6533b850fe1ef96bd12a83ef
RESEARCH PRODUCT
Highly sensitive superconducting circuits at ∼700 kHz with tunable quality factors for image-current detection of single trapped antiprotons
H. NagahamaM. BorchertJochen WalzYasuyuki MatsudaTakahiro TanakaM. BesirliYasunori YamazakiG. SchneiderA. MooserKlaus BlaumWolfgang QuintTakashi HiguchiChristian SmorraStefan UlmerS. SellnerJ. HarringtonChristian OspelkausChristian Ospelkaussubject
SuperconductivityPhysicsSpeichertechnik - Abteilung BlaumPhysics - Instrumentation and DetectorsSolenoidal vector fieldbusiness.industryAmplifierDetectorFOS: Physical sciencesInstrumentation and Detectors (physics.ins-det)01 natural sciencesNoise (electronics)010305 fluids & plasmasQuality (physics)Antiproton0103 physical sciencesOptoelectronicsDetectors and Experimental Techniques010306 general physicsbusinessphysics.ins-detInstrumentationElectronic circuitdescription
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$800$\,$kHz) of single antiprotons stored in a cryogenic multi-Penning-trap system. The unloaded superconducting tuned circuits show quality factors of up to 500$\,$000, which corresponds to a factor of 10 improvement compared to our previously used solenoidal designs. Connected to ultra-low noise amplifiers and the trap system, signal-to-noise-ratios of 30$\,$dB at quality factors of > 20$\,$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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-12-26 |