Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 28: Precision Spectroscopy V - highly charged ions (joint session A/Q)
A 28.2: Talk
Wednesday, March 7, 2018, 14:15–14:30, K 1.016
SIM-X: Silicon Microcalorimeters for X-ray Spectroscopy at Storage Rings - Status and Perspectives — •Pascal Andree Scholz1, Victor Andrianov2, Artur Echler3,4, Peter Egelhof3,4, Oleg Kiselev3, Saskia Kraft-Bermuth1, and Damian Müll1 — 1Justus Liebig University Giessen, Germany — 2Lomonosov Moscow State University, Russia — 3GSI Helmholtz Center, Germany — 4Johannes Gutenberg University Mainz, Germany
High-precision X-ray spectroscopy of highly-charged heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. However, one limitation of the current accuracy of such experiments is the energy resolution of available X-ray detectors. Due to their excellent energy resolution for X-ray energies around 100 keV, silicon microcalorimeters, based on silicon thermistors and tin absorbers, have already demonstrated their potential in previous experiments at the Experimental Storage Ring (ESR) of the GSI Helmholtz Center for Heavy Ion Research. Based on these experiments, a larger detector array with three times the active detector area in a cryogen-free cryostat equipped with a pulse tube cooler is currently in preparation. After a successful test experiment in june 2016 at the ESR with SIM-X, efforts in optimization and characterization concerning the thermal design and performance were made in order to improve the overall energy resolution and performance. In this presentation, we will present the current status of developments and perspectives in particular with respect to the next FAIR Phase 0 experiments.