Electronic detection of charged particle effects in a Penning trap

Winters, D.; Vogel, Manuel; Segal, D. M.; Thompson, R. C.

doi:10.1088/0953-4075/39/14/019

Cited by 33 publications

(34 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…However, the confinement time is finite due to several reasons that include collisions with the surrounding neutrals, anharmonicities in the trap potential induced by deviations from the ideal geometry of the trap, and in situations involving a large number of charged particles, space charge effects in the trap [5]. Inhomogeneity in the external magnetic fields in case of Penning traps is an additional perturber and contributes to loss of ions [1,6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…An equilibrium is then set up between the trapping forces, the Coulomb repulsion between the ions, and the centripetal force that leads to a number density given by the following expression [20,21,8]:…”

Section: Crystal Rotationmentioning

confidence: 99%

Theory and simulation of ion Coulomb crystal formation in a Penning trap

2013

View full text Add to dashboard Cite

Ion Coulomb crystals (ICC) are formed by laser-cooled ions in both radio-frequency and Penning traps. In radio-frequency traps the crystals are generally stationary. In Penning traps ICC always rotate. The frequency of rotation is often set by an applied rotating wall drive which forces the crystal to rotate at the same frequency as the drive. In the absence of any applied rotating or oscillating fields, ICC in a Penning trap can be in stable equilibrium with a range of rotation frequencies. The density and shape of the crystal adjusts with the rotation frequency to ensure that equilibrium is reached. Here we show that the parameters of the radial laser cooling beam determine the rotation frequency of a small crystal in a Penning trap when no driving fields are present. We demonstrate, using an approximate theoretical treatment and realistic simulations, that the crystal rotation frequency is independent of the number of ions and the trap parameters, so long as the crystal radius remains smaller than the cooling laser beam waist. As the rotation frequency increases, the crystal eventually becomes a linear string, at which point it is no longer able to adjust its density. Instead, a small amplitude vibration in the zigzag mode of oscillation manifests itself as a rotation of the crystal at a fixed frequency that depends only on the applied trap potential.

show abstract

“…Past theoretical studies [10][11][12][13] have investigated resistive and sympathetic cooling [1,2,14,15] of highly charged ions under these conditions, but the interpretation of the sparse existing data is still subject of lively discussion. More data is required to validate simulations and assist in designing future experiments.…”

Section: Introductionmentioning

confidence: 99%

Resistive and sympathetic cooling of highly-charged-ion clouds in a Penning trap

et al. 2014

View full text Add to dashboard Cite

We present measurements of resistive and sympathetic cooling of ion clouds confined in a Penning trap. For resistive cooling of a cloud consisting of one ion species, we observe a significant deviation from exponential cooling behaviour which is explained by an energy-transfer model. The observed sympathetic cooling of simultaneously confined ion species shows a quadratic dependence on the ion charge state and is hence in agreement with expectations from the physics of dilute non-neutral plasmas.

show abstract

Electronic detection of charged particle effects in a Penning trap

Cited by 33 publications

References 21 publications

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

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

Theory and simulation of ion Coulomb crystal formation in a Penning trap

Resistive and sympathetic cooling of highly-charged-ion clouds in a Penning trap

Contact Info

Product

Resources

About