Adaptive silicon monochromators for high-power wigglers; design, finite-element analysis and laboratory tests

Area of Science:

• Synchrotron Radiation and X-ray Optics

Background:

• Multipole wigglers in storage rings generate significant X-ray power (up to kilowatts), with future facilities aiming for 30 kW.
• Despite lower power density than undulators, the thermal strain from these sources can severely degrade X-ray optical system performance.

Purpose of the Study:

• To analyze the thermal strain effects on X-ray optical systems caused by high-power wiggler and undulator sources.
• To compare finite-element analysis (FEA) results with experimental data for optimized adaptive optical designs.

Main Methods:

• Finite-element analysis (FEA) was employed to model thermal strain fields in X-ray optical components.
• Experimental validation involved double-crystal rocking curve measurements using a laboratory X-ray source.
• Further testing was conducted at wiggler sources (CHESS, ESRF) and an undulator source (HASYLAB).

Main Results:

• FEA results were compared with experimental double-crystal rocking curves, demonstrating the impact of thermal strain.
• Successful tests at various synchrotron sources confirmed the predicted performance loss in X-ray optical systems.
• The study provides data crucial for developing optimized adaptive optical designs for high-brightness X-ray sources.

Conclusions:

• Thermal strain from high-power X-ray sources significantly affects the performance of X-ray optical systems.
• FEA combined with experimental validation is essential for understanding and mitigating these thermal effects.
• The findings support the development of adaptive optics for next-generation synchrotron radiation facilities.