What question did this study set out to answer?

The aim is to design an active cooling system for grating mirrors that improves thermal response and optical quality.

April 4, 2026JACOW0 citationsOpen Access

Active grating cooling system design for soft X-ray monochromator

AMAlban Moyne AVAmparo Vivo DCDamien Coulon

Key Points

The aim is to design an active cooling system for grating mirrors that improves thermal response and optical quality.
Utilized flexible copper braids to reduce mechanical stress on grating mirrors.
Implemented active temperature control to enhance thermal response.
Followed a model-based design approach integrating dynamic thermal simulations and static finite element analysis.
Conducted interferometric measurements to assess optical performance.
Maintained mirror temperature stability within ±2 mK under variable heat loads.
Reduced thermal settling time from several hours to under 10 minutes.
Improved optical surface flatness contributed less than 50 nrad RMS to slope error.
Enhanced beamline energy resolution from 25.6 meV to 22 meV.

Abstract

We present an active cooling system for the grating mirrors of ID32 soft X-ray beamline at the European Synchrotron Radiation Facility (ESRF). The design combines flexible copper braids to minimize mechanical stress in the grating mirrors with active temperature control to accelerate thermal response. Development followed a model-based approach, integrating dynamic Simulink thermal simulations with static finite element analysis. Under variable beam heat loads, the system maintains mirror temperature stability within ±2 mK and reduces thermal settling time from several hours to under 10 minutes. Interferometric measurements confirm improved optical surface flatness, with the cooling system contributing less than 50 nrad RMS to slope error. This enhancement translates to improved beamline energy resolution from 25.6 meV to 22 meV.

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