Finite length thermal equilibria of a pure electron plasma column

Prasad, S.; O’Neil, T. M.

doi:10.1063/1.862578

Cited by 152 publications

(80 citation statements)

References 4 publications

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“…1,2,3 A mirror field has been suggested to cause transport in such traps 1 . Thermal equilibrium in Malmberg-Penning traps has been studied 4 , but without a detailed analysis of mirror fields.…”

Section: Introductionmentioning

confidence: 99%

Simulation studies of non-neutral plasma equilibria in an electrostatic trap with a magnetic mirror

et al. 2007

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The equilibrium of an infinitely long, strongly magnetized, non-neutral plasma confined in a Penning-Malmberg trap with an additional mirror coil has been solved analytically [J. Fajans, Phys. Plasmas 10, 1209 (2003)] and shown to exhibit unusual features. Particles not only reflect near the mirror in the low field region, but also may be weakly trapped in part of in the high field region.The plasma satisfies a Boltzmann distribution along field lines; however, the density and the potential vary along field lines. Some other simplifying assumptions were employed in order to analytically characterize the equilibrium; for example the interface region between the low and high field regions was not considered. The earlier results are confirmed in the present study, where two-dimensional particle-in-cell simulations are performed with the Warp code in a more realistic configuration with an arbitrary (but physical) density profile, realistic trap geometry and magnetic field. A range of temperatures and radial plasma sizes are considered. Particle tracking is used to identify populations of trapped and untrapped particles. The present study also shows that it is possible to obtain local equilibria of non-neutral plasmas using a collisionless PIC code, by a scheme that uses the inherent numerical collisionality as a proxy for physical collisions.2

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Section: Introductionmentioning

confidence: 99%

Simulation studies of non-neutral plasma equilibria in an electrostatic trap with a magnetic mirror

et al. 2007

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“…Equations (25) and (28) constitute a system of nonlinear equations for the potential φ, the Poisson-Boltzmann system, that can be solved uniquely (Prasad and O'Neil, 1979) for given values of the rotation frequency, the temperature, the constant C (determined in terms of the other constants and the total particle number N ) and given boundary conditions for φ specified by the voltages applied to the confinement electrodes.…”

Section: B Finite Temperature Effects and Thermal Equilibriamentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

216

217

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In recent years, there has been a wealth of new science involving low-energy antimatter (i.e., positrons and antiprotons) at energies ranging from 10 2 to less than 10 −3 eV. Much of this progress has been driven by the development of new plasma-based techniques to accumulate, manipulate and deliver antiparticles for specific applications. This article focuses on the advances made in this area using positrons. However many of the resulting techniques are relevant to antiprotons as well. An overview is presented of relevant theory of single-component plasmas in electromagnetic traps. Methods are described to produce intense sources of positrons and to efficiently slow the typically energetic particles thus produced. Techniques are described to trap positrons efficiently and to cool and compress the resulting positron gases and plasmas. Finally, the procedures developed to deliver tailored pulses and beams (e.g., in intense, short bursts, or as quasi-monoenergetic continuous beams) for specific applications are reviewed. The status of development in specific application areas is also reviewed. One example is the formation of antihydrogen atoms for fundamental physics [e.g., tests of invariance under charge conjugation, parity inversion and time reversal (the CPT theorem), and studies of the interaction of gravity with antimatter]. Other applications discussed include atomic and materials physics studies and study of the electron-positron many-body system, including both classical electron-positron plasmas and the complementary quantum system in the form of Bose-condensed gases of positronium atoms. Areas of future promise are also discussed. The review concludes with a brief summary and a list of outstanding challenges.

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“…One can show that in the cold fluid limit, a singly-charged sample in a harmonic potential has a uniform density [27], bound by an ellipsoid of revolution where the density falls to zero on the scale of the Debye length.…”

Section: Transfer Efficiency For Large Ion Clouds a Estimation mentioning

confidence: 99%

Fast and efficient transport of large ion clouds

et al. 2015

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The manipulation of trapped charged particles by electric fields is an accurate, robust and reliable technique for many applications or experiments in high-precision spectroscopy. The transfer of the ion sample between multiple traps allows the use of a tailored environment in quantum information, cold chemistry, or frequency metrology experiments. In this article, we experimentally study the transport of ion clouds of up to 50 000 ions. The design of the trap makes ions very sensitive to any mismatch between the assumed electric potential and the actual local one. Nevertheless, we show that being fast (100 µs to transfer over more than 20 mm) increases the transport efficiency to values higher than 90 %, even with a large number of ions. For clouds of less than 2000 ions, a 100 % transfer efficiency is observed.

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Finite length thermal equilibria of a pure electron plasma column

Cited by 152 publications

References 4 publications

Simulation studies of non-neutral plasma equilibria in an electrostatic trap with a magnetic mirror

Simulation studies of non-neutral plasma equilibria in an electrostatic trap with a magnetic mirror

Plasma and trap-based techniques for science with positrons

Fast and efficient transport of large ion clouds

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