Abstract
We are developing a compact adiabatic demagnetization refrigerator (ADR) dedicated for TES X-ray microcalorimeter operation. Ferric ammonium alum (FAA) was grown in a stainless-steel container in our laboratory. This salt pill was mounted together with a superconducting magnet and a conventional mechanical heat-switch in a dedicated helium cryostat. Using this system, we achieved \({ }20\) h below 100 mK. Initially, we used a 3 mm thick silicon steel shield around the ADR magnet and a Nb/Cryoperm double shield around the detector. However, this silicon steel shield allowed a \({\sim }50\) mT field at the detector position when a full field (3 T) was applied, and caused the Nb shield around the detector to trap a magnetic field. The observed transition curve of a TES was broad (\({\sim }20\) mK) compared to \({\sim }4\) mK obtained in a dilution refrigerator. By increasing the shield thickness to 12 mm, transition width was improved to \({\sim }4\) mK, which suggests that the shields work as expected. When we operated a TES microcalorimeter, energy resolution was \(14.5\pm 0.7\) eV (FWHM) at 5.9 keV.
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