title: Performance of a silicon monochromator under high heat load.
abstract: The performance of a cryogenically cooled double-crystal silicon monochromator was studied under high-heat-load conditions with total absorbed powers and power densities ranging from 8 to 780 W and from 8 to 240 W mm(-2), respectively. When the temperature of the first crystal is maintained close to the temperature of zero thermal expansion of silicon, the monochromator shows nearly ideal performance with a thermal slope error of 0.6 µrad. By tuning the size of the first slit, the regime of the ideal performance can be maintained over a wide range of heat loads, i.e. from power densities of 110 W mm(-2) (at total absorbed power of 510 W) to 240 W mm(-2) (at total absorbed power of 240 W).
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Aleksandr I
authors.initials: AI
authors.lastname: Chumakov
authors.affiliation: Deutsches Elektronen-Synchrotron, D-22607 Hamburg, Germany.
authors.forename: Ilya
authors.initials: I
authors.lastname: Sergeev
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Celse
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Rudolf
authors.initials: R
authors.lastname: Rüffer
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Lesourd
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.affiliation: European Synchrotron Radiation Facility, F-38043 Grenoble, France.
authors.forename: Manuel
authors.initials: M
authors.lastname: Sánchez del Río
keywords: X-ray optics; cryogenic cooling; high-heat-load optics; silicon monochromator