Phase-Sensitive Cyclotron Frequency Measurements at Ultralow Energies (original) (raw)
Related papers
2009
Experiments are performed on a single proton stored in a Penning trap aiming at the determination of the g-factor. The eigenmotion of an isolated, free proton could be detected electronically via coupling to a resonance circuit, which represents a non-destructive measurement. The free cyclotron frequency emerging from the measured eigenfre-quencies is one of two frequencies required for a direct determination of the magnetic moment. Design, developing, and commissioning of the experimental setup have been accomplished leading to a measuring accuracy of 10-7. The technical challenges for the determination of the second (Larmor) frequency arising from the smallness of the magnetic moment were mastered. Since the spin state required for this measurement is an internal degree of freedom, it can only be accessed through a coupling of the magnetic moment to the eigenmotion. A novel, hybrid Penning trap is presented, which im-prints the spin information onto the eigenmotion, thus, realizin...
Double Penning trap technique for precise g factor determinations in highly charged ions
European Physical Journal D, 2003
We present a detailed description of an experiment to determine the magnetic moment of an electron bound in hydrogen-like carbon. This forms a high-accuracy test of bound-state quantum electrodynamics. Special emphasis is given to the discussion of systematic uncertainties which limit our present accuracy. The described experimental setup may also be used for the determination of g factors in other highly charged ions.
Temperature measurement of a single ion in a Penning trap
European Physical Journal D, 2004
The present work is concerned with the association of a temperature to a single ion stored in a Penning ion trap. Several methods are described which allow to determine the temperature by measurements of the ion’s cyclotron and axial trapping frequencies. Recent results of a measurement on a hydrogen-like carbon ion 12C5 + by use of mode coupling are presented and possible further applications are discussed.
Direct Bound-Electron ggg factor Difference Measurement with Coupled Ions
2022
The quantum electrodynamic (QED) description of light-and-matter interaction is one of the most fundamental theories of physics and has been shown to be in excellent agreement with experimental results [1–6]. Specifically, measurements of the electronic magnetic moment (or g factor) of highly charged ions (HCI) in Penning traps can provide a stringent probe for QED, testing the Standard model in the strongest electromagnetic fields [7]. When studying the difference of isotopes, even the intricate effects stemming from the nucleus can be resolved and tested as, due to the identical electron configuration, many common QED contributions do not have to be considered. Experimentally however, this becomes quickly limited, particularly by the precision of the ion masses or the achievable magnetic field stability [8]. Here we report on a novel measurement technique that overcomes both of these limitations by cotrapping two HCIs in a Penning trap and measuring the difference of their g facto...
New Measurement of the Electron Magnetic Moment Using a One-Electron Quantum Cyclotron
Physical Review Letters, 2006
A new measurement resolves cyclotron and spin levels for a single-electron quantum cyclotron to obtain an electron magnetic moment, given by g=2 1:001 159 652 180 85 76 0:76 ppt. The uncertainty is nearly 6 times lower than in the past, and g is shifted downward by 1.7 standard deviations. The new g, with a quantum electrodynamics (QED) calculation, determines the fine structure constant with a 0.7 ppb uncertainty-10 times smaller than for atom-recoil determinations. Remarkably, this 100 mK measurement probes for internal electron structure at 130 GeV.
Developments for the direct determination of the g-factor of a single proton in a Penning trap
Hyperfine Interactions, 2009
The measurement and comparison of the magnetic moment (or g-factor) of the proton and antiproton provide a stringent experimental test of the CPTtheorem in the baryonic sector (Quint et al., Nucl Instrum Methods Phys Res, B 214:207, 2004). We present an experimental setup for the first direct high-precision measurement of the g-factor of a single isolated proton in a double cylindrical Penning trap. The application of the continuous Stern-Gerlach effect to detect quantum jumps between the two spin states of the particle, together with a novel trap design specially developed for this purpose, offers the possibility of measuring the magnetic moment not only of a single proton but also of a single antiproton. It is aimed to achieve a relative uncertainty of 10 −9 or better. Preliminary results including mass spectra of particle clouds as well as single proton preparation and detection are shown.
2011
The novel five-Penning trap mass spectrometer Pentatrap is developed at the Max-Planck-Institut für Kernphysik (MPIK), Heidelberg. Ions of interest are long-lived highly charged nuclides up to bare uranium. Pentatrap aims for an accuracy of a few parts in 10 12 for mass ratios of mass doublets. A physics program for Pentatrap includes Q-values measurements of β-transitions relevant for neutrino physics, stringent tests of quantum electrodynamics in the regime of extreme electric fields, and a test of special relativity. Main features of Pentatrap are an access to a source of highly charged ions, a multi-trap configuration, simultaneous measurements of frequencies, a continuous precise monitoring of magnetic field fluctuations, a fast exchange between different ions, and a highly sensitive cryogenic non-destructive detection system. This paper gives a motivation for the new mass spectrometer Pentatrap, presents its experimental setup, and describes the present status.
Absolute frequency measurement of the 40Ca+ 4s(2)S_(1/2)-3d(2)D_(5/2) clock transition
Physical review letters, 2009
We report on the first absolute transition frequency measurement at the 10;{-15} level with a single, laser-cooled 40Ca+ ion in a linear Paul trap. For this measurement, a frequency comb is referenced to the transportable Cs atomic fountain clock of LNE-SYRTE and is used to measure the 40Ca+ 4s ;{2}S_{1/2}-3d ;{2}D_{5/2} electric-quadrupole transition frequency. After the correction of systematic shifts, the clock transition frequency nu_{Ca;{+}}=411 042 129 776 393.2(1.0) Hz is obtained, which corresponds to a fractional uncertainty within a factor of 3 of the Cs standard. In addition, we determine the Landé g factor of the 3d;{2}D_{5/2} level to be g_{5/2}=1.200 334 0(3).