Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Superconductivity: SQUIDs & Cryodetectors
TT 49.8: Vortrag
Mittwoch, 13. März 2013, 18:45–19:00, H21
maXs: Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy in Atomic Physics — •Daniel Hengstler1, Sönke Schäfer1, Christian Pies1, Sebastian Kempf1, Simon Uhl1, Sebastian Heuser1, Jeschua Geist1, Nadine Foerster1, Matthäus Krantz1, Emil Pavlov1, Sebastian Georgi2, Thomas Wolf1, Loredana Gastaldo1, Andreas Fleischmann1, and Christian Enss1 — 1Kirchhoff-Institut für Physik, Heidelberg — 2Max-Planck-Institut für Kernphysik, Heidelberg
We are presently developing the detector array maXs, which will allow for benchmark experiments in x-ray spectroscopy to challenge bound-state QED calculations. maXs will consist of 32 Metallic Magnetic Calorimeters (MMCs), operated at temperatures around 30 mK in a dry 3He/4He dilution refrigerator. In such a MMC the energy of an absorbed photon leads to an increase of the detector temperature accompanied by a change in magnetization of a paramagnetic temperature sensor which is detected by a SQUID-magnetometer. One fourth of the detectors of the array will have an energy resolution of 3 eV for photon energies up to 20 keV. Three fourth of the detectors are designed for the detection of photons with energies up to 200 keV with a resolution of 40 eV. We discuss how to minimize the thermal and electromagnetic crosstalk between the detectors and how to remove the heat that is produced within the two-dimensional array without degrading the energy resolution. We consider how to ensure equal detector response despite a position-dependent absorption of high energy photons. Furthermore we present latest results of present prototype arrays.