Antihydrogen production and precision experiments

Holzscheiter, M. H.; Bendiscioli, G.; Bertin, A.; Bollen, G.; Bruschi, M.; Cesar, C. L.; Charlton, M.; Corradini, M.; Depedis, D.; Doser, M.; Eades, J.; Fedele, R.; Feng, Xu; Galluccio, F.; Goldman, T.; Hangst, J. S.; Hayano, R. S.; Horvath, D. G.; Hughes, Richard; King, N.S.P.; Kirsebom, K.; Knudsen, H.; Lagomarsino, V.; Landua, R.; Laricchia, G.; Lewis, R. A.; Lodi-Rizzini, E.; Macrı́, M.; Manuzio, G.; Marconi, U.; Masullo, M.R.; Merrison, J. P.; Møller, S.P.; Morgan, G. L.; Nieto, Michael Martin; Piccinini, M.; Poggiani, R.; Rotondi, A.; Rouleau, G.; Salvini, P.; Semprini‐Cesari, N.; Smith, Gerald A.; Surko, C. M.; Testera, G.; Torelli, G.; Uggerhøj, E.; Vaccaro, V.G.; Venturelli, L.; Vitale, A.; Widmann, E.; Yamazaki, T.; Yamazaki, Y.; Zanello, D.; Zoccoli, À.

doi:10.1016/s0920-5632(97)00296-x

Cited by 24 publications

(8 citation statements)

References 53 publications

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“…The electron source is located about 2 m away from the antiproton trap in a low-magnetic field zone (B "• 0.01 T). To reach the antiproton trap the electron beam passes through several grounded cylindrical electrodes composing the nested-well multi-ring trap that will be used for the recombination studies [1,2]. The typical source emitted current is about 200 #iA while the electron current that reaches the aluminum foil is less than 20 14A.…”

Section: Electron Plasma Loading and Confinementmentioning

confidence: 99%

Electron plasma for antiproton cooling in the ATHENA experiment

Amoretti¹,

Carraro²,

Lagomarsino³

et al. 2002

AIP Conference Proceedings

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Abstract. The first phase of the ATHENA (AnTiHydrogEN Apparatus) experiment is devoted to the study of cold antihydrogen production.The apparatus includes an antiproton capture trap designed to trap and to cool antiprotons coming from the CERN Antiproton Decelerator (AD). The antiproton cooling is achieved by means of the collisional interaction with a cold cloud of trapped electrons. The electron plasma is loaded in the trap before the antiproton capture by means of a small-size heated filament and cooled to sub-eV temperatures by cyclotron radiation.We report some measurements devoted to the characterization of the electron plasma. The ATHENA apparatus design does not allow the use of complex diagnostic; therefore the plasma properties are obtained using electrostatic wall probes, radio-frequency diagnostic, and dumping the electrons onto a charge collector. A simple experimental method to obtain an estimate of the electron plasma radius is discussed.

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Section: Electron Plasma Loading and Confinementmentioning

confidence: 99%

Electron plasma for antiproton cooling in the ATHENA experiment

Amoretti¹,

Carraro²,

Lagomarsino³

et al. 2002

AIP Conference Proceedings

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“…(λ = 243nm for the two-photon 1s − 2s transition.) It has been suggested that an even more accurate measurement of the line centre to ∼ 1mHz, corresponding to an ultimate resolution of one part in 10 18 , is in principle attainable [37,38]. The 1s − 2s transition is therefore favoured for precision spectroscopy.…”

Section: S − 2s and 2s − Nd (N ∼ 10) Transitions In H And Anti-hmentioning

confidence: 99%

“…In ref. [38], the possibility of achieving a width of 20kHz is envisaged. Reducing Zeeman broadening and developing techniques to determine the line centre to even higher accuracy in order to approach the theoretically limiting resolution of the 1s − 2s transition is therefore an important experimental challenge [42].…”

Section: S − 2s and 2s − Nd (N ∼ 10) Transitions In H And Anti-hmentioning

confidence: 99%

Strong equivalence, Lorentz and CPT violation, anti-hydrogen spectroscopy and gamma-ray burst polarimetry

Shore

2005

Nuclear Physics B

107

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The strong equivalence principle, local Lorentz invariance and CPT symmetry are fundamental ingredients of the quantum field theories used to describe elementary particle physics. Nevertheless, each may be violated by simple modifications to the dynamics while apparently preserving the essential fundamental structure of quantum field theory itself. In this paper, we analyse the construction of strong equivalence, Lorentz and CPT violating Lagrangians for QED and review and propose some experimental tests in the fields of astrophysical polarimetry and precision atomic spectroscopy. In particular, modifications of the Maxwell action predict a birefringent rotation of the direction of linearly polarised radiation from synchrotron emission which may be studied using radio galaxies or, potentially, gamma-ray bursts. In the Dirac sector, changes in atomic energy levels are predicted which may be probed in precision spectroscopy of hydrogen and anti-hydrogen atoms, notably in the Doppler-free, two-photon 1s − 2s and 2s − nd (n ∼ 10) transitions.

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“…A recent Theme, in issue 1755, is devoted to the collision physics of atoms, molecules and photons. In this, a scheduled experiment on antihydrogen is described by Laricchia & Charlton (1999) in their paper on collisions involving antiparticles: the ATHENA apparatus, taken from Holzscheiter et al . (1997) is illustrated in figure 3.…”

mentioning

confidence: 99%

“…Reproduced from vol. 357 of Philosophical Transactions of the Royal Society (seeLaricchia & Charlton 1999) afterHolzscheiter et al . (1997).…”

mentioning

confidence: 99%

Philosophical Transactions into the 21st Century: an editorial

Thompson

1999

Philosophical Transactions of the Royal Society of London. Seri

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It was a great pleasure for me to take over as the Editor of the Philosophical Transactions of the Royal Society (Series A: Mathematical, Physical and Engineering Sciences) in July 1998. The transition was made particularly smooth by the help and advice of the experienced outgoing Editor, Frank Smith, who is a friend and colleague at University College London, where he holds the Goldsmid chair in applied mathematics. Frank had been the Editor for nearly a decade in a period of much change and development, and his policy of concentrating on cross-disciplinary research and applications has helped to keep the journal at the leading edge of the physical sciences. I had already served on the Editorial Board for many years, and had organized five interdisciplinary Themes covering nonlinear dynamics, engineering vibrations, electronics, solid mechanics, and flight instabilities of aircraft. So I had been closely involved with the journal for many years, and had seen at first hand Frank's leadership and initiative.The Royal Society was founded in 1660 to promote the new or experimental philosophy, embodying the principles envisaged by Sir Francis Bacon. Henry Oldenburg was appointed as the first (joint) secretary to the Society, and on 27 March 1665 he published his correspondence with leading European scientists as the Philosophical Transactions. This has appeared continuously ever since, and has the prestige of being the world's longest running scientific journal. In its formative years, Isaac Newton published 17 papers in the journal. His first paper, 'New theory about light and colours', effectively served to launch his scientific career in 1672. In the following month, his new reflecting telescope was described, and the original drawing from the journal is reproduced in figure 1. † Subsequently, the famous brachistochrone problem, posed by Johann Bernoulli, was published anonymously by Newton in the issue of February 1697. In this way, Phil. Trans. played a vital role in the new spirit of enquiry that led to the blossoming of mathematical creativity in the latter part of the 17th century. This was crowned by the publication of Newton's Principia, which was reviewed anonymously by Halley in the journal in 1687. Under Newton's Presidency, from 1703 to his death in 1727, the reputation of the Society was firmly established among the scholars of Europe, and today it is the UK's academy of science, an independent organization promoting the natural and applied sciences.The original journal created by Oldenburg has branched and expanded over the years to give the four Royal Society journals of today. The physical sciences are served † 'An account of a new kind of catadioptrical telescope invented by Mr. Newton, Fellow of the R. Society, and Professor of Mathematiques in the University of Cambridge.'

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Antihydrogen production and precision experiments

Cited by 24 publications

References 53 publications

Electron plasma for antiproton cooling in the ATHENA experiment

Electron plasma for antiproton cooling in the ATHENA experiment

Strong equivalence, Lorentz and CPT violation, anti-hydrogen spectroscopy and gamma-ray burst polarimetry

Philosophical Transactions into the 21st Century: an editorial

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