New Source of Dense, Cryogenic Positron Plasmas

Jørgensen, L. V.; Amoretti, M.; Bonomi, G.; Bowe, P. D.; Canali, C.; Carraro, C.; Cesar, C. L.; Charlton, M.; Doser, M.; Fontana, A.; Fujiwara, M.; Funakoshi, R.; Genova, P.; Hangst, J. S.; Hayano, R.; Kellerbauer, A.; Lagomarsino, V.; Landua, R.; Rizzini, E. Lodi; Macrı́, M.; Madsen, N.; Mitchard, D.; Montagna, P.; Rotondi, A.; Testera, G.; Variola, A.; Venturelli, L.; Werf, D. P. van der; Yamazaki, Y.

doi:10.1103/physrevlett.95.025002

Cited by 97 publications

(66 citation statements)

References 21 publications

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“…VIII, buffer gas traps are now employed in areas such as atomic and molecular physics (Gribakin et al, 2010), dense positronium states (Cassidy et al, 2005), antihydrogen formation (Comeau et al, 2012;Jørgensen et al, 2005) and materials science studies .…”

Section: Buffer Gas Trapsmentioning

confidence: 99%

“…However, if large numbers of positrons, or high throughput rates are required, it is generally preferable to use a BGT and isolate it from the experimental region using differential pumping techniques (Comeau et al, 2012;Jørgensen et al, 2005).…”

Section: Trapping In Uhvmentioning

confidence: 99%

“…If the magnetic fields in the two traps are different, then the adiabatic invariant ǫ ⊥ /B is relevant. In general this is not a problem [e.g., (Jørgensen et al, 2005;Young and Surko, 2006)], but when going from low magnetic fields to high, there is the possibility that the particles will be reflected if the particle transport energy isn't sufficiently large.…”

Section: Trap-to-trap Transfermentioning

confidence: 99%

“…This technique has proven to be a convenient way of extracting positrons from BGT's into UHV environments for antihydrogen production (Comeau et al, 2012;Jørgensen et al, 2005). It is also convenient for producing large positron accumulations from two-stage BGT's, e.g., for dense positronium experiments (Cassidy et al, 2006a).…”

Section: Trap-to-trap Transfermentioning

confidence: 99%

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Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

231

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: Buffer Gas Trapsmentioning

confidence: 99%

Section: Trapping In Uhvmentioning

confidence: 99%

Section: Trap-to-trap Transfermentioning

confidence: 99%

Section: Trap-to-trap Transfermentioning

confidence: 99%

See 2 more Smart Citations

Plasma and trap-based techniques for science with positrons

Danielson¹,

Dubin²,

Greaves³

et al. 2015

Rev. Mod. Phys.

231

222

View full text Add to dashboard Cite

show abstract

“…The essential steps leading to the production of H and the measurement of g with AEGIS are the following: The feasibility of the first two points has been conclusively demonstrated by the ATHENA and ATRAP collaborations (see, in particular, [17,18]). In the following, we will discuss the remaining aspects of the proposed technique in more detail.…”

Section: Introductionmentioning

confidence: 99%

Proposed antimatter gravity measurement with an antihydrogen beam

Kellerbauer

Amoretti²,

Белов³

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

Self Cite

250

175

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The principle of the equivalence of gravitational and inertial mass is one of the cornerstones of general relativity. Considerable efforts have been made and are still being made to verify its validity. A quantum-mechanical formulation of gravity allows for non-Newtonian contributions to the force which might lead to a difference in the gravitational force on matter and antimatter. While it is widely expected that the gravitational interaction of matter and of antimatter should be identical, this assertion has never been tested experimentally. With the production of large amounts of cold antihydrogen at the CERN Antiproton Decelerator, such a test with neutral antimatter atoms has now become feasible. For this purpose, we have proposed to set up the AEGIS experiment at 0168-583X/$ -see front matter Ó 2007 Published by Elsevier B.V.

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On the Chemical Reaction of Matter with Antimatter

2007

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A chemical reaction between the building block antiatomic nucleus, the antiproton (p or H- in chemical notation), and the hydrogen molecular ion (H2+) has been observed by the ATHENA collaboration at CERN. The charged pair interact via the long-range Coulomb force in the environment of a Penning trap which is purpose-built to observe antiproton interactions. The net result of the very low energy collision of the pair is the creation of an antiproton-proton bound state, known as protonium (Pn), together with the liberation of a hydrogen atom. The Pn is formed in a highly excited, metastable, state with a lifetime against annihilation of around 1 micros. Effects are observed related to the temperature of the H2+ prior to the interaction, and this is discussed herein.

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New Source of Dense, Cryogenic Positron Plasmas

Cited by 97 publications

References 21 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

Proposed antimatter gravity measurement with an antihydrogen beam

On the Chemical Reaction of Matter with Antimatter

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