Quantum sensors

L. Fleischmann, C. Enss

Many interesting applications in material science, astro-particle physics, atomic and nuclear physics require the detection of single x-ray quanta with extremely high energy resolution. In recent years micro-calorimeters operated at very low temperatures (T < 0.1 K) have proven to fulfill such demands. The concept of magnetic micro-calorimeters which we pursue at the Kirchhoff-Institut for Physics allows to develop detectors which exhibit not only a very high energy resolution but also a high quantum efficiency and an excellent linearity. Future applications of such detectors will include surface investigations via x-ray fluorescence analysis and spectroscopic measurements of cosmic x-ray sources (quasars, supernovae, black holes, … ) in satellite missions.

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