WEPH42
AXILON AG, Koeln, Germany
SOLEIL, Gif-sur-Yvette, France
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WEPH42 |
Sub-20-nrad Stability of an LN2-Cooled Vertical-Offset Double-Crystal Monochromator | |
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| We have developed a compact and rigid mechanical design for a liquid-nitrogen-cooled vertically-deflecting double-crystal monochromator (DCM) for the ANATOMIX beamline at Synchrotron SOLEIL. An in-situ differential interferometer setup directly measures the pitch and roll parallelism between the 1st and the 2nd crystal under operating conditions with liquid-nitrogen flow and at pressures below 10-8 mbar. Factory measurements at moderate LN2 flow rates show a stability of the relative pitch of 25 nrad RMS (0.1 to 10 kHz) and a first relevant resonant frequency of 175 Hz. At lower flow rates, still sufficient to dissipate several hundred watts of heat load, an angular stability of 15 nrad RMS is achieved. | ||
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Poster WEPH42 [1.332 MB] | |
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