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Figure 3
Results of the vibration test. (a) Time evolutions of the current in the ionization chamber IC2 at the maximum (dotted line) and half-maximum (solid line) of the rocking curve (left and top axes) superimposed on the plot of the rocking curve (right and bottom axes). The angular displacement of the crystal Δθ is evaluated from the amplitude of the current variation ΔI and the slope of the rocking curve at the half-maximum position. (b) The power spectral density (PSD) for the frequency spectra of the current in the ionization chamber IC2 measured at the half-maximum of the rocking curve with the cryogenic pump switched on (with a frequency of 42 Hz) and off. (c, d) Dependencies of the derived angular displacement of the crystal Δθ (c) and of the rocking curve width (d) on the frequency of the cryogenic pump. The horizontal dashed line in (d) shows the theoretical width of the rocking curve.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 2| January 2014| Pages 315-324
doi:10.1107/S1600577513033158
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