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Adaptive indirectly cooled monochromator crystals at HASYLAB
H Schulte-Schrepping1, J Heuer, B Hukelmann
1HASYLAB am DESY, Notkestrasse 85, 22603 Hamburg, Germany.
Journal of Synchrotron Radiation
|July 21, 2004
Summary
This study presents an improved high-heat-load monochromator design for synchrotron radiation beamlines. Mechanical compensation and indirect cooling enhance crystal stability under significant heat loads.
Area of Science:
- Synchrotron Radiation Optics
- X-ray Optics
- Materials Science
Background:
- High-heat-load monochromators are crucial for synchrotron radiation beamlines.
- The HASYLAB 'Torii' design has been successfully employed but requires further optimization.
- Mechanical and thermal stresses can deform optical surfaces, impacting performance.
Purpose of the Study:
- To present advancements in the high-heat-load monochromator design.
- To improve the stability and safety of the monochromator under high heat flux.
- To characterize the performance of the upgraded monochromator.
Main Methods:
- Mechanical compensation using a bending mechanism for crystal bowing.
- Replacement of piezoceramic actuators with copper rod thermal expansion actuators.
- Transition from direct to indirect water-cooling for enhanced safety.
Main Results:
- The upgraded monochromator demonstrates improved stability under heat load.
- The new design incorporates safer indirect water-cooling.
- Characterization shows a Si(111) rocking-curve width of 8.3 arcsec at 9.5 keV under 500 W heat load.
Conclusions:
- The revised monochromator design effectively mitigates heat-induced surface deformation.
- The indirect cooling system offers enhanced operational safety.
- The performance metrics confirm the suitability for high-heat-load synchrotron applications.