Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Measuring Devices, Cryotechnique: Poster Session
TT 10.7: Poster
Monday, March 22, 2010, 14:00–18:00, Poster A
Multipurpose filter for high-resolution electronic measurements at very low temperatures — •Hans-Fridtjof Pernau1, Christian Schirm1, Christian Debuschewitz2, and Elke Scheer1 — 1Department of Physics, University of Konstanz, D-78457 Konstanz, Germany — 2Attocube Systems, Munich, Germany
Low-temperature transport measurements with high energy resolution require effective filtering of high-frequency input and an optimized thermal link between the electronic system and the thermal bath. Standard RC filters built from SMD or other discrete electronic elements provide a very sharp filtering characteristic. However, with those devices it is difficult to hinder crosstalk between in- and output. Their high dc resistance and restricted contact area results in considerable heat input. Furthermore the elevated dc resistance hampers measurements with high currents or voltages. We developed compact and reliable filters based on the filter concept presented by Martinis, Devoret and Clarke in 1987 [1] which we adapted to various purposes and shapes and to fit into almost every cryostat system. We present the manufacturing procedure, the filtering properties together with examples of implementations of our homemade copper and stainless steel powder filters which are used down to 10 mK.
[1] J.M. Martinis, M.H. Devoret and J. Clarke, Phys. Rev. B 35, 4682 (1987)