Observation of transport to thermal equilibrium in pure electron plasmas

Driscoll, C. F.; Malmberg, J. H.; Fine, K. S.

doi:10.1103/physrevlett.60.1290

Cited by 122 publications

(90 citation statements)

References 20 publications

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“…However, recent experiments have observed collisional transport that is much larger than the classical theory predicts. Test particle diffusion is ten times larger than classical theory [5,6]; thermal transport is up to 300 times larger and is independent of magnetic field strength [7][8][9]; and viscosity is up to 10 4 larger, and actually increases rather than decreases with magnetic field strength [10,11]. Note that the enhanced transport is not due to turbulent fluctuations; the nonneutral plasmas are very quiescent.…”

Section: Introductionmentioning

confidence: 94%

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Collisional transport in non-neutral plasmas

Dubin

1998

Physics of Plasmas

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Classical transport theory grossly underestimates collisionally-driven cross-field transport for plasmas in the parameter regime of r cIn current experiments operating in this regime, cross-field test particle transport is observed to be a factor of 10 larger than the prediction of classical theory. Heat conduction is enhanced by up to 300 times over classical theory, and viscosity is up to 10 4 times larger. New guiding center theories of transport due to long-range collisions have been developed that agree with the measurements. Theory also predicts that emission and absorption of plasma waves may further enhance the thermal conduction and viscosity, providing a possible mechanism for anomalous thermal conductivity in the electron channel of fusion plasmas.

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Section: Introductionmentioning

confidence: 94%

“…In order to save space we do not consider the plasma viscosity in detail. Interested readers are directed to the references [ 8,10,11,13,14].…”

Section: Introductionmentioning

confidence: 99%

Collisional transport in non-neutral plasmas

Dubin

1998

Physics of Plasmas

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“…16,17 A modified model has been recently proposed in order to account for the radial variation of the equilibrium length of the system. 18 Here we neglect all these effects and focus our attention on a new numerical approach that addresses the dynamics of a pure electron plasma in the limit where it is isomorphic to a 2D inviscid fluid.…”

Section: Introductionmentioning

confidence: 99%

Motion of extended vortices in an inhomogeneous pure electron plasma

et al. 2000

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The motion of extended vortices in a pure electron plasma with an inhomogeneous, centrally peaked, density in a Penning–Malmberg trap is studied by means of a two-dimensional electrostatic Eulerian code that solves the evolution equation for the electron distribution function in the guiding center approximation, coupled to the Poisson equation for the electrostatic potential. Vortices corresponding to electron density clumps propagate inward, as discussed in a recently proposed model for the case of point vortices, and carry inward both high and low density plasma. New, long-lived, structures consisting of a higher and of a lower density vortex pair are formed in the presence of a small amount of vorticity reconnection

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“…The technique is not limited to linear Paul traps, but should work as well in any open structured trap geometries such as e.g. the Penning-Malmberg type traps [11,23].Previous Doppler velocimetry imaging experiments with cold magnetized plasmas of Be + ions in a Penning trap have led to the identification of a series of normal modes [11][12][13], which correlate to specific (l, m)-modes theoretically predicted for spheroidal shaped uniformly charged liquids [24]. For the cold unmagnetized plasmas in the linear Paul trap used in our investigations, the corresponding low-order normal mode frequencies are expected to be close to those of the (l, m) modes, which are given by [24] …”

mentioning

confidence: 99%

“…The technique is not limited to linear Paul traps, but should work as well in any open structured trap geometries such as e.g. the Penning-Malmberg type traps [11,23].…”

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confidence: 99%

Noninvasive Vibrational Mode Spectroscopy of Ion Coulomb Crystals through Resonant Collective Coupling to an Optical Cavity Field

et al. 2010

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We report on a novel non-invasive method to determine the normal mode frequencies of ion Coulomb crystals in traps based on the resonance enhanced collective coupling between the electronic states of the ions and an optical cavity field at the single photon level. Excitations of the normal modes are observed through a Doppler broadening of the resonance. An excellent agreement with the predictions of a zero-temperature uniformly charged liquid plasma model is found. The technique opens up for investigations of the heating and damping of cold plasma modes, as well as the coupling between them.PACS numbers: 37.30.+i,52.27.Gr,37.10. Vz,52.27.Jt,42.50.Pq Cold one-component plasma physics [1] has in the past two decades led to a series of interesting results due to the availability of fast computers [2][3][4][5] as well as the possibility to experiment with ensembles of trapped, lasercooled atomic ions [6][7][8][9][10][11][12][13][14][15][16]. Prominent examples are the understanding of structural properties of crystallized cold plasmas in both Penning [6,7] and Paul [8-10, 15, 16] traps, and the investigation of the normal mode dynamics of cold magnetized plasmas in Penning traps [11][12][13][14]. While there exist many similarities between experiments in Penning and Paul traps, the unmagnetized plasmas in Paul traps are e.g. known to heat up much faster than the magnetized plasmas in Penning traps due to the presence of the rf fields [3,17]. The lack of a rotational symmetry axis in Paul traps has as well been found to be responsible for the observation of specific crystalline structures [16]. Exploration of the normal mode dynamics of unmagnetized ion Coulomb crystals in e.g. linear Paul traps will hence add to our understanding of the influence of the trapping environment on the physics of such crystals. Furthermore, since large Coulomb crystals are excellent candidates for the realization of high-fidelity quantum memories for light [18], such studies can shed light on the influence of the excitation of these modes on the fidelity as well as on the prospect of storing several photonic quantum bits through deliberate excitations of specific vibrational modes. Larger Coulomb crystals have as well recently been considered as a system for performing quantum simulations, in which respect knowledge of normal mode dynamics is needed [19]. Finally, ion Coulomb crystals represent extremely interesting systems to study cavity optomechanics phenomena [20,21], since, in spite of their solid nature, they possess free atomic resonance properties and can hence be made very sensitive to the radiation pressure force exerted by optical fields.In this Letter, we report on the study of normal mode vibrations of Coulomb crystals of 40 Ca + ions in a linear Paul trap by a novel non-invasive technique. The technique is based on monitoring the coherent collective resonant response of the atomic ions constituting the crystal to a single photon optical cavity field [18]. By having a standing wave optical cavity incorporated in the tr...

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Observation of transport to thermal equilibrium in pure electron plasmas

Cited by 122 publications

References 20 publications

Collisional transport in non-neutral plasmas

Collisional transport in non-neutral plasmas

Motion of extended vortices in an inhomogeneous pure electron plasma

Noninvasive Vibrational Mode Spectroscopy of Ion Coulomb Crystals through Resonant Collective Coupling to an Optical Cavity Field

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