Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Superconductivity: Cryodetectors
TT 7.7: Vortrag
Montag, 31. März 2014, 11:00–11:15, HSZ 03
Current sensing SQUIDs for the readout of low impedance cryogenic particle detectors — •S. Kempf, A. Ferring, M. Wegner, A. Fleischmann, L. Gastaldo, and C. Enss — Kirchhoff-Institute for Physics, Heidelberg University.
Superconducting quantum interference devices (SQUIDs) are presently the most sensitive wideband devices for measuring various physical quantities that can be converted in magnetic flux. They are commonly used in measurement systems in which a very sensitive sensor or an ultra low noise wideband amplifier is required. A prominent example for the use of SQUIDs is the readout of low impedance cryogenic particle detectors (LTDs). Here, the SQUIDs are used as very fast current sensors that are compatible with the very low operation temperature of LTDs. Driven by the need for devices that are matched to state-of-the-art LTDs, we have recently started the development of low-Tc current sensing SQUIDs. In particular, we are developing cryogenic frequency-domain multiplexers that are based on non-hysteretic rf-SQUIDs as well as single channel dc-SQUIDs.
After a presentation of our multiplexer and dc-SQUID designs as well as our fabrication process that is based on selective Niobium etching, we will discuss the measured performance of both types of devices. We will show that the devices are operational and that their performance can be numerically predicted with confidence, thus allowing for a design optimization with respect to the readout requirements of low impedance LTDs. Finally, we outline future developments that are forseen to improve the noise performance of our devices.