Positron trapping in a magnetic mirror configuration

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

doi:10.1016/s0169-4332(96)00968-3

Cited by 6 publications

(8 citation statements)

References 15 publications

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“…In the mirror, it is also beneficial to arrange T⊥ >> T⎢ ⎢, where T⊥ and T⎢ ⎢ are the perpendicular and parallel temperatures of the particles. Both conditions can be achieved relatively easily for electron-mass particles by heating at the cyclotron frequency using microwave radiation, and this is what was done in the experiment of reference 59 . The result was the confinement of ~ 10 4 positrons with confinement times of ~ 20 s and densities of ~ 5 x 10 8 m -3 .…”

Section: Electron-positron Plasmasmentioning

confidence: 89%

“…In this experiment, positrons were accumulated from a 0.6 mCi 22 Na source and polycrystalline tungsten moderator. 59 It turns out that confinement in a magnetic mirror is better when the plasma is hot (i.e., thereby reducing the loss due to Coulomb collisions). In the mirror, it is also beneficial to arrange T⊥ >> T⎢ ⎢, where T⊥ and T⎢ ⎢ are the perpendicular and parallel temperatures of the particles.…”

Section: Electron-positron Plasmasmentioning

confidence: 99%

“…Experimental arrangement to confine positrons in a magnetic mirror using a 22 Na source and moderator located in the mirror-field region. 59 In principle, such a configuration could be used to capture fast positrons from the source (i.e., eliminating the need for a moderator). Reprinted from reference 59 .…”

Section: Electron-positron Plasmasmentioning

confidence: 99%

“…59 In principle, such a configuration could be used to capture fast positrons from the source (i.e., eliminating the need for a moderator). Reprinted from reference 59 .…”

Section: Electron-positron Plasmasmentioning

confidence: 99%

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Chapter 5: Accumulation, Storage and Manipulation of Large Numbers of Positrons in Traps II — Selected Topics

Surko¹,

Danielson²,

Weber³

2014

Physics With Trapped Charged Particles

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This chapter describes research to create, manipulate and utilize positron, antimatter plasmas. One is the development of a method to extract cold beams with small transverse spatial extent from plasmas in a high-field Penning-Malmberg trap. Such beams can be created with energy spreads comparable to the temperature of the parent plasma and with transverse spatial diameters as small as four Debye screening lengths. Using tailored parent plasmas, this technique provides the ability to optimize the properties of the extracted positron beams. In another section, the design of a multicell positron trap is described that offers the possibility to accumulate and store orders of magnitude more positrons than is currently possible (e.g., particle numbers > 10 12). The device is scalable to even larger particle capacities. It would, for example, aid greatly in being able to multiplex the output of intense positron sources and in efforts to create and study electron-positron plasmas. This multicell trap (MCT) is likely to also be an important step in the development of portable traps for antimatter. The third topic is a discussion of possible ways to create and study electron-positron plasmas. They have a number of unique properties. These so-called a This chapter, with corrections and minor updates as noted, is reprinted with permission from

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Section: Electron-positron Plasmasmentioning

confidence: 89%

Section: Electron-positron Plasmasmentioning

confidence: 99%

Section: Electron-positron Plasmasmentioning

confidence: 99%

“…59 In principle, such a configuration could be used to capture fast positrons from the source (i.e., eliminating the need for a moderator). Reprinted from reference 59 .…”

Section: Electron-positron Plasmasmentioning

confidence: 99%

See 2 more Smart Citations

Chapter 5: Accumulation, Storage and Manipulation of Large Numbers of Positrons in Traps II — Selected Topics

Surko¹,

Danielson²,

Weber³

2014

Physics With Trapped Charged Particles

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“…They passed an electron beam through a positron plasma confined in a Penning–Malmberg trap and excited a two-stream instability. 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.…”

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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A new path toward gravity experiments with antihydrogen

Pérez

Rosowsky

2005

Nuclear Instruments and Methods in Physics Research Section A:

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We propose to use a 13 KeV antiproton beam passing through a dense cloud of positronium (Ps) atoms to produce an H + "beam". These ions can be slowed down and captured by a trap. The process involves two reactions with large cross sections under the same experimental conditions. These reactions are the interaction of p with P S to produce H and the e + capture by H reacting on P S to produce H +. Once decelerated with an electrostatic field and captured in a trap the H + ions could be cooled and the e + removed with a laser to perform a measurement of the gravitational acceleration of neutral antimatter in the gravity field of the Earth.

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Positron trapping in a magnetic mirror configuration

Cited by 6 publications

References 15 publications

Chapter 5: Accumulation, Storage and Manipulation of Large Numbers of Positrons in Traps II — Selected Topics

Chapter 5: Accumulation, Storage and Manipulation of Large Numbers of Positrons in Traps II — Selected Topics

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

A new path toward gravity experiments with antihydrogen

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