A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range > 180 kHz

authored by
F. Völksen, J. A. Devlin, M. J. Borchert, S. R. Erlewein, M. Fleck, J. I. Jäger, B. M. Latacz, P. Micke, P. Nuschke, G. Umbrazunas, E. J. Wursten, F. Abbass, M. A. Bohman, D. Popper, M. Wiesinger, C. Will, K. Blaum, Y. Matsuda, A. Mooser, C. Ospelkaus, C. Smorra, A. Soter, W. Quint, J. Walz, Y. Yamazaki, S. Ulmer
Abstract

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.

Organisation(s)
Institute of Quantum Optics
QuantumFrontiers
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s)
GSI Helmholtz Centre for Heavy Ion Research
National Metrology Institute of Germany (PTB)
Max Planck Institute for Nuclear Physics
University of Tokyo
ETH Zurich
Johannes Gutenberg University Mainz
CERN
Ulmer Fundamental Symmetries Laboratory
Helmholtz-Institut Mainz
Type
Article
Journal
Review of scientific instruments
Volume
93
ISSN
0034-6748
Publication date
09.2022
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Instrumentation
Electronic version(s)
https://doi.org/10.1063/5.0089182 (Access: Open)