Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity: Cryodedetectors & Cryotechnique

TT 33.1: Vortrag

Dienstag, 8. März 2016, 14:00–14:15, H19

Performance and readout of state-of-the-art MMC detector arrays — •M. Wegner, D. Hengstler, J. Geist, M. Keller, M. Krantz, C. Schötz, S. Kempf, L. Gastaldo, A. Fleischmann, and C. Enss — Kirchhoff-Institute for Physics, Heidelberg University

Metallic magnetic calorimeters (MMCs) are energy dispersive particle detectors which have a very good energy resolution, a large dynamic range as well as an excellent linearity. An MMC operates at millikelvin temperatures and converts the energy of an incoming particle into a rise of temperature of an absorber and an attached paramagnetic temperature sensor. The resulting change of sensor magnetization is read out by a SQUID and serves as a measure for the energy input.

One of our goals is the development of large detector arrays to provide a large detection area for low-rate applications, to cope with a significantly increased count rate or to provide imaging capabilities. For this, we have developed several medium-scale detector arrays which are optimized for x-rays up to 20, 30 and 200 keV, respectively. They have a resolving power E/Δ E above 1500 and are read out using individual dc-SQUIDs. To account for the readout of very large arrays with up to 1000 detectors, we develop a cryogenic frequency domain multiplexer which enables the readout of such large arrays using only one HEMT amplifier and two coaxial cables.

In this contribution we present our micro fabricated detector arrays and discuss their performance in the field of high resolution X-ray spectroscopy. In addition we show for the very first time a simultaneous readout of MMCs using our cryogenic multiplexer.