Density and geometry of single component plasmas

Speck, A.; Gabrielse, Gerald; Larochelle, P.; Sage, D. Le; Levitt, B.; Kolthammer, W. Steven; McConnell, Robert; Wrubel, Jonathan; Grzonka, D.; Oelert, W.; Sefzick, T.; Zhang, Z.; Comeau, D.; George, M. C.; Hessels, E. A.; Storry, C. H.; Weel, M.; Walz, J.

doi:10.1016/j.physletb.2007.03.054

Cited by 9 publications

(9 citation statements)

References 21 publications

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“…If the total charge is known, the radius, r p can then be obtained. This effect has been used to measure the plasma parameters of electron and positron plasmas (Amoretti et al, 2003a;Funakoshi et al, 2007;Oxley et al, 2004;Speck et al, 2007;Tinkle et al, 1994). Other experiments have also used the response to a tuned-circuit to independently measure the total charge in the trap (Amoretti et al, 2003b;Feng et al, 1996;Wineland and Dehmelt, 1975).…”

Section: Spheroidal Modesmentioning

confidence: 99%

“…18. This technique has been successfully used to measure the plasma temperature in a wide range of electron and positron plasmas (Amoretti et al, 2003b;Carraro et al, 2004;Higaki et al, 2002;Tinkle et al, 1994), including the positron plasmas tailored for the creation of low-energy antihydrogen atoms (Funakoshi et al, 2007;Speck et al, 2007). Kuroda et al (2014a) used measurements of the (1,0) and (3,0) modes to study equilibration of antiprotons with an electron plasma following capture.…”

Section: Spheroidal Modesmentioning

confidence: 99%

See 1 more Smart Citation

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: Spheroidal Modesmentioning

confidence: 99%

Section: Spheroidal Modesmentioning

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

“…For example, ATHENA focused heavily on their positron plasmas, with work including: the development of nondestructive temperature diagnostics [56], efficient positron accumulation [57], and spatial control [58]. Likewise, ATRAP studied the stacking [59] and adiabatic cooling [60] of antiprotons, along with the density and geometry of positron and antiproton plasmas [61].…”

Section: Gravitational Interaction Between Matter and Antimattermentioning

confidence: 99%

Detection of Trapped Antihydrogen

Hydomako

2013

Springer Theses

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The ALPHA experiment is an international effort to produce, trap, and perform precision spectroscopic measurements on antihydrogen (the bound state of a positron and an antiproton). Based at the Antiproton Decelerator (AD) facility at CERN, the ALPHA experiment has recently magnetically confined antihydrogen atoms for the first time. A crucial element in the observation of trapped antihydrogen is ALPHA's silicon vertexing detector. This detector contains sixty silicon modules arranged in three concentric layers, and is able to determine the three-dimensional location of the annihilation of an antihydrogen atom by reconstructing the trajectories of the produced annihilation products.This dissertation focuses mainly on the methods used to reconstruct the annihilation location. Specifically, the software algorithms used to identify and extrapolate charged particle tracks are presented along with the routines used to estimate the annihilation location from the convergence of the identified tracks. It is shown that these methods can determine the annihilation location with a spatial resolution between about 0.6 to 0.8 cm (depending on the coordinate being measured). Furthermore, a robust analysis to identify and reduce cosmic ray background events is described. The cosmic ray background can obscure the trapped antihydrogen signal, and its suppression leads to a significant increase in the annihilation detection sensitivity. The background suppression analysis involves examining the reconstructed detector event based on several selection criteria, including: the number of charged particle tracks, the radial vertex position, and a fit of a straight line to the event hit positions. By carefully optimizing these criteria, (99.54 ± 0.02)% of cosmic ray events are rejected, while (64.4 ± 0.1)% of antihydrogen annihilation events are retained. Finally, the experimental results demonstrating the first-ever magnetic confinement of antihydrogen atoms are presented. These results rely heavily on the silicon i detector, and as such, the role of the annihilation vertex reconstruction is emphasized.

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“…The density and geometry of antiprotons and positron plasmas in realistic trapping potentials are required to understand and optimize antihydrogen formation. For the first time we have been able to compare an aperture method and a quadrupole oscillation frequency method for characterizing such plasmas, using trapped electrons [5]. Both methods are used in a way that avoids the usual assumption that the plasmas are spheroidal.…”

Section: Recent Accomplishments Point the Way Forwardmentioning

confidence: 99%

The Production and Study of Antiprotons and Cold Antihydrogen

Gabrielse¹

2010

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The public reporting burden for this collection of 1nfotmetion is estimated to average 1 hour per response. including the time for reviewing 1nsnucuons, searching existing dlta sources. gathering and m aintaining the dala needed. and completing and reviewing the collection of information. Send comments regarding this burden •stimate or any other aspect of thts collectlon of information, including $Ugge.stions f· or reducmg the burden, to the Department of Defense, ExecU1ive Serviee-s and Communications Directorate (0704-0188). Respondents should be aware that notwithst anding a ny othef provision of law. no person shall be subject to any penafty for fading to comply with a collection of information if it does not display a currently vefid OMB To develop techniques required to produce and store atoms made entirely of anti-matter. Anti-matter provides high-density energy storage that far outstrips even nuclear materials. Potential applications for anti-matter include rocketry and explosives. In the last grant period, a new positron accumulator was developed Follow-up research is needed to develop the techniques to transfer the substantially increased number of positrons from the accumulator to the anti-hydrogen apparatus. In the last grant period, a new method for load ing electrons needed to cool antiprotons was de,veloped. This new method is more robust, faster, and easily controllable. Follow-up research is needed to test this new method with anti-protons. Also, the PI has proposed to try two different magnetic traps to trap the anti-hydrogen as it is formed. Finally, the goal of precision 1s-2s sp ectroscopy will be addressed via laser cooling of anti-hydrogen. ·. AFRL-OSR-VA-TR-2012-0170A. Project Summary and Statement of Objectives AFOSR support launched and continues to sustain this unique antimatter research study of antiprotons and antihydrogen, the annihilation of which produce the maximum energy per unit mass. The practical goal is to develop the unusual techniques required to produce and store atoms made entirely of antimatter, given that the slightest encounter with ordinary matter will cause them to turn all their mass into energy as they annihilate. The scientific goal, which gives this program a highly leveraged access to the world's unique and extremely limited supply of antiprotons, is to use laser spectroscopy to compare the properties of matter and antimatter atoms to extremely high precision -promising to be the highest precision test of the fundamental CPT theorem with leptons and baryons.The first observations of slow antihydrogen atoms several years ago were widely celebrated and reported, in venues ranging from the scientific Physical Review Letters, Nature, Science, and Physics Today, to the popular science reports in CNN, most major newspapers, and most other news outlets. The American Institute of Physics even selected the production and observation of cold antihydrogen as one of the two top physics stories of the year.Much progress has been made since. Most recently, during the nearly ...

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Density and geometry of single component plasmas

Cited by 9 publications

References 21 publications

Plasma and trap-based techniques for science with positrons

Plasma and trap-based techniques for science with positrons

Detection of Trapped Antihydrogen

The Production and Study of Antiprotons and Cold Antihydrogen

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