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CERN Document Server Znaleziono 2,047 rekordów  1 - 10następnykoniec  skocz do rekordu: Szukanie trwało 0.93 sekund. 
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Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment / ALPHA Collaboration
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. [...]
arXiv:2211.09838.- 2023-04-03 - 15 p. - Published in : Phys. Rev. Accel. Beams 26 (2023) 040101 Fulltext: 2211.09838 - PDF; Publication - PDF;
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Silicon vertex detector upgrade in the ALPHA experiment / Amole, C (York U., Canada) ; Andresen, G.B (Aarhus U.) ; Ashkezari, M.D (Simon Fraser U.) ; Baquero-Ruiz, M (UC, Berkeley) ; Bertsche, W (Manchester U ; Cockcroft Inst. Accel. Sci. Tech.) ; Burrows, C (Swansea U.) ; Butler, E (CERN) ; Capra, A (York U., Canada) ; Cesar, C.L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) et al.
The Silicon Vertex Detector (SVD) is the main diagnostic tool in the ALPHA-experiment. It provides precise spatial and timing information of antiproton (antihydrogen) annihilation events (vertices), and most importantly, the SVD is capable of directly identifying and analysing single annihilation events, thereby forming the basis of ALPHA ' s analysis. [...]
2013 - 3 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 732 (2013) 134-136 Elsevier Open Access article: PDF;
In : 13th Vienna Conference on Instrumentation, Vienna, Austria, 11 - 15 Feb 2013, pp.134-136
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Limit on the electric charge of antihydrogen / Capra, A. (York U., Canada ; TRIUMF) ; Amole, C. (York U., Canada) ; Ashkezari, M.D. (Simon Fraser U.) ; Baquero-Ruiz, M. (UC, Berkeley) ; Bertsche, W. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E. (Imperial Coll., London ; CERN) ; Cesar, C.L. (Rio de Janeiro Federal U.) ; Charlton, M. (Swansea U.) ; Eriksson, S. (Swansea U.) ; Fajans, J. (UC, Berkeley ; LBL, Berkeley) et al.
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. [...]
arXiv:2107.08152.- 2016-12-20 - 7 p. - Published in : Hyperfine Interact. 238 (2017) 9 Fulltext: PDF;
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.9
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Enhanced Control and Reproducibility of Non-Neutral Plasmas / Ahmadi, M (Liverpool U.) ; Alves, B  X  R (Aarhus U.) ; Baker, C  J (Swansea U.) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Capra, A (TRIUMF) ; Carruth, C (UC, Berkeley) ; Cesar, C  L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Cohen, S (Ben Gurion U. of Negev) ; Collister, R (TRIUMF) et al. /ALPHA
The simultaneous control of the density and particle number of non-neutral plasmas confined in Penning-Malmberg traps is demonstrated. Control is achieved by setting the plasma’s density by applying a rotating electric field while simultaneously fixing its axial potential via evaporative cooling. [...]
2018 - 6 p. - Published in : Phys. Rev. Lett. 120 (2018) 025001
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5.
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Alpha Antihydrogen Experiment / ALPHA Collaboration
ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques..
arXiv:1104.4661.- 2010 - 5 p. - Published in : (2010) , pp. 50-54 Fulltext: PDF; External link: Preprint
In : 5th meeting on CPT and Lorentz symmetry, Bloomington, IN, USA, 28 Jun - 02 Jul 2010, pp.50-54
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6.
(65)
Measurements of Penning-Malmberg trap patch potentials and associated performance degradation / ALPHA Collaboration
Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. [...]
2024 - 8 p. - Published in : Phys. Rev. Res. 6 (2024) L012008 Fulltext: PDF;
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In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap / Amole, C. (York U., Canada) ; Ashkezari, M.D. (Simon Fraser U.) ; Baquero-Ruiz, M. (UC, Berkeley) ; Bertsche, W. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Butler, E. (CERN) ; Capra, A. (York U., Canada) ; Cesar, C.L. (Rio de Janeiro Federal U.) ; Charlton, M. (Swansea U.) ; Deller, A. (Swansea U.) ; Evetts, N. (British Columbia U.) et al.
We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. [...]
arXiv:1405.0692.- 2014-01-21 - 23 p. - Published in : New J. Phys. 16 (2014) 013037 Fulltext: njp_16_1_013037 - PDF; arXiv:1405.0692 - PDF; External link: Preprint
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8.
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Adiabatic expansion cooling of antihydrogen / ALPHA Collaboration
Magnetically trapped antihydrogen atoms can be cooled by expanding the volume of the trap in which they are confined. We report a proof-of-principle experiment in which antiatoms are deliberately released from expanded and static traps. [...]
2024 - 6 p. - Published in : Phys. Rev. Res. 6 (2024) L032065 Fulltext: PDF;
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Summit of the N=40 Island of Inversion: precision mass measurements and ab initio calculations of neutron-rich chromium isotopes / Silwal, R. (TRIUMF ; Appalachian State U.) ; Andreoiu, C. (Simon Fraser U.) ; Ashrafkhani, B. (Calgary U.) ; Bergmann, J. (Giessen U.) ; Brunner, T. (McGill U.) ; Cardona, J. (TRIUMF ; Manitoba U.) ; Dietrich, K. (TRIUMF ; Heidelberg U.) ; Dunling, E. (TRIUMF ; York U., England) ; Gwinner, G. (Manitoba U.) ; Hockenbery, Z. (TRIUMF ; McGill U.) et al.
Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the $Z = 20$ and $28$ proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron rich. [...]
arXiv:2204.09566.- 2022-10-10 - 12 p. - Published in : Phys. Lett. B 833 (2022) 137288 Fulltext: PDF;
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Investigation of the fine structure of antihydrogen / ALPHA Collaboration
At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fne structure of atomic hydrogen: a separation of the 2S$_{1/2}$ and 2P$_{1/2}$ states1. The observation of this separation, now known as the Lamb shift, marked an important event in the evolution of modern physics, inspiring others to develop the theory of quantum electrodynamics2–5. [...]
2020 - 10 p. - Published in : Nature 578 (2020) 375-380 Fulltext: PDF; External links: INTERACTIONS; Nature News and Views article
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