Ion density limitation in a Penning trap due to the combined effect of asymmetry and space charge

Yu, J. H.; Desaintfuscien, M.; Plumelle, F.

doi:10.1007/bf00694417

Cited by 22 publications

(15 citation statements)

References 9 publications

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“…This couples radial and axial degrees of freedom and may lead to loss of confinement. Such resonant ion loss at critical ion number densities has been observed experimentally [28]. However, it has not been observed in our setup.…”

Section: Resonant Ion Loss Mechanismssupporting

confidence: 55%

Dynamics of laser-cooled Ca+ ions in a Penning trap with a rotating wall

et al. 2012

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We have performed systematic measurements of the dynamics of laser-cooled 40 Ca + ions confined in a Penning trap and driven by a rotating dipole field ('rotating wall'). The trap used is a copy of the one used in the SPEC-TRAP experiment located at the HITRAP facility at GSI, Germany. The size and shape of the ion cloud has been monitored using a CCD camera to image the fluorescence light resulting from excitation by the cooling laser. We have varied the experimental conditions such as amplitude and frequency of the rotating wall drive as well as the trapping parameters. The rotating wall can be used for a radial compression of the ion cloud thus increasing the ion density in the trap. We have also observed plasma mode excitations in agreement with theoretical expectations. This work will allow us to define the optimum parameters for high compression of the ions as needed for precision spectroscopy of forbidden transitions.

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Section: Resonant Ion Loss Mechanismssupporting

confidence: 55%

Dynamics of laser-cooled Ca+ ions in a Penning trap with a rotating wall

et al. 2012

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“…The confinement time departs from the B 2 dependence that is expected for a few particles confined in harmonic traps. Here, an electron plasma of a few eV energy and density of 10 15 m −3 is trapped and this situation enhances space charge effects on the individual electron's degrees of freedom [5,33,35]. For a quadrupole Penning trap, we report a τ dependence ∝ B 1.41±0.04 .…”

Section: Resultsmentioning

confidence: 81%

Dependence of the confinement time of an electron plasma on the magnetic field in a quadrupole Penning trap

et al. 2017

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A quadrupole Penning trap is used to confine electrons in weak magnetic fields. Perturbations due to space charge and imperfections in the trap geometry, as well as collisions with the background gas molecules, lead to loss of the electrons from the trap. We present in this work the results on measurements of the electron confinement time and its dependence on the magnetic field in a quadrupolar Penning trap. We describe a method to measure the confinement time of an electron cloud under weak magnetic fields (0.01 T -0.1 T). This time is found to scale as τ ∝ B 1.41 in variance with the theoretically expected confinement time that scales as τ ∝ B 2 for trapped electrons that are lost through collisions with the neutrals present in the trap. A measurement of the expansion rate of the electron plasma in the trap through controlled variation of the trap voltage, yields expansion times that depend on the energy of escaping electrons. This is found to vary in our case in the scaling range B 0.32 to B 0.43 . Distorting the geometry of the trap, results in a marked change in the confinement time's dependence on the magnetic field. The results indicate that the confinement time of the electron cloud in the trap is limited by both, effects of collisions and perturbations that result in the plasma loss through expansion in the trap.

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“…For optical spectroscopy this also means that the Lamb-Dicke regime can be reached without sophisticated cooling methods simply by resistive cooling around liquid helium temperature [46]. Similar measurements are possible also with coherent ensembles of ions as long as the space charge effect [74,75] is negligible.…”

Section: How To Measure Magnetic Field Gradientsmentioning

confidence: 99%

Switchable magnetic bottles and field gradients for particle traps

et al. 2013

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Versatile methods for the manipulation of individual quantum systems, such as confined particles, have become central elements in current developments in precision spectroscopy, frequency standards, quantum information processing, quantum simulation, and alike. For atomic and some subatomic particles, both neutral and charged, a precise control of magnetic fields is essential. In this paper, we discuss possibilities for the creation of specific magnetic field configurations which find application in these areas. In particular, we pursue the idea of a magnetic bottle which can be switched on and off by transition between the normal and the superconducting phase of a suitable material in cryogenic environments, for example in trap experiments in moderate magnetic fields. Methods for a fine-tuning of the magnetic field and its linear and quadratic components in a trap are presented together with possible applications.

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Ion density limitation in a Penning trap due to the combined effect of asymmetry and space charge

Cited by 22 publications

References 9 publications

Dynamics of laser-cooled Ca+ ions in a Penning trap with a rotating wall

Dynamics of laser-cooled Ca+ ions in a Penning trap with a rotating wall

Dependence of the confinement time of an electron plasma on the magnetic field in a quadrupole Penning trap

Switchable magnetic bottles and field gradients for particle traps

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