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Bending Magnet DCM

Nickel Foil Quick EXAFS Scan from B18

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The IDT Bending Magnet DCM features a direct water-cooled first crystal with a novel small bore cooling arrangement designed to match the specific beam footprint to minimise thermal gradients. Other features of the monochroamtor are:

• High precision, ultra-stiff rotary table.
• Stepper or DC servo driven Bragg axis.
• Cooling circuits running via central bore of main rotary table.
• Guard vacuum on water cooling circuit to prevent water-to-vacuum joints.
• Access to crystal cage via sliding door.
• Full extraction of crystal cage on simple linear rails for maintenance.
• Very compact footprint in optics enclosure.
• High vacuum level 5×10-8 mbar.
• Very stable base block of natural granite.
• In-vacuum encoder system.
• EPICS control system.

IDT have installed bending magnet monochromators on beamlines B16, B18 and B21 at Diamond Light Source, and on the DUBBLE CRG at the ESRF.

The bending magnet DCM installed on beamline B18 at Diamond Light Source is designed to perform Quick EXAFS experiments and features a DC servo-driven Bragg axis for high Bragg speeds. The DCM is required to operate in scanning mode. Beam stability during the scan is therefore very important. The DCM has completed over 150,000 scans since installation.

• Energy range 2.05keV - 35keV.
• Si(111) & Si(311) crystal sets in single chamber with automated crystal exchange.
• Step, quick & continuous scanning EXAFS mode.
• Vertically deflecting bounce-down geometry with 25mm fixed beam offset.
• High speed scanning mode of several °/sec.