela siginifie que le centre de rotation de la gamelle est devant le point de contact entre le faisceau et l'´ echantillon. Il faut donc avancer l'´ echantillon le long du faisceau pour mettre le centre de rotation sur cette intersection, Il faut ensuite refaire un scan tx pour que l'´ echantillon coupe de moitié le faisceau directe, p.209

?. Tourne-l-'´-echantillon-de, ?180?: ? = 0? 15, pp.13-14