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Home > Products > Monochromator Systems > DCM Upgrades

IDT have designed and implemented a full upgrade to the existing ‘Daresbury’ DCM on GSECARS Sector 13 at the APS. This was part of an upgrade of the ID beamline to a 1mrad canted undulator geometry.

The original DCM has been in operation for 15 years and the mechanical Bragg axle & vacuum vessel were re-used.

The upgraded DCM featured a new ultra-stable crystal cage designed for the 1mrad canted undulator beam geometry with indirect cryo-cooled Si(111) & Si(311) crystals, a new in-vacuum Bragg encoder using the latest Renishaw technology, and a new high-stability natural granite base block.

Technical Data

Axis	Range	Resolution	Repeatability
2nd crystal coarse pitch Stepper motor driven	±0.9°	0.45μrad	±0.68μrad
2nd crystal fine pitch Piezo driven	210μrad	<50nrad	<<1μrad
2nd crystal coarse roll Stepper motor driven	±1.5°	0.63μrad	±0.51μrad
2nd crystal fine roll Piezo driven	160μrad	<50nrad	<<1μrad
2nd crystal gap Translates 2nd crystal perpendicular to 1st crystal surface, used to maintain fixed offset	16mm	0.20μm	±0.18μm

Bending Magnet DCM Upgrade

installed on DUBBLE CRG at the ESRF

IDT have designed and implemented a full upgrade to the existing ‘Daresbury’ DCM on the DUBBLE CRG at the ESRF.

The original DCM featured a single Si(111) crystal set and has been in operation for 15 years.

The upgraded DCM features a new ultra-stable crystal cage Si(111) & Si(311) crystal sets with a novel direct water-cooling scheme optimised for the beam footprint, a new in-vacuum Bragg encoder using the latest Renishaw technology, and a new high-stability natural granite base block.

The existing goniometer and DC servo drive train, crystal cage extraction mechanism, and vacuum vessel & ion pump were reused.

Technical Data Upgraded DCM on DUBBLE

Axis	Range	Resolution	Repeatability
2nd crystal coarse pitch Stepper motor driven	±1°	0.94μrad	±0.46μrad
2nd crystal fine pitch Piezo driven	400μrad	<50nrad	<<1μrad
2nd crystal coarse roll Stepper motor driven	±1°	1.31μrad	±0.33μrad
2nd crystal fine roll Piezo driven	400μrad	<50nrad	<<1μrad
2nd crystal gap Translates 2nd crystal perpendicular to 1st crystal surface, used to maintain fixed offset	12mm	0.20μm	±0.20μm
Horizontal X translation Translates between Si(111) and Si(311) crystals	50mm	0.63μm	±0.50μm

Canted Undulator DCM Upgrade

installed on GSECARS at the APS

IDT can offer a cost-effective upgrade of an existing DCM to our latest ultra-stable crystal cage technology.

We have designed and implemented full upgrades of existing monochromators at the APS and ESRF: