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Figure 4
Measurements of the crystal vibrations induced by cryogenic cooling at a low (5 W) heat load. Solid and open circles show the results of two independent measurements of rocking-curve widths (FWHM) of the Si 555 reflection for 36 keV X-rays as a function of rotation frequency of the lquid-nitrogen cryogenic pump. The horizontal dashed line gives the theoretically expected value for ideal crystals. The left, right and upper insets show the rocking curves averaged over frequency ranges of 20–47 Hz and 61–80 Hz, and at 52 Hz, respectively. Solid lines in the inserts are to guide the eyes.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 11| Part 2| February 2004| Pages 132-141
doi:10.1107/S0909049503026785
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