The cryogen-free, adiabatic demagnetization refrigerator is specially designed for use with cryogenic detectors at sub-Kelvin temperatures. The project pushes the technology into the realm of reliable, compact and user-friendly devices, which can be easily transported and mounted on beam-lines or telescope facilities.
The prototype detector stage works with a cryogenic sensor (transition-edge sensor or magnetic penetration thermometer) which can achieve a resolution of about 10
eV at a few keV (soft x-rays). By lowering the temperature range and to introducing continuous, high-power, low-temperature cooling, we have a high-resolution cryogenic spectrometer system
The Stefan Meyer Institute plans to use the detector system to make an improved measurement of the mass of the kaon. Various cryogenic detectors will be tested with a view to achieving the necessary resolution at 10 keV x-ray energies created in kaonic atoms. Later stages of the project should see lower temperatures and higher resolutions, with improved count rates in an optimised experimental set-up.
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