Feedback system of a liquid nitrogen cooled double-crystal monochromator: design and performances

Abstract : Abstract We report on a new setup of indirect cryogenic cooling system for double-crystal monochromator running on BM30b / FAME beamline at the ESRF (Grenoble, France). This device has been conceived to limit the vibrations on the first diffracting crystal and to maintain it at a constant temperature. These points are crucial to maximize the beamline stability. Moreover, the relative angular position of the second crystal is dynamically adjusted by a piezoelectric transducer coupled with a feedback system in order to always be at the maximum of the rocking curve during a XAS scan. The temperature is stabilized with a 1/100° accuracy with two principal consequences. The energy resolution is close to the theoretical value (E/E=5.6 10-6 for Si(220)) and the precision of the energy positioning is extremely good even if the power load changes. A feedback mechanism allows a permanent and automatic optimisation of the angle between the two crystals of the monochromator. The intensity of the monochromatic beam remains optimized 1) when the intensity of the electron beam decreases in the storage ring and 2) during an energy scan.
Type de document :
Article dans une revue
Journal of Synchrotron Radiation, International Union of Crystallography, 2005, 13 (1), pp.59-68. <10.1107/S0909049505037441>


https://hal-insu.archives-ouvertes.fr/insu-00713235
Contributeur : Olivier Proux <>
Soumis le : vendredi 29 juin 2012 - 16:08:45
Dernière modification le : lundi 11 mai 2015 - 10:16:26
Document(s) archivé(s) le : dimanche 30 septembre 2012 - 02:40:38

Fichier

2006_JSR_Proux.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Olivier Proux, Vivian Nassif, Alain Prat, Olivier Ulrich, Eric Lahera, et al.. Feedback system of a liquid nitrogen cooled double-crystal monochromator: design and performances. Journal of Synchrotron Radiation, International Union of Crystallography, 2005, 13 (1), pp.59-68. <10.1107/S0909049505037441>. <insu-00713235>

Exporter

Partager

Métriques

Consultations de
la notice

185

Téléchargements du document

339