CERN Accelerating science

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1.
Evaporative cooling of antiprotons and efforts to trap antihydrogen / Andresen, Gorm Bruun
Evaporative cooling has proven to be an invaluable technique in atomic physics, allowing for the study of effects such as Bose-Einstein condensation [...]
CERN-THESIS-2010-282 - 222 p.

Alpha - Fulltext - Full text
2.
Cold antihydrogen experiments and radial compression of antiproton clouds in the ALPHA apparatus at CERN / Gutierrez, A
Antihydrogen is the simplest neutral antimatter atom [...]
CERN-THESIS-2016-333. -


2429/56279
10.14288/1.0223173
Full text
3.
Low energy (anti)atoms for precision tests of basic physics / Silveira, D M ; Pereira, O ; Veloso, M ; Cesar, C L
Recent advances in techniques to manipulate and study, with high precision, atomic hydrogen, from one hand, and successful trapping schemes for positrons and antiprotons, from the other hand, have encouraged the pursuit of experiments to test CPT violation and the weak equivalence principle (WEP) through the comparison of hydrogen and antihydrogen. A description of the hydrogen trap and laser system being built in Rio, to trap and perform high resolution spectroscopy on cold hydrogen, is presented along with a discussion on the techniques and experimental system being implemented by the ATHENA collaboration at CERN to produce cold antihydrogen. [...]
2001
In : 21st Encontro Nacional de Fisica de Particulas e Campos : National Conferences on Physics of Particles and Fields, Sao Lourenco, Brazil, 23 - 27 Oct 2000, pp.203-10
4.
Trapped antihydrogen / ALPHA Collaboration
Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electromagnetic radiation. [...]
2012 - Published in : Hyperfine Interact. 212 (2012) 15-29
In : 10th international conference on the topic of Low Energy Antiproton Physics, TRIUMF, Vancouver, Canada, 27 Apr - 5 May 2011, pp.15-29
5.
Modeling of antihydrogen beam formation for interferometric gravity measurements / Gerber, Sebastian (CERN)
In this paper a detailed computational study is performed on the formation of antihydrogen via three-body-recombination of positrons and antiprotons in a Penning trap with a specific focus on formation of a beam of antihydrogen. First, an analytical model is presented to calculate the formation process of the anti-atoms, the yield of the fraction leaving the recombination plasma volume and their angular velocity distribution. [...]
2018 - 13 p. - Published in : J. Phys. B 51 (2018) 035008
6.
On the Possibility of Non-Neutral Antiproton Plasmas and Antiproton-Positron Plasmas / Higaki, H (Tsukuba U.)
Progresses in accumulating a large number of low energy antiprotons with Antiproton Decelerator (AD), Radio Frequency Quadrupole Decelerator (RFQD), and a multiring trap in Atomic Spectroscopy And Collisions Using Slow Antiprotons (ASACUSA) enables the confinement of more than 106 antiprotons. Confinement of a larger number of antiprotons in the trap will result in a non‐neutral antiproton plasma. [...]
2005 - Published in : AIP Conf. Proc. 793 (2005) 351-360
In : Conference on Physics with Ultra Slow Antiproton Beams, Wako, Japan, 14 - 16 Mar 2005, pp.351-360
7.
Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap / Amole, C (York U., Canada) ; Andresen, G B (Aarhus U.) ; Ashkezari, M D (Simon Fraser U.) ; Baquero-Ruiz, M (UC, Berkeley) ; Bertsche, W (Swansea U.) ; Butler, E (Swansea U. ; CERN) ; Cesar, C L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) ; Charlton, M (Swansea U.) ; Deller, A (Swansea U.) et al.
Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. [...]
arXiv:1201.3944.- 2012 - 35 p. - Published in : New J. Phys. 14 (2012) 105010 External link: Preprint
8.
Search For Trapped Antihydrogen / ALPHA Collaboration
We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental parameters. [...]
arXiv:1012.4110.- 2011 - 12 p. - Published in : Phys. Lett. B 695 (2011) 95-104 Fulltext: PDF; External link: Preprint
9.
Antihydrogen Trapped in the ALPHA Experiment / Bowe, Paul David (speaker) (Aarhus University)
In 2010 the ALPHA collaboration succeeded in trapping antihydrogen atoms for the first time.[i]  Stored antihydrogen promises to be a unique tool for making high precision measurements of the structure of this first anti-atom. Achieving this milestone presented several substantial experimental challenges and this talk will describe how they were overcome.   The unique design features of the ALPHA apparatus will be explained.[ii]  These allow a high intensity positron source and an antiproton imaging detector similar to the one used in the ATHENA[iii] experiment to be combined with an innovative magnet design of the anti-atom trap [...]
2011 - 3781. Detector Seminar External link: Event details In : Antihydrogen Trapped in the ALPHA Experiment
10.
Production of antihydrogen at reduced magnetic field for anti-atom trapping / ALPHA Collaboration
We have demonstrated production of antihydrogen in a 1$,$T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3$,$T) and ATRAP (5$,$T). [...]
arXiv:0807.0220.- 2008 - 5 p. - Published in : J. Phys. B 41 (2008) 011001 Fulltext: PDF; External link: Preprint

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