Mainz 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 20: Poster Session I
A 20.37: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1
High-precision X-ray spectroscopy of highly-charged ions at storage rings using silicon microcalorimeters — •Damian Müll1, Artur Echler2,3, Saskia Kraft-Bermuth1, and Pascal Scholz1 — 11. Physikalisches Institut, Justus-Liebig-Universität, Giessen, Germany — 2GSI Helmholtz Center, Darmstadt, Germany — 3Institute of Physics, Johannes-Gutenberg University, 55099 Mainz, Germany
The precise determination of the energy of the Lyman-α lines in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. Silicon microcalorimeters, which detect the X-ray energy as heat rather than by charge production, have already demonstrated their potential to improve the precision of such experiments due to their excellent energy resolution for X-ray energies around 100 keV. The application of microcalorimeters for hard X-rays, based on silicon thermistors and tin absorbers, has been pursued by our collaborating groups for more than two decades. Two detector arrays have been successfully applied in two experiments at the Experimental Storage Ring (ESR) of the GSI Helmholtz Center for Heavy Ion Research. In order to improve the energy resolution, parts of the electronics have to be changed. In this contribution the results of measurements on the characteristics of the junction field transistors, implemented on a newly designed printed circuit board, will be presented.