Nonneutral Electron Plasmas Confined in a Compact Magnetic Mirror Trap

Higaki, Hidehiko; Sakurai, Shota; Ito, K.; Okamoto, Hiromi

doi:10.1143/apex.5.106001

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…Boehmer et al (1995) employed a mirror device to confine moderated positrons from a 22 Na source. Recently, Higaki et al (2012) began systematic experiments to study single-component electron plasma confinement in the magnetic mirror device illustrated in Fig. 14.…”

Section: Traps For Long-term Confinementmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

225

222

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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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Section: Traps For Long-term Confinementmentioning

confidence: 99%

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

225

222

View full text Add to dashboard Cite

show abstract

“…The basic confinement properties of this compact magnetic mirror trap were tested with electrons and reported in ourprevious paper [33]. The confinement time (or the exponential decay time constant) t c was about 140 s for~10 8 electrons with a harmonic potential inside the magnetic mirror.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2017

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More than 10 7 electrons and 10 5 positrons withenergy less than a few eV were confined simultaneously for the first time in a compact magnetic mirror trap with plugging potentials. The exponential decay time constant of the confined positrons exceeded 70 ms at the beginning of the simultaneous confinement. Particle simulations in the early stages of the mixing process were also conducted. The results obtained in theexperiments and simulations suggested that an improved setup would make it possible to investigate the unexplored field of low-energy electron-positron plasmas experimentally.

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“…Pair plasma confinement in a magnetic mirror device is also being explored (Boehmer, Adams & Rynn 1995; Higaki et al. 2012), although this approach suffers from a loss-cone instability. Higaki et al.…”

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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Nonneutral Electron Plasmas Confined in a Compact Magnetic Mirror Trap

Cited by 7 publications

References 26 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

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

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

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