2016/11/01 by H. Nagahama, G. Schneider, A. Mooser +14
Physics and Astronomy · #Amplifier #Antiproton #Atomic and Subatomic Physics Research #Cryogenics #Dark Matter and Cosmic Phenomena #Electronic circuit #Noise (video) #Particle physics theoretical and experimental studies #Quality (philosophy) #Solenoidal vector field #Superconductivity #physics.ins-det
paper · pdf · doi:10.1063/1.4967493
87 (2016) 113305
openalex publication_date 2016/11/01 · openalex created_date 2016/11/30 · arxiv created 2016/12/27 · arxiv updated 2016/12/28 · openalex updated_date 2026/08/05
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.