Positron trapping in a magnetic mirror configuration

Boehmer, H.; Adams, M.; Rynn, N.

doi:10.1063/1.871466

Cited by 102 publications

(62 citation statements)

References 10 publications

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“…Over the past few years, a number of experiments have been proposed to create EP plasmas (see, e.g., Refs. [6][7][8]. However, because of the fast annihilation and the formation of positronium atoms, the identification of collective modes in these EP plasmas may be practically impossible.…”

Section: Introductionmentioning

confidence: 99%

Elliptically polarized electromagnetic waves in a magnetized quantum electron-positron plasma with effects of exchange-correlation

Shahmansouri

Misra

2016

Physics of Plasmas

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The dispersion properties of elliptically polarized electromagnetic (EM) waves in a magnetized electronpositron-pair (EP-pair) plasma are studied with the effects of particle dispersion associated with the Bohm potential, the Fermi degenerate pressure, and the exchange-correlation force. Two possible modes of the extraordinary or X wave, modified by these quantum effects, are identified and their propagation characteristics are investigated numerically. It is shown that the upper-hybrid frequency, and the cutoff and resonance frequencies are no longer constants but are dispersive due to these quantum effects. It is found that the particle dispersion and the exchange-correlation force can have different dominating roles on each other depending on whether the X waves are of short or long wavelengths (in comparison with the Fermi Debye length). The present investigation should be useful for understanding the collective behaviors of EP plasma oscillations and the propagation of extraordinary waves in magnetized dense EP-pair plasmas.

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Section: Introductionmentioning

confidence: 99%

Elliptically polarized electromagnetic waves in a magnetized quantum electron-positron plasma with effects of exchange-correlation

Shahmansouri

Misra

2016

Physics of Plasmas

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“…Positrons have been trapped using resistive cooling of the positrons [9], by ramping the trap electrostatic potential [10], and in a magnetic-mirror configuration by electron cyclotron-resonance heating [11]. Recent experiments by Gabrielse and coworkers [8,12,13] have successfully trapped more than 106 positrons in a cryogenic trap in 1 hour through a method where positronium in a high Rydberg state created on the surface of the moderator is field-ionized in the trap.…”

Section: Introductionmentioning

confidence: 99%

A laser-cooled, high density positron plasma

Jelenković¹,

Newbury²,

Bollinger³

et al. 2002

AIP Conference Proceedings

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Abstract. We present results on trapping and cooling of positrons in a Penning trap. Up to a few thousand positrons are trapped and sympathetically cooled through Coulomb collisions (sympathetic cooling) with laser-cooled 9 Be+ ions. By imaging the 9Be+ laser-induced fluorescence, we observe centrifugal separation of the 9Be+ ions and the positrons, with the positrons coalescing into a column along the trap axis. This indicates the positrons have the same rotation frequency and comparable density (-4 x 109 cm-3 ) as the 9 Be+ ions, and places an upper limit of approximately 5 K on the positron temperature of motion parallel to the magnetic field. The measured positron lifetime is > 8 days in our room temperature vacuum of 10-8 Pa.

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“…It was planed to confine relativistic e-p plasmas in a magnetic mirror [9]. High energy positrons emitted from radio isotopes (RI) [10] and moderated positrons [11] were confined in a magnetic mirror. Low energy e-p plasmas have been also studied theoretically [12][13][14] and some experimental studies have been performed.…”

Section: Introductionmentioning

confidence: 99%