@article{Völksen:2022:10.1063/5.0089182,
author = {Völksen, F and Devlin, JA and Borchert, MJ and Erlewein, SR and Fleck, M and Jäger, JI and Latacz, BM and Micke, P and Nuschke, P and Umbrazunas, G and Wursten, EJ and Abbass, F and Bohman, MA and Popper, D and Wiesinger, M and Will, C and Blaum, K and Matsuda, Y and Mooser, A and Ospelkaus, C and Smorra, C and Soter, A and Quint, W and Walz, J and Yamazaki, Y and Ulmer, S},
doi = {10.1063/5.0089182},
journal = {Rev Sci Instrum},
title = {A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range >180 kHz.},
url = {http://dx.doi.org/10.1063/5.0089182},
volume = {93},
year = {2022}
}

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TY  - JOUR
AB  - We describe a newly developed polytetrafluoroethylene/copper capacitor driven by a cryogenic piezoelectric slip-stick stage and demonstrate with the chosen layout cryogenic capacitance tuning of ≈60 pF at ≈10 pF background capacitance. Connected to a highly sensitive superconducting toroidal LC circuit, we demonstrate tuning of the resonant frequency between 345 and 685 kHz, at quality factors Q > 100 000. Connected to a cryogenic ultra low noise amplifier, a frequency tuning range between 520 and 710 kHz is reached, while quality factors Q > 86 000 are achieved. This new device can be used as a versatile image current detector in high-precision Penning-trap experiments or as an LC-circuit-based haloscope detector to search for the conversion of axion-like dark matter to radio-frequency photons. This new development increases the sensitive detection bandwidth of our axion haloscope by a factor of ≈1000.
AU  - Völksen,F
AU  - Devlin,JA
AU  - Borchert,MJ
AU  - Erlewein,SR
AU  - Fleck,M
AU  - Jäger,JI
AU  - Latacz,BM
AU  - Micke,P
AU  - Nuschke,P
AU  - Umbrazunas,G
AU  - Wursten,EJ
AU  - Abbass,F
AU  - Bohman,MA
AU  - Popper,D
AU  - Wiesinger,M
AU  - Will,C
AU  - Blaum,K
AU  - Matsuda,Y
AU  - Mooser,A
AU  - Ospelkaus,C
AU  - Smorra,C
AU  - Soter,A
AU  - Quint,W
AU  - Walz,J
AU  - Yamazaki,Y
AU  - Ulmer,S
DO  - 10.1063/5.0089182
PY  - 2022///
TI  - A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range >180 kHz.
T2  - Rev Sci Instrum
UR  - http://dx.doi.org/10.1063/5.0089182
UR  - https://www.ncbi.nlm.nih.gov/pubmed/36182508
VL  - 93
ER  - 

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