Highly sensitive superconducting circuits at ∼700 kHz with tunable quality 
factors for image-current detection of single trapped antiprotons

Nagahama, H.; Schneider Georg, G.; Mooser, A.; Smorra, C.; Sellner, S.; Harrington, J.; Higuchi, T.; Borchert, M.; Tanaka, T.; Besirli, M.; Blaum, Klaus; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S.

doi:10.1063/1.4967493

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Highly sensitive superconducting circuits at ∼700 kHz with tunable quality factors for image-current detection of single trapped antiprotons

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Harrington, J.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://dx.doi.org/10.1063/1.4967493
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Citation

Nagahama, H., Schneider Georg, G., Mooser, A., Smorra, C., Sellner, S., Harrington, J., et al. (2016). Highly sensitive superconducting circuits at ∼700 kHz with tunable quality factors for image-current detection of single trapped antiprotons. Review of Scientific Instruments, 87(11): 113305. doi:10.1063/1.4967493.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-BD64-5

Abstract

We developed highly sensitive image-current detection systems based on superconducting toroidal coils and ultra-low noise amplifiers for non-destructive measurements of the axial frequencies (550–800 kHz) of single antiprotons stored in a cryogenic multi-Penning-trap system. The unloaded superconducting tuned circuits show quality factors of up to 500 000, which corresponds to a factor of 10 improvement compared to our previously used solenoidal designs. Connected to ultra-low noise amplifiers and the trap system, signal-to-noise-ratios of 30 dB at quality factors of >20 000 are achieved. In addition, we have developed a superconducting switch which allows continuous tuning of the detector’s quality factor and to sensitively tune the particle-detector interaction. This allowed us to improve frequency resolution at constant averaging time, which is crucial for single antiproton spin-transition spectroscopy experiments, as well as improved measurements of the proton-to-antiproton charge-to-mass ratio.