Abstract
The vibrational stability of a horizontally deflecting double-crystal monochromator (HDCM) is investigated. Inherently a HDCM will preserve the vertical beam stability better than a `normal' vertical double-crystal monochromator as the vibrations of a HDCM will almost exclusively affect the horizontal stability. Here both the relative pitch vibration between the first and second crystal and the absolute pitch vibration of the second crystal are measured. All reported measurements are obtained under active cooling by means of flowing liquid nitrogen (LN2). It is found that it is favorable to circulate the LN2 at high pressures and low flow rates (up to 5.9 bar and down to 3 l min(-1) is tested) to attain low vibrations. An absolute pitch stability of the second crystal of 18 nrad RMS, 2-2500 Hz, and a relative pitch stability between the two crystals of 25 nrad RMS, 1-2500 Hz, is obtained under cryocooling conditions that allow for 1516 W to be adsorbed by the LN2 before it vaporizes.
Highlights
As synchrotron storage rings are approaching diffractionlimited performance (Eriksson et al, 2014) it becomes crucial that the beamline optics are capable of preserving the brightness and coherence of the produced X-rays
In this article we report on the vibrational stability, both the relative pitch between the two crystals and the absolute Bragg stability of the crystal cage, of two identical horizontal double-crystal monochromators (HDCMs) that will be deployed on the NanoMAX (Johansson et al, 2013) and BioMAX (Thunnissen et al, 2013) beamlines at the MAX IV synchrotron in Lund, Sweden
The absolute pitch vibration of the second crystal is recorded at a Bragg angle of 9
Summary
As synchrotron storage rings are approaching diffractionlimited performance (Eriksson et al, 2014) it becomes crucial that the beamline optics are capable of preserving the brightness and coherence of the produced X-rays. This in turn means that the mechanical systems supporting the optics must be exceedingly stable. In this article we report on the vibrational stability, both the relative pitch between the two crystals and the absolute Bragg stability of the crystal cage, of two identical horizontal double-crystal monochromators (HDCMs) that will be deployed on the NanoMAX (Johansson et al, 2013) and BioMAX (Thunnissen et al, 2013) beamlines at the MAX IV synchrotron in Lund, Sweden
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