Space-charge-based electrostatic plasma confinement involving relaxed plasma species

Pacheco, Jose L; Ordonez, C. A.; Weathers, D.L.

doi:10.1063/1.4764076

Cited by 12 publications

(14 citation statements)

References 41 publications

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“…The exact structure of the reflecting boundary used to confine an electron plasma along its edge was not considered in Ref. 16. A charged particle trap based on a cylindrical generalization of the planar ASB configuration considered here may lead to a method for confining a non-neutral plasma along the plasma's edge.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…16. The exact structure of the reflecting boundary used to confine an electron plasma along its edge was not considered in Ref.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…In Ref. 16 it was shown that if the properties of the two species can be tailored properly, there will be a region near the trap center in which the two species will overlap. A trap that employs an ASB to confine a positron plasma along its edge might be able to confine an antiproton plasma within the electrostatic well created by the space charge of the positrons.…”

Section: Introductionmentioning

confidence: 99%

“…16, the exact structure of the reflecting boundary used to confine an electron plasma along its edge was not considered. Here, the possibility of using an electrostatically plugged picket-fence configuration as a reflecting boundary is investigated via computer simulation.…”

Section: Introductionmentioning

confidence: 99%

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Charged particle reflection by a planar artificially structured boundary with electrostatic plugging

Hedlof

Ordonez

2017

AIP Advances

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A classical trajectory Monte Carlo simulation is used to investigate an artificially structured boundary for confinement and control of charged particles. The artificially structured boundary considered here incorporates a planar sequence of conducting wires, where adjacent wires carry current in opposite directions. Such a configuration creates a sequence of magnetic cusps and was studied previously [C. A. Ordonez, J. Appl. Phys. 106, 024905 (2009)]. The effect of introducing a sequence of electrodes for electrostatic plugging of the cusps is investigated. The results of the simulations are used to identify regions of parameter space in which particle losses through the cusps may be negligible in the single particle limit. A trap based on a cylindrical generalization of the artificially structured boundary presented here may lead to a method for confining non-neutral and partially neutralized plasmas along the edge, such that the bulk of a confined plasma is effectively free of externally applied electromagnetic fields.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…16. The exact structure of the reflecting boundary used to confine an electron plasma along its edge was not considered in Ref.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Charged particle reflection by a planar artificially structured boundary with electrostatic plugging

Hedlof

Ordonez

2017

AIP Advances

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“…Electrostatic potential profiles of non-neutral plasmas containing oppositely charged species have been previously computed using similar methods in multiple trap geometries with uniform magnetic fields 2,3 and no magnetic field. 4 The effects of incorporating magnetic mirrors on non-neutral plasma confinement in Penning traps have been studied analytically, 5 using particle-in-cell (PIC) simulations, 6,7 and experimentally. 5,7 The results from the current study show correspondence with the previous analytical and PIC results.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic equilibria of non-neutral plasmas confined in a Penning trap with axially varying magnetic field

Lane

Ordonez

2019

Physics of Plasmas

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A procedure for computing the electrostatic equilibria of non-neutral plasmas in a Penning trap with a nonuniform magnetic field by solving Poisson's equation using an iterative method is described. Plasma equilibria in a model Penning trap with high and low field regions are computed. The plasma is assumed to follow the Boltzmann density distribution along magnetic field lines. Correspondence with previous investigations examining similar configurations analytically and using particle-in-cell simulations is found. The relationship between the plasma density in low and high field regions is examined for various plasma temperatures, densities, magnetic mirror ratios, and plasma and electrode radii. An analytical description of the radial density profile in the high field region is developed and compared with the computed equilibria. A concept is described for cooling a positron plasma with laser-cooled ions trapped axially within a high magnetic field region, while antiprotons are trapped axially separated from the laser-cooled ions within a low field region, and the positron plasma extends to both regions.

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Artificially Structured Boundary for a high purity ion trap or ion source

Pacheco¹,

Ordonez²,

Weathers³

2014

Nuclear Instruments and Methods in Physics Research Section B:

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A plasma enclosed by an Artificially Structured Boundary (ASB) is proposed here as an alternative to existing ion source assemblies. In accelerator applications, many ion sources can have a limited lifetime or frequent service intervals due to sputtering and eventual degradation of the ion source assembly. Ions are accelerated towards the exit canal of positive ion sources, whereas, due to the biasing scheme, electrons or negative ions are accelerated towards the back of the ion source assembly. This can either adversely a↵ect the experiment in progress due to sputtered contamination or compromise the integrity of the ion source assembly. Charged particle trajectories in the proximity of an ASB experience electromagnetic fields that are designed to hinder ion-surface interactions. Away from the ASB there is an essentially field free region. The field produced by an ASB is considered to consist of a periodic sequence of electrostatically plugged magnetic field cusps. A classical trajectory Monte Carlo simulation is extended to include electrostatic plugging of magnetic field cusps. The conditions necessary for charged particles to be reflected by the ASB are presented and quantified in terms of normalized parameters.

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Space-charge-based electrostatic plasma confinement involving relaxed plasma species

Cited by 12 publications

References 41 publications

Charged particle reflection by a planar artificially structured boundary with electrostatic plugging

Charged particle reflection by a planar artificially structured boundary with electrostatic plugging

Electrostatic equilibria of non-neutral plasmas confined in a Penning trap with axially varying magnetic field

Artificially Structured Boundary for a high purity ion trap or ion source

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