Simultaneous confinement of low-energy electrons and positrons in a compact magnetic mirror trap

Higaki, Hidehiko; Kaga, C.; Fukushima, Kei; Okamoto, Hiromi; Nagata, Y.; Kanai, Yasuyuki; Yamazaki, Y.

doi:10.1088/1367-2630/aa5a45

Cited by 31 publications

(20 citation statements)

References 43 publications

(49 reference statements)

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“…are pursuing this approach and have simultaneously trapped 10 electrons and 10 positrons for times as long as 70 ms, although the density was too low for collective effects to emerge (Higaki et al. 2017). As discussed in § 3, mirror confinement is also being developed to trap laser produced electron–positron plasmas.…”

Section: Magnetic Confinement Of Low-density Pair Plasmasmentioning

confidence: 99%

A new frontier in laboratory physics: magnetized electron–positron plasmas

et al. 2020

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We describe here efforts to create and study magnetized electron–positron pair plasmas, the existence of which in astrophysical environments is well-established. Laboratory incarnations of such systems are becoming ever more possible due to novel approaches and techniques in plasma, beam and laser physics. Traditional magnetized plasmas studied to date, both in nature and in the laboratory, exhibit a host of different wave types, many of which are generically unstable and evolve into turbulence or violent instabilities. This complexity and the instability of these waves stem to a large degree from the difference in mass between the positively and the negatively charged species: the ions and the electrons. The mass symmetry of pair plasmas, on the other hand, results in unique behaviour, a topic that has been intensively studied theoretically and numerically for decades, but experimental studies are still in the early stages of development. A levitated dipole device is now under construction to study magnetized low-energy, short-Debye-length electron–positron plasmas; this experiment, as well as a stellarator device that is in the planning stage, will be fuelled by a reactor-based positron source and make use of state-of-the-art positron cooling and storage techniques. Relativistic pair plasmas with very different parameters will be created using pair production resulting from intense laser–matter interactions and will be confined in a high-field mirror configuration. We highlight the differences between and similarities among these approaches, and discuss the unique physics insights that can be gained by these studies.

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Section: Magnetic Confinement Of Low-density Pair Plasmasmentioning

confidence: 99%

A new frontier in laboratory physics: magnetized electron–positron plasmas

et al. 2020

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“…single-component plasmas, a pair plasma, having charge carriers of both sign, cannot be stored in a single linear particle trap. Nesting traps for species of opposite sign has been successful [4], but leaves the species in separate spatial regions of the traps or at different temperature. One configuration that has the promise of storing a plasma at any degree of neutrality is the magnetic dipole field of a current loop freely floating in space.…”

Section: Introductionmentioning

confidence: 99%

Progress of the APEX experiment for creation of an electron-positron pair plasma

Hergenhahn

Horn-Stanja

Nißl

et al. 2018

AIP Conference Proceedings

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Electron-positron pair plasmas are an unexplored state of matter predicted to have properties intriguing for plasma physics as well as astrophysics. Here we described recent progress in the APEX collaboration dedicated to the production of a cold, confined electron-positron plasma in the laboratory. We focus on methods to inject positrons produced externally into a magnetic dipole trap, and to manipulate the ensuing trapped positron cloud. These experiments are carried out at the NEPOMUC positron beamline of the FRM II research reactor. Recent progress in producing more intense positron beams is briefly discussed.

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“…The importance of studying electron-positron plasmas has two aspects, one being the basic physics associated with simple nonlinear plasma systems and the other being the application of laboratory experiments as well as certain astrophysical environments. In particular, laboratory experiments on beam and plasma interactions in electron-positron plasmas have been performed by using cylindrical and quadrupole Penning traps [14] and high-intensity-laser-induced electron-positron jets [15]. Using the compact magnetic mirror trap, the simultaneous existence of low-energy (a few eV) electrons and positrons in the laboratory has been found to be possible [16].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas

Jao

Hau

2018

Phys. Rev. E

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Electron-positron plasmas may be present in laboratory experiments and certain astrophysical environments. Due to the inertia symmetry there have been some debates about whether the nonlinear electrostatic solitons generated easily in electron-proton plasmas may develop in electron-positron plasmas. In this study we show the formation of electrostatic solitons and electromagnetic Alfvén waves in extensive magnetized electron-positron plasma system generated by streaming instabilities based on electromagnetic particle simulations along with fluid theory analyses. In particular, the four-component beam-plasma system may lead to the formation of interlacing electron and positron solitons in the early evolution stage (say, t<20ω_{p}^{-1}, where ω_{p}^{} is the plasma frequency) and large-amplitude Alfvén waves in the later phase (say, t>150ω_{p}^{-1}). The magnetic-field perturbations are generated by the beam and firehose-type instabilities associated with temperature anisotropy of T_{∥}>T_{⊥} resulting from the parallel plasma heating by the electrostatic instability. It is shown that the growth rates and the dominant wavelengths of both electrostatic and electromagnetic instabilities are consistent with the fluid theory. The coexistence of electrostatic solitons and electromagnetic Alfvén waves with significant magnetic field fluctuations in the same system is a unique feature of electron-positron plasmas and the unified theory behind the formation mechanisms is well addressed in the paper.

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Simultaneous confinement of low-energy electrons and positrons in a compact magnetic mirror trap

Cited by 31 publications

References 43 publications

A new frontier in laboratory physics: magnetized electron–positron plasmas

A new frontier in laboratory physics: magnetized electron–positron plasmas

Progress of the APEX experiment for creation of an electron-positron pair plasma

Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas

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