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

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$\sim$800kHz) of single antiprotons stored in a cryogenic multi-Penning-trap system. The unloaded superconducting tuned circuits show quality factors of up to 500000, 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 30dB at quality factors of > 20000 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.

87 (2016) 113305

References in corpus (3)

• High-precision measurement of the atomic mass of the electron
• g factor of lithiumlike silicon 28Si11+
• Direct high-precision measurement of the magnetic moment of the proton

Cited by in corpus (7)

• Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
• High-precision mass spectrometer for light ions
• Sympathetic cooling of a trapped proton mediated by an LC circuit
• Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trap
• Observation of individual spin quantum transitions of a single antiproton
• Sympathetic cooling schemes for separately trapped ions coupled via image currents
• Switchable Damping for a One-Particle Oscillator