Abstract
High-precision X-ray spectroscopy of highly charged ions at storage rings provides a sensitive test of quantum electrodynamics in strong Coulomb fields. To increase the precision of such experiments, silicon microcalorimeters have already been applied successfully. To minimize the interruption of beam times due to maintenance, a new cryogen-free \(^3\)He/\(^4\)He dilution refrigerator has been designed and is under commissioning. However, in cryogen-free systems microphonic noise due to vibrations contributes considerably to the overall noise and may limit the detector energy resolution. Therefore, we report on systematic vibration studies on a cryogen-free \(^3\)He/\(^4\)He dilution refrigerator which is specially adapted for experiments at storage rings.
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BlueFors Cryogenics, Arinatie 10, 00370 Helsinki, Finland.
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Acknowledgments
This work was supported by the German Research Council (DFG) through the Emmy Noether Grant KR3721/1-1 and by the Helmholtz International Center for FAIR (HICforFAIR) of the State of Hesse.
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Scholz, P.A., Kraft-Bermuth, S. & Andrianov, V. Systematic Vibration Studies on a Cryogen-Free \(^3\)He/\(^4\)He Dilution Refrigerator for X-ray Spectroscopy at Storage Rings. J Low Temp Phys 184, 576–582 (2016). https://doi.org/10.1007/s10909-015-1438-z
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DOI: https://doi.org/10.1007/s10909-015-1438-z