Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 34: Precision spectroscopy of atoms and ions II (with Q)
A 34.6: Talk
Thursday, March 3, 2016, 12:30–12:45, f428
A large array of microcalorimeters for high-precision X-ray spectroscopy — •Pascal Scholz1, Victor Andrianov2, and Saskia Kraft-Bermuth1 — 1Justus-Liebig-Universität, Gießen, Germany — 2Lomonosov Moscow State University, Moscow, Russia
High-precision X-ray spectroscopy of highly-charged heavy ions, commonly performed at storage rings, provides a sensitive test of quantum electrodynamics. 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.
To improve their performance with respect to statistical as well as systematic uncertainties, a large array of silicon microcalorimeters for high-precision X-ray spectroscopy, especially optimized for experiments at storage rings, has now been designed. With an active area of about 100 mm2, it will be the largest microcalorimeter array currently available for storage ring experiments. In addition, the large dynamic range will allow the intrinsic determination of the Doppler correction, which is a prominent source of systematic uncertainty in such experiments. The presentation will introduce the detection principle, present the new detector design as well as first tests of performance, and discuss potential applications.