Regensburg 2019 – wissenschaftliches Programm

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

TT: Fachverband Tiefe Temperaturen

TT 67: Cryogenic Particle Detectors and Other Superconducting Electronics

TT 67.7: Vortrag

Freitag, 5. April 2019, 11:00–11:15, H4

Efficient Filter Solutions for Frequency Demultiplexing of Microwave-SQUID coupled Metallic Magnetic Calorimeters — •Nick Karcher, Oliver Sander, and Marc Weber — Karlsruhe Institute for Technology, Eggenstein-Leopoldshafen, Germany

For the Electron Capture in Ho¹⁶³ (ECHo) experiment, metallic magnetic calorimeters deliver the required energy resolution of ≤ 5 eV for the Holmium decay energy spectrum. To gather the statistics for the spectrum 12000 calorimeters are planned. Microwave SQUID multiplexing can be used to connect several hundred metallic magnetic calorimeters via a single coax pair to a room temperature DAQ system.

We will show an FPGA based software-defined radio DAQ system which can generate the required stimulation frequency comb and is capable of processing the sensor modulated signals. The multiplex bandwidth of a channel is between 4 – 8 GHz with a complex baseband of 800 MHz. It relies on five 1 GS/s, 16 Bit DA and 14 Bit AD converters. For a large number of channels (>100) the necessary channelization hardware resources within the FPGA drives the cost. We will present a novel channelization scheme. Compared to a purely digital down conversion (DDC) based solution it reduces the required resources by almost 85% by utilizing a combination of poly-phase filtering, and DDC at a clock rate of 500 MHz.