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The Performance of a Cryogenically Cooled Monochromator for an In-vacuum Undulator Beamline by Lin Zhang; Wah-Keat Lee; Michael Wulff; Laurent Eybert is a Physics and Astronomy article available to read on EtoBox.

What is The Performance of a Cryogenically Cooled Monochromator for an In-vacuum Undulator Beamline about?

The channel-cut silicon monochromator on beamline ID09 at the European Synchrotron Radiation Facility is indirectly cooled from the sides by liquid nitrogen. The thermal slope error of the diffracting surface is calculated by finite-element analysis and the results are compared with experiments. The slope error is studied as a function of cooling coefficients, beam size, position of the footprint and power distribution. It is found that the slope error versus power curve can be divided into three regions: (i). The linear region: the thermal slope error is linearly proportional to the power. (ii). The transition region: the temperature of the Si crystal is close to 125 K; the thermal slope error is below the straight line extrapolated from the linear curve described above. (iii). The non-linear region: the temperature of the Si crystal is higher than 125 K and the thermal slope error increases much faster than the power. Heat-load tests were also performed and the measured rocking-curve widths are compared with those calculated by finite-element modeling. When the broadening from the intrinsic rocking-curve width and mounting strain are included, the calculated rocking-curve width v

Who reads The Performance of a Cryogenically Cooled Monochromator for an In-vacuum Undulator Beamline?

Author

Lin Zhang; Wah-Keat Lee; Michael Wulff; Laurent Eybert

Publisher

International Union of Crystallography; Blackwell Publishing Inc.; International Union of Crystallography (IUCr) (ISSN 0909-0495)

Published

2003

Language

EN

Field

Physics and Astronomy (Physical Sciences)