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Cryo-Cooled Horizontally Deflecting DCM

installed on XFM Beamline at the Australian Synchrotron

The IDT DCM installed on the X-ray Fluorescence Microprobe beamline at the Australian Synchrotron is a horizontally deflecting fixed-offset monochromator operating over an energy range of 4keV - 25keV, with Si(111) & Si(311) crystal sets in single chamber

The DCM features a novel cryo-cooling system with soft annealed copper couplings giving minimal vibration transmission from the cooling circuit to the first crystal while maintaining excellent thermal contact.

Other features of the DCM include:

• Upgrade path for multilayers.
• Ultra stable horizontal deflecting geometry.
• Preservation of undulator coherence.
• High precision, ultra-stiff rotary table.
• Fast piezo feedback for fine control of 2nd crystal pitch & roll.
• Very compact footprint in optics enclosure.
• High vacuum level <5×10-8 mbar.
• Ultra stable base block of natural granite with measured amplification factor of 1.0.
• EPICS control system.
• Measured stability of 18 nrad.

IDT’s unique approach of multiple thermal barriers thermally isolates the crystals and cryogenic cooling circuit from the rest of the monochromator. This prevents thermal leakage into the monochromator mechanics and minimises thermo-mechanical drift, removing the need for water stabilisation circuits and offering exceptional mechanical stability.

18 nrad Beam Stability Measurements

Click to enlarge

Thermocouple Readings

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