Superconducting resonator and a cryogenic GaAs field-effect transistor amplifier as a single-ion detection system

Jefferts, Steven R.; Heavner, Thomas P.; Hayes, P R; Dunn, G. H.

doi:10.1063/1.1144153

Cited by 22 publications

(10 citation statements)

References 4 publications

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“…Figure 1 shows a schematic of the basic detection system commonly used in most single particle Penning trap experiments. For amplification of the tiny signals, superconducting quantum interference devices 10 and low noise GaAs field effect transistors ͑FETs͒ [11][12][13][14] are used. A crucial part of all these nondestructive detection devices is a coil with an inductance L in a metal shielding.…”

Section: Introductionmentioning

confidence: 99%

The quality factor of a superconducting rf resonator in a magnetic field

Ulmer¹,

Kracke²,

Blaum³

et al. 2009

Review of Scientific Instruments

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The quality factor of a superconducting NbTi resonator at 1.6 MHz in a magnetic field up to 1.2 T as well as its temperature dependence is investigated. A hysteresis effect in the superconducting surface resistance as a function of the magnetic field is observed. An unloaded Q-value of the resonator of 40,500 is achieved at 3.9 K. It is shown that this Q-value is limited by dielectric losses in the FORMVAR insulation of the coils wire. The details of the Q-value optimization are discussed. In the temperature dependence of the Q-value a steep decrease is observed above T approximately = 7.5 K. Finally, the implications of these measurements for real trap experiments are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

The quality factor of a superconducting rf resonator in a magnetic field

Ulmer¹,

Kracke²,

Blaum³

et al. 2009

Review of Scientific Instruments

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show abstract

“…This method is being used successfully in precision mass spectrometry using Penning traps [15,16]. Nondestructive detection can be realized either by laserinduced fluorescence when the particle has a suitable [17] energy level scheme, or by the image currents induced in the trap electrodes by the ion's oscillation [18][19][20][21]. Since this method is applied in all experiments discussed below, we will exclusively consider it here.…”

Section: Trapped Particle Detectionmentioning

confidence: 99%

Electron g‐factor determinations in Penning traps

2013

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The magnetic moment of the electron, expressed by the g-factor in units of the Bohr magneton, is a key quantity in the theory of quantum electrodynamics (QED). Experiments using single particles confined in Penning traps have provided very precise values of the g-factor for the free electron as well as the electron bound in hydrogen-like ions. In this paper the status of these experiments is reviewed. The results allow testing calculations of higher order Feynman diagrams. Comparison of experimental and theoretical results for free and bound particles show no discrepancy within the limits of error, thus representing to date the most sensitive test of QED. Moreover, the g-factor provides a unique access to fundamental constants, as e.g. the electron mass or the fine structure constant.

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“…The implementation of the detection LC-circuit and required amplifiers is independent of the used trap. It is discussed, for instance, in [33,34]. Fig.…”

Section: Impedance Of the Particle + Lc-circuitmentioning

confidence: 98%

Electronic detection of a single particle in a coplanar-waveguide Penning trap

AL-Rjoub

Verdú

2012

Appl. Phys. B

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We present a detailed model of the electronic detection of a single particle in a coplanar-waveguide Penning trap. The detection signal is the electric current induced upon the trap's surface by the charged particle's motion. In contrast to three-dimensional hyperbolic or cylindrical traps, the cyclotron and magnetron motions can be detected, excited or coupled to the axial motion without segmenting any of the trap's electrodes. We calculate the effective coupling displacement for different electrodes. This determines the detection signal and resistive cooling time constant for each component of the ion's motion. We discuss the practical implementation of the electronic detection for a single electron and a single proton.

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Superconducting resonator and a cryogenic GaAs field-effect transistor amplifier as a single-ion detection system

Cited by 22 publications

References 4 publications

The quality factor of a superconducting rf resonator in a magnetic field

The quality factor of a superconducting rf resonator in a magnetic field

Electron g‐factor determinations in Penning traps

Electronic detection of a single particle in a coplanar-waveguide Penning trap

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