Positron Plasma in the Laboratory

Surko, C. M.; Leventhal, M.; Passner, A.

doi:10.1103/physrevlett.62.901

Cited by 346 publications

(213 citation statements)

References 10 publications

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“…(19) and (20) are displayed in Fig. 1, which shows the profiles of large-amplitude compressional electromagnetic solitary pulses for M = 1.2 and M = 1.5 and for different values of β.…”

Section: Profiles Of Solitary Pulsesmentioning

confidence: 99%

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Electromagnetic solitary pulses in a magnetized electron-positron plasma

2011

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A theory for large amplitude compressional electromagnetic solitary pulses in a magnetized electron-positron (e-p) plasma is presented. The pulses, which propagate perpendicular to the external magnetic field, are associated with the compression of the plasma density and the wave magnetic field. Here the solitary wave magnetic field pressure provides the restoring force, while the inertia comes from the equal mass electrons and positrons. The solitary pulses are formed due to a balance between the compressional wave dispersion arising from the curl of the inertial forces in Faradays law and the nonlinearities associated with the divergence of the electron and positron fluxes, the nonlinear Lorentz forces, the advection of the e-p fluids, and the nonlinear plasma current densities. The compressional solitary pulses can exist in a well-defined speed range above the Alfven speed. They can be associated with localized electromagnetic field excitations in magnetized laboratory and space plasmas composed of electrons and positrons.

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“…(19) and (20) are displayed in Fig. 1, which shows the profiles of large-amplitude compressional electromagnetic solitary pulses for M = 1.2 and M = 1.5 and for different values of β.…”

Section: Profiles Of Solitary Pulsesmentioning

confidence: 99%

“…Positrons have also been created in postdisruption plasmas in large tokamaks [18] through collisions between MeV electrons and thermal particles. The progress in the production of positron plasmas of the past two decades makes it possible to consider laboratory experiments on e-p plasmas [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic solitary pulses in a magnetized electron-positron plasma

2011

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“…[36]. Positrons from a solid-neon moderated [80] 22 Na source are captured in a two-stage Surko trap [81,82] operating at 1 Hz. The trap output (∼10 5 e + per cycle) is bunched [83] and magnetically guided through a 45 • turn into the Ps production region (see Fig.…”

Section: Methodsmentioning

confidence: 99%

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Swann¹,

Cassidy

Deller

et al. 2016

Phys. Rev. A

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Predicted twenty years ago, positron binding to neutral atoms has not yet been observed experimentally. A new scheme is proposed to detect positron-atom bound states by colliding Rydberg positronium (Ps) with neutral atoms. Estimates of the charge-transfer reaction cross section are obtained using the first Born approximation for a selection of neutral atom targets and a wide range of incident Ps energies and principal quantum numbers. We also estimate the corresponding Ps ionization cross section. The accuracy of the calculations is tested by comparison with earlier predictions for Ps charge transfer in collisions with hydrogen and antihydrogen. We describe an existing Rydberg Ps beam suitable for producing positron-atom bound states and estimate signal rates based on the calculated cross sections and realistic experimental parameters. We conclude that the proposed methodology is capable of producing such states and of testing theoretical predictions of their binding energies.

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“…A variety of techniques have been proposed or developed for trapping positrons, including trapping by collisions with a buffer gas [13], trapped ions [14] or trapped electrons [15], trapping by electronic damping [16], chaotic orbits and field ionization of Rydberg positronium atoms [ 17]. Of these, only the buffer gas technique has the efficiency to be usable for high throughput beam systems, although trapping using ions has the potential to achieve similar high efficiencies.…”

Section: Positron Trappingmentioning

confidence: 99%

The creation of high quality positron beams using traps

Greaves¹

2002

AIP Conference Proceedings

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Abstract. High quality positron beams are currently used for a variety of applications in science and technology. One of the most demanding applications is as analytical tools for surface and materials science, where ultra-short positron pulses (<200 ps) and microscopic beams (<1 micron in diameter) are desirable. Positron traps offer a qualitatively new method for beam formation and manipulation that has significant advantages in efficiency, flexibility, and cost over current beam conditioning techniques. One important capability is brightness enhancement by radial compression of the positron plasma using the rotating wall technique developed for electron and ion plasmas. A second capability is the production of ultra-short positron pulses required for positron annihilation lifetime spectroscopy. This can be accomplished using a trap by means of the simple technique of quadratic potential bunching, thus avoiding multiple stages of rf bunching currently used to produce pulsed positron beams.

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Positron Plasma in the Laboratory

Cited by 346 publications

References 10 publications

Electromagnetic solitary pulses in a magnetized electron-positron plasma

Electromagnetic solitary pulses in a magnetized electron-positron plasma

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

The creation of high quality positron beams using traps

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