Stable confinement of electron plasma and initial results on positron injection in RT-1

Saitoh, H.; Yoshida, Zensho; Morikawa, Junji; Yano, Yoshihisa; Kasaoka, N.; Sakamoto, Wataru; Nogami, T.

doi:10.1063/1.4796062

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…In order to experimentally demonstrate the chaotic long orbits of high-energy positrons in the dipole configuration, and also to verify the accuracy of the numerical calculations, we injected positrons into the dipole field of RT-1 using a 1-MBq (27-μCi) 22 Na source [39]. Here we report the results and compare them with numerical calculations.…”

Section: Positron Injection Into Rt-1mentioning

confidence: 92%

Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme

et al. 2016

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We study the behavior of high-energy positrons emitted from a radioactive source in a magnetospheric dipole field configuration. Because the conservation of the first and second adiabatic invariants is easily destroyed in a strongly inhomogeneous dipole field for high-energy charged particles, the positron orbits are nonintegrable, resulting in chaotic motions. In the geometry of a typical magnetospheric levitated dipole experiment, it is shown that a considerable ratio of positrons from a ^{22}Na source, located at the edge of the confinement region, has chaotic long orbit lengths before annihilation. These particles make multiple toroidal circulations and form a hollow toroidal positron cloud. Experiments with a small ^{22}Na source in the Ring Trap 1 (RT-1) device demonstrated the existence of such long-lived positrons in a dipole field. Such a chaotic behavior of high-energy particles is potentially applicable to the formation of a dense toroidal positron cloud in the strong-field region of the dipole field in future studies.

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Section: Positron Injection Into Rt-1mentioning

confidence: 92%

Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme

et al. 2016

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“…Levitation of the current loop is vital to avoid particle losses on the supporting structure. In previous experiments, confinement of conventional (electron-ion) plasmas [5,6] as well as pure electron plasmas [7] in the field of a levitated, superconducting ring conductor has been achieved.…”

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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Plasma and trap-based techniques for science with antimatter

Fajans

Surko

2020

Physics of Plasmas

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Positrons (i.e., antielectrons) find use in a wide variety of applications, and antiprotons are required for the formation and study of antihydrogen. Available sources of these antiparticles are relatively weak. To optimize their use, most applications require that the antiparticles be accumulated into carefully prepared plasmas. We present an overview of the techniques that have been developed to efficiently accumulate low energy antiparticles and create, in particular, tailored antiparticle plasmas. Techniques are also described to create tailored antiparticle beams. Many of these techniques are based on methods first developed by the nonneutral plasma community using electron plasmas for increased data rate. They have enabled the creation and trapping of antihydrogen, have been critical to studies of positron and positronium interactions with matter, including advanced techniques to characterize materials and material surfaces, and have led to the creation and study of the positronium molecule. Rather than attempting to be comprehensive, we focus on techniques that have proven most useful, applications where there has been significant, recent progress, and areas that hold promise for future advances. Examples of the latter include the ever more precise comparisons of the properties of antihydrogen and hydrogen, tests of gravity using antihydrogen and positronium atoms, and efforts to create and study phases of the many-electron, many-positron system.

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Stable confinement of electron plasma and initial results on positron injection in RT-1

Cited by 4 publications

References 18 publications

Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme

Chaos of energetic positron orbits in a dipole magnetic field and its potential application to a new injection scheme

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

Plasma and trap-based techniques for science with antimatter

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