Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Precision spectroscopy of atoms and ions (with Q)

A 35.25: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Towards future kilo-pixel x-ray detector arrays: SQUIDs and SQUID multiplexers for the readout of high-resolution x-ray detectors — •Mathias Wegner, Anna Ferring, Andreas Fleischmann, Loredana Gastaldo, Sebastian Kempf, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg University.

Calorimetric low-temperature particle detectors such as superconducting transition edge sensors, metallic magnetic calorimeters and magnetic penetration thermometers have proven to be suitable devices for performing high-resolution x-ray spectroscopy. They are therefore very frequently used for precision experiments in atomic and nuclear physics. To read out these kind of detectors, superconducting quantum interference devices (SQUIDs) are the devices of choice since they provide very low noise, a large system bandwidth and are compatible with sub-Kelvin operation temperatures. Driven by the need for devices that allow for the readout of future kilo-pixel x-ray detector arrays as well as of single-channel detectors with sub-eV energy resolution, we have recently started the development of low-Tc current-sensing SQUIDs. In particular, we are developing cryogenic frequency-domain multiplexers based on non-hysteretic rf-SQUIDs for array readout as well as dc-SQUIDs for single channel detector readout. We discuss our SQUID designs and the performance of prototype SQUIDs that are based on Nb/Al-AlOx/Nb Josephson junctions. We also outline that our SQUIDs might be very useful for other applications such as penning-trap mass spectroscopy due to their excellent noise performance.

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